Bootstrap Collapse in Angular 9/8 Example

March 19, 2020 | Category : Angular 9 Angular 8 Angular

In this quick example, let's see bootstrap collapse in angular 9/8. i explained simply about bootstrap 4 collapse in angular 9/8. if you have question about bootstrap Collapse angular 9/8 example then i will give simple example with solution. i would like to show you angular 9/8 bootstrap 4 collapse example.

Ng Bootstrap is developed from bootstrap and they provide all bootstrap 3 and bootstrap 4 native Angular directives like model, collapse, tooltip, tabs, pagination, datepicker, buttons etc. Ng Bootstrap will help to easily use bootstrap ui.

In this example we will simply create collapse, so you can use in your angular 8 application. we will use collapse step by step, so you can easily understand.

So, let's follow this tutorial step by step.

Step 1: Create New App

You can easily create your angular app using bellow command:

ng new my-new-app

Step 2: Install Bootstrap 4

In this step, we will install bootstrap core package. so we can use bootstrap css so let's install by following command:

npm install bootstrap --save

Now, we need to include bootstrap css like "node_modules/bootstrap/dist/css/bootstrap.min.css", so let's add it on angular.json file.



"styles": [





Step 3: Install Ng Bootstrap

In this step, we will install Ng Bootstrap package. so we can use bootstrap ui so let's install by following command:

npm install --save @ng-bootstrap/ng-bootstrap

Step 4: Import Module

In this step, we need to import NgbModule to app.module.ts file. so let's import it as like bellow:


import { BrowserModule } from '@angular/platform-browser';

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

import { AppComponent } from './app.component';

import {NgbModule} from '@ng-bootstrap/ng-bootstrap';


declarations: [



imports: [




providers: [],

bootstrap: [AppComponent]


export class AppModule { }

Step 5: Updated View File

Now here, we will updated our html file. we will create simple bootstrap collapse example as like bellow.

so let's put bellow code:


<div class="container">

<h1>Angular 8 Bootstrap Collapse Example -</h1>


<button type="button" class="btn btn-outline-primary" (click)="isCollapsed = !isCollapsed"

[attr.aria-expanded]="!isCollapsed" aria-controls="collapseExample">

Collapse Toggle



<div id="collapseExample" [ngbCollapse]="isCollapsed">

<div class="card">

<div class="card-body">

You can collapse this card by clicking Toggle Button. This is example from





Step 6: Updated ts File

Now, let's update file as like bellow:


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


selector: 'app-root',

templateUrl: './app.component.html',

styleUrls: ['./app.component.css']


export class AppComponent {

title = 'appBootstrap';

public isCollapsed = false;

constructor() {}


Now we are ready to run both:

Run Angular App:

ng serve

I hope it can help you...