CollectionView:動的な計算フィールド

CollectionView を使用すると、計算フィールドをデータソースに追加できます。

これは、calculatedFieldsプロパティを、計算フィールドの名前とフィールド値の取得に使用される関数を含む値に設定することによって行われます。

関数は、現在のデータ項目を引数として受け取る通常のJavaScript関数として、または現在のデータ項目を表す「$」値を持つ文字列式として指定できます。

計算フィールドは読み取り専用であり、依存フィールドが変更されると自動的に更新されます。

注意:IE11で計算フィールドを使用するには、次のようなプロキシポリフィルを含める必要があります。

https://www.npmjs.com/package/proxy-polyfill

import 'bootstrap.css'; import '@grapecity/wijmo.styles/wijmo-core.css'; import './styles.css'; import { FlexGrid } from '@grapecity/wijmo.grid'; import { getCalculatedView } from './data'; document.readyState === 'complete' ? init() : window.onload = init; function init() { // show a CollectionView with calculated fields on a grid new FlexGrid('#theGrid', { alternatingRowStep: 0, showMarquee: true, selectionMode: 'MultiRange', autoGenerateColumns: false, columns: [ // regular data fields { binding: 'product', header: '商品名', width: 80 }, { binding: 'origin', header: '産地名', width: 120 }, { binding: 'unitPrice', header: '単価', format: 'c', width: 80 }, { binding: 'qty', header: '注文数', format: 'n0', width: 80 }, { binding: 'discount', header: '割引率', format: 'p0', width: 80 }, // calculated fields { binding: 'fullName', header: 'フルネーム', cssClass: 'calculated', isReadOnly: true, width: 160 }, { binding: 'totalPrice', header: '合計', format: 'c', cssClass: 'calculated', width: 80 }, { binding: 'tax', header: '税額', format: 'c', cssClass: 'calculated', width: 80 } ], itemsSource: getCalculatedView() }); }
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>GrapeCity CollectionView Editing</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 id="theGrid"></div> </div> </body> </html>
import { CollectionView } from '@grapecity/wijmo'; export function getData() { return [ { product: 'バナナ', origin: 'フィリピン産', unitPrice: 300, qty: 12, discount: .08 }, { product: 'リンゴ', origin: 'アメリカ産', unitPrice: 200, qty: 23, discount: .02 }, { product: 'オレンジ', origin: 'ブラジル産', unitPrice: 150, qty: 16, discount: .04 }, { product: 'ブドウ', origin: '日本産', unitPrice: 600, qty: 8, discount: .0 }, { product: 'スイカ', origin: '中国産', unitPrice: 800, qty: 14, discount: .05 }, { product: 'マンゴー', origin: 'インド産', unitPrice: 450, qty: 19, discount: .15 }, ]; } export function getCalculatedView() { return new CollectionView(getData(), { calculatedFields: { // function-based expressions fullName: ($) => [$.origin, $.product].join(' '), totalPrice: ($) => ($.unitPrice * $.qty) * (1 - $.discount), tax: ($) => $.totalPrice * 0.12, // string-based expressions fullNameStr: '[$.origin, $.product].join(" ")', totalPriceStr: '($.unitPrice * $.qty) * (1 - $.discount)', taxStr: '$.totalPriceStr * 0.12', } }); }
.calculated { background-color: azure; }
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