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Angular MDBootstrap Collapse Component

Last Updated : 23 Jul, 2025
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MDBootstrap is a Material Design and bootstrap-based Angular UI library that is used to make attractive webpages with its seamless and easy-to-use component. In this article, we will know how to use Collapse Component in Angular MDBootstrap.

The Collapse Component indicates a collapsible element i.e. the content that will be shown or hidden with a click of a button.

Syntax:

<button mdbBtn (click)="gfg.toggle()" mdbWavesEffect>
   Click here
</button>
<div mdbCollapse #gfg="bs-collapse">
      <p>Content</p>
</div>

Approach:

  • Download Angular MDBootstrap from the official site.
  • Extract the files and change them to the working directory.
  • Install npm in the current project using the following command:
npm install
  • After creating your project folder i.e. appname, move to it using the following command:
cd appname
  • Start the server using the following command:
ng serve

Project Structure: After complete installation, it will look like the following:

Project Structure

Example 1: This is the basic example that illustrates how to use the Collapse Component in Angular MDBootstrap.

app.component.html 
<div id='gfg'>
    <h1>GeeksforGeeks</h1>
    <h4>Angular MDBootstrap Collapse Component</h4>
    <br />
    <div>
        <button mdbBtn color="primary" 
                class="waves-light" 
                type="button" 
                (click)="gfg.toggle()" mdbWavesEffect>
            Click Here To Toggle! 
        </button>
        <div mdbCollapse #gfg="bs-collapse">
            <p> 
                MDBootstrap is a bootstrap-based angular UI 
                library that is used to make good looking<br/> 
                webpages with its seamless and 
                easy-to-use component. 
            </p>
        </div>
    </div>
</div>
app.component.ts 
import { Component } from '@angular/core';

@Component({
  selector: 'my-app',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent{}
app.module.ts 
import { BrowserModule } from "@angular/platform-browser";
import { NgModule } from "@angular/core";
import { BrowserAnimationsModule } 
    from "@angular/platform-browser/animations";

import { AppComponent } from "./app.component";
import { MDBBootstrapModule } from "angular-bootstrap-md";
import { FormsModule } from "@angular/forms";

@NgModule({
  declarations: [AppComponent],
  imports: [
    BrowserModule,
    BrowserAnimationsModule,
    MDBBootstrapModule.forRoot(),
    FormsModule,
  ],
  providers: [],
  bootstrap: [AppComponent],
})
export class AppModule {}

Output:

Example 2: In this example, we have collapsed the text in the ngAfterViewInit lifecycle in Angular MDBootstrap.

app.component.html 
<div id="gfg">
    <h1>GeeksforGeeks</h1>
    <h4>
        Angular MDBootstrap Collapse Component
    </h4>
    <br />
    <button mdbBtn color="success"
            type="button" 
            (click)="test.toggle(); togglebg()" mdbWavesEffect>
        Click Here To Toggle 
    </button>
    <div mdbCollapse [isCollapsed]="true" 
         #test="bs-collapse">
        <p *ngIf="togglevisible">
            MDBootstrap is a bootstrap-based angular
            UI library that is used to make good looking<br /> 
            webpages with its seamless and easy-to-use component.
        </p>
    </div>
</div>
app.component.ts 
import { AfterViewInit, Component, ViewChildren } from "@angular/core";

@Component({
  selector: "my-app",
  templateUrl: "./app.component.html",
  styleUrls: ["./app.component.css"],
})
export class AppComponent implements AfterViewInit {
  @ViewChildren(AppComponent) collapses!: AppComponent[];

  ngAfterViewInit(): void {}
  togglevisible = false;

  togglebg() {
    this.togglevisible = !this.togglevisible;
  }
}
app.module.ts 
import { BrowserModule } from "@angular/platform-browser";
import { NgModule } from "@angular/core";
import { BrowserAnimationsModule } 
    from "@angular/platform-browser/animations";

import { AppComponent } from "./app.component";
import { CollapseModule, MDBBootstrapModule }
    from "angular-bootstrap-md";
import { FormsModule } from "@angular/forms";

@NgModule({
  declarations: [AppComponent],
  imports: [
    BrowserModule,
    BrowserAnimationsModule,
    MDBBootstrapModule.forRoot(),
    FormsModule,
    CollapseModule,
  ],
  providers: [],
  bootstrap: [AppComponent],
})
export class AppModule {}
app.component.css 
#gfg{
    margin: 40px
}
.a{
    border-radius: 5px;
    border: 2px solid black;
    padding: 10px;
}

Output:

Reference: https://mdbootstrap.com/docs/angular/components/collapse/


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