CollectionView:フィルターの連結

CollectionView.filterプロパティを使用すると、コレクションに対して1つのフィルタ関数を指定できますが、1つのフィルタの結果を使用して2次フィルタを作成することができます。

これは連鎖と呼ばれ、他のCollectionViewを使用して実行できます。

CollectionView.filtersプロパティを使用して、複数のフィルター関数をビューに追加することもできます。これは通常、フィルターを連鎖させるよりも簡単で効率的な新しいオプションです。

import 'bootstrap.css'; import '@grapecity/wijmo.styles/wijmo.css'; import './styles.css'; // import * as wijmo from '@grapecity/wijmo'; import * as grid from '@grapecity/wijmo.grid'; import * as gridFilter from '@grapecity/wijmo.grid.filter'; import { getData } from './data'; // document.readyState === 'complete' ? init() : window.onload = init; // function init() { // // create a CollectionView based on the raw data let view = new wijmo.CollectionView(getData()); // // create a second CollectionView based on the first one let view2 = new wijmo.CollectionView(view.items, { collectionChanged: (sender) => { let cnt = document.querySelector('#cnt'); cnt.textContent = wijmo.format('{length:n0}', sender.items); } }); // // show initial item count view2.onCollectionChanged(); // // bind a grid to the second CollectionView let theGrid = new grid.FlexGrid('#theGrid', { autoGenerateColumns: false, columns: [ { binding: 'id', header: 'ID', width: 80 }, { binding: 'country', header: '国' }, { binding: 'downloads', header: 'DL数', width: 80 }, { binding: 'sales', header: '売上', width: 80 }, { binding: 'expenses', header: '費用', width: 80 }, ], itemsSource: view2, alternatingRowStep: 0, headersVisibility: 'Column' }); // // add a filter to the grid (will act on the second CollectionView) var filter = new gridFilter.FlexGridFilter(theGrid); // // update the filter on the first CollectionView when the text changes document.querySelector('#theFilter').addEventListener('input', (e) => { // // update first CollectionView's filter let filterText = e.target.value.toLowerCase(); // view.filter = (item) => { return filterText ? item.country.toLowerCase().indexOf(filterText) > -1 : true; }; // // update second collection view's sourceCollection view2.sourceCollection = view.items; }); }
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>GrapeCity CollectionView Chaining Filters</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <!-- SystemJS --> <script src="node_modules/systemjs/dist/system.src.js"></script> <script src="systemjs.config.js"></script> <script> System.import('./src/app'); </script> </head> <body> <div class="container-fluid"> <div class="form-group row"> <div class="col-xs-4"> <input id="theFilter" name="filter" class="form-control" placeholder="国のフィルター" /> </div> </div> <p> 結果(<span id="cnt"></span>項目): </p> <div id="theGrid"> </div> </div> </body> </html>
// export function getData() { let countries = ['アメリカ', 'ドイツ', 'イギリス', '日本', 'イタリア', 'ギリシャ'], data = []; // for (let i = 0; i < 1000; i++) { data.push({ id: i, country: countries[i % countries.length], downloads: Math.round(Math.random() * 20000), sales: Math.random() * 10000, expenses: Math.random() * 5000 }); } // return data; }
.wj-flexgrid { max-height: 250px; } label { width: 100% }
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