Angular PrimeNG Accordion Tab Change Event

Last Updated : 28 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. In this article, we will learn about the Angular PrimeNG Accordion Tab Change Event.

The Accordion Component is used to display a section of custom content in tabs. The selected property that is set true, which allows either one-way binding or two-way binding, specifies the content’s visibility.

Angular PrimeNG Accordion Tab Change Event:

onClose: It is invoked when an active tab is collapsed by clicking on the header.
onOpen: It is invoked when a tab gets expanded.

Syntax:

<p-accordion 
    (event)=function()>
    ...
</p-accordion>

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:

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

ng serve --save

Example 1: Below is the basic example code that illustrates the use of Angular PrimenNG Accordion Tab Change. In this example, we will learn about the onClose event

app.component.html:

HTML

<div style="width: 50%;">
    <h2 style="color: green;">GeeksforGeeks</h2>
    <h3>Angular PrimeNG Accordion Tab Change Event</h3>
    <p-accordion [multiple]="true" (onClose)="onClose()">
        <p-accordionTab header="Complete Interview Preparation">
            <img src=
"https://media.geeksforgeeks.org/img-practice/banner/complete-interview-preparation-thumbnail.png?v=19265"
                height="300" width="350" alt="gfg"/>
        </p-accordionTab>
        <p-accordionTab header="System Design">
            <img src=
"https://media.geeksforgeeks.org/img-practice/banner/system-design-live-thumbnail.png?v=19265"
                height="300" width="350" alt="gfg" />
        </p-accordionTab>
        <p-accordionTab header="C++ STL Self-Paced">
            <img src=
"https://media.geeksforgeeks.org/img-practice/banner/cpp-stl-thumbnail.png?v=19265"
                height="300" width="350" alt="gfg"/>
        </p-accordionTab>
    </p-accordion>
</div>

app.component.ts:

JavaScript

import { Component } from '@angular/core';

@Component({
    selector: 'app-root',
    templateUrl: './app.component.html',
    styleUrls: ['./app.component.css'],
})

export class AppComponent { 
    onClose(){
        alert("Accordion is Closed")
    }
}

app.module.ts:

JavaScript

import { NgModule } from '@angular/core';
import { BrowserModule } 
    from '@angular/platform-browser';
import { BrowserAnimationsModule }
    from '@angular/platform-browser/animations';
import { AppComponent } from './app.component';
import { AccordionModule } from 'primeng/accordion';

@NgModule({
    imports: [
        BrowserModule,
        BrowserAnimationsModule,
        AccordionModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
})

export class AppModule { }

Output:

Example 2: Below is another example code that illustrates the use of Angular PrimenNG Accordion Tab Change. In this example, we will learn about the onOpen event.

app.component.html:

HTML

<div style="width: 50%;">
    <h2 style="color: green;">GeeksforGeeks</h2>
    <h3>Angular PrimeNG Accordion Tab Change Event</h3>
    <p-accordion [multiple]="true" (onOpen)="onOpen()">
        <p-accordionTab header="Complete Interview Preparation">
            <img src=
"https://media.geeksforgeeks.org/img-practice/banner/complete-interview-preparation-thumbnail.png?v=19265"
                height="300" width="350" alt="gfg" />
        </p-accordionTab>
        <p-accordionTab header="System Design">
            <img src=
"https://media.geeksforgeeks.org/img-practice/banner/system-design-live-thumbnail.png?v=19265"
                height="300" width="350" alt="gfg" />
        </p-accordionTab>
        <p-accordionTab header="C++ STL Self-Paced">
            <img src=
"https://media.geeksforgeeks.org/img-practice/banner/cpp-stl-thumbnail.png?v=19265"
                height="300" width="350" alt="gfg"
            />
        </p-accordionTab>
    </p-accordion>
</div>

app.component.ts:

JavaScript

import { Component } from '@angular/core';

@Component({
    selector: 'app-root',
    templateUrl: './app.component.html',
    styleUrls: ['./app.component.css'],
})

export class AppComponent { 
    onOpen(){
        alert("Accordion is Opened")
    }
}

app.module.ts:

JavaScript

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { BrowserAnimationsModule }
    from '@angular/platform-browser/animations';
import { AppComponent } from './app.component';
import { AccordionModule } from 'primeng/accordion';

@NgModule({
    imports: [
        BrowserModule,
        BrowserAnimationsModule,
        AccordionModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
})

export class AppModule { }

Output:

Reference: https://primefaces.org/primeng/accordion

Angular PrimeNG Accordion Tab Change Event

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