Stop mouse event propagation

If you want to be able to add this to any elements without having to copy/paste the same code over and over again, you can make a directive to do this. It is as simple as below:

import {Directive, HostListener} from "@angular/core";    @Directive({    selector: "[click-stop-propagation]"})export class ClickStopPropagation{    @HostListener("click", ["$event"])    public onClick(event: any): void    {        event.stopPropagation();    }}

Then just add it to the element you want it on:

<div click-stop-propagation>Stop Propagation</div>

The simplest is to call stop propagation on an event handler. $event works the same in Angular 2, and contains the ongoing event (by it a mouse click, mouse event, etc.):

(click)="onEvent($event)"

on the event handler, we can there stop the propagation:

onEvent(event) {   event.stopPropagation();}

Calling stopPropagation on the event prevents propagation: 

(event)="doSomething($event); $event.stopPropagation()"

For preventDefault just return false

(event)="doSomething($event); false"

Event binding allows to execute multiple statements and expressions to be executed sequentially (separated by ; like in *.ts files.
The result of last expression will cause preventDefault to be called if falsy. So be cautious what the expression returns (even when there is only one)