Change arrow style for default expansion panel arrow

user_5083828 0
Viewed 23446

I have an angular expansion panel as shown below.

enter image description here

But I want to change the the design of the arrow to something like this:

Not expanded:

enter image description here

Expanded:

enter image description here

How? or is it possible for me to do so in angular material? Code below:

HTML:

<md-expansion-panel>
  <md-expansion-panel-header>
    <md-panel-title>
      Personal data
    </md-panel-title>
    <md-panel-description>
      Type your name and age
    </md-panel-description>
  </md-expansion-panel-header>

  <md-form-field>
    <input mdInput placeholder="First name">
  </md-form-field>

  <md-form-field>
    <input mdInput placeholder="Age">
  </md-form-field>
</md-expansion-panel>

TS:

import {Component} from '@angular/core';

/**
 * @title Basic expansion panel
 */
@Component({
  selector: 'expansion-overview-example',
  templateUrl: 'expansion-overview-example.html',
})
export class ExpansionOverviewExample {}
angular-material2 angular-material angular css
3 Answers

Yes it is possible. Give your expansion panel a reference id e.g. example and set the hideToggle property as true.

In the <md-panel-description>, you can place your icons and use the expanded property of the panel to show or hide the relevant icons. 

  <md-expansion-panel  class="custom-header" hideToggle="true" #example>
    <md-expansion-panel-header>
      <md-panel-title>
        Personal data
      </md-panel-title>
      <md-panel-description>
        Type your name and age
        <md-icon *ngIf="!example.expanded">play_arrow</md-icon>
        <md-icon *ngIf="example.expanded">arrow_drop_down</md-icon>
      </md-panel-description>
    </md-expansion-panel-header>

    <md-form-field>
      <input mdInput placeholder="First name">
    </md-form-field>

    <md-form-field>
      <input mdInput placeholder="Age">
    </md-form-field>
  </md-expansion-panel>

To provide space between the icon and panel description, add the following classes in your component.css: 

.custom-header .mat-expansion-panel-header-title, 
.custom-header .mat-expansion-panel-header-description {
  flex-basis: 0;
}

.custom-header .mat-expansion-panel-header-description {
  justify-content: space-between;
  align-items: center;
}

I have used material icons. You can place your custom icons if you want. Here is a link to stackblitz demo.

user_17919130

extended the answer from @Faisal and as per the latest version of angular material, we will use mat prefix instead of md for the Material components.

Angular Material 8.1.4

<mat-expansion-panel class="mb-15px" hideToggle="true" #xyz>
<mat-expansion-panel-header>
  <mat-panel-title class="font-weight-bold font-small">
    Info
  </mat-panel-title>
  <mat-panel-description>
    <mat-icon *ngIf="!xyz.expanded">play_arrow</mat-icon>
    <mat-icon *ngIf="xyz.expanded">arrow_drop_down</mat-icon>
  </mat-panel-description>
</mat-expansion-panel-header>
<mat-expansion-panel class="mb-15px" hideToggle="true" #xyz>

Stackblitz Demo

user_51982500

Another pretty solution .. just add a span with fxFlex

  <mat-panel-description>
       <span fxFlex></span>
       <img src="">
   </mat-panel-description>

Don't forget to add hideToggle to the mat-expansion-panel

<mat-expansion-panel hideToggle>
user_76918910
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