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How to use angular material expansion panel and accordion

Adrian Matei
Making bookmarking easier for devs with www.codever.land
Originally published at codepedia.org ・2 min read

I find accordions pretty well suited for FAQs or HowTo pages. That's why I chose one for the HowTo page of www.bookmarks.dev, which is implemented with angular material expansion panel and accordion:

HowTo Accordeon Showcase

This blog post presents the source code for that with a couple of notes.

The complete source code is available on Github

The source code

  <mat-accordion>
    <mat-expansion-panel>
      <mat-expansion-panel-header>
        <h4><i class="fas fa-xs fa-info-circle"></i> Get started</h4>
      </mat-expansion-panel-header>

      <ng-template matExpansionPanelContent>
        <app-howto-get-started></app-howto-get-started>
      </ng-template>
    </mat-expansion-panel>

    <mat-expansion-panel>
      <mat-expansion-panel-header>
        <h4><i class="fas fa-xs fa-info-circle"></i> Save bookmarks</h4>
      </mat-expansion-panel-header>
      <ng-template matExpansionPanelContent>
        <app-howto-save></app-howto-save>
      </ng-template>
    </mat-expansion-panel>

    <mat-expansion-panel>
      <mat-expansion-panel-header>
        <h4><i class="fas fa-xs fa-info-circle"></i> Search bookmarks</h4>
      </mat-expansion-panel-header>
      <ng-template matExpansionPanelContent>
        <app-howto-search></app-howto-search>
      </ng-template>
    </mat-expansion-panel>

    <mat-expansion-panel>
      <mat-expansion-panel-header>
        <h4><i class="fas fa-xs fa-info-circle"></i> Bookmarklets</h4>
      </mat-expansion-panel-header>
      <ng-template matExpansionPanelContent>
        <app-howto-bookmarklets></app-howto-bookmarklets>
      </ng-template>
    </mat-expansion-panel>

    <mat-expansion-panel>
      <mat-expansion-panel-header>
        <h4><i class="fas fa-xs fa-info-circle"></i> Codelets</h4>
      </mat-expansion-panel-header>
      <ng-template matExpansionPanelContent>
        <app-howto-codelets></app-howto-codelets>
      </ng-template>
    </mat-expansion-panel>
  </mat-accordion>
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Notes

  • the mat-expansion-panel components are encapsulated in an mat-accordion element
  • the code itself for the several sections is encapsulated in own component, for better code readability and to access them directly
  • the construct ng-template with the matExpansionPanelContent attribute in the is used to defer initialization until the panel is open. By default, the expansion panel content will be initialized even when the panel is closed
  • by setting the input multi="true" (default false) on mat-accordion you could allow the expansions state to be set independently of each other

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