How to use angular material expansion panel and accordion

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:

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>

  <span class="nt">&lt;ng-template</span> <span class="na">matExpansionPanelContent</span><span class="nt">&gt;</span>
    <span class="nt">&lt;app-howto-get-started&gt;&lt;/app-howto-get-started&gt;</span>
  <span class="nt">&lt;/ng-template&gt;</span>
<span class="nt">&lt;/mat-expansion-panel&gt;</span>

<span class="nt">&lt;mat-expansion-panel&gt;</span>
  <span class="nt">&lt;mat-expansion-panel-header&gt;</span>
    <span class="nt">&lt;h4&gt;&lt;i</span> <span class="na">class=</span><span class="s">"fas fa-xs fa-info-circle"</span><span class="nt">&gt;&lt;/i&gt;</span> Save bookmarks<span class="nt">&lt;/h4&gt;</span>
  <span class="nt">&lt;/mat-expansion-panel-header&gt;</span>
  <span class="nt">&lt;ng-template</span> <span class="na">matExpansionPanelContent</span><span class="nt">&gt;</span>
    <span class="nt">&lt;app-howto-save&gt;&lt;/app-howto-save&gt;</span>
  <span class="nt">&lt;/ng-template&gt;</span>
<span class="nt">&lt;/mat-expansion-panel&gt;</span>

<span class="nt">&lt;mat-expansion-panel&gt;</span>
  <span class="nt">&lt;mat-expansion-panel-header&gt;</span>
    <span class="nt">&lt;h4&gt;&lt;i</span> <span class="na">class=</span><span class="s">"fas fa-xs fa-info-circle"</span><span class="nt">&gt;&lt;/i&gt;</span> Search bookmarks<span class="nt">&lt;/h4&gt;</span>
  <span class="nt">&lt;/mat-expansion-panel-header&gt;</span>
  <span class="nt">&lt;ng-template</span> <span class="na">matExpansionPanelContent</span><span class="nt">&gt;</span>
    <span class="nt">&lt;app-howto-search&gt;&lt;/app-howto-search&gt;</span>
  <span class="nt">&lt;/ng-template&gt;</span>
<span class="nt">&lt;/mat-expansion-panel&gt;</span>

<span class="nt">&lt;mat-expansion-panel&gt;</span>
  <span class="nt">&lt;mat-expansion-panel-header&gt;</span>
    <span class="nt">&lt;h4&gt;&lt;i</span> <span class="na">class=</span><span class="s">"fas fa-xs fa-info-circle"</span><span class="nt">&gt;&lt;/i&gt;</span> Bookmarklets<span class="nt">&lt;/h4&gt;</span>
  <span class="nt">&lt;/mat-expansion-panel-header&gt;</span>
  <span class="nt">&lt;ng-template</span> <span class="na">matExpansionPanelContent</span><span class="nt">&gt;</span>
    <span class="nt">&lt;app-howto-bookmarklets&gt;&lt;/app-howto-bookmarklets&gt;</span>
  <span class="nt">&lt;/ng-template&gt;</span>
<span class="nt">&lt;/mat-expansion-panel&gt;</span>

<span class="nt">&lt;mat-expansion-panel&gt;</span>
  <span class="nt">&lt;mat-expansion-panel-header&gt;</span>
    <span class="nt">&lt;h4&gt;&lt;i</span> <span class="na">class=</span><span class="s">"fas fa-xs fa-info-circle"</span><span class="nt">&gt;&lt;/i&gt;</span> Codelets<span class="nt">&lt;/h4&gt;</span>
  <span class="nt">&lt;/mat-expansion-panel-header&gt;</span>
  <span class="nt">&lt;ng-template</span> <span class="na">matExpansionPanelContent</span><span class="nt">&gt;</span>
    <span class="nt">&lt;app-howto-codelets&gt;&lt;/app-howto-codelets&gt;</span>
  <span class="nt">&lt;/ng-template&gt;</span>
<span class="nt">&lt;/mat-expansion-panel&gt;</span>



    

    




</mat-accordion>

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

Blog

How to use angular material expansion panel and accordion

Adrian Matei

The source code

Notes

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