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Angular Material Resources

Angular Material - Expansion Panel

Quiz

The <mat-expansion-panel>, an Angular Directive, is used to create an expandable detail v/s summary view.

<mat-expansion-panel-header> − Represents the header section. Contains summary of panel and acts as control to expand or collapse the panel.
<mat-panel-title> − Represents the panel title.
<mat-panel-description> − Represents the panel summary.
<mat-action-row> − Represents the actions panel at the bottom.

In this chapter, we will showcase the configuration required to draw a expansion control using Angular Material.

Create Angular Application

Follow the following steps to update the Angular application we created in Angular Material - First Application chapter −

Step	Description
1	Create a project with a name material-app as explained in the Angular Material - First Application chapter.
2	Modify app.ts and app.html as explained below. Keep rest of the files unchanged.
3	Compile and run the application to verify the result of the implemented logic.

app.ts

Following is the content of the modified app.ts.

import { Component, signal } from '@angular/core';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { MatButtonModule } from '@angular/material/button';
import { MatCheckboxModule } from '@angular/material/checkbox';
import { MatExpansionModule } from '@angular/material/expansion';
import { MatFormFieldModule } from '@angular/material/form-field';
import { MatInputModule } from '@angular/material/input';

@Component({
   selector: 'app-root',
   imports: [
      FormsModule,
      MatFormFieldModule,
      MatExpansionModule, 
      MatInputModule,
      MatButtonModule, 
      MatCheckboxModule,
      ReactiveFormsModule,
   ],
   templateUrl: './app.html',
   styleUrl: './app.css'
})
export class App {
   protected readonly title = signal('material-app');
}

app.html

Following is the content of the modified HTML host file app.html.

<mat-expansion-panel>
   <mat-expansion-panel-header>
      <mat-panel-title>
         Personal data
      </mat-panel-title>
      <mat-panel-description>
         Type name and age
      </mat-panel-description>
   </mat-expansion-panel-header>
   <mat-form-field>
      <input matInput placeholder="Name">
   </mat-form-field>
   <mat-form-field>
      <input matInput placeholder="Age">
   </mat-form-field>
</mat-expansion-panel>

Result

Verify the result.

Details

As first, we've created expansion panel using mat-expansion-panel.
Then, we've added title, subtitle and content to it.

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