Change or click event of mat-button-toggle

Question

I have a mat-button-toggle-group which has 5 mat-button-toggle. I need to fire an event on the click or on the change of the val, although I prefer it be a click event.

The documentation provided here shows there is no click event, but there is a change event.

I have tried the change event too (as shown below) , but the event is not getting triggered.

 <mat-button-toggle-group #group="matButtonToggleGroup" [(ngModel)]="rowAction">
  <mat-button-toggle value="raw_swift_msg" (change)="onValChange(value)" matTooltip="View Message">
    <i class="fa fa-eye" style="color:#455A64" aria-hidden="true"></i>
  </mat-button-toggle>
  <mat-button-toggle value="message_comment" matTooltip="Message Comment">
    <i class="fa fa-comments" style="color:#455A64" aria-hidden="true"></i>
  </mat-button-toggle>
  <mat-button-toggle value="link_trade" hasAccess id="LinkMessagePopup" matTooltip="Link Message">
    <i class="fa fa-link" style="color:#455A64" aria-hidden="true"></i>
  </mat-button-toggle>
  <mat-button-toggle value="audit_trail" matTooltip="View Audit">
    <i class="fa fa-history" style="color:#455A64" aria-hidden="true"></i>
  </mat-button-toggle>
   <mat-button-toggle hasAccess id="MessagePopup" value="move_message" matTooltip="Move message">
    <i class="fa fa-exchange" style="color:#455A64" aria-hidden="true"></i>
  </mat-button-toggle> 
  <mat-button-toggle value="log" matTooltip="View log">
    <i class="fa fa-book" style="color:#455A64" aria-hidden="true"></i>
  </mat-button-toggle>
</mat-button-toggle-group>

In My .ts file

import {MatButtonToggleModule} from '@angular/material/button-toggle';

onValChange(val: string) {
 this.selectedVal = val;
}   

How to trigger the above change function?

Answer 1

it should be :

html:

 <mat-button-toggle-group #group="matButtonToggleGroup">
  <mat-button-toggle value="raw_swift_msg" (change)="onValChange($event.value)" matTooltip="View Message">
    <i class="fa fa-eye" style="color:#455A64" aria-hidden="true"></i>
  </mat-button-toggle>
  <mat-button-toggle (change)="onValChange($event.value)" value="message_comment" matTooltip="Message Comment" >
    <i class="fa fa-comments" style="color:#455A64" aria-hidden="true"></i>
  </mat-button-toggle>
</mat-button-toggle-group>

component:

onValChange(value){
     console.log(value)
}

check this working stackblitz

Answer 2

An easier solution to get a change event on the entire mat-button-toggle-group is to set a change event on the group, instead of each toggle button.

<mat-button-toggle-group (change)="onValChange($event.value)">
    <mat-button-toggle value="bold">Bold</mat-button-toggle>
    <mat-button-toggle value="italic">Italic</mat-button-toggle>
    <mat-button-toggle value="underline">Underline</mat-button-toggle>
</mat-button-toggle-group>

Now you can listen to the event in your component:

onValChange(value) {
    console.log(value);
}

Worked for me.