Check uncheck the checkbox on click the tree node text in Angular TreeView component

7 Jan 20255 minutes to read

You can check and uncheck the checkboxes of the TreeView 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));