Check uncheck the checkbox on clicking the tree node text in Angular Treeview component

27 Apr 20246 minutes to read

You can check and uncheck the checkboxes of tree view by clicking the tree node using the nodeClicked event of TreeView.

app.component.ts

import { NgModule } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { FormsModule } from '@angular/forms'
import { TreeViewModule } from '@syncfusion/ej2-angular-navigations'
import { NodeKeyPressEventArgs, NodeClickEventArgs } from '@syncfusion/ej2-navigations';
import { Component, ViewChild } from '@angular/core';
import { TreeViewComponent } from '@syncfusion/ej2-angular-navigations';
/**
 * TreeView Checkboxes sample
 */
@Component({
imports: [
        FormsModule,TreeViewModule
    ],


standalone: true,
    selector: 'app-container',
    template: `<div id='treeparent'><ejs-treeview id='treeElement' #treevalidate [fields]='field' [showCheckBox]='showCheckBox' (nodeClicked)='nodeCheck($event)' (keyPress)='nodeCheck($event)'></ejs-treeview></div>`
})
export class AppComponent {

   // Data source for TreeView component
   public countries: Object[] = [
        { id: 1, name: 'Australia', hasChild: true, expanded: true },
        { id: 2, pid: 1, name: 'New South Wales' },
        { id: 3, pid: 1, name: 'Victoria' },
        { id: 4, pid: 1, name: 'South Australia' },
        { id: 6, pid: 1, name: 'Western Australia' },
        { id: 7, name: 'Brazil', hasChild: true },
        { id: 8, pid: 7, name: 'Paraná' },
        { id: 9, pid: 7, name: 'Ceará' },
        { id: 10, pid: 7, name: 'Acre' },
        { id: 11, name: 'China', hasChild: true },
        { id: 12, pid: 11, name: 'Guangzhou' },
        { id: 13, pid: 11, name: 'Shanghai' },
        { id: 14, pid: 11, name: 'Beijing' },
        { id: 15, pid: 11, name: 'Shantou' },
        { id: 16, name: 'France', hasChild: true },
        { id: 17, pid: 16, name: 'Pays de la Loire' },
        { id: 18, pid: 16, name: 'Aquitaine' },
        { id: 19, pid: 16, name: 'Brittany' },
        { id: 20, pid: 16, name: 'Lorraine' },
        { id: 21, name: 'India', hasChild: true },
        { id: 22, pid: 21, name: 'Assam' },
        { id: 23, pid: 21, name: 'Bihar' },
        { id: 24, pid: 21, name: 'Tamil Nadu' },
        { id: 25, pid: 21, name: 'Punjab' }
    ];
    public field:Object ={ dataSource: this.countries, id: 'id', parentID: 'pid', text: 'name', hasChildren: 'hasChild' };
    // Enable the checkbox for TreeView
    public showCheckBox:boolean = true;

    @ViewChild ('treevalidate') treevalidate?: TreeViewComponent;

    public nodeCheck(args: NodeKeyPressEventArgs | NodeClickEventArgs | any): void {
      let checkedNode: any = [args.node];
      if ((args.event.target as EventTarget | any).classList.contains('e-fullrow') || args.event.key == "Enter") {
        let getNodeDetails: any = (this.treevalidate as TreeViewComponent ).getNode(args.node);
        if (getNodeDetails.isChecked == 'true') {
          (this.treevalidate as TreeViewComponent ).uncheckAll(checkedNode);
        } else {
          (this.treevalidate as TreeViewComponent ).checkAll(checkedNode);
        }
      }
    }
}

main.ts

import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));