Disable checkbox of the tree node in Angular Treeview component

28 Sep 20235 minutes to read

You can disable the check box alone in TreeView instead of disabling the whole node. You need to include the e-checkbox-disabled class into the check box element using the drawNode event. Please refer to the following sample to disable the check box of the tree nodes.

app.component.ts

import { Component, Inject, ViewChild } from '@angular/core';
import { TreeViewComponent, DrawNodeEventArgs } from '@syncfusion/ej2-angular-navigations';
/**
 * Treeview Disable check box of parent nodes sample
 */
@Component({
    selector: 'app-container',
    template: `<div id='treeparent'><ejs-treeview id='treeElement' #treevalidate [fields]='field'  (drawNode)='drawNode($event)' [showCheckBox]=true></ejs-treeview></div>`
})
export class AppComponent {

   // Data source for TreeView component
   public Countries: Object[] = [
    { id: 1, name: 'India', hasChild: true, expanded: true },
    { id: 2, pid: 1, name: 'Assam' },
    { id: 3, pid: 1, name: 'Bihar' },
    { id: 4, pid: 1, name: 'Tamil Nadu' },
    { id: 6, pid: 1, name: 'Punjab' },
    { 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: 'France', hasChild: true },
    { id: 12, pid: 11, name: 'Pays de la Loire' },
    { id: 13, pid: 11, name: 'Aquitaine' },
    { id: 14, pid: 11, name: 'Brittany' },
    { id: 15, pid: 11, name: 'Lorraine' },
    { id: 16, name: 'Australia', hasChild: true },
    { id: 17, pid: 16, name: 'New South Wales' },
    { id: 18, pid: 16, name: 'Victoria' },
    { id: 19, pid: 16, name: 'South Australia' },
    { id: 20, pid: 16, name: 'Western Australia' },
    { id: 21, name: 'China', hasChild: true },
    { id: 22, pid: 21, name: 'Guangzhou' },
    { id: 23, pid: 21, name: 'Shanghai' },
    { id: 24, pid: 21, name: 'Beijing' },
    { id: 25, pid: 21, name: 'Shantou' }
   ]

    public field:Object ={  dataSource: this.Countries, id: 'id', text: 'name', parentID: 'pid', hasChildren: 'hasChild' };

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

    // Disables the checkbox alone in treeview
    public drawNode(args: DrawNodeEventArgs): void {
      let ele: HTMLElement = args.node.querySelector('.e-checkbox-wrapper') as HTMLElement;
      ele.classList.add('e-checkbox-disabled');
    }
}

app.module.ts

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule } from '@angular/forms';
import { AppComponent } from './app.component';
import { TreeViewModule } from '@syncfusion/ej2-angular-navigations';
/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule,FormsModule,TreeViewModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent]
})
export class AppModule { }

main.ts

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

import 'zone.js';
enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);