Angular PrimeNG OrganizationChart Events

Last Updated : 26 Apr, 2025

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. It provides a lot of templates, components, theme design, an extensive icon library, and much more. In this article, we will see the Angular PrimeNG OrganizationChart Events.

The OrganizationChart Component visualizes the data in hierarchical organizational data. The data is arranged in the tree format. The component provides a lot of properties, styling, events, templates, etc. which can be modified to create many variations.

Events: This component provides the different events that enable the various functionalities of the OrganizationChart, along with enhancing the overall user experience.

Angular PrimeNG OrganizationChart Events:

onNodeSelect: It is a callback function that is invoked when a node is selected.
onNodeUnselect: It is a callback function that is invoked when a node is unselected.
onNodeExpand: It is a callback function that is invoked when a node is expanded.
onNodeCollapse: It is a callback function that is invoked when a node is collapsed.

Creating Angular application & Module Installation:

Create an Angular application using the following command.

ng new geeks_angular

After creating your project folder i.e. geeks_angular, move to it using the following command.

cd geeks_angular

Install PrimeNG in your given directory.

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

Project Structure: The project structure will look like the following:

Steps to run the application: Run the below command to see the output:

ng serve --save

Example 1: Below is the example that illustrates the use of the Angular PrimeNG OrganizationChart Events using onNodeSelect.

app.component.html:

HTML

<h1 style="color: green; text-align:center;"> 
      GeeksforGeeks 
</h1> 
<h3>Angular PrimeNG OrganizationChart Events</h3> 
<p-toast [style]="{marginTop: '90px'}"></p-toast> 
  
<p-organizationChart [value]="GfG"  
     selectionMode="single" 
     [(selection)]="selectedNode"  
     (onNodeSelect)="onNodeSelect($event)"> 
    <ng-template let-node pTemplate="default"> 
        <span style="color:green"> 
            {{ node.label }} 
        </span> 
    </ng-template> 
</p-organizationChart>

app.component.ts:

Javascript

import { Component } from '@angular/core'; 
import { TreeNode } from 'primeng/api'; 
import { MessageService } from 'primeng/api'; 
  
@Component({ 
    selector: 'app-root', 
    templateUrl: './app.component.html', 
    providers: [MessageService], 
}) 
  
export class AppComponent { 
    GfG: TreeNode[]; 
  
    constructor(private messageService: MessageService) { } 
  
    ngOnInit() { 
        this.GfG = [ 
            { 
                label: 'Data Structures and Algorithms', 
                expanded: true, 
                children: [ 
                    { 
                        label: 'Data Structures', 
                        expanded: true, 
                        children: [ 
                            { 
                                label: 'Queue', type: 'gfg'
                            }, 
                            { 
                                label: 'Red-Black Tree', type: 'gfg'
                            }, 
                        ], 
                    }, 
                    { 
                        label: 'Algorithms', 
                        expanded: true, 
                        children: [ 
                            { 
                                label: 'Hashing', type: 'gfg'
                            }, 
                            { 
                                label: 'Divide and Conquer', type: 'gfg'
                            }, 
                        ], 
                    }, 
                ], 
            }, 
        ]; 
    } 
  
    onNodeSelect(event) { 
        this.messageService.add( 
            { 
                severity: 'success',  
                summary: 'Node Selected',  
                detail: event.node.label 
            } 
        ); 
    } 
}

app.module.ts:

Javascript

import { NgModule } from '@angular/core'; 
import { BrowserModule } 
    from '@angular/platform-browser'; 
import { FormsModule } from '@angular/forms'; 
import { BrowserAnimationsModule } 
    from '@angular/platform-browser/animations'; 
import { AppComponent } 
    from './app.component'; 
import { OrganizationChartModule } 
    from 'primeng/organizationchart'; 
import { ToastModule } from 'primeng/toast'; 
import { PanelModule } from 'primeng/panel'; 
  
@NgModule({ 
    imports: [ 
        BrowserModule, 
        BrowserAnimationsModule, 
        OrganizationChartModule, 
        ToastModule, 
        PanelModule, 
        FormsModule 
    ], 
    declarations: [AppComponent], 
    bootstrap: [AppComponent] 
}) 
  
export class AppModule { }

Output:

Example 2: Below is another example that illustrates the use of the Angular PrimeNG OrganizationChart Events using onNodeExpand.

app.component.html:

HTML

<h1 style="color: green; text-align:center;"> 
    GeeksforGeeks 
</h1> 
<h3>Angular PrimeNG OrganizationChart Events</h3> 
<p-toast [style]="{marginTop: '90px'}"></p-toast> 
  
<p-organizationChart [value]="GfG"  
    selectionMode="single" 
    [(selection)]="selectedNode"  
    (onNodeExpand)="onNodeExpand($event)"> 
    <ng-template let-node pTemplate="default"> 
        <span style="color:green"> 
            {{ node.label }} 
        </span> 
    </ng-template> 
</p-organizationChart>

app.component.ts:

Javascript

import { Component } from '@angular/core'; 
import { TreeNode } from 'primeng/api'; 
import { MessageService } from 'primeng/api'; 
  
@Component({ 
    selector: 'app-root', 
    templateUrl: './app.component.html', 
    providers: [MessageService], 
}) 
  
export class AppComponent { 
    GfG: TreeNode[]; 
  
    constructor(private messageService: MessageService) { } 
  
    ngOnInit() { 
        this.GfG = [ 
            { 
                label: 'Data Structures and Algorithms', 
                expanded: true, 
                children: [ 
                    { 
                        label: 'Data Structures', 
                        expanded: true, 
                        children: [ 
                            { 
                                label: 'Queue', type: 'gfg'
                            }, 
                            { 
                                label: 'Red-Black Tree', type: 'gfg'
                            }, 
                        ], 
                    }, 
                    { 
                        label: 'Algorithms', 
                        expanded: true, 
                        children: [ 
                            { 
                                label: 'Hashing', type: 'gfg'
                            }, 
                            { 
                                label: 'Divide and Conquer', type: 'gfg'
                            }, 
                        ], 
                    }, 
                ], 
            }, 
        ]; 
    } 
  
    onNodeExpand(event) { 
        this.messageService.add( 
            { 
                severity: 'warn',  
                summary: 'Node Expanded',  
                detail: event.node.label 
            } 
        ); 
    } 
}

app.module.ts:

Javascript

import { NgModule } from '@angular/core'; 
import { BrowserModule } 
    from '@angular/platform-browser'; 
import { FormsModule } from '@angular/forms'; 
import { BrowserAnimationsModule } 
    from '@angular/platform-browser/animations'; 
import { AppComponent } 
    from './app.component'; 
import { OrganizationChartModule } 
    from 'primeng/organizationchart'; 
import { ToastModule } from 'primeng/toast'; 
import { PanelModule } from 'primeng/panel'; 
  
@NgModule({ 
    imports: [ 
        BrowserModule, 
        BrowserAnimationsModule, 
        OrganizationChartModule, 
        ToastModule, 
        PanelModule, 
        FormsModule 
    ], 
    declarations: [AppComponent], 
    bootstrap: [AppComponent] 
}) 
  
export class AppModule { }