Angular2 get window width onResize

Question

Trying to figure out how to get window width on resizing events in Angular2. Here is my code:

export class SideNav {

    innerWidth: number;

    constructor(pr         


        

Answer 1

In this case you need to run change detection manually. As you are modifying component variable from outer context of Angular, basically resize event doesn't get monkey patched by Angular2 change detection system.

Code

import {ChangeDetectorRef} from 'angular2/core'

export class SideNav {
    innerWidth: number;

    constructor(private window: Window, private cdr: ChangeDetectorRef){

       let getWindow = () => {
          return window.innerWidth;
       };

      window.onresize = () => {
          this.innerWidth = getWindow();
          this.cdr.detectChanges(); //running change detection manually
      };
    }
}

Rather I'd like to suggest you to go for this answer, which looks more cleaner

Answer 2

<div (window:resize)="onResize($event)"

onResize(event) {
  event.target.innerWidth; 
}

to get notified on scroll events on a child element in a components template

or listen on the components host element itself

@HostListener('window:resize', ['$event'])
onResize(event) {
  event.target.innerWidth; 
}

Answer 3

Use NgZone to trigger change detection:

constructor(ngZone:NgZone) {
    window.onresize = (e) =>
    {
        ngZone.run(() => {
            this.width = window.innerWidth;
            this.height = window.innerHeight;
        });
    };
}