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Multi Selection

Selection provides an interactive support and highlights the node that you select. Selection can be done through simple mouse down or keyboard interaction.

The TreeView also supports selection of multiple nodes by setting allowMultiSelection to true.

To multi-select, press and hold CTRL key and click the desired nodes. To select range of nodes, press and hold the SHIFT key and click the nodes.

In the following example, the allowMultiSelection property is enabled.

Multi selection is not applicable through touch interactions.

Source
Preview
app.component.ts
app.module.ts
main.ts
import { Component, ViewChild } from '@angular/core';

@Component({
    selector: 'app-container',
    // specifies the template string for the TreeView component
    template: `<div id='treeparent'><ejs-treeview id='treeelement' [fields]='field' [allowMultiSelection]='allowMultiSelection'></ejs-treeview></div>`
})
export class AppComponent {
    @ViewChild('samples')
    constructor() {
    }
    // defined the array of data
    public countries: Object[] = [
            { id: 1, name: 'Australia', hasChild: true, expanded: true },
            { id: 2, pid: 1, name: 'New South Wales', isSelected: true },
            { id: 3, pid: 1, name: 'Victoria' },
            { id: 4, pid: 1, name: 'South Australia' },
            { id: 6, pid: 1, name: 'Western Australia', isSelected: true },
            { 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' }
    ];
    // maps the appropriate column to fields property
    public field: Object = { dataSource: this.countries, id: 'id', parentID: 'pid', text: 'name', hasChildren: 'hasChild', selected: 'isSelected' };
    // set the Multi Selection option to TreeView
    public allowMultiSelection: boolean = true;
}
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 { }
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

Selected nodes

You can get or set the selected nodes in TreeView at initial rendering and dynamically by using the selectedNodes property. It will return the selected node’s ID as an array.

  • The nodeselecting event is triggered before a node is selected/unselected which can be used to prevent the selection.

  • The nodeSelected event is triggered once a node is successfully selected/unselected.

In the following example, New South Wales and Western Australia nodes are selected at initial rendering. When a node is selected, the selected node’s ID is displayed in alert.

Source
Preview
app.component.ts
app.module.ts
main.ts
import { Component, ViewChild } from '@angular/core';
import { TreeViewComponent, NodeSelectEventArgs } from '@syncfusion/ej2-angular-navigations';

@Component({
    selector: 'app-container',
    // specifies the template string for the TreeView component
    template: `<div id='treeparent'><ejs-treeview #tree id='treeelement' [fields]='field' [allowMultiSelection]='allowMultiSelection' [selectedNodes]='selectedNodes' (nodeSelected)='nodeSelected($event)'></ejs-treeview></div>`
})
export class AppComponent {
    @ViewChild('tree')
    public tree: TreeViewComponent;

    constructor() {
    }
    // defined the array of data
    public countries: Object[] = [
        { id: 1, name: 'Australia', hasChild: true, expanded: true },
        { id: 2, pid: 1, name: 'New South Wales', isSelected: true },
        { id: 3, pid: 1, name: 'Victoria' },
        { id: 4, pid: 1, name: 'South Australia' },
        { id: 6, pid: 1, name: 'Western Australia', isSelected: true },
        { 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' }
    ];
    // maps the appropriate column to fields property
    public field: Object = { dataSource: this.countries, id: 'id', parentID: 'pid', text: 'name', hasChildren: 'hasChild' };
    // set the Multi Selection option to the TreeView
    public allowMultiSelection: boolean = true;
    //set the Selected nodes to the TreeView
    public selectedNodes: string[] = ['2','6'];
    //Bind the nodeSelected event
    public nodeSelected(e: NodeSelectEventArgs) {
        alert("The selected node's id: " + this.tree.selectedNodes); // To alert the selected node's id.
    };
}
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 { }
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

See Also