html - How to toggle mat-expansion-panel with button click?

Html - How to toggle mat-expansion-panel with button click?

To toggle a mat-expansion-panel with a button click in an Angular application using Angular Material, you can use the matExpansionPanel directive along with a button and manage the state in your component. Here's an example:

Assuming you have a component with a template like this:

<!-- your.component.html --> <mat-expansion-panel #myPanel> <mat-expansion-panel-header> <mat-panel-title> Panel Title </mat-panel-title> <mat-panel-description> Panel Description </mat-panel-description> </mat-expansion-panel-header> <!-- Panel content goes here --> </mat-expansion-panel> <button (click)="togglePanel()">Toggle Panel</button>

And in your component class:

// your.component.ts import { Component, ViewChild } from '@angular/core'; import { MatExpansionPanel } from '@angular/material/expansion'; @Component({ selector: 'app-your', templateUrl: './your.component.html', styleUrls: ['./your.component.css'] }) export class YourComponent { @ViewChild('myPanel') myPanel: MatExpansionPanel; togglePanel() { this.myPanel.toggle(); } }

In this example:

  • We use ViewChild to get a reference to the mat-expansion-panel element with the template reference variable #myPanel.
  • The togglePanel method is called when the button is clicked, and it calls the toggle() method on the mat-expansion-panel to toggle its state (open/close).

Make sure you have imported MatExpansionModule in your module where the component is declared:

import { MatExpansionModule } from '@angular/material/expansion'; @NgModule({ declarations: [ // your components ], imports: [ MatExpansionModule, // other modules ], }) export class YourModule { }

This way, clicking the "Toggle Panel" button will toggle the state of the mat-expansion-panel. Adjust the template and styles according to your application's needs.

Examples

  1. Toggle mat-expansion-panel with Button Click - Template Reference Variable

    <mat-expansion-panel #myPanel> <!-- Panel content goes here --> </mat-expansion-panel> <button (click)="myPanel.toggle()">Toggle Panel</button>

    Description: Uses a template reference variable (#myPanel) to toggle the mat-expansion-panel's state with a button click.

  2. Toggle mat-expansion-panel with ngModel

    <mat-expansion-panel [(expanded)]="isPanelExpanded"> <!-- Panel content goes here --> </mat-expansion-panel> <button (click)="togglePanel()">Toggle Panel</button> 
    isPanelExpanded = false; togglePanel() { this.isPanelExpanded = !this.isPanelExpanded; }

    Description: Toggles the mat-expansion-panel's state using [(expanded)] and a button click with ngModel.

  3. Toggle mat-expansion-panel with Event Binding

    <mat-expansion-panel [expanded]="isPanelExpanded"> <!-- Panel content goes here --> </mat-expansion-panel> <button (click)="togglePanel()">Toggle Panel</button> 
    isPanelExpanded = false; togglePanel() { this.isPanelExpanded = !this.isPanelExpanded; }

    Description: Uses event binding to toggle the mat-expansion-panel's state with a button click.

  4. Toggle mat-expansion-panel with ViewChild

    <mat-expansion-panel #myPanel> <!-- Panel content goes here --> </mat-expansion-panel> <button (click)="togglePanel()">Toggle Panel</button> 
    @ViewChild('myPanel') myPanel: MatExpansionPanel; togglePanel() { this.myPanel.toggle(); }

    Description: Utilizes @ViewChild to reference the mat-expansion-panel and toggle its state with a button click.

  5. Toggle mat-expansion-panel with ngIf

    <mat-expansion-panel *ngIf="isPanelVisible"> <!-- Panel content goes here --> </mat-expansion-panel> <button (click)="togglePanel()">Toggle Panel</button> 
    isPanelVisible = true; togglePanel() { this.isPanelVisible = !this.isPanelVisible; }

    Description: Toggles the visibility of the mat-expansion-panel using ngIf with a button click.

  6. Toggle mat-expansion-panel with ngClass

    <mat-expansion-panel [ngClass]="{ 'expanded-panel': isPanelExpanded }"> <!-- Panel content goes here --> </mat-expansion-panel> <button (click)="togglePanel()">Toggle Panel</button> 
    isPanelExpanded = false; togglePanel() { this.isPanelExpanded = !this.isPanelExpanded; }

    Description: Uses ngClass to conditionally apply a class based on the mat-expansion-panel's expanded state.

  7. Toggle mat-expansion-panel with ngStyle

    <mat-expansion-panel [ngStyle]="{ 'height': isPanelExpanded ? 'auto' : '48px' }"> <!-- Panel content goes here --> </mat-expansion-panel> <button (click)="togglePanel()">Toggle Panel</button> 
    isPanelExpanded = false; togglePanel() { this.isPanelExpanded = !this.isPanelExpanded; }

    Description: Uses ngStyle to dynamically adjust the mat-expansion-panel's height based on its expanded state.

  8. Toggle mat-expansion-panel Programmatically

    <mat-expansion-panel> <!-- Panel content goes here --> </mat-expansion-panel> <button (click)="togglePanel()">Toggle Panel</button> 
    import { MatExpansionPanel } from '@angular/material/expansion'; constructor(private panel: MatExpansionPanel) {} togglePanel() { this.panel.toggle(); }

    Description: Toggles the mat-expansion-panel programmatically using the MatExpansionPanel service.

  9. Toggle mat-expansion-panel with ngIf and Template Reference Variable

    <mat-expansion-panel *ngIf="isPanelVisible" #myPanel> <!-- Panel content goes here --> </mat-expansion-panel> <button (click)="togglePanel()">Toggle Panel</button> 
    isPanelVisible = true; togglePanel() { this.isPanelVisible = !this.isPanelVisible; }

    Description: Combines ngIf and a template reference variable to toggle the mat-expansion-panel's visibility.

  10. Toggle Multiple mat-expansion-panels with ngFor

    <mat-expansion-panel *ngFor="let item of items" [expanded]="item.isExpanded"> <!-- Panel content goes here --> {{ item.name }} </mat-expansion-panel> <button (click)="toggleAllPanels()">Toggle All Panels</button> 
    items = [ { name: 'Item 1', isExpanded: false }, { name: 'Item 2', isExpanded: false }, // Add more items as needed ]; toggleAllPanels() { this.items.forEach(item => (item.isExpanded = !item.isExpanded)); }

    Description: Toggles the expanded state of multiple mat-expansion-panels using ngFor and ngModel.

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