Angular 2 prevent click on parent when clicked on child

51
votes

I have a click event nested one level. When i click on the child the expected function is called but the parent's function is also called. Here is the code

<li class="task-item" *ngFor="let task of tasks" (click)="showTask(task.name)">
    <input type="checkbox" [ngModel]="task.taskStatus" (ngModelChange)="changeTaskStatus($event)" />
</li>

So when the checkbox changes changeTaskStatus() and the showTask() called together. I want the parent to keep quiet when checkbox changes. How do I achieve this? It was easy to handle this in Angular 1

Things I've tried that failed

Used $event.stopPropagation() in the checkbox's click event that changed nothing 

<input type="checkbox" [ngModel]="task.taskStatus" (click)="$event.stopPropagation()" (ngModelChange)="changeTaskStatus($event)" />
3
angularangular2-template
plnkr.co/edit/CsfL5oHPcxQJ2Zt7HOn2?p=preview This is working . - Milad
The code in plnkr works but the same doesn't work for me! The <li> repeats and all checkboxes have same ngModel is that the problem? - Ashik Basheer
I figured it out. I had a custom CSS on the checkbox that was causing the problem. - Ashik Basheer
Please add your solutions in an answer box, rather than as edits to the question. Thank you. - halfer
Thanks. works like a charm - Sacky San

3 Answers

88
votes

You need to use stopPropagation() for checkbox event:

<input type="checkbox" [ngModel]="task.taskStatus" (ngModelChange)="changeTaskStatus($event);$event.stopPropagation()" />

It prevents further propagation of the current event in the capturing and bubbling phases. You can read more here. Also, you probably need to add stopPropagation() to click event of checkbox, but I'm not 100% sure:

<input type="checkbox" [ngModel]="task.taskStatus" (click)="$event.stopPropagation()" (ngModelChange)="changeTaskStatus($event)" />
31
votes

Just you need to add $event.stopPropagation() code on Child div on click event 

 <input  (click)="onChildClickFunction();$event.stopPropagation()"/>
3
votes

This is known as Event Bubbling. Events are first handled by the innermost element and then propagate to the outer elements until they reach the root.

<div *ngFor="let item of userList">
  <div (click)="setUserData(item)">
    <a (click)="getUserDetails(item.user.id)">Name - {{item.user.name}}</a>
  </div>
</div>

In this case, when you click on username or tag, it will first call inner element i.e. getUserDetails() and the root element i.e. setUserData().

So, to prevent this event bubbling, just add

event.preventDefault();

in defination of getUserDetails($event) or

<a (click)="getUserDetails(item.user.id); $event.stopPropagation();">Name - {{item.user.name}}</a>

That's all you need to you.