Checkbox-based Selection (Angular)

Use FlexGrid's Selector class to add a checkbox-based scheme for row selection.

This selection scheme works great on mobile devices, which have no keyboards with shift and control keys which are normally used to create extended selections.

The Selector class works with flat and hierarchical views. When used with hierarchical views, users can toggle the selected state for entire groups at once.

The Selector class can be used on header columns as well as on regular scrollable/data columns.

Learn about FlexGrid | FlexGrid API Reference

This example uses Angular.

import 'bootstrap.css'; import '@mescius/wijmo.styles/wijmo.css'; import './styles.css'; import '@angular/compiler'; import { Component, enableProdMode, Inject, ɵresolveComponentResources } from '@angular/core'; import { FormsModule } from '@angular/forms'; import { BrowserModule, bootstrapApplication } from '@angular/platform-browser'; import { WjGridModule } from '@mescius/wijmo.angular2.grid'; import { CollectionView, PropertyGroupDescription} from '@mescius/wijmo'; import { FlexGrid, HeadersVisibility } from '@mescius/wijmo.grid'; import { Selector } from '@mescius/wijmo.grid.selector'; import { getData } from './app.data'; @Component({ standalone: true, imports: [WjGridModule, FormsModule, BrowserModule], selector: 'app-component', templateUrl: 'src/app.component.html' }) export class AppComponent { view = new CollectionView(getData(30)); grouped = true; headers = true; selectedItems: any[] = []; selector: Selector = null; initGrid(grid: FlexGrid) { this.setGroups(true); this.selector = new Selector(grid, { itemChecked: () => { this.selectedItems = grid.rows.filter(r => r.isSelected); } }); } setGroups(groupsOn: boolean) { let groups = this.view.groupDescriptions; groups.clear(); if (groupsOn) { groups.push( new PropertyGroupDescription('country'), new PropertyGroupDescription('product') ); } this.grouped = groupsOn; } setHeaders(headersOn: boolean) { let theGrid = this.selector.column.grid; theGrid.headersVisibility = headersOn ? HeadersVisibility.All : HeadersVisibility.Column; this.selector.column = headersOn ? theGrid.rowHeaders.columns[0] : theGrid.columns[0]; this.headers = headersOn; } } 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 FlexGrid Selector: Checkbox Selection</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"> <label> Grouped Data <input #groupedCheckbox type="checkbox" [checked]="grouped" (change)="setGroups(groupedCheckbox.checked)"/> </label> <label> Header Column <input #headersCheckbox type="checkbox" [checked]="headers" (change)="setHeaders(headersCheckbox.checked)"/> </label> <p> There are now <b>{{selectedItems.length}}</b> items selected. </p> <wj-flex-grid #flex [deferResizing]="true" [showMarquee]="true" [alternatingRowStep]="0" [(itemsSource)]="view" (initialized)="initGrid(flex)"> <wj-flex-grid-column binding="id" header="ID" [isReadOnly]="true"></wj-flex-grid-column> <wj-flex-grid-column binding="country" header="Country"></wj-flex-grid-column> <wj-flex-grid-column binding="product" header="Product"></wj-flex-grid-column> <wj-flex-grid-column binding="discount" header="Discount" format="p0"></wj-flex-grid-column> <wj-flex-grid-column binding="downloads" header="Downloads"></wj-flex-grid-column> <wj-flex-grid-column binding="sales" header="Sales"></wj-flex-grid-column> <wj-flex-grid-column binding="expenses" header="Expenses"></wj-flex-grid-column> </wj-flex-grid> </div>
export function getData(count: number): any[] { var countries = 'US,Germany,UK,Japan,Italy,Greece'.split(','), products = 'Widgets,Gadgets,Yahoos'.split(','), data = []; for (var i = 0; i < count; i++) { var item = { id: i, country: pickOne(countries), product: pickOne(products), discount: Math.random() * .3, downloads: Math.round(Math.random() * 200000), sales: Math.random() * 100000, expenses: Math.random() * 50000 }; data.push(item); } return data; } function pickOne(items: any[]): any { return items[randBetween(0, items.length - 1)]; } function randBetween(min: number, max: number): number { return Math.floor(Math.random() * (max - min + 1) + min); }
/* fixed grid height */ .wj-flexgrid { height: 350px; } /* some extra cell padding */ .wj-flexgrid .wj-cell { padding: 8px; } /* some space after the labels */ label { margin-right: 4em; }
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packages: { "./src": { defaultExtension: 'ts' }, "node_modules": { defaultExtension: 'js' }, wijmo: { defaultExtension: 'js', } } }); })(this);