Angular PrimeNG Tree Selection

Last Updated : 10 Oct, 2022

Angular PrimeNG is an open-source framework with a rich set of native Angular UI components that are used for great styling and this framework is used to make responsive websites with very much ease. This article will show us how to use Tree Selection in Angular PrimeNG.

Angular PrimeNG Tree Selection enables single and multiple nodes selection mode in the Tree component. So, using tree selection, we can make the tree more user-friendly and efficient.

Syntax:

<p-tree [value]="files1" selectionMode="..."> 
</p-tree>

Angular PrimeNG Tree Selection properties:

selectionMode: It is the selection mode by which we can selection the tree nodes.

Creating Angular application & Module Installation:

Step 1: Create an Angular application using the following command.

ng new appname

Step 2: After creating your project folder i.e. appname, move to it using the following command.

cd appname

Step 3: Install PrimeNG in your given directory.

npm install primeng --save
npm install primeicons --save

Project Structure: It will look like the following:

Example 1: Below is a simple example demonstrating the use of the Angular PrimeNG Tree Selection. In this example, we are applying single mode selection.

app.component.html

HTML

<h2 style="color: green">GeeksforGeeks</h2> 
<h4>Angular PrimeNG Tree Selection</h4> 
  
<p-tree [value]="files1" scrollHeight="flex" 
    selectionMode="single"> </p-tree>

app.component.ts

Javascript

import { Component, OnInit } from '@angular/core'; 
import { NodeService } from './nodeservice'; 
import { TreeNode } from 'primeng/api'; 
  
@Component({ 
    selector: 'app-root', 
    templateUrl: './app.component.html', 
}) 
export class AppComponent { 
    files1: TreeNode[] = []; 
  
    constructor(private nodeService: NodeService) { } 
  
    ngOnInit() { 
        this.files1 = [ 
            { label: 'Z', icon: 'pi pi-folder' }, 
            { label: 'A', icon: 'pi pi-folder' }, 
            { label: 'D', icon: 'pi pi-folder' }, 
            { label: 'C', icon: 'pi pi-folder' }, 
            { label: 'W', icon: 'pi pi-folder' }, 
            { label: 'E', icon: 'pi pi-folder' }, 
            { label: 'R', icon: 'pi pi-folder' }, 
            { label: 'G', icon: 'pi pi-folder' }, 
            { label: 'K', icon: 'pi pi-folder' }, 
  
            { 
                label: 'A', 
                icon: 'pi pi-folder', 
  
                children: [ 
                    { 
                        label: 'B', 
                        icon: 'pi pi-folder', 
  
                        children: [ 
                            { 
                                label: 'C', 
                                icon: 'pi pi-folder', 
                            }, 
                            { 
                                label: 'D', 
                                icon: 'pi pi-folder', 
                            }, 
                        ], 
                    }, 
                    { 
                        label: 'E', 
                        icon: 'pi pi-folder', 
  
                        children: [ 
                            { 
                                label: 'F', 
                                icon: 'pi pi-folder', 
                            }, 
                        ], 
                    }, 
                ], 
            }, 
            { 
                label: 'G', 
                icon: 'pi pi-folder', 
  
                children: [ 
                    { 
                        label: 'H', 
                        icon: 'pi pi-folder', 
                    }, 
                    { 
                        label: 'I', 
                        icon: 'pi pi-folder', 
                    }, 
                    { 
                        label: 'J', 
                        icon: 'pi pi-folder', 
                    }, 
                ], 
            }, 
        ]; 
    } 
}

app.module.ts

Javascript

import { NgModule } from '@angular/core'; 
import { BrowserModule } from '@angular/platform-browser'; 
import { FormsModule } from '@angular/forms'; 
import { HttpClientModule } from '@angular/common/http'; 
import { BrowserAnimationsModule } 
    from '@angular/platform-browser/animations'; 
import { AppComponent } from './app.component'; 
import { NodeService } from './nodeservice'; 
import { TreeModule } from 'primeng/tree'; 
import { ButtonModule } from 'primeng/button'; 
import { InputTextModule } from 'primeng/inputtext'; 
import { VirtualScrollerModule } 
    from 'primeng/virtualscroller'; 
import { DialogModule } from 'primeng/dialog'; 
  
@NgModule({ 
    imports: [ 
        BrowserModule, 
        BrowserAnimationsModule, 
        TreeModule, 
        ButtonModule, 
        InputTextModule, 
        HttpClientModule, 
        FormsModule, 
        VirtualScrollerModule, 
        DialogModule 
    ], 
    declarations: [AppComponent], 
    bootstrap: [AppComponent], 
    providers: [NodeService], 
}) 
export class AppModule { }

Output:

Example 2: Below is another example demonstrating the use of the Angular PrimeNG Tree Selection. In this example, we are applying multiple mode selection.

app.component.html

HTML

<h2 style="color: green">GeeksforGeeks</h2> 
<h4>Angular PrimeNG Tree Selection</h4> 
  
<p-tree [value]="files1" scrollHeight="flex" 
    selectionMode="multiple"> </p-tree>

app.component.ts

Javascript

import { Component, OnInit } from '@angular/core'; 
import { NodeService } from './nodeservice'; 
import { TreeNode } from 'primeng/api'; 
  
@Component({ 
    selector: 'app-root', 
    templateUrl: './app.component.html', 
}) 
export class AppComponent { 
    files1: TreeNode[] = []; 
  
    constructor(private nodeService: NodeService) { } 
  
    ngOnInit() { 
        this.files1 = [ 
            { label: 'Z', icon: 'pi pi-folder' }, 
            { label: 'A', icon: 'pi pi-folder' }, 
            { label: 'D', icon: 'pi pi-folder' }, 
            { label: 'C', icon: 'pi pi-folder' }, 
            { label: 'W', icon: 'pi pi-folder' }, 
            { label: 'E', icon: 'pi pi-folder' }, 
            { label: 'R', icon: 'pi pi-folder' }, 
            { label: 'G', icon: 'pi pi-folder' }, 
            { label: 'K', icon: 'pi pi-folder' }, 
  
            { 
                label: 'A', 
                icon: 'pi pi-folder', 
  
                children: [ 
                    { 
                        label: 'B', 
                        icon: 'pi pi-folder', 
  
                        children: [ 
                            { 
                                label: 'C', 
                                icon: 'pi pi-folder', 
                            }, 
                            { 
                                label: 'D', 
                                icon: 'pi pi-folder', 
                            }, 
                        ], 
                    }, 
                    { 
                        label: 'E', 
                        icon: 'pi pi-folder', 
  
                        children: [ 
                            { 
                                label: 'F', 
                                icon: 'pi pi-folder', 
                            }, 
                        ], 
                    }, 
                ], 
            }, 
            { 
                label: 'G', 
                icon: 'pi pi-folder', 
  
                children: [ 
                    { 
                        label: 'H', 
                        icon: 'pi pi-folder', 
                    }, 
                    { 
                        label: 'I', 
                        icon: 'pi pi-folder', 
                    }, 
                    { 
                        label: 'J', 
                        icon: 'pi pi-folder', 
                    }, 
                ], 
            }, 
        ]; 
    } 
}

app.module.ts

Javascript

import { NgModule } from '@angular/core'; 
import { BrowserModule } from '@angular/platform-browser'; 
import { FormsModule } from '@angular/forms'; 
import { HttpClientModule } from '@angular/common/http'; 
import { BrowserAnimationsModule }  
    from '@angular/platform-browser/animations'; 
import { AppComponent } from './app.component'; 
import { NodeService } from './nodeservice'; 
import { TreeModule } from 'primeng/tree'; 
import { ButtonModule } from 'primeng/button'; 
import { InputTextModule } from 'primeng/inputtext'; 
import { VirtualScrollerModule }  
    from 'primeng/virtualscroller'; 
import { DialogModule } from 'primeng/dialog'; 
  
@NgModule({ 
    imports: [ 
        BrowserModule, 
        BrowserAnimationsModule, 
        TreeModule, 
        ButtonModule, 
        InputTextModule, 
        HttpClientModule, 
        FormsModule, 
        VirtualScrollerModule, 
        DialogModule 
    ], 
    declarations: [AppComponent], 
    bootstrap: [AppComponent], 
    providers: [NodeService], 
}) 
export class AppModule { }

Output:

Example 3: Below is another example demonstrating the use of the Angular PrimeNG Tree Selection. In this example, we are applying selectionMode as checkbox.

app.component.html

HTML

<h2 style="color: green">GeeksforGeeks</h2> 
<h4>Angular PrimeNG Tree Selection</h4> 
  
<p-tree [value]="files1" scrollHeight="flex" 
    selectionMode="checkbox"> </p-tree>

app.component.ts

Javascript

import { Component, OnInit } from '@angular/core'; 
import { NodeService } from './nodeservice'; 
import { TreeNode } from 'primeng/api'; 
  
@Component({ 
    selector: 'app-root', 
    templateUrl: './app.component.html', 
}) 
export class AppComponent { 
    files1: TreeNode[] = []; 
  
    constructor(private nodeService: NodeService) { } 
  
    ngOnInit() { 
        this.files1 = [ 
            { label: 'Z', icon: 'pi pi-folder' }, 
            { label: 'A', icon: 'pi pi-folder' }, 
            { label: 'D', icon: 'pi pi-folder' }, 
            { label: 'C', icon: 'pi pi-folder' }, 
            { label: 'W', icon: 'pi pi-folder' }, 
            { label: 'E', icon: 'pi pi-folder' }, 
            { label: 'R', icon: 'pi pi-folder' }, 
            { label: 'G', icon: 'pi pi-folder' }, 
            { label: 'K', icon: 'pi pi-folder' }, 
  
            { 
                label: 'A', 
                icon: 'pi pi-folder', 
  
                children: [ 
                    { 
                        label: 'B', 
                        icon: 'pi pi-folder', 
  
                        children: [ 
                            { 
                                label: 'C', 
                                icon: 'pi pi-folder', 
                            }, 
                            { 
                                label: 'D', 
                                icon: 'pi pi-folder', 
                            }, 
                        ], 
                    }, 
                    { 
                        label: 'E', 
                        icon: 'pi pi-folder', 
  
                        children: [ 
                            { 
                                label: 'F', 
                                icon: 'pi pi-folder', 
                            }, 
                        ], 
                    }, 
                ], 
            }, 
            { 
                label: 'G', 
                icon: 'pi pi-folder', 
  
                children: [ 
                    { 
                        label: 'H', 
                        icon: 'pi pi-folder', 
                    }, 
                    { 
                        label: 'I', 
                        icon: 'pi pi-folder', 
                    }, 
                    { 
                        label: 'J', 
                        icon: 'pi pi-folder', 
                    }, 
                ], 
            }, 
        ]; 
    } 
}

app.module.ts

Javascript

import { NgModule } from '@angular/core'; 
import { BrowserModule } from '@angular/platform-browser'; 
import { FormsModule } from '@angular/forms'; 
import { HttpClientModule } from '@angular/common/http'; 
import { BrowserAnimationsModule }  
    from '@angular/platform-browser/animations'; 
import { AppComponent } from './app.component'; 
import { NodeService } from './nodeservice'; 
import { TreeModule } from 'primeng/tree'; 
import { ButtonModule } from 'primeng/button'; 
import { InputTextModule } from 'primeng/inputtext'; 
import { VirtualScrollerModule }  
    from 'primeng/virtualscroller'; 
import { DialogModule } from 'primeng/dialog'; 
  
@NgModule({ 
    imports: [ 
        BrowserModule, 
        BrowserAnimationsModule, 
        TreeModule, 
        ButtonModule, 
        InputTextModule, 
        HttpClientModule, 
        FormsModule, 
        VirtualScrollerModule, 
        DialogModule 
    ], 
    declarations: [AppComponent], 
    bootstrap: [AppComponent], 
    providers: [NodeService], 
}) 
export class AppModule { }