CollectionView Filtering

The CollectionView has a filter property that can be used to specify a filter function. The filter function defines which items should be included in the view when the filter is applied. The sample below provides some predefined 'select' filters defined by the filter function.

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 { getData } from './data'; // document.readyState === 'complete' ? init() : window.onload = init; // function init() { // create a CollectionView let view = new wijmo.CollectionView(getData()); // // show filtered item count view.collectionChanged.addHandler(() => { let cnt = document.getElementById('cnt'); cnt.textContent = wijmo.format('{length:n0}', view.items); }); // // initialize item count display view.onCollectionChanged(); // // show the data in a grid let flex = new grid.FlexGrid('#theGrid', { itemsSource: view, alternatingRowStep: 0, headersVisibility: 'Column' }); // // change the filter document.addEventListener('change', e => { let filterType = e.target.value; // view.filter = (item) => { switch (filterType) { case 'country': return item.country == 'US'; case 'sales': return item.sales > 9000; case 'downloads': return item.downloads > 19000; default: return true; } }; }); }
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>GrapeCity CollectionView Filtering Overview</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"> <label> <input type="radio" name="filter" value="" checked="true" /> No Filter </label> <label> <input type="radio" name="filter" value="country" /> US only </label> <label> <input type="radio" name="filter" value="sales" /> Sales > 9,000 </label> <label> <input type="radio" name="filter" value="downloads" /> Downloads > 19,000 </label> <p> Result (<span id="cnt"></span> items): </p> <div id="theGrid"> </div> </div> </body> </html>
// export function getData() { let countries = ['US', 'Germany', 'UK', 'Japan', 'Italy', 'Greece'], 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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