Calculated Fields (Vue)

The CollectionView allows you to add calculated fields to your data sources.

This is done by setting the calculatedFields property to a value that contains the names of the calculated fields and functions used to get the field values.

The functions may be specified as regular JavaScript functions that take the current data item as argument or as string expressions with an "$" value that represents the current data item.

Calculated fields are read-only and are automatically updated their dependent fields change.

Note: To use calculated fields in IE11, you must include a proxy polyfill such as https://www.npmjs.com/package/proxy-polyfill.

This example uses Vue.

<template> <div class="container-fluid"> <wj-flex-grid :alternatingRowStep="0" :showMarquee="true" selectionMode="MultiRange" :autoGenerateColumns="false" :itemsSource="view"> <!-- regular fields --> <wj-flex-grid-column binding="product" header="Product" /> <wj-flex-grid-column binding="brand" header="Brand" /> <wj-flex-grid-column binding="unitPrice" header="Unit Price" format="c" /> <wj-flex-grid-column binding="qty" header="Quantity" format="n0" /> <wj-flex-grid-column binding="discount" header="Discount" format="p0" /> <!-- calculated fields --> <wj-flex-grid-column binding="fullName" header="Full Name" cssClass="calculated" /> <wj-flex-grid-column binding="allCaps" header="Uppercase" cssClass="calculated" /> <wj-flex-grid-column binding="totalPrice" header="Total Price" format="c" cssClass="calculated" /> <wj-flex-grid-column binding="tax" header="Tax Amount" format="c" cssClass="calculated" /> </wj-flex-grid> </div> </template> <script> import "bootstrap.css"; import "@grapecity/wijmo.styles/wijmo.css"; import Vue from "vue"; import "@grapecity/wijmo.vue2.grid"; import * as wijmo from "@grapecity/wijmo"; import { getCalculatedView } from "./data"; let App = Vue.extend({ name: "app", data: function() { return { view: getCalculatedView() }; } }); new Vue({ render: h => h(App) }).$mount("#app"); </script> <style scoped> .wj-cell.calculated { background-color: azure; } </style>
<!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.vue'); </script> </head> <body> <div id="app"> </div> </body> </html>
import { CollectionView } from '@grapecity/wijmo'; // some raw data 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 }, ]; } // add calculated fields 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 - $.discount)', taxStr: '$.totalPrice * 0.12', } }); }
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