What is the Angular4 "Change" event trigger directive in Textarea

(change) didn't work for me neither, try (input) it worked perfectly :

<textarea [(ngModel)]="mytext" (input)="autoGrow($event)"></textarea>

You should be using ngModelChange

   <textarea cols="25" [ngModel]="data" (ngModelChange)="doSomething($event)"></textarea>

LIVE DEMO

Update:

(change) event will work in textarea but it is triggered on blur and text changed inside the text area

DEMO

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