バーチャルリストのReactコンポーネント

Examples

仮想リストと、仮想リストのアイテムを検索するサーチバーを使った全ページの例を示します。

import React, { useState } from 'react';
import {
  Page,
  Navbar,
  Subnavbar,
  Searchbar,
  Block,
  List,
  ListItem,
  theme,
} from 'framework7-react';

export default () => {
  const items = [];
  for (let i = 1; i <= 10000; i += 1) {
    items.push({
      title: `Item ${i}`,
      subtitle: `Subtitle ${i}`,
    });
  }
  const [vlData, setVlData] = useState({
    items: [],
  });

  const searchAll = (query, searchItems) => {
    const found = [];
    for (let i = 0; i < searchItems.length; i += 1) {
      if (
        searchItems[i].title.toLowerCase().indexOf(query.toLowerCase()) >= 0 ||
        query.trim() === ''
      )
        found.push(i);
    }
    return found; // return array with mathced indexes
  };
  const renderExternal = (vl, newData) => {
    setVlData({ ...newData });
  };
  return (
    
      
    <Page>
      <Navbar title="Virtual List" backLink="Back">
        <Subnavbar inner={false}>
          <Searchbar
            searchContainer=".virtual-list"
            searchItem="li"
            searchIn=".item-title"
            disableButton={!theme.aurora}
          />
        </Subnavbar>
      </Navbar>
      <Block>
        <p>
          Virtual List allows to render lists with huge amount of elements without loss of
          performance. And it is fully compatible with all Framework7 list components such as
          Search Bar, Infinite Scroll, Pull To Refresh, Swipeouts (swipe-to-delete) and
          Sortable.
        </p>
        <p>Here is the example of virtual list with 10 000 items:</p>
      </Block>
      <List className="searchbar-not-found">
        <ListItem title="Nothing found" />
      </List>
      <List
        className="searchbar-found"
        medialList
        virtualList
        virtualListParams={{
          items,
          searchAll,
          renderExternal,
          height: theme.ios ? 63 : theme.md ? 73 : 77,
        }}
      >
        <ul>
          {vlData.items.map((item, index) => (
            <ListItem
              key={index}
              mediaItem
              link="#"
              title={item.title}
              subtitle={item.subtitle}
              style={{ top: `${vlData.topPosition}px` }}
              virtualListIndex={items.indexOf(item)}
            />
          ))}
        </ul>
      </List>
    </Page>
      
    
  );
};