Angular Material Expansion panel with sub expansion panels

Angular Material Expansion panel with sub expansion panels

To create a hierarchical structure of Angular Material Expansion Panels where you have sub-expansion panels within a main expansion panel, you can nest expansion panels within each other. Here's how you can achieve this:

Step-by-Step Implementation

  1. Install Angular Material (if not already installed):

    ng add @angular/material

  2. Import Angular Material Modules: Ensure that you have imported the necessary Angular Material modules in your app.module.ts or the module where you want to use the expansion panels.

    import { MatExpansionModule } from '@angular/material/expansion'; import { MatIconModule } from '@angular/material/icon'; import { BrowserAnimationsModule } from '@angular/platform-browser/animations'; @NgModule({ declarations: [ // Your components ], imports: [ BrowserModule, BrowserAnimationsModule, // Required for animations MatExpansionModule, MatIconModule ], providers: [], bootstrap: [AppComponent] }) export class AppModule { }

  3. Create Component for Expansion Panels: Create a new component or use an existing one where you want to implement the expansion panels.

    ng generate component expansion-panel

  4. Update Component Template (expansion-panel.component.html): Replace the template with nested mat-expansion-panel elements for the hierarchical structure.

    <mat-expansion-panel> <mat-expansion-panel-header> <mat-panel-title> Main Panel </mat-panel-title> </mat-expansion-panel-header> <mat-expansion-panel-content> <!-- Content of the main panel --> <mat-expansion-panel> <mat-expansion-panel-header> <mat-panel-title> Sub Panel 1 </mat-panel-title> </mat-expansion-panel-header> <mat-expansion-panel-content> <!-- Content of the sub panel 1 --> Sub panel 1 content </mat-expansion-panel-content> </mat-expansion-panel> <mat-expansion-panel> <mat-expansion-panel-header> <mat-panel-title> Sub Panel 2 </mat-panel-title> </mat-expansion-panel-header> <mat-expansion-panel-content> <!-- Content of the sub panel 2 --> Sub panel 2 content </mat-expansion-panel-content> </mat-expansion-panel> </mat-expansion-panel-content> </mat-expansion-panel>

  5. Add Styles (Optional): Customize the appearance of the expansion panels using CSS or Angular Material's theming features.

  6. Use Component in Your Application: Include the <app-expansion-panel></app-expansion-panel> selector in your main component's template (app.component.html) or any other component where you want to display the expansion panels.

Additional Tips:

  • Expansion Panel API: You can utilize Angular Material's API to dynamically control the expansion panels, handle events, and manage their state programmatically.
  • Nested Content: Populate the content of each expansion panel (both main and sub panels) with appropriate HTML, directives, or other Angular components as needed.

By following these steps, you can create a hierarchical structure of Angular Material Expansion Panels with sub-expansion panels nested within a main expansion panel in your Angular application. Adjust the content and styling according to your application's requirements and design guidelines.

Examples

  1. Angular Material Expansion Panel with nested subpanels

    • Description: Demonstrates how to implement an Angular Material Expansion Panel with nested subpanels.
    <!-- Parent Expansion Panel Component --> <mat-accordion> <mat-expansion-panel *ngFor="let parent of parentPanels"> <mat-expansion-panel-header> <mat-panel-title>{{ parent.title }}</mat-panel-title> </mat-expansion-panel-header> <mat-expansion-panel *ngFor="let child of parent.children"> <mat-expansion-panel-header> <mat-panel-title>{{ child.title }}</mat-panel-title> </mat-expansion-panel-header> <p>{{ child.content }}</p> </mat-expansion-panel> </mat-expansion-panel> </mat-accordion>

    This example shows how to use nested mat-expansion-panel components within an Angular Material mat-accordion to create a hierarchy of expandable panels.

  2. Angular Material Expansion Panel with toggle icons

    • Description: Illustrates how to add toggle icons for expanded/collapsed states in Angular Material Expansion Panels.
    <!-- Expansion Panel with Toggle Icons --> <mat-accordion> <mat-expansion-panel *ngFor="let panel of panels"> <mat-expansion-panel-header> <mat-panel-title> <mat-icon>{{ panel.expanded ? 'keyboard_arrow_up' : 'keyboard_arrow_down' }}</mat-icon> {{ panel.title }} </mat-panel-title> </mat-expansion-panel-header> <p>{{ panel.content }}</p> </mat-expansion-panel> </mat-accordion>

    Integrates toggle icons (mat-icon) based on the expanded/collapsed state of each mat-expansion-panel in Angular Material.

  3. Angular Material Expansion Panel with custom styling

    • Description: Shows how to apply custom styling to Angular Material Expansion Panels.
    /* Custom SCSS */ ::ng-deep { .mat-expansion-panel { background-color: #f0f0f0; box-shadow: none; border: 1px solid #ccc; margin-bottom: 10px; .mat-expansion-panel-header { background-color: #e0e0e0; color: #333; .mat-expansion-panel-header-title { font-size: 16px; font-weight: bold; } .mat-expansion-panel-header-description { font-size: 14px; } } } }

    Applies custom styling to mat-expansion-panel and mat-expansion-panel-header components using SCSS in Angular Material.

  4. Angular Material Expansion Panel with dynamic data

    • Description: Demonstrates how to populate Angular Material Expansion Panels dynamically with data.
    // Component TypeScript export class PanelComponent implements OnInit { panels: Panel[]; // Define Panel interface or class constructor(private panelService: PanelService) {} ngOnInit() { this.panelService.getPanels().subscribe(panels => { this.panels = panels; }); } } // Service to fetch panels export class PanelService { getPanels(): Observable<Panel[]> { // Replace with actual data retrieval logic return of([ { title: 'Panel 1', content: 'Content 1' }, { title: 'Panel 2', content: 'Content 2' } ]); } }

    Fetches and displays data dynamically within mat-expansion-panel components based on data retrieved from a service (PanelService) in Angular.

  5. Angular Material Expansion Panel with lazy loading content

    • Description: Shows how to lazy load content in Angular Material Expansion Panels to improve performance.
    <!-- Lazy Load Content in Expansion Panel --> <mat-accordion> <mat-expansion-panel *ngFor="let panel of panels"> <mat-expansion-panel-header> <mat-panel-title>{{ panel.title }}</mat-panel-title> </mat-expansion-panel-header> <mat-expansion-panel-content *ngIf="panel.expanded"> <ng-template matExpansionPanelContent> <!-- Lazy loaded content here --> <div *ngIf="!loaded">{{ fetchData(panel) }}</div> </ng-template> </mat-expansion-panel-content> </mat-expansion-panel> </mat-accordion>

    Implements lazy loading of content within mat-expansion-panel components in Angular Material using ng-template and conditional rendering (*ngIf).

  6. Angular Material Expansion Panel with form elements

    • Description: Integrates form elements, such as inputs and selects, within Angular Material Expansion Panels.
    <!-- Expansion Panel with Form Elements --> <mat-accordion> <mat-expansion-panel *ngFor="let panel of panels"> <mat-expansion-panel-header> <mat-panel-title>{{ panel.title }}</mat-panel-title> </mat-expansion-panel-header> <mat-form-field> <input matInput placeholder="Input"> </mat-form-field> <mat-form-field> <mat-select placeholder="Select"> <mat-option *ngFor="let option of options" [value]="option.value"> {{ option.viewValue }} </mat-option> </mat-select> </mat-form-field> </mat-expansion-panel> </mat-accordion>

    Includes form elements (mat-form-field, mat-input, mat-select) within mat-expansion-panel components in Angular Material.

  7. Angular Material Expansion Panel with reactive forms

    • Description: Demonstrates using Angular Material Expansion Panels with reactive forms for enhanced form handling.
    // Reactive Form with Expansion Panel export class PanelComponent { form: FormGroup; constructor(private fb: FormBuilder) { this.form = this.fb.group({ panelTitle: ['', Validators.required], panelContent: ['', Validators.required] }); } }

    Integrates reactive forms (FormGroup, FormBuilder) with mat-expansion-panel components for data binding and validation in Angular Material.

  8. Angular Material Expansion Panel with CRUD operations

    • Description: Shows how to perform CRUD (Create, Read, Update, Delete) operations using Angular Material Expansion Panels.
    // CRUD Operations with Expansion Panels export class PanelComponent { panels: Panel[]; constructor(private panelService: PanelService) { this.loadPanels(); } loadPanels() { this.panelService.getPanels().subscribe(panels => { this.panels = panels; }); } addPanel(panel: Panel) { this.panelService.addPanel(panel).subscribe(() => { this.loadPanels(); }); } updatePanel(panel: Panel) { this.panelService.updatePanel(panel).subscribe(() => { this.loadPanels(); }); } deletePanel(panelId: number) { this.panelService.deletePanel(panelId).subscribe(() => { this.loadPanels(); }); } }

    Implements CRUD operations (addPanel, updatePanel, deletePanel) with mat-expansion-panel components using Angular services (PanelService).

  9. Angular Material Expansion Panel with panel expansion state management

    • Description: Manages expansion states of Angular Material Expansion Panels dynamically.
    // Expansion Panel State Management export class PanelComponent { panels: Panel[]; constructor() { this.panels = [ { id: 1, title: 'Panel 1', content: 'Content 1', expanded: false }, { id: 2, title: 'Panel 2', content: 'Content 2', expanded: true } ]; } togglePanel(panel: Panel) { panel.expanded = !panel.expanded; } }

    Manages expansion states (expanded) of mat-expansion-panel components dynamically in Angular.

  10. Angular Material Expansion Panel with HTTP data fetching

    • Description: Fetches data from an HTTP endpoint to populate Angular Material Expansion Panels.
    // HTTP Data Fetching for Expansion Panels export class PanelComponent implements OnInit { panels: Panel[]; constructor(private http: HttpClient) {} ngOnInit() { this.http.get<Panel[]>('https://api.example.com/panels').subscribe(panels => { this.panels = panels; }); } }

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