グリッド:動的なデータマップ

セルの有効な値のリストがセルがバインドされているデータ項目に依存する場合、DataMapを作成し、getDisplayValuesメソッドをオーバーライドして完全な値リストのサブセットを返すことができます。

たとえば、下のグリッドは、国と都市を含むデータ項目のリストを示しています。 ドロップダウン都市リストには、データ項目の国の都市のみが含まれます。

import 'bootstrap.css'; import '@mescius/wijmo.styles/wijmo.css'; import './styles.css'; import '@mescius/wijmo.input'; import { FlexGrid, DataMap } from '@mescius/wijmo.grid'; document.readyState === 'complete' ? init() : window.onload = init; function init() { // create data maps var countryMap = new DataMap(getCountries(), 'id', 'name'); var cityMap = new DataMap(getCities(), 'id', 'name'); // override cityMap's getDisplayValues method to get cities that // correspond to the current item's country cityMap.getDisplayValues = function (dataItem) { let validCities = getCities().filter(city => city.country == dataItem.country); return validCities.map(city => city.name); }; // create and bind the grid var theGrid = new FlexGrid('#theGrid', { autoGenerateColumns: false, columns: [ { binding: 'country', header: '国', dataMap: countryMap }, { binding: 'city', header: '都市', dataMap: cityMap }, { binding: 'downloads', header: 'DL数', format: 'n0' }, { binding: 'sales', header: '売上', format: 'n0' } ], itemsSource: getData() }); // create some random data function getData() { var cities = getCities(), data = []; for (var i = 0; i < cities.length; i++) { data.push({ country: cities[i].country, city: cities[i].id, downloads: Math.round(Math.random() * 20000), sales: Math.random() * 10000, expenses: Math.random() * 5000 }); } return data; } function getCountries() { return [ { id: 0, name: 'アメリカ' }, { id: 1, name: 'ドイツ' }, { id: 2, name: 'イギリス' }, { id: 3, name: '日本' }, { id: 4, name: 'イタリア' }, { id: 5, name: 'ギリシャ' } ]; } function getCities() { return [ { id: 0, country: 0, name: 'ワシントン' }, { id: 1, country: 0, name: 'マイアミ' }, { id: 2, country: 0, name: 'シアトル' }, { id: 3, country: 1, name: 'ボン' }, { id: 4, country: 1, name: 'ミュンヘン' }, { id: 5, country: 1, name: 'ベルリン' }, { id: 6, country: 2, name: 'ロンドン' }, { id: 7, country: 2, name: 'オックスフォード' }, { id: 8, country: 2, name: 'マンチェスター' }, { id: 9, country: 3, name: '東京' }, { id: 10, country: 3, name: '仙台' }, { id: 11, country: 3, name: '神戸' }, { id: 12, country: 4, name: 'ローマ' }, { id: 13, country: 4, name: 'フィレンツェ' }, { id: 14, country: 4, name: 'ミラノ' }, { id: 15, country: 5, name: 'アテネ' }, { id: 16, country: 5, name: 'サントリーニ' }, { id: 17, country: 5, name: 'テーベ' } ]; } }
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>MESCIUS Wijmo FlexGrid Column Dynamic DataMaps</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <!-- SystemJS --> <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.21.5/system.src.js" integrity="sha512-skZbMyvYdNoZfLmiGn5ii6KmklM82rYX2uWctBhzaXPxJgiv4XBwJnFGr5k8s+6tE1pcR1nuTKghozJHyzMcoA==" crossorigin="anonymous"></script> <script src="systemjs.config.js"></script> <script> System.import('./src/app'); </script> </head> <body> <div class="container-fluid"> <div id="theGrid"></div> </div> </body> </html>
.wj-flexgrid { max-height: 200px; margin: 12px 0; }
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