계산된 필드(Calculated Fields)

CollectionView를 사용하면 계산 된 필드를 데이터 원본에 추가 할 수 있습니다.

계산된 필드의 이름과 필드 값을 가져 오는 데 사용되는 함수를 포함하는 값으로 calculatedFields 속성을 설정하면됩니다.

함수는 현재 데이터 항목을 인수로 사용하는 일반 JavaScript 함수 또는 현재 데이터 항목을 나타내는 "$"값이있는 문자열 식으로 지정될 수 있습니다.

계산 된 필드는 읽기 전용이며 종속 필드 변경 사항이 자동으로 업데이트됩니다.

참고 : IE11에서 계산 된 필드를 사용하려면 https://www.npmjs.com/package/proxy-polyfill과 같은 프록시 폴리 필을 포함해야합니다.

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: 'Product' }, { binding: 'brand', header: 'Brand' }, { binding: 'unitPrice', header: 'Unit Price', format: 'c' }, { binding: 'qty', header: 'Quantity', format: 'n0' }, { binding: 'discount', header: 'Discount', format: 'p0' }, // calculated fields { binding: 'fullName', header: 'Full Name', cssClass: 'calculated' }, { binding: 'allCaps', header: 'Uppercase', cssClass: 'calculated' }, { binding: 'totalPrice', header: 'Total Price', format: 'c', cssClass: 'calculated' }, { binding: 'tax', header: 'Tax Amount', format: 'c', cssClass: 'calculated' } ], 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: 'Banana', brand: 'Chiquita', unitPrice: 45.95, qty: 12, discount: .08 }, { product: 'Apple', brand: 'Granny', unitPrice: 65.95, qty: 23, discount: .02 }, { product: 'Orange', brand: 'Sunkist', unitPrice: 52.95, qty: 16, discount: .04 }, { product: 'Grape', brand: 'Pinot', unitPrice: 83.95, qty: 8, discount: .0 }, { product: 'Watermelon', brand: '', unitPrice: 13.95, qty: 14, discount: .05 }, { product: 'Mango', brand: 'Ganesh', unitPrice: 38.95, qty: 19, discount: .15 }, ]; } export function getCalculatedView() { return new CollectionView(getData(), { calculatedFields: { // function-based expressions fullName: ($) => [$.brand, $.product].join(' '), allCaps: ($) => $.fullName.toUpperCase(), totalPrice: ($) => ($.unitPrice * $.qty) * (1 - $.discount), tax: ($) => $.totalPrice * 0.12, // string-based expressions fullNameStr: '[$.brand, $.product].join(" ")', allCapsStr: '$.fullNameStr.toUpperCase()', totalPriceStr: '($.unitPrice * $.qty) * (1 - $.discount)', taxStr: '$.totalPriceStr * 0.12', } }); }
.calculated { background-color: azure; }
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