Tracking Changings in CollectionView (Angular)

The CollectionView can help by keeping track of modified items when the trackChanges property is set to true. When enabled, the CollectionView updates the itemsAdded, itemsRemoved, and itemsEdited collections as content is edited. This sample displays these collections in separate grids to show how the changes are tracked.

Learn about FlexGrid | Editing Views Documentation | CollectionView API Reference

This example uses Angular.

import 'bootstrap.css'; import '@mescius/wijmo.styles/wijmo.css'; import './styles.css'; import * as wijmo from '@mescius/wijmo'; import '@angular/compiler'; import { Component, Inject, enableProdMode, ɵresolveComponentResources } from '@angular/core'; import { BrowserModule, bootstrapApplication } from '@angular/platform-browser'; import { WjGridModule } from '@mescius/wijmo.angular2.grid'; import { DataService } from './app.data'; @Component({ standalone: true, providers: [DataService], imports: [WjGridModule, BrowserModule], selector: 'app-component', templateUrl: 'src/app.component.html', }) export class AppComponent { view: wijmo.CollectionView; constructor(@Inject(DataService) private dataService: DataService) { this.view = new wijmo.CollectionView(dataService.getData(), { sortDescriptions: ['country'], trackChanges: true, }); } } enableProdMode(); // Resolve resources (templateUrl, styleUrls etc), After resolution all URLs have been converted into `template` strings. ɵresolveComponentResources(fetch).then(() => { // Bootstrap application bootstrapApplication(AppComponent).catch((err) => console.error(err)); });
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>MESCIUS Wijmo CollectionView Change Tracking</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <!-- Polyfills --> <script src="node_modules/core-js/client/shim.min.js"></script> <script src="node_modules/zone.js/fesm2015/zone.min.js"></script> <!-- 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> // workaround to load 'rxjs/operators' from the rxjs bundle System.import('rxjs').then(function (m) { System.set(SystemJS.resolveSync('rxjs/operators'), System.newModule(m.operators)); System.import('./src/app.component'); }); </script> </head> <body> <app-component></app-component> </body> </html>
<div class="container-fluid"> <div class="row"> <div class="col-xs-6"> <wj-flex-grid [itemsSource]="view" [allowAddNew]="true" [allowDelete]="true"> </wj-flex-grid> </div> <div class="col-xs-6"> <h4>Edited Items:</h4> <wj-flex-grid class="changed edited" [itemsSource]="view.itemsEdited" [isReadOnly]="true"> </wj-flex-grid> <h4>Added Items:</h4> <wj-flex-grid class="changed added" [itemsSource]="view.itemsAdded" [isReadOnly]="true"> </wj-flex-grid> <h4>Removed Items:</h4> <wj-flex-grid class="changed removed" [itemsSource]="view.itemsRemoved" [isReadOnly]="true"> </wj-flex-grid> </div> </div> </div>
import { Injectable } from '@angular/core'; // @Injectable() export class DataService { getData() { let countries = ['US', 'Germany', 'UK', 'Japan', 'Italy'], data = []; for (let i = 0; i < countries.length; i++) { data.push({ country: countries[i], downloads: Math.round(Math.random() * 20000), sales: Math.random() * 10000, expenses: Math.random() * 5000 }); } return data; } }
.wj-flexgrid:not(.changed) { height: 300px; } .changed { font-size: 90%; background-color: #f0f0f0 } .edited { color: orange } .added { color: green } .removed { color: red }
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'npm:@angular/forms/fesm2022/forms.mjs', }, // packages tells the System loader how to load when no filename and/or no extension packages: { "./src": { defaultExtension: 'ts' }, "node_modules": { defaultExtension: 'js' }, wijmo: { defaultExtension: 'js', } } }); })(this);