Guides

Grid Types

MasonryInfiniteGrid

MasonryInfiniteGrid is a grid that stacks items with the same width as a stack of bricks. Adjust the width of all images to the same size, find the lowest height column, and insert a new item.

<div class="container"></div>

import { MasonryInfiniteGrid } from "@egjs/infinitegrid";

function getItems(nextGroupKey, count) {
  const nextItems = [];

  for (let i = 0; i < count; ++i) {
    const num = nextGroupKey * count + i;
    nextItems.push(`<div class="item">
  <div class="thumbnail">
      <img src="https://naver.github.io/egjs-infinitegrid/assets/image/${(num % 33) + 1}.jpg" alt="egjs" />
  </div>
  <div class="info">egjs ${num}</div>
</div>`);
  }
  return nextItems;
}
const ig = new MasonryInfiniteGrid(".container", {
  gap: 5,
});

ig.on("requestAppend", (e) => {
  const nextGroupKey = (+e.groupKey || 0) + 1;

  ig.append(getItems(nextGroupKey, 10), nextGroupKey);
});
ig.renderItems();

import * as React from "react";
import { MasonryInfiniteGrid } from "@egjs/react-infinitegrid";

function getItems(nextGroupKey: number, count: number) {
  const nextItems = [];
  const nextKey = nextGroupKey * count;

  for (let i = 0; i < count; ++i) {
    nextItems.push({ groupKey: nextGroupKey, key: nextKey + i });
  }
  return nextItems;
}

const Item = ({ num }: any) => <div className="item" style={{
  width: "250px",
}}>
  <div className="thumbnail">
    <img
      src={`https://naver.github.io/egjs-infinitegrid/assets/image/${(num % 33) + 1}.jpg`}
      alt="egjs" 
    />
  </div>
  <div className="info">{`egjs ${num}`}</div>
</div>;

export default function App() {
  const [items, setItems] = React.useState(() => getItems(0, 10));

  return <MasonryInfiniteGrid
    className="container"
    gap={5}
    onRequestAppend={(e) => {
      const nextGroupKey = (+e.groupKey! || 0) + 1;

      setItems([
        ...items,
        ...getItems(nextGroupKey, 10),
      ]);
    }}
  >
    {items.map((item) => <Item data-grid-groupkey={item.groupKey} key={item.key} num={item.key} />)}
  </MasonryInfiniteGrid>;
}

<template>
  <masonry-infinite-grid
    class="container"
    v-bind:gap="5"
    v-on:request-append="onRequestAppend"
  >
    <div
      class="item"
      v-for="item in items"
      :key="item.key"
      :data-grid-groupkey="item.groupKey"
    >
      <div class="thumbnail">
        <img
          v-bind:src="
            'https://naver.github.io/egjs-infinitegrid/assets/image/' +
            ((item.key % 33) + 1) +
            '.jpg'
          "
          alt="egjs" 
        />
      </div>
      <div class="info">egjs {{ item.key }}</div>
    </div>
  </masonry-infinite-grid>
</template>
<script lang="ts">
import { MasonryInfiniteGrid } from "@egjs/vue-infinitegrid";

export default {
  components: {
    MasonryInfiniteGrid,
  },
  data() {
    return {
      items: this.getItems(0, 10),
    };
  },
  methods: {
    getItems(nextGroupKey: number, count: number) {
      const nextItems: any[] = [];

      for (let i = 0; i < count; ++i) {
        const nextKey = nextGroupKey * count + i;

        nextItems.push({ groupKey: nextGroupKey, key: nextKey });
      }
      return nextItems;
    },
    onRequestAppend(e) {
      const nextGroupKey = (+e.groupKey! || 0) + 1;

      this.items = [...this.items, ...this.getItems(nextGroupKey, 10)];
    },
  },
};
</script>

<template>
  <masonry-infinite-grid
    class="container"
    v-bind:gap="5"
    v-on:request-append="onRequestAppend"
  >
    <div
      class="item"
      v-for="item in items"
      :key="item.key"
      :data-grid-groupkey="item.groupKey"
    >
      <div class="thumbnail">
        <img
          v-bind:src="
            'https://naver.github.io/egjs-infinitegrid/assets/image/' +
            ((item.key % 33) + 1) +
            '.jpg'
          "
          alt="egjs" 
        />
      </div>
      <div class="info">egjs {{ item.key }}</div>
    </div>
  </masonry-infinite-grid>
</template>
<script lang="ts">
import { MasonryInfiniteGrid } from "@egjs/vue3-infinitegrid";

export default {
  components: {
    MasonryInfiniteGrid,
  },
  data() {
    return {
      items: this.getItems(0, 10),
    };
  },
  methods: {
    getItems(nextGroupKey: number, count: number) {
      const nextItems: any[] = [];

      for (let i = 0; i < count; ++i) {
        const nextKey = nextGroupKey * count + i;

        nextItems.push({ groupKey: nextGroupKey, key: nextKey });
      }
      return nextItems;
    },
    onRequestAppend(e) {
      const nextGroupKey = (+e.groupKey! || 0) + 1;

      this.items = [...this.items, ...this.getItems(nextGroupKey, 10)];
    },
  },
};
</script>

<div NgxMasonryInfiniteGrid
  class="container"
  [gap]="5"
  [items]="items"
  [trackBy]="trackBy"
  [groupBy]="groupBy"
  (requestAppend)="onRequestAppend($event)"
  *ngFor="let item of [0]; trackBy: randomTrackBy;"
  #ig
  >
  <div class="item" *ngFor ="let item of ig.visibleItems; trackBy: trackBy;">
    <div class="thumbnail">
        <img [src]="'https://naver.github.io/egjs-infinitegrid/assets/image/' + (item.data.key % 33 + 1) + '.jpg'" alt="egjs" />
    </div>
    <div class="info">egjs {{item.data.key}}</div>
  </div>
</div>

import { Component, Input } from '@angular/core';
import { OnRequestAppend } from '@egjs/infinitegrid';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
})
export class AppComponent {
  items = this.getItems(0, 10);
  getItems(nextGroupKey: number, count: number) {
    const nextItems = [];
    const nextKey = nextGroupKey * count;

    for (let i = 0; i < count; ++i) {
      nextItems.push({ groupKey: nextGroupKey, key: nextKey + i });
    }
    return nextItems;
  }
  groupBy(_: any, item: any) {
    return item.groupKey;
  }
  trackBy(_: any, item: any) {
    return item.key;
  }
  onRequestAppend(e: OnRequestAppend) {
    const nextGroupKey = (+e.groupKey! || 0) + 1;

    this.items = [
      ...this.items,
      ...this.getItems(nextGroupKey, 10),
    ];
  }
}

<script>
  import { MasonryInfiniteGrid } from "@egjs/svelte-infinitegrid";

  let items = getItems(0, 10);

  function getItems(nextGroupKey, count) {
    const nextItems = [];

    for (let i = 0; i < count; ++i) {
      const nextKey = nextGroupKey * count + i;

      nextItems.push({ groupKey: nextGroupKey, key: nextKey });
    }
    return nextItems;
  }
</script>

<MasonryInfiniteGrid
  class="container"
  gap={5}
  {items}
  on:requestAppend={({ detail: e }) => {
    const nextGroupKey = (+e.groupKey || 0) + 1;

    items = [...items, ...getItems(nextGroupKey, 10)];
  }}
  let:visibleItems
>
  {#each visibleItems as item (item.key)}
    <div class="item">
      <div class="thumbnail">
        <img
          src={`https://naver.github.io/egjs-infinitegrid/assets/image/${
            (item.key % 33) + 1
          }.jpg`}
          alt="egjs" 
        />
      </div>
      <div class="info">{`egjs ${item.key}`}</div>
    </div>
  {/each}
</MasonryInfiniteGrid>

JustifiedInfiniteGrid

'justified' is a printing term with the meaning that 'it fits in one row wide'. JustifiedGrid is a grid that the item is filled up on the basis of a line given a size.

If 'data-grid-inline-offset' or 'data-grid-content-offset' are set for item element, the ratio is maintained except for the offset value.
If 'data-grid-maintained-target' is set for an element whose ratio is to be maintained, the item is rendered while maintaining the ratio of the element.

<div class="container"></div>

import { JustifiedInfiniteGrid } from "@egjs/infinitegrid";

function getItems(nextGroupKey, count) {
  const nextItems = [];

  for (let i = 0; i < count; ++i) {
    const num = nextGroupKey * count + i;
    nextItems.push(`<div class="item">
  <div class="thumbnail">
      <img src="https://naver.github.io/egjs-infinitegrid/assets/image/${(num % 33) + 1}.jpg" alt="egjs" data-grid-maintained-target="true"/>
  </div>
  <div class="info">egjs ${num}</div>
</div>`);
  }
  return nextItems;
}
const ig = new JustifiedInfiniteGrid(".container", {
  gap: 5,
});

ig.on("requestAppend", (e) => {
  const nextGroupKey = (+e.groupKey || 0) + 1;

  ig.append(getItems(nextGroupKey, 10), nextGroupKey);
});
ig.renderItems();

import * as React from "react";
import { JustifiedInfiniteGrid } from "@egjs/react-infinitegrid";

function getItems(nextGroupKey: number, count: number) {
  const nextItems = [];
  const nextKey = nextGroupKey * count;

  for (let i = 0; i < count; ++i) {
    nextItems.push({ groupKey: nextGroupKey, key: nextKey + i });
  }
  return nextItems;
}

const Item = ({ num }: any) => <div className="item" style={{
  width: "250px",
}}>
  <div className="thumbnail">
    <img
      src={`https://naver.github.io/egjs-infinitegrid/assets/image/${(num % 33) + 1}.jpg`}
      alt="egjs" data-grid-maintained-target="true"
    />
  </div>
  <div className="info">{`egjs ${num}`}</div>
</div>;

export default function App() {
  const [items, setItems] = React.useState(() => getItems(0, 10));

  return <JustifiedInfiniteGrid
    className="container"
    gap={5}
    onRequestAppend={(e) => {
      const nextGroupKey = (+e.groupKey! || 0) + 1;

      setItems([
        ...items,
        ...getItems(nextGroupKey, 10),
      ]);
    }}
  >
    {items.map((item) => <Item data-grid-groupkey={item.groupKey} key={item.key} num={item.key} />)}
  </JustifiedInfiniteGrid>;
}

<template>
  <justified-infinite-grid
    class="container"
    v-bind:gap="5"
    v-on:request-append="onRequestAppend"
  >
    <div
      class="item"
      v-for="item in items"
      :key="item.key"
      :data-grid-groupkey="item.groupKey"
    >
      <div class="thumbnail">
        <img
          v-bind:src="
            'https://naver.github.io/egjs-infinitegrid/assets/image/' +
            ((item.key % 33) + 1) +
            '.jpg'
          "
          alt="egjs" data-grid-maintained-target="true"
        />
      </div>
      <div class="info">egjs {{ item.key }}</div>
    </div>
  </justified-infinite-grid>
</template>
<script lang="ts">
import { JustifiedInfiniteGrid } from "@egjs/vue-infinitegrid";

export default {
  components: {
    JustifiedInfiniteGrid,
  },
  data() {
    return {
      items: this.getItems(0, 10),
    };
  },
  methods: {
    getItems(nextGroupKey: number, count: number) {
      const nextItems: any[] = [];

      for (let i = 0; i < count; ++i) {
        const nextKey = nextGroupKey * count + i;

        nextItems.push({ groupKey: nextGroupKey, key: nextKey });
      }
      return nextItems;
    },
    onRequestAppend(e) {
      const nextGroupKey = (+e.groupKey! || 0) + 1;

      this.items = [...this.items, ...this.getItems(nextGroupKey, 10)];
    },
  },
};
</script>

<template>
  <justified-infinite-grid
    class="container"
    v-bind:gap="5"
    v-on:request-append="onRequestAppend"
  >
    <div
      class="item"
      v-for="item in items"
      :key="item.key"
      :data-grid-groupkey="item.groupKey"
    >
      <div class="thumbnail">
        <img
          v-bind:src="
            'https://naver.github.io/egjs-infinitegrid/assets/image/' +
            ((item.key % 33) + 1) +
            '.jpg'
          "
          alt="egjs" data-grid-maintained-target="true"
        />
      </div>
      <div class="info">egjs {{ item.key }}</div>
    </div>
  </justified-infinite-grid>
</template>
<script lang="ts">
import { JustifiedInfiniteGrid } from "@egjs/vue3-infinitegrid";

export default {
  components: {
    JustifiedInfiniteGrid,
  },
  data() {
    return {
      items: this.getItems(0, 10),
    };
  },
  methods: {
    getItems(nextGroupKey: number, count: number) {
      const nextItems: any[] = [];

      for (let i = 0; i < count; ++i) {
        const nextKey = nextGroupKey * count + i;

        nextItems.push({ groupKey: nextGroupKey, key: nextKey });
      }
      return nextItems;
    },
    onRequestAppend(e) {
      const nextGroupKey = (+e.groupKey! || 0) + 1;

      this.items = [...this.items, ...this.getItems(nextGroupKey, 10)];
    },
  },
};
</script>

<div NgxJustifiedInfiniteGrid
  class="container"
  [gap]="5"
  [items]="items"
  [trackBy]="trackBy"
  [groupBy]="groupBy"
  (requestAppend)="onRequestAppend($event)"
  *ngFor="let item of [0]; trackBy: randomTrackBy;"
  #ig
  >
  <div class="item" *ngFor ="let item of ig.visibleItems; trackBy: trackBy;">
    <div class="thumbnail">
        <img [src]="'https://naver.github.io/egjs-infinitegrid/assets/image/' + (item.data.key % 33 + 1) + '.jpg'" alt="egjs" data-grid-maintained-target="true"/>
    </div>
    <div class="info">egjs {{item.data.key}}</div>
  </div>
</div>

import { Component, Input } from '@angular/core';
import { OnRequestAppend } from '@egjs/infinitegrid';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
})
export class AppComponent {
  items = this.getItems(0, 10);
  getItems(nextGroupKey: number, count: number) {
    const nextItems = [];
    const nextKey = nextGroupKey * count;

    for (let i = 0; i < count; ++i) {
      nextItems.push({ groupKey: nextGroupKey, key: nextKey + i });
    }
    return nextItems;
  }
  groupBy(_: any, item: any) {
    return item.groupKey;
  }
  trackBy(_: any, item: any) {
    return item.key;
  }
  onRequestAppend(e: OnRequestAppend) {
    const nextGroupKey = (+e.groupKey! || 0) + 1;

    this.items = [
      ...this.items,
      ...this.getItems(nextGroupKey, 10),
    ];
  }
}

<script>
  import { JustifiedInfiniteGrid } from "@egjs/svelte-infinitegrid";

  let items = getItems(0, 10);

  function getItems(nextGroupKey, count) {
    const nextItems = [];

    for (let i = 0; i < count; ++i) {
      const nextKey = nextGroupKey * count + i;

      nextItems.push({ groupKey: nextGroupKey, key: nextKey });
    }
    return nextItems;
  }
</script>

<JustifiedInfiniteGrid
  class="container"
  gap={5}
  {items}
  on:requestAppend={({ detail: e }) => {
    const nextGroupKey = (+e.groupKey || 0) + 1;

    items = [...items, ...getItems(nextGroupKey, 10)];
  }}
  let:visibleItems
>
  {#each visibleItems as item (item.key)}
    <div class="item">
      <div class="thumbnail">
        <img
          src={`https://naver.github.io/egjs-infinitegrid/assets/image/${
            (item.key % 33) + 1
          }.jpg`}
          alt="egjs" data-grid-maintained-target="true"
        />
      </div>
      <div class="info">{`egjs ${item.key}`}</div>
    </div>
  {/each}
</JustifiedInfiniteGrid>

JustifiedInfiniteGrid (Stretch)

stretch is possible to basically break the proportion of the item and stretch the inline size to fill the container. If you set the sizeRange range narrowly, you can stretch well.

stretchRange: If -, +, or % are added as a string value, it is a relative value to the original size. If it is a number value, the stretch range can be set as an absolute value. If data-grid-min-stretch and data-grid-max-stretch are set in the Element or JSX of each item, they will be applied first.
passUnstretchRow: Items placed in the last row are not stretched and are drawn maintaining their proportions. When using InfiniteGrid, it is calculated and re-rendered as follows:

<div class="container"></div>

import { JustifiedInfiniteGrid } from "@egjs/infinitegrid";

function getItems(nextGroupKey, count) {
  const nextItems = [];

  for (let i = 0; i < count; ++i) {
    const num = nextGroupKey * count + i;
    nextItems.push(`<div class="item">
  <div class="thumbnail">
      <img src="https://naver.github.io/egjs-infinitegrid/assets/image/${(num % 33) + 1}.jpg" alt="egjs" />
  </div>
  <div class="info">egjs ${num}</div>
</div>`);
  }
  return nextItems;
}
const ig = new JustifiedInfiniteGrid(".container", {
  gap: 5,
  stretch: true,
  passUnstretchRow: true,
  sizeRange: [228,228],
  stretchRange: [144,320],
});

ig.on("requestAppend", (e) => {
  const nextGroupKey = (+e.groupKey || 0) + 1;

  ig.append(getItems(nextGroupKey, 10), nextGroupKey);
});
ig.renderItems();

import * as React from "react";
import { JustifiedInfiniteGrid } from "@egjs/react-infinitegrid";

function getItems(nextGroupKey: number, count: number) {
  const nextItems = [];
  const nextKey = nextGroupKey * count;

  for (let i = 0; i < count; ++i) {
    nextItems.push({ groupKey: nextGroupKey, key: nextKey + i });
  }
  return nextItems;
}

const Item = ({ num }: any) => <div className="item" style={{
  width: "250px",
}}>
  <div className="thumbnail">
    <img
      src={`https://naver.github.io/egjs-infinitegrid/assets/image/${(num % 33) + 1}.jpg`}
      alt="egjs" 
    />
  </div>
  <div className="info">{`egjs ${num}`}</div>
</div>;

export default function App() {
  const [items, setItems] = React.useState(() => getItems(0, 10));

  return <JustifiedInfiniteGrid
    className="container"
    gap={5}
    stretch={true}
    passUnstretchRow={true}
    sizeRange={[228,228]}
    stretchRange={[144,320]}
    onRequestAppend={(e) => {
      const nextGroupKey = (+e.groupKey! || 0) + 1;

      setItems([
        ...items,
        ...getItems(nextGroupKey, 10),
      ]);
    }}
  >
    {items.map((item) => <Item data-grid-groupkey={item.groupKey} key={item.key} num={item.key} />)}
  </JustifiedInfiniteGrid>;
}

<template>
  <justified-infinite-grid
    class="container"
    v-bind:gap="5"
    v-bind:stretch="true"
    v-bind:passUnstretchRow="true"
    v-bind:sizeRange="[228,228]"
    v-bind:stretchRange="[144,320]"
    v-on:request-append="onRequestAppend"
  >
    <div
      class="item"
      v-for="item in items"
      :key="item.key"
      :data-grid-groupkey="item.groupKey"
    >
      <div class="thumbnail">
        <img
          v-bind:src="
            'https://naver.github.io/egjs-infinitegrid/assets/image/' +
            ((item.key % 33) + 1) +
            '.jpg'
          "
          alt="egjs" 
        />
      </div>
      <div class="info">egjs {{ item.key }}</div>
    </div>
  </justified-infinite-grid>
</template>
<script lang="ts">
import { JustifiedInfiniteGrid } from "@egjs/vue-infinitegrid";

export default {
  components: {
    JustifiedInfiniteGrid,
  },
  data() {
    return {
      items: this.getItems(0, 10),
    };
  },
  methods: {
    getItems(nextGroupKey: number, count: number) {
      const nextItems: any[] = [];

      for (let i = 0; i < count; ++i) {
        const nextKey = nextGroupKey * count + i;

        nextItems.push({ groupKey: nextGroupKey, key: nextKey });
      }
      return nextItems;
    },
    onRequestAppend(e) {
      const nextGroupKey = (+e.groupKey! || 0) + 1;

      this.items = [...this.items, ...this.getItems(nextGroupKey, 10)];
    },
  },
};
</script>

<template>
  <justified-infinite-grid
    class="container"
    v-bind:gap="5"
    v-bind:stretch="true"
    v-bind:passUnstretchRow="true"
    v-bind:sizeRange="[228,228]"
    v-bind:stretchRange="[144,320]"
    v-on:request-append="onRequestAppend"
  >
    <div
      class="item"
      v-for="item in items"
      :key="item.key"
      :data-grid-groupkey="item.groupKey"
    >
      <div class="thumbnail">
        <img
          v-bind:src="
            'https://naver.github.io/egjs-infinitegrid/assets/image/' +
            ((item.key % 33) + 1) +
            '.jpg'
          "
          alt="egjs" 
        />
      </div>
      <div class="info">egjs {{ item.key }}</div>
    </div>
  </justified-infinite-grid>
</template>
<script lang="ts">
import { JustifiedInfiniteGrid } from "@egjs/vue3-infinitegrid";

export default {
  components: {
    JustifiedInfiniteGrid,
  },
  data() {
    return {
      items: this.getItems(0, 10),
    };
  },
  methods: {
    getItems(nextGroupKey: number, count: number) {
      const nextItems: any[] = [];

      for (let i = 0; i < count; ++i) {
        const nextKey = nextGroupKey * count + i;

        nextItems.push({ groupKey: nextGroupKey, key: nextKey });
      }
      return nextItems;
    },
    onRequestAppend(e) {
      const nextGroupKey = (+e.groupKey! || 0) + 1;

      this.items = [...this.items, ...this.getItems(nextGroupKey, 10)];
    },
  },
};
</script>

<div NgxJustifiedInfiniteGrid
  class="container"
  [gap]="5"
  [stretch]="true"
  [passUnstretchRow]="true"
  [sizeRange]="[228,228]"
  [stretchRange]="[144,320]"
  [items]="items"
  [trackBy]="trackBy"
  [groupBy]="groupBy"
  (requestAppend)="onRequestAppend($event)"
  *ngFor="let item of [0]; trackBy: randomTrackBy;"
  #ig
  >
  <div class="item" *ngFor ="let item of ig.visibleItems; trackBy: trackBy;">
    <div class="thumbnail">
        <img [src]="'https://naver.github.io/egjs-infinitegrid/assets/image/' + (item.data.key % 33 + 1) + '.jpg'" alt="egjs" />
    </div>
    <div class="info">egjs {{item.data.key}}</div>
  </div>
</div>

import { Component, Input } from '@angular/core';
import { OnRequestAppend } from '@egjs/infinitegrid';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
})
export class AppComponent {
  items = this.getItems(0, 10);
  getItems(nextGroupKey: number, count: number) {
    const nextItems = [];
    const nextKey = nextGroupKey * count;

    for (let i = 0; i < count; ++i) {
      nextItems.push({ groupKey: nextGroupKey, key: nextKey + i });
    }
    return nextItems;
  }
  groupBy(_: any, item: any) {
    return item.groupKey;
  }
  trackBy(_: any, item: any) {
    return item.key;
  }
  onRequestAppend(e: OnRequestAppend) {
    const nextGroupKey = (+e.groupKey! || 0) + 1;

    this.items = [
      ...this.items,
      ...this.getItems(nextGroupKey, 10),
    ];
  }
}

<script>
  import { JustifiedInfiniteGrid } from "@egjs/svelte-infinitegrid";

  let items = getItems(0, 10);

  function getItems(nextGroupKey, count) {
    const nextItems = [];

    for (let i = 0; i < count; ++i) {
      const nextKey = nextGroupKey * count + i;

      nextItems.push({ groupKey: nextGroupKey, key: nextKey });
    }
    return nextItems;
  }
</script>

<JustifiedInfiniteGrid
  class="container"
  gap={5}
  stretch={true}
  passUnstretchRow={true}
  sizeRange={[228,228]}
  stretchRange={[144,320]}
  {items}
  on:requestAppend={({ detail: e }) => {
    const nextGroupKey = (+e.groupKey || 0) + 1;

    items = [...items, ...getItems(nextGroupKey, 10)];
  }}
  let:visibleItems
>
  {#each visibleItems as item (item.key)}
    <div class="item">
      <div class="thumbnail">
        <img
          src={`https://naver.github.io/egjs-infinitegrid/assets/image/${
            (item.key % 33) + 1
          }.jpg`}
          alt="egjs" 
        />
      </div>
      <div class="info">{`egjs ${item.key}`}</div>
    </div>
  {/each}
</JustifiedInfiniteGrid>

FrameInfiniteGrid

'Frame' is a printing term with the meaning that 'it fits in one row wide'. FrameGrid is a grid that the item is filled up on the basis of a line given a size.

<div class="container"></div>

import { FrameInfiniteGrid } from "@egjs/infinitegrid";

function getItems(nextGroupKey, count) {
  const nextItems = [];

  for (let i = 0; i < count; ++i) {
    const num = nextGroupKey * count + i;
    nextItems.push(`<div class="item">
  <div class="thumbnail">
      <img src="https://naver.github.io/egjs-infinitegrid/assets/image/${(num % 33) + 1}.jpg" alt="egjs" />
  </div>
  <div class="info">egjs ${num}</div>
</div>`);
  }
  return nextItems;
}
const ig = new FrameInfiniteGrid(".container", {
  gap: 5,
  frame: [[1,1,2,3,3],[1,1,4,4,5]],
});

ig.on("requestAppend", (e) => {
  const nextGroupKey = (+e.groupKey || 0) + 1;

  ig.append(getItems(nextGroupKey, 10), nextGroupKey);
});
ig.renderItems();

import * as React from "react";
import { FrameInfiniteGrid } from "@egjs/react-infinitegrid";

function getItems(nextGroupKey: number, count: number) {
  const nextItems = [];
  const nextKey = nextGroupKey * count;

  for (let i = 0; i < count; ++i) {
    nextItems.push({ groupKey: nextGroupKey, key: nextKey + i });
  }
  return nextItems;
}

const Item = ({ num }: any) => <div className="item" style={{
  width: "250px",
}}>
  <div className="thumbnail">
    <img
      src={`https://naver.github.io/egjs-infinitegrid/assets/image/${(num % 33) + 1}.jpg`}
      alt="egjs" 
    />
  </div>
  <div className="info">{`egjs ${num}`}</div>
</div>;

export default function App() {
  const [items, setItems] = React.useState(() => getItems(0, 10));

  return <FrameInfiniteGrid
    className="container"
    gap={5}
    frame={[[1,1,2,3,3],[1,1,4,4,5]]}
    onRequestAppend={(e) => {
      const nextGroupKey = (+e.groupKey! || 0) + 1;

      setItems([
        ...items,
        ...getItems(nextGroupKey, 10),
      ]);
    }}
  >
    {items.map((item) => <Item data-grid-groupkey={item.groupKey} key={item.key} num={item.key} />)}
  </FrameInfiniteGrid>;
}

<template>
  <frame-infinite-grid
    class="container"
    v-bind:gap="5"
    v-bind:frame="[[1,1,2,3,3],[1,1,4,4,5]]"
    v-on:request-append="onRequestAppend"
  >
    <div
      class="item"
      v-for="item in items"
      :key="item.key"
      :data-grid-groupkey="item.groupKey"
    >
      <div class="thumbnail">
        <img
          v-bind:src="
            'https://naver.github.io/egjs-infinitegrid/assets/image/' +
            ((item.key % 33) + 1) +
            '.jpg'
          "
          alt="egjs" 
        />
      </div>
      <div class="info">egjs {{ item.key }}</div>
    </div>
  </frame-infinite-grid>
</template>
<script lang="ts">
import { FrameInfiniteGrid } from "@egjs/vue-infinitegrid";

export default {
  components: {
    FrameInfiniteGrid,
  },
  data() {
    return {
      items: this.getItems(0, 10),
    };
  },
  methods: {
    getItems(nextGroupKey: number, count: number) {
      const nextItems: any[] = [];

      for (let i = 0; i < count; ++i) {
        const nextKey = nextGroupKey * count + i;

        nextItems.push({ groupKey: nextGroupKey, key: nextKey });
      }
      return nextItems;
    },
    onRequestAppend(e) {
      const nextGroupKey = (+e.groupKey! || 0) + 1;

      this.items = [...this.items, ...this.getItems(nextGroupKey, 10)];
    },
  },
};
</script>

<template>
  <frame-infinite-grid
    class="container"
    v-bind:gap="5"
    v-bind:frame="[[1,1,2,3,3],[1,1,4,4,5]]"
    v-on:request-append="onRequestAppend"
  >
    <div
      class="item"
      v-for="item in items"
      :key="item.key"
      :data-grid-groupkey="item.groupKey"
    >
      <div class="thumbnail">
        <img
          v-bind:src="
            'https://naver.github.io/egjs-infinitegrid/assets/image/' +
            ((item.key % 33) + 1) +
            '.jpg'
          "
          alt="egjs" 
        />
      </div>
      <div class="info">egjs {{ item.key }}</div>
    </div>
  </frame-infinite-grid>
</template>
<script lang="ts">
import { FrameInfiniteGrid } from "@egjs/vue3-infinitegrid";

export default {
  components: {
    FrameInfiniteGrid,
  },
  data() {
    return {
      items: this.getItems(0, 10),
    };
  },
  methods: {
    getItems(nextGroupKey: number, count: number) {
      const nextItems: any[] = [];

      for (let i = 0; i < count; ++i) {
        const nextKey = nextGroupKey * count + i;

        nextItems.push({ groupKey: nextGroupKey, key: nextKey });
      }
      return nextItems;
    },
    onRequestAppend(e) {
      const nextGroupKey = (+e.groupKey! || 0) + 1;

      this.items = [...this.items, ...this.getItems(nextGroupKey, 10)];
    },
  },
};
</script>

<div NgxFrameInfiniteGrid
  class="container"
  [gap]="5"
  [frame]="[[1,1,2,3,3],[1,1,4,4,5]]"
  [items]="items"
  [trackBy]="trackBy"
  [groupBy]="groupBy"
  (requestAppend)="onRequestAppend($event)"
  *ngFor="let item of [0]; trackBy: randomTrackBy;"
  #ig
  >
  <div class="item" *ngFor ="let item of ig.visibleItems; trackBy: trackBy;">
    <div class="thumbnail">
        <img [src]="'https://naver.github.io/egjs-infinitegrid/assets/image/' + (item.data.key % 33 + 1) + '.jpg'" alt="egjs" />
    </div>
    <div class="info">egjs {{item.data.key}}</div>
  </div>
</div>

import { Component, Input } from '@angular/core';
import { OnRequestAppend } from '@egjs/infinitegrid';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
})
export class AppComponent {
  items = this.getItems(0, 10);
  getItems(nextGroupKey: number, count: number) {
    const nextItems = [];
    const nextKey = nextGroupKey * count;

    for (let i = 0; i < count; ++i) {
      nextItems.push({ groupKey: nextGroupKey, key: nextKey + i });
    }
    return nextItems;
  }
  groupBy(_: any, item: any) {
    return item.groupKey;
  }
  trackBy(_: any, item: any) {
    return item.key;
  }
  onRequestAppend(e: OnRequestAppend) {
    const nextGroupKey = (+e.groupKey! || 0) + 1;

    this.items = [
      ...this.items,
      ...this.getItems(nextGroupKey, 10),
    ];
  }
}

<script>
  import { FrameInfiniteGrid } from "@egjs/svelte-infinitegrid";

  let items = getItems(0, 10);

  function getItems(nextGroupKey, count) {
    const nextItems = [];

    for (let i = 0; i < count; ++i) {
      const nextKey = nextGroupKey * count + i;

      nextItems.push({ groupKey: nextGroupKey, key: nextKey });
    }
    return nextItems;
  }
</script>

<FrameInfiniteGrid
  class="container"
  gap={5}
  frame={[[1,1,2,3,3],[1,1,4,4,5]]}
  {items}
  on:requestAppend={({ detail: e }) => {
    const nextGroupKey = (+e.groupKey || 0) + 1;

    items = [...items, ...getItems(nextGroupKey, 10)];
  }}
  let:visibleItems
>
  {#each visibleItems as item (item.key)}
    <div class="item">
      <div class="thumbnail">
        <img
          src={`https://naver.github.io/egjs-infinitegrid/assets/image/${
            (item.key % 33) + 1
          }.jpg`}
          alt="egjs" 
        />
      </div>
      <div class="info">{`egjs ${item.key}`}</div>
    </div>
  {/each}
</FrameInfiniteGrid>

PackingInfiniteGrid

The PackingGrid is a grid that shows the important items bigger without sacrificing the weight of the items.

Rows and columns are separated so that items are dynamically placed within the horizontal and vertical space rather than arranged in an orderly fashion.
If sizeWeight is higher than ratioWeight, the size of items is preserved as much as possible.
Conversely, if ratioWeight is higher than sizeWeight, the ratio of items is preserved as much as possible.

<div class="container"></div>

import { PackingInfiniteGrid } from "@egjs/infinitegrid";

function getItems(nextGroupKey, count) {
  const nextItems = [];

  for (let i = 0; i < count; ++i) {
    const num = nextGroupKey * count + i;
    nextItems.push(`<div class="item">
  <div class="thumbnail">
      <img src="https://naver.github.io/egjs-infinitegrid/assets/image/${(num % 33) + 1}.jpg" alt="egjs" />
  </div>
  <div class="info">egjs ${num}</div>
</div>`);
  }
  return nextItems;
}
const ig = new PackingInfiniteGrid(".container", {
  gap: 5,
});

ig.on("requestAppend", (e) => {
  const nextGroupKey = (+e.groupKey || 0) + 1;

  ig.append(getItems(nextGroupKey, 10), nextGroupKey);
});
ig.renderItems();

import * as React from "react";
import { PackingInfiniteGrid } from "@egjs/react-infinitegrid";

function getItems(nextGroupKey: number, count: number) {
  const nextItems = [];
  const nextKey = nextGroupKey * count;

  for (let i = 0; i < count; ++i) {
    nextItems.push({ groupKey: nextGroupKey, key: nextKey + i });
  }
  return nextItems;
}

const Item = ({ num }: any) => <div className="item" style={{
  width: "250px",
}}>
  <div className="thumbnail">
    <img
      src={`https://naver.github.io/egjs-infinitegrid/assets/image/${(num % 33) + 1}.jpg`}
      alt="egjs" 
    />
  </div>
  <div className="info">{`egjs ${num}`}</div>
</div>;

export default function App() {
  const [items, setItems] = React.useState(() => getItems(0, 10));

  return <PackingInfiniteGrid
    className="container"
    gap={5}
    onRequestAppend={(e) => {
      const nextGroupKey = (+e.groupKey! || 0) + 1;

      setItems([
        ...items,
        ...getItems(nextGroupKey, 10),
      ]);
    }}
  >
    {items.map((item) => <Item data-grid-groupkey={item.groupKey} key={item.key} num={item.key} />)}
  </PackingInfiniteGrid>;
}

<template>
  <packing-infinite-grid
    class="container"
    v-bind:gap="5"
    v-on:request-append="onRequestAppend"
  >
    <div
      class="item"
      v-for="item in items"
      :key="item.key"
      :data-grid-groupkey="item.groupKey"
    >
      <div class="thumbnail">
        <img
          v-bind:src="
            'https://naver.github.io/egjs-infinitegrid/assets/image/' +
            ((item.key % 33) + 1) +
            '.jpg'
          "
          alt="egjs" 
        />
      </div>
      <div class="info">egjs {{ item.key }}</div>
    </div>
  </packing-infinite-grid>
</template>
<script lang="ts">
import { PackingInfiniteGrid } from "@egjs/vue-infinitegrid";

export default {
  components: {
    PackingInfiniteGrid,
  },
  data() {
    return {
      items: this.getItems(0, 10),
    };
  },
  methods: {
    getItems(nextGroupKey: number, count: number) {
      const nextItems: any[] = [];

      for (let i = 0; i < count; ++i) {
        const nextKey = nextGroupKey * count + i;

        nextItems.push({ groupKey: nextGroupKey, key: nextKey });
      }
      return nextItems;
    },
    onRequestAppend(e) {
      const nextGroupKey = (+e.groupKey! || 0) + 1;

      this.items = [...this.items, ...this.getItems(nextGroupKey, 10)];
    },
  },
};
</script>

<template>
  <packing-infinite-grid
    class="container"
    v-bind:gap="5"
    v-on:request-append="onRequestAppend"
  >
    <div
      class="item"
      v-for="item in items"
      :key="item.key"
      :data-grid-groupkey="item.groupKey"
    >
      <div class="thumbnail">
        <img
          v-bind:src="
            'https://naver.github.io/egjs-infinitegrid/assets/image/' +
            ((item.key % 33) + 1) +
            '.jpg'
          "
          alt="egjs" 
        />
      </div>
      <div class="info">egjs {{ item.key }}</div>
    </div>
  </packing-infinite-grid>
</template>
<script lang="ts">
import { PackingInfiniteGrid } from "@egjs/vue3-infinitegrid";

export default {
  components: {
    PackingInfiniteGrid,
  },
  data() {
    return {
      items: this.getItems(0, 10),
    };
  },
  methods: {
    getItems(nextGroupKey: number, count: number) {
      const nextItems: any[] = [];

      for (let i = 0; i < count; ++i) {
        const nextKey = nextGroupKey * count + i;

        nextItems.push({ groupKey: nextGroupKey, key: nextKey });
      }
      return nextItems;
    },
    onRequestAppend(e) {
      const nextGroupKey = (+e.groupKey! || 0) + 1;

      this.items = [...this.items, ...this.getItems(nextGroupKey, 10)];
    },
  },
};
</script>

<div NgxPackingInfiniteGrid
  class="container"
  [gap]="5"
  [items]="items"
  [trackBy]="trackBy"
  [groupBy]="groupBy"
  (requestAppend)="onRequestAppend($event)"
  *ngFor="let item of [0]; trackBy: randomTrackBy;"
  #ig
  >
  <div class="item" *ngFor ="let item of ig.visibleItems; trackBy: trackBy;">
    <div class="thumbnail">
        <img [src]="'https://naver.github.io/egjs-infinitegrid/assets/image/' + (item.data.key % 33 + 1) + '.jpg'" alt="egjs" />
    </div>
    <div class="info">egjs {{item.data.key}}</div>
  </div>
</div>

import { Component, Input } from '@angular/core';
import { OnRequestAppend } from '@egjs/infinitegrid';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
})
export class AppComponent {
  items = this.getItems(0, 10);
  getItems(nextGroupKey: number, count: number) {
    const nextItems = [];
    const nextKey = nextGroupKey * count;

    for (let i = 0; i < count; ++i) {
      nextItems.push({ groupKey: nextGroupKey, key: nextKey + i });
    }
    return nextItems;
  }
  groupBy(_: any, item: any) {
    return item.groupKey;
  }
  trackBy(_: any, item: any) {
    return item.key;
  }
  onRequestAppend(e: OnRequestAppend) {
    const nextGroupKey = (+e.groupKey! || 0) + 1;

    this.items = [
      ...this.items,
      ...this.getItems(nextGroupKey, 10),
    ];
  }
}

<script>
  import { PackingInfiniteGrid } from "@egjs/svelte-infinitegrid";

  let items = getItems(0, 10);

  function getItems(nextGroupKey, count) {
    const nextItems = [];

    for (let i = 0; i < count; ++i) {
      const nextKey = nextGroupKey * count + i;

      nextItems.push({ groupKey: nextGroupKey, key: nextKey });
    }
    return nextItems;
  }
</script>

<PackingInfiniteGrid
  class="container"
  gap={5}
  {items}
  on:requestAppend={({ detail: e }) => {
    const nextGroupKey = (+e.groupKey || 0) + 1;

    items = [...items, ...getItems(nextGroupKey, 10)];
  }}
  let:visibleItems
>
  {#each visibleItems as item (item.key)}
    <div class="item">
      <div class="thumbnail">
        <img
          src={`https://naver.github.io/egjs-infinitegrid/assets/image/${
            (item.key % 33) + 1
          }.jpg`}
          alt="egjs" 
        />
      </div>
      <div class="info">{`egjs ${item.key}`}</div>
    </div>
  {/each}
</PackingInfiniteGrid>

Insert Data

Through scrolling, when the scroll reaches the end, the requestAppend event is raised, and when it reaches the start, the requestPrepend event is raised. You can add data within this event.

You can set the key of an item through itemBy prop.
You can set the group's key through groupBy prop.

If the append method or prepend method is used, there is no need to use a separate key. You can set the groupKey through the second argument.

ig.on("requestAppend", e => {
  const nextGroupKey = (+e.groupKey || 0) + 1;

  ig.append(getItems(nextGroupKey, 10), nextGroupKey);
});

React's groupBy default is jsx's data-grid-groupkey prop. (attributePrefix: data-grid-)
React's itemBy default is jsx's key.

const [items, setItems] = React.useState([]);

<MasonryInfiniteGrid
  groupBy={(jsx) => jsx.props["data-grid-groupkey"]}
  itemBy={(jsx) => jsx.key}
  onRequestAppend={(e) => {
    const nextGroupKey = (+e.groupKey! || 0) + 1;

    setItems([
      ...items,
      ...getItems(nextGroupKey, 10),
    ]);
  }}>
  {items.map((item) => <Item data-grid-groupkey={item.groupKey} key={item.key} num={item.key} />)}
</MasonryInfiniteGrid>

Vue's groupBy default is jsx's data-grid-groupkey prop. (attributePrefix: data-grid-)
Vue's itemBy default is jsx's key.

<masonry-infinite-grid
  :itemBy="itemBy"
  :groupBy="groupBy"
  @request-append="onRequestAppend">
  <div
    class="item"
    v-for="item in items"
    :key="item.key"
    :data-grid-groupkey="item.groupKey"
  >
    ...
  </div>
</masonry-infinite-grid>

export default {
  data() {
    return {
      items: [],
    },
  },
  methods: {
    itemBy(jsx) {
      const key = jsx.key;

      return key == null ? i : key;
    },
    groupBy(jsx) {
      const props = jsx.props || jsx.data?.attrs;

      return props ? props[`data-grid-groupkey`] : undefined;
    },
    onRequestAppend(e) {
      const nextGroupKey = (+e.groupKey! || 0) + 1;

      this.items = [
        ...this.items,
        ...getItems(nextGroupKey, 10),
      ];
  },
};

Vue's groupBy default is jsx's data-grid-groupkey prop. (attributePrefix: data-grid-)
Vue's itemBy default is jsx's key.

<masonry-infinite-grid
  :itemBy="itemBy"
  :groupBy="groupBy"
  @request-append="onRequestAppend">
  <div
    class="item"
    v-for="item in items"
    :key="item.key"
    :data-grid-groupkey="item.groupKey"
  >
    ...
  </div>
</masonry-infinite-grid>

export default {
  data() {
    return {
      items: [],
    },
  },
  methods: {
    itemBy(jsx) {
      const key = jsx.key;

      return key == null ? i : key;
    },
    groupBy(jsx) {
      const props = jsx.props || jsx.data?.attrs;

      return props ? props[`${attributePrefix}groupkey`] : undefined;
    },
    onRequestAppend(e) {
      const nextGroupKey = (+e.groupKey! || 0) + 1;

      this.items = [
        ...this.items,
        ...getItems(nextGroupKey, 10),
      ];
  },
};

* Angular uses `trackBy` instead of `itemBy`. * Angular's `groupBy` default is item's `groupKey`. * Angular's `trackBy` default is items's `key`.

<div NgxMasonryInfiniteGrid
  class="container"
  [items]="items"
  [trackBy]="trackBy"
  [groupBy]="groupBy"
  [useLoading]="true"
  (requestAppend)="onRequestAppend($event)"
  #ig
  >
  <div class="item" *ngFor ="let item of ig.visibleItems; trackBy: trackBy;">
    ...
  </div>
</div>

export default class App {
  items = [];
  groupBy(_: any, item: any) {
    return item.groupKey;
  }
  trackBy(_: any, item: any) {
    return item.key;
  }
  onRequestAppend(e) {
    const nextGroupKey = (+e.groupKey! || 0) + 1;

    this.items = [
      ...this.items,
      ...getItems(nextGroupKey, 10),
    ];
  }
};

Svelte's groupBy default is item's groupKey.
Svelte's itemBy default is items's key.

<script>
let items = [];
</script>
<MasonryInfiniteGrid
  items={items}
  groupBy={(item) => item.groupKey}
  itemBy={(item) => item.key}
  on:requestAppend={({ detail: e }) => {
    items = [
      ...items,
      ...getItems(nextGroupKey, 10),
    ];
  }}>
  {#each visibleItems as item (item.key)}
    <div class="item"></div>
  {/each}
</MasonryInfiniteGrid>

Wait Data Loading

Use wait & ready

If you want to add items asynchronously, call the e.wait function and when the data is ready call the e.ready function.

ig.on("requestAppend", e => {
  const nextGroupKey = (+e.groupKey || 0) + 1;

  e.wait();

  setTimeout(() => {
    e.ready();
    ig.append(getItems(nextGroupKey, 10), nextGroupKey);
  }, 1000);
});

const [items, setItems] = React.useState([]);

<MasonryInfiniteGrid
  onRequestAppend={(e) => {
    const nextGroupKey = (+e.groupKey! || 0) + 1;

    e.wait();
    setTimeout(() => {
      e.ready();
      setItems([
        ...items,
        ...getItems(nextGroupKey, 10),
      ]);
    }, 1000);
  }}>
  {items.map((item) => <Item data-grid-groupkey={item.groupKey} key={item.key} num={item.key} />)}
</MasonryInfiniteGrid>

export default {
  data() {
    return {
      items: [],
    },
  },
  methods: {
    onRequestAppend(e) {
      const nextGroupKey = (+e.groupKey! || 0) + 1;

      e.wait();
      setTimeout(() => {
        e.ready();
        this.items = [
          ...this.items,
          ...getItems(nextGroupKey, 10),
        ];
      }, 1000);
  },
};

export default {
  data() {
    return {
      items: [],
    },
  },
  methods: {
    onRequestAppend(e) {
      const nextGroupKey = (+e.groupKey! || 0) + 1;

      e.wait();
      setTimeout(() => {
        e.ready();
        this.items = [
          ...this.items,
          ...getItems(nextGroupKey, 10),
        ];
      }, 1000);
  },
};

export default class App {
  items = [];
  onRequestAppend(e) {
    const nextGroupKey = (+e.groupKey! || 0) + 1;

    e.wait();
    setTimeout(() => {
      e.ready();
      this.items = [
        ...this.items,
        ...getItems(nextGroupKey, 10),
      ];
    }, 1000);
  }
};

<script>
let items = [];
</script>
<MasonryInfiniteGrid
  on:requestAppend={({ detail: e }) => {
    e.wait();
    setTimeout(() => {
      e.ready();
      items = [
        ...items,
        ...getItems(nextGroupKey, 10),
      ];
    }, 1000);
  }}>
  {items.map((item) => <Item data-grid-groupkey={item.groupKey} key={item.key} num={item.key} />)}
</MasonryInfiniteGrid>

Use Placeholder

You can add placeholders to show instead while data is being loaded/added. The placeholder is placed on the grid instead of the actual item and can be maintained until the actual item is added.

You can set a placeholder through the ig.setPlaceholder method.

ig.setPlaceholder({
  html: `<div class="placeholder"></div>`,
});

ig.on("requestAppend", e => {
  const nextGroupKey = (+e.groupKey || 0) + 1;

  e.wait();
  e.currentTarget.appendPlaceholders(5, nextGroupKey);
  setTimeout(() => {
    e.ready();
    ig.append(getItems(nextGroupKey, 10), nextGroupKey);
  }, 1000);
});

You can set the placeholder via the placeholder prop.

const [items, setItems] = React.useState([]);

<MasonryInfiniteGrid
  placeholder={<div className="placeholder"></div>}
  onRequestAppend={(e) => {
    const nextGroupKey = (+e.groupKey! || 0) + 1;

    e.wait();
    e.currentTarget.appendPlaceholders(5, nextGroupKey);
    setTimeout(() => {
      e.ready();
      setItems([
        ...items,
        ...getItems(nextGroupKey, 10),
      ]);
    }, 1000);
  }}>
  {items.map((item) => <Item data-grid-groupkey={item.groupKey} key={item.key} num={item.key} />)}
</MasonryInfiniteGrid>

A placeholder can be set via a placeholder slot.

<masonry-infinite-grid
  @request-append="onRequestAppend">
  <div
    class="item"
    v-for="item in items"
    :key="item.key"
    :data-grid-groupkey="item.groupKey"
  ></div>
  <template v-slot:placeholder="{ item }">
    <div
      class="placeholder"
      :key="item.key"
      :data-grid-groupkey="item.groupKey"
    ></div>
  </template>
</masonry-infinite-grid>

export default {
  data() {
    return {
      items: [],
    },
  },
  methods: {
    onRequestAppend(e) {
      const nextGroupKey = (+e.groupKey! || 0) + 1;

      e.wait();
      e.currentTarget.appendPlaceholders(5, nextGroupKey);

      setTimeout(() => {
        e.ready();
        this.items = [
          ...this.items,
          ...getItems(nextGroupKey, 10),
        ];
      }, 1000);
  },
};

A placeholder can be set via a placeholder slot.

<masonry-infinite-grid
  @request-append="onRequestAppend">
  <div
    class="item"
    v-for="item in items"
    :key="item.key"
    :data-grid-groupkey="item.groupKey"
  ></div>
  <template v-slot:placeholder="{ item }">
    <div
      class="placeholder"
      :key="item.key"
      :data-grid-groupkey="item.groupKey"
    ></div>
  </template>
</masonry-infinite-grid>

export default {
  data() {
    return {
      items: [],
    },
  },
  methods: {
    onRequestAppend(e) {
      const nextGroupKey = (+e.groupKey! || 0) + 1;

      e.wait();
      e.currentTarget.appendPlaceholders(5, nextGroupKey);

      setTimeout(() => {
        e.ready();
        this.items = [
          ...this.items,
          ...getItems(nextGroupKey, 10),
        ];
      }, 1000);
  },
};

You can set the placeholder via usePlaceholder(true).

<div NgxMasonryInfiniteGrid
  class="container"
  [usePlaceholder]="true"
  (requestAppend)="onRequestAppend($event)"
  #ig
  >
  <ng-container *ngFor ="let item of ig.visibleItems; trackBy: trackBy;">
    <div class="item" *ngIf="item.type === ITEM_TYPE.NORMAL"></div>
    <div class="placeholder" *ngIf="item.type === ITEM_TYPE.VIRTUAL"></div>
  </ng-container>
</div>

import { ITEM_TYPE } from "@egjs/infinitegrid";

export default class App {
  ITEM_TYPE = ITEM_TYPE;
  items = [];
  onRequestAppend(e) {
    const nextGroupKey = (+e.groupKey! || 0) + 1;

    e.wait();
    e.currentTarget.appendPlaceholders(5, nextGroupKey);

    setTimeout(() => {
      e.ready();
      this.items = [
        ...this.items,
        ...getItems(nextGroupKey, 10),
      ];
    }, 1000);
  }
};

You can set the placeholder via usePlaceholder(true).

<script>
import { ITEM_TYPE } from "@egjs/infinitegrid";

let items = [];
</script>
<MasonryInfiniteGrid
  usePlaceholder={true}
  on:requestAppend={({ detail: e }) => {
    e.wait();
    setTimeout(() => {
      e.ready();
      items = [
        ...items,
        ...getItems(nextGroupKey, 10),
      ];
    }, 1000);
  }}
  let:visibleItems
>
  {#each visibleItems as item (item.key)}
    {#if item.type === ITEM_TYPE.NORMAL}
      <div class="item"></div>
    {:else if item.type === ITEM_TYPE.VIRTUAL}
      <div class="placeholder" />
    {/if}
  {/each}
</MasonryInfiniteGrid>

Use loading

You can show the loading bar while the data is loading. It can be added by calling the e.wait function, and the loading bar automatically disappears when data is loaded.

You can set a loading through the ig.setLoading method.

ig.setLoading({
  html: `<div class="loading">Loading...</div>`,
});

ig.on("requestAppend", e => {
  const nextGroupKey = (+e.groupKey || 0) + 1;

  e.wait();
  setTimeout(() => {
    e.ready();
    ig.append(getItems(nextGroupKey, 10), nextGroupKey);
  }, 1000);
});

You can set the loading via the loading prop.

const [items, setItems] = React.useState([]);

<MasonryInfiniteGrid
  loading={<div className="loading">Loading...</div>}
  onRequestAppend={(e) => {
    const nextGroupKey = (+e.groupKey! || 0) + 1;

    e.wait();
    setTimeout(() => {
      e.ready();
      setItems([
        ...items,
        ...getItems(nextGroupKey, 10),
      ]);
    }, 1000);
  }}>
  {items.map((item) => <Item data-grid-groupkey={item.groupKey} key={item.key} num={item.key} />)}
</MasonryInfiniteGrid>

A loading can be set via a loading slot.

<masonry-infinite-grid
  @request-append="onRequestAppend">
  <div
    class="item"
    v-for="item in items"
    :key="item.key"
    :data-grid-groupkey="item.groupKey"
  ></div>
  <template v-slot:loading="{ item }">
    <div
      class="loading"
      :key="item.key"
      :data-grid-groupkey="item.groupKey"
    >Loading...</div>
  </template>
</masonry-infinite-grid>

export default {
  data() {
    return {
      items: [],
    },
  },
  methods: {
    onRequestAppend(e) {
      const nextGroupKey = (+e.groupKey! || 0) + 1;

      e.wait();
      setTimeout(() => {
        e.ready();
        this.items = [
          ...this.items,
          ...getItems(nextGroupKey, 10),
        ];
      }, 1000);
  },
};

A loading can be set via a loading slot.

<masonry-infinite-grid
  @request-append="onRequestAppend">
  <div
    class="item"
    v-for="item in items"
    :key="item.key"
    :data-grid-groupkey="item.groupKey"
  ></div>
  <template v-slot:loading="{ item }">
    <div
      class="loading"
      :key="item.key"
      :data-grid-groupkey="item.groupKey"
    >Loading...</div>
  </template>
</masonry-infinite-grid>

export default {
  data() {
    return {
      items: [],
    },
  },
  methods: {
    onRequestAppend(e) {
      const nextGroupKey = (+e.groupKey! || 0) + 1;

      e.wait();
      setTimeout(() => {
        e.ready();
        this.items = [
          ...this.items,
          ...getItems(nextGroupKey, 10),
        ];
      }, 1000);
  },
};

You can set the loading via useLoading(true).

<div NgxMasonryInfiniteGrid
  class="container"
  [useLoading]="true"
  (requestAppend)="onRequestAppend($event)"
  #ig
  >
  <ng-container *ngFor ="let item of ig.visibleItems; trackBy: trackBy;">
    <div class="item" *ngIf="item.type === ITEM_TYPE.NORMAL"></div>
    <div class="loading" *ngIf="item.type === ITEM_TYPE.LOADING">Loading...</div>
  </ng-container>
</div>

import { ITEM_TYPE } from "@egjs/infinitegrid";

export default class App {
  ITEM_TYPE = ITEM_TYPE;
  items = [];
  onRequestAppend(e) {
    const nextGroupKey = (+e.groupKey! || 0) + 1;

    e.wait();
    setTimeout(() => {
      e.ready();
      this.items = [
        ...this.items,
        ...getItems(nextGroupKey, 10),
      ];
    }, 1000);
  }
};

You can set the loading via useLoading(true).

<script>
import { ITEM_TYPE } from "@egjs/infinitegrid";

let items = [];
</script>
<MasonryInfiniteGrid
  useLoading={true}
  on:requestAppend={({ detail: e }) => {
    e.wait();
    setTimeout(() => {
      e.ready();
      items = [
        ...items,
        ...getItems(nextGroupKey, 10),
      ];
    }, 1000);
  }}
  let:visibleItems
>
  {#each visibleItems as item (item.key)}
    {#if item.type === ITEM_TYPE.NORMAL}
      <div class="item"></div>
    {:else if item.type === ITEM_TYPE.LOADING}
      <div class="loading">Loading...</div>
    {/if}
  {/each}
</MasonryInfiniteGrid>

Restore Status

You want to save the current status to storage before moving the page and restore it after returning the page.

If it does not support BF Cache like Safari, you need to save and restore the status.

InfiniteGrid provides a way to get and restore status.

If you want to restore dynamically, call the setStatus method.

In the framework, items must also be saved and restored.

Get Status & Restore Status

Get Status

const status = ig.getStatus();

Restore Status

const ig = new MasonryInfiniteGrid(...);

ig.setStatus(status);

Get Status

const igRef = React.useRef();

igRef.current.getStatus();

<MasonryInfiniteGrid
  ref={igRef}>...</MasonryInfiniteGrid>

Restore Status

<MasonryInfiniteGrid
  ref={igRef}
  status={status}
  >...</MasonryInfiniteGrid>

Get Status

<masonry-infinite-grid ref="ig">
  ...
</masonry-infinite-grid>

this.$refs.ig.getStatus();

Restore Status

<masonry-infinite-grid v-bind:status="status">
  ...
</masonry-infinite-grid>

Get Status

<masonry-infinite-grid ref="ig">
  ...
</masonry-infinite-grid>

this.$refs.ig.getStatus();

Restore Status

<masonry-infinite-grid v-bind:status="status">
  ...
</masonry-infinite-grid>

Get Status

<div NgxMasonryInfiniteGrid #ig>
  ...
</div>

import { Component, Input, AfterViewInit } from '@angular/core';
import { NgxInfiniteGridComponent } from '@egjs/ngx-infinitegrid';

class App {
  @ViewChild("ig") ig!: NgxInfiniteGridComponent;
  getStatus() {
    this.ig.getStatus();
  }
}

Restore Status

<div NgxMasonryInfiniteGrid [status]="status" #ig>
  ...
</div>

Get Status

let ig;

ig.getStatus();

<MasonryInfiniteGrid
  bind:this={ig}>
</MasonryInfiniteGrid>

Restore Status

<MasonryInfiniteGrid
  status={status}
  bind:this={ig}>
</MasonryInfiniteGrid>

Restore Visible Status

To reduce the size of the status, only the status of the items in the visible area is fetched.

import { STATUS_TYPE } from "@egjs/infinitegrid";

// (default) gets all infos
ig.getStatus(STATUS_TYPE.NOT_REMOVE);

// gets visible infos
ig.getStatus(STATUS_TYPE.REMOVE_INVISIBLE_GROUPS);

// gets visible infos. However, the information is simplified for invisible items.
ig.getStatus(STATUS.MINIMIZE_INVISIBLE_ITEMS);

// gets visible infos. However, invisible items are removed and only the outline remains.
ig.getStatus(STATUS.MINIMIZE_INVISIBLE_GROUPS);

import { STATUS_TYPE } from "@egjs/infinitegrid";

const status = ig.getStatus(STATUS_TYPE.MINIMIZE_INVISIBLE_ITEMS);
const [startCursor, endCursor] = status.groupManager.itemCursors;
const itemsStatus = items.slice(startCursor, endCursor + 1);

Restore Visible Status with virtual items

Since you got the status for the visible area, replace it with a placeholder to handle the invisible area.

<div class="container"></div>

import { MasonryInfiniteGrid } from "@egjs/infinitegrid";

function getItems(nextGroupKey, count) {
  const nextItems = [];

  for (let i = 0; i < count; ++i) {
    const num = nextGroupKey * count + i;
    nextItems.push(`<div class="item">
  <div class="thumbnail">
      <img src="https://naver.github.io/egjs-infinitegrid/assets/image/${(num % 33) + 1}.jpg" alt="egjs" />
  </div>
  <div class="info">egjs ${num}</div>
</div>`);
  }
  return nextItems;
}
const ig = new MasonryInfiniteGrid(".container", {
  gap: 5,
});

ig.setPlaceholder({
  html: `<div class="placeholder"></div>`,
});


ig.on("requestPrepend", e => {
  if (e.isVirtual) {
    e.wait();
    setTimeout(() => {
      e.ready();
      ig.prepend(getItems(nextGroupKey, 10), nextGroupKey);
    }, 200);
  }
});
ig.on("requestAppend", e => {
  if (e.isVirtual) {
    e.wait();
    e.currentTarget.appendPlaceholders(5, nextGroupKey);
    setTimeout(() => {
      e.ready();
      ig.append(getItems(nextGroupKey, 10), nextGroupKey);
    }, 200);
  }
});
ig.renderItems();

import * as React from "react";
import { MasonryInfiniteGrid } from "@egjs/react-infinitegrid";

function getItems(nextGroupKey: number, count: number) {
  const nextItems = [];
  const nextKey = nextGroupKey * count;

  for (let i = 0; i < count; ++i) {
    nextItems.push({ groupKey: nextGroupKey, key: nextKey + i });
  }
  return nextItems;
}

const Item = ({ num }: any) => <div className="item" style={{
  width: "250px",
}}>
  <div className="thumbnail">
    <img
      src={`https://naver.github.io/egjs-infinitegrid/assets/image/${(num % 33) + 1}.jpg`}
      alt="egjs" 
    />
  </div>
  <div className="info">{`egjs ${num}`}</div>
</div>;

export default function App() {
  const [items, setItems] = React.useState(() => getItems(0, 10));

  return <MasonryInfiniteGrid
    className="container"
    gap={5}
    placeholder={<div className="placeholder"></div>}
    onRequestPrepend={(e) => {
      if (e.isVirtual) {
        e.wait();
        setTimeout(() => {
          e.ready();
          setItems([
            ...getItems(e.nextGroupKey, 10),
            ...items,
          ]);
        }, 200);
      }
    }}
    onRequestAppend={(e) => {
      if (e.isVirtual) {
        e.wait();
        setTimeout(() => {
          e.ready();
          setItems([
            ...items,
            ...getItems(e.nextGroupKey, 10),
          ]);
        }, 200);
      }
    }}
  >
    {items.map((item) => <Item data-grid-groupkey={item.groupKey} key={item.key} num={item.key} />)}
  </MasonryInfiniteGrid>;
}

<template>
  <masonry-infinite-grid
    class="container"
    v-bind:gap="5"
    v-on:request-append="onRequestAppend"
    v-on:request-prepend="onRequestPrepend"
  >
    <div
      class="item"
      v-for="item in items"
      :key="item.key"
      :data-grid-groupkey="item.groupKey"
    >
      <div class="thumbnail">
        <img
          v-bind:src="
            'https://naver.github.io/egjs-infinitegrid/assets/image/' +
            ((item.key % 33) + 1) +
            '.jpg'
          "
          alt="egjs" 
        />
      </div>
      <div class="info">egjs {{ item.key }}</div>
    </div>
    <template v-slot:placeholder="{ item }">
    <div
      class="placeholder"
      :key="item.key"
      :data-grid-groupkey="item.groupKey"
    ></div>
  </template>
  </masonry-infinite-grid>
</template>
<script lang="ts">
import { MasonryInfiniteGrid } from "@egjs/vue-infinitegrid";

export default {
  components: {
    MasonryInfiniteGrid,
  },
  data() {
    return {
      items: this.getItems(0, 10),
    };
  },
  methods: {
    getItems(nextGroupKey: number, count: number) {
      const nextItems: any[] = [];

      for (let i = 0; i < count; ++i) {
        const nextKey = nextGroupKey * count + i;

        nextItems.push({ groupKey: nextGroupKey, key: nextKey });
      }
      return nextItems;
    },
    onRequestPrepend(e: OnRequestPrepend) {
    if (e.isVirtual) {
      e.wait();
      setTimeout(() => {
        e.ready();
        this.items = [
          ...this.getItems(e.nextGroupKey, 10),
          ...this.items,
        ];
      }, 200);
    }
  },
  onRequestAppend(e: OnRequestAppend) {
    if (e.isVirtual) {
      e.wait();
      setTimeout(() => {
        e.ready();
        this.items = [
          ...this.items,
          ...this.getItems(e.nextGroupKey, 10),
        ];
      }, 200);
    }
  },
};
</script>

<template>
  <masonry-infinite-grid
    class="container"
    v-bind:gap="5"
    v-on:request-append="onRequestAppend"
    v-on:request-prepend="onRequestPrepend"
  >
    <div
      class="item"
      v-for="item in items"
      :key="item.key"
      :data-grid-groupkey="item.groupKey"
    >
      <div class="thumbnail">
        <img
          v-bind:src="
            'https://naver.github.io/egjs-infinitegrid/assets/image/' +
            ((item.key % 33) + 1) +
            '.jpg'
          "
          alt="egjs" 
        />
      </div>
      <div class="info">egjs {{ item.key }}</div>
    </div>
    <template v-slot:placeholder="{ item }">
    <div
      class="placeholder"
      :key="item.key"
      :data-grid-groupkey="item.groupKey"
    ></div>
  </template>
  </masonry-infinite-grid>
</template>
<script lang="ts">
import { MasonryInfiniteGrid } from "@egjs/vue3-infinitegrid";

export default {
  components: {
    MasonryInfiniteGrid,
  },
  data() {
    return {
      items: this.getItems(0, 10),
    };
  },
  methods: {
    getItems(nextGroupKey: number, count: number) {
      const nextItems: any[] = [];

      for (let i = 0; i < count; ++i) {
        const nextKey = nextGroupKey * count + i;

        nextItems.push({ groupKey: nextGroupKey, key: nextKey });
      }
      return nextItems;
    },
    onRequestPrepend(e: OnRequestPrepend) {
    if (e.isVirtual) {
      e.wait();
      setTimeout(() => {
        e.ready();
        this.items = [
          ...this.getItems(e.nextGroupKey, 10),
          ...this.items,
        ];
      }, 200);
    }
  },
  onRequestAppend(e: OnRequestAppend) {
    if (e.isVirtual) {
      e.wait();
      setTimeout(() => {
        e.ready();
        this.items = [
          ...this.items,
          ...this.getItems(e.nextGroupKey, 10),
        ];
      }, 200);
    }
  },
};
</script>

<div NgxMasonryInfiniteGrid
  class="container"
  [gap]="5"
  [items]="items"
  [usePlaceholder]="true"
  [trackBy]="trackBy"
  [groupBy]="groupBy"
  (requestAppend)="onRequestAppend($event)"
  (requestPrepend)="onRequestPrepend($event)"
  *ngFor="let item of [0]; trackBy: randomTrackBy;"
  #ig
  >
  <ng-container *ngFor ="let item of ig.visibleItems; trackBy: trackBy;">
    <div class="item" *ngIf="item.type === ITEM_TYPE.NORMAL">
      <div class="thumbnail">
          <img [src]="'https://naver.github.io/egjs-infinitegrid/assets/image/' + (item.data.key % 33 + 1) + '.jpg'" alt="egjs" />
      </div>
      <div class="info">egjs {{item.data.key}}</div>
    </div>
    <div class="placeholder" *ngIf="item.type === ITEM_TYPE.VIRTUAL"></div>
  </ng-contianer>
</div>

import { Component, Input } from '@angular/core';
import { ITEM_TYPE, OnRequestPrepend, OnRequestAppend } from '@egjs/infinitegrid';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
})
export class AppComponent {
  ITEM_TYPE = ITEM_TYPE;
  items = this.getItems(0, 10);
  getItems(nextGroupKey: number, count: number) {
    const nextItems = [];
    const nextKey = nextGroupKey * count;

    for (let i = 0; i < count; ++i) {
      nextItems.push({ groupKey: nextGroupKey, key: nextKey + i });
    }
    return nextItems;
  }
  onRequestPrepend(e: OnRequestPrepend) {
    if (e.isVirtual) {
      e.wait();
      setTimeout(() => {
        e.ready();
        this.items = [
          ...this.getItems(e.nextGroupKey, 10),
          ...this.items,
        ];
      }, 200);
    }
  }
  onRequestAppend(e: OnRequestAppend) {
    if (e.isVirtual) {
      e.wait();
      setTimeout(() => {
        e.ready();
        this.items = [
          ...this.items,
          ...this.getItems(e.nextGroupKey, 10),
        ];
      }, 200);
    }
  }
}

<script>
  import { MasonryInfiniteGrid } from "@egjs/svelte-infinitegrid";
  import { ITEM_TYPE } from "@egjs/infinitegrid";

  let items = getItems(0, 10);

  function getItems(nextGroupKey, count) {
    const nextItems = [];

    for (let i = 0; i < count; ++i) {
      const nextKey = nextGroupKey * count + i;

      nextItems.push({ groupKey: nextGroupKey, key: nextKey });
    }
    return nextItems;
  }
</script>

<MasonryInfiniteGrid
  class="container"
  gap={5}
  {items}
  usePlaceholder={true}
  on:requestPrepend={({ detail: e }) => {
      if (e.isVirtual) {
        e.wait();
        setTimeout(() => {
          e.ready();
          items = [
            ...getItems(e.nextGroupKey, 10),
            ...items,
          ];
        }, 200);
      }
    }}
    on:requestAppend={({ detail: e }) => {
      if (e.isVirtual) {
        e.wait();
        setTimeout(() => {
          e.ready();
          items =[
            ...items,
            ...getItems(e.nextGroupKey, 10),
          ];
        }, 200);
      }
    }}
  let:visibleItems
>
  {#each visibleItems as item (item.key)}
    {#if item.type === ITEM_TYPE.NORMAL}
      <div class="item">
        <div class="thumbnail">
          <img
            src={`https://naver.github.io/egjs-infinitegrid/assets/image/${
              (item.key % 33) + 1
            }.jpg`}
            alt="egjs" 
          />
        </div>
        <div class="info">{`egjs ${item.key}`}</div>
      </div>
    {:else if item.type === ITEM_TYPE.VIRTUAL}
      <div class="placeholder" />
    {/if}
  {/each}
</MasonryInfiniteGrid>

Restore Visible Status with virtual items and scroll 0

Since you got the status for the visible area, replace it with a placeholder to handle the invisible area.

Even if you move the scroll to 0 to the invisible area, all items can be restored.

<div class="container"></div>

import { MasonryInfiniteGrid } from "@egjs/infinitegrid";

function getItems(nextGroupKey, count) {
  const nextItems = [];

  for (let i = 0; i < count; ++i) {
    const num = nextGroupKey * count + i;
    nextItems.push({
      groupKey: nextGroupKey,
      key: num,
      html: `<div class="item">
  <div class="thumbnail">
      <img src="https://naver.github.io/egjs-infinitegrid/assets/image/${(num % 33) + 1}.jpg" alt="egjs" />
  </div>
  <div class="info">egjs ${num}</div>
</div>`,
    });
  }
  return nextItems;
}
const ig = new MasonryInfiniteGrid(".container", {
  gap: 5,
});

ig.setPlaceholder({
  html: `<div class="placeholder"></div>`,
});


ig.on("requestPrepend", e => {
  if (e.isVirtual) {
    e.wait();
    setTimeout(() => {
      e.ready();
      ig.prepend(e.nextGroupKeys.map(key => getItems(key, 10)).flat());
    }, 200);
  }
});
ig.on("requestAppend", e => {
  if (e.isVirtual) {
    e.wait();
    e.currentTarget.appendPlaceholders(5, nextGroupKey);
    setTimeout(() => {
      e.ready();
      ig.append(e.nextGroupKeys.map(key => getItems(key, 10)).flat());
    }, 200);
  }
});
ig.renderItems();

import * as React from "react";
import { MasonryInfiniteGrid } from "@egjs/react-infinitegrid";

function getItems(nextGroupKey: number, count: number) {
  const nextItems = [];
  const nextKey = nextGroupKey * count;

  for (let i = 0; i < count; ++i) {
    nextItems.push({ groupKey: nextGroupKey, key: nextKey + i });
  }
  return nextItems;
}

const Item = ({ num }: any) => <div className="item" style={{
  width: "250px",
}}>
  <div className="thumbnail">
    <img
      src={`https://naver.github.io/egjs-infinitegrid/assets/image/${(num % 33) + 1}.jpg`}
      alt="egjs" 
    />
  </div>
  <div className="info">{`egjs ${num}`}</div>
</div>;

export default function App() {
  const [items, setItems] = React.useState(() => getItems(0, 10));

  return <MasonryInfiniteGrid
    className="container"
    gap={5}
    placeholder={<div className="placeholder"></div>}
    onRequestPrepend={(e) => {
      if (e.isVirtual) {
        e.wait();
        setTimeout(() => {
          e.ready();
          setItems([
            ...e.nextGroupKeys.map(key => getItems(key as number, 10)).flat(),
            ...items,
          ]);
        }, 200);
      }
    }}
    onRequestAppend={(e) => {
      if (e.isVirtual) {
        e.wait();
        setTimeout(() => {
          e.ready();
          setItems([
            ...items,
            ...e.nextGroupKeys.map(key => getItems(key as number, 10)).flat(),
          ]);
        }, 200);
      }
    }}
  >
    {items.map((item) => <Item data-grid-groupkey={item.groupKey} key={item.key} num={item.key} />)}
  </MasonryInfiniteGrid>;
}

<template>
  <masonry-infinite-grid
    class="container"
    v-bind:gap="5"
    v-on:request-append="onRequestAppend"
    v-on:request-prepend="onRequestPrepend"
  >
    <div
      class="item"
      v-for="item in items"
      :key="item.key"
      :data-grid-groupkey="item.groupKey"
    >
      <div class="thumbnail">
        <img
          v-bind:src="
            'https://naver.github.io/egjs-infinitegrid/assets/image/' +
            ((item.key % 33) + 1) +
            '.jpg'
          "
          alt="egjs" 
        />
      </div>
      <div class="info">egjs {{ item.key }}</div>
    </div>
    <template v-slot:placeholder="{ item }">
    <div
      class="placeholder"
      :key="item.key"
      :data-grid-groupkey="item.groupKey"
    ></div>
  </template>
  </masonry-infinite-grid>
</template>
<script lang="ts">
import { MasonryInfiniteGrid } from "@egjs/vue-infinitegrid";

export default {
  components: {
    MasonryInfiniteGrid,
  },
  data() {
    return {
      items: this.getItems(0, 10),
    };
  },
  methods: {
    getItems(nextGroupKey: number, count: number) {
      const nextItems: any[] = [];

      for (let i = 0; i < count; ++i) {
        const nextKey = nextGroupKey * count + i;

        nextItems.push({ groupKey: nextGroupKey, key: nextKey });
      }
      return nextItems;
    },
    onRequestPrepend(e: OnRequestPrepend) {
    if (e.isVirtual) {
      e.wait();
      setTimeout(() => {
        e.ready();
        this.items = [
          ...e.nextGroupKeys.map(key => this.getItems(key, 10)).flat(),
          ...this.items,
        ];
      }, 200);
    }
  },
  onRequestAppend(e: OnRequestAppend) {
    if (e.isVirtual) {
      e.wait();
      setTimeout(() => {
        e.ready();
        this.items = [
          ...this.items,
          ...e.nextGroupKeys.map(key => this.getItems(key, 10)).flat(),
        ];
      }, 200);
    }
  },
};
</script>

<template>
  <masonry-infinite-grid
    class="container"
    v-bind:gap="5"
    v-on:request-append="onRequestAppend"
    v-on:request-prepend="onRequestPrepend"
  >
    <div
      class="item"
      v-for="item in items"
      :key="item.key"
      :data-grid-groupkey="item.groupKey"
    >
      <div class="thumbnail">
        <img
          v-bind:src="
            'https://naver.github.io/egjs-infinitegrid/assets/image/' +
            ((item.key % 33) + 1) +
            '.jpg'
          "
          alt="egjs" 
        />
      </div>
      <div class="info">egjs {{ item.key }}</div>
    </div>
    <template v-slot:placeholder="{ item }">
    <div
      class="placeholder"
      :key="item.key"
      :data-grid-groupkey="item.groupKey"
    ></div>
  </template>
  </masonry-infinite-grid>
</template>
<script lang="ts">
import { MasonryInfiniteGrid } from "@egjs/vue3-infinitegrid";

export default {
  components: {
    MasonryInfiniteGrid,
  },
  data() {
    return {
      items: this.getItems(0, 10),
    };
  },
  methods: {
    getItems(nextGroupKey: number, count: number) {
      const nextItems: any[] = [];

      for (let i = 0; i < count; ++i) {
        const nextKey = nextGroupKey * count + i;

        nextItems.push({ groupKey: nextGroupKey, key: nextKey });
      }
      return nextItems;
    },
    onRequestPrepend(e: OnRequestPrepend) {
    if (e.isVirtual) {
      e.wait();
      setTimeout(() => {
        e.ready();
        this.items = [
          ...e.nextGroupKeys.map(key => this.getItems(key, 10)).flat(),
          ...this.items,
        ];
      }, 200);
    }
  },
  onRequestAppend(e: OnRequestAppend) {
    if (e.isVirtual) {
      e.wait();
      setTimeout(() => {
        e.ready();
        this.items = [
          ...this.items,
          ...e.nextGroupKeys.map(key => this.getItems(key, 10)).flat(),
        ];
      }, 200);
    }
  },
};
</script>

<div NgxMasonryInfiniteGrid
  class="container"
  [gap]="5"
  [items]="items"
  [usePlaceholder]="true"
  [trackBy]="trackBy"
  [groupBy]="groupBy"
  (requestAppend)="onRequestAppend($event)"
  (requestPrepend)="onRequestPrepend($event)"
  *ngFor="let item of [0]; trackBy: randomTrackBy;"
  #ig
  >
  <ng-container *ngFor ="let item of ig.visibleItems; trackBy: trackBy;">
    <div class="item" *ngIf="item.type === ITEM_TYPE.NORMAL">
      <div class="thumbnail">
          <img [src]="'https://naver.github.io/egjs-infinitegrid/assets/image/' + (item.data.key % 33 + 1) + '.jpg'" alt="egjs" />
      </div>
      <div class="info">egjs {{item.data.key}}</div>
    </div>
    <div class="placeholder" *ngIf="item.type === ITEM_TYPE.VIRTUAL"></div>
  </ng-contianer>
</div>

import { Component, Input } from '@angular/core';
import { ITEM_TYPE, OnRequestPrepend, OnRequestAppend } from '@egjs/infinitegrid';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
})
export class AppComponent {
  ITEM_TYPE = ITEM_TYPE;
  items = this.getItems(0, 10);
  getItems(nextGroupKey: number, count: number) {
    const nextItems = [];
    const nextKey = nextGroupKey * count;

    for (let i = 0; i < count; ++i) {
      nextItems.push({ groupKey: nextGroupKey, key: nextKey + i });
    }
    return nextItems;
  }
  onRequestPrepend(e: OnRequestPrepend) {
    if (e.isVirtual) {
      e.wait();
      setTimeout(() => {
        e.ready();
        this.items = [
          ...e.nextGroupKeys.map(key => this.getItems(key as number, 10)).flat(),
          ...this.items,
        ];
      }, 200);
    }
  }
  onRequestAppend(e: OnRequestAppend) {
    if (e.isVirtual) {
      e.wait();
      setTimeout(() => {
        e.ready();
        this.items = [
          ...this.items,
          ...e.nextGroupKeys.map(key => this.getItems(key as number, 10)).flat(),
        ];
      }, 200);
    }
  }
}

<script>
  import { MasonryInfiniteGrid } from "@egjs/svelte-infinitegrid";
  import { ITEM_TYPE } from "@egjs/infinitegrid";

  let items = getItems(0, 10);

  function getItems(nextGroupKey, count) {
    const nextItems = [];

    for (let i = 0; i < count; ++i) {
      const nextKey = nextGroupKey * count + i;

      nextItems.push({ groupKey: nextGroupKey, key: nextKey });
    }
    return nextItems;
  }
</script>

<MasonryInfiniteGrid
  class="container"
  gap={5}
  {items}
  usePlaceholder={true}
  on:requestPrepend={({ detail: e }) => {
      if (e.isVirtual) {
        e.wait();
        setTimeout(() => {
          e.ready();
          items = [
            ...e.nextGroupKeys.map(key => getItems(key, 10)).flat(),
            ...items,
          ];
        }, 200);
      }
    }}
    on:requestAppend={({ detail: e }) => {
      if (e.isVirtual) {
        e.wait();
        setTimeout(() => {
          e.ready();
          items =[
            ...items,
            ...e.nextGroupKeys.map(key => getItems(key, 10)).flat(),
          ];
        }, 200);
      }
    }}
  let:visibleItems
>
  {#each visibleItems as item (item.key)}
    {#if item.type === ITEM_TYPE.NORMAL}
      <div class="item">
        <div class="thumbnail">
          <img
            src={`https://naver.github.io/egjs-infinitegrid/assets/image/${
              (item.key % 33) + 1
            }.jpg`}
            alt="egjs" 
          />
        </div>
        <div class="info">{`egjs ${item.key}`}</div>
      </div>
    {:else if item.type === ITEM_TYPE.VIRTUAL}
      <div class="placeholder" />
    {/if}
  {/each}
</MasonryInfiniteGrid>

Use Transition

If you want to use transition, use CSS.

.item {
  transition: all ease 0.2s;
}

Guides

Grid Types​

MasonryInfiniteGrid​

JustifiedInfiniteGrid​

JustifiedInfiniteGrid (Stretch)​

FrameInfiniteGrid​

PackingInfiniteGrid​

Insert Data​

Wait Data Loading​

Use wait & ready​

Use Placeholder​

Use loading​

Restore Status​

Get Status & Restore Status​

Restore Visible Status​

Restore Visible Status with virtual items​

Restore Visible Status with virtual items and scroll 0​

Use Transition​

Grid Types

MasonryInfiniteGrid

JustifiedInfiniteGrid

JustifiedInfiniteGrid (Stretch)

FrameInfiniteGrid

PackingInfiniteGrid

Insert Data

Wait Data Loading

Use wait & ready

Use Placeholder

Use loading

Restore Status

Get Status & Restore Status

Restore Visible Status

Restore Visible Status with virtual items

Restore Visible Status with virtual items and scroll 0

Use Transition