Angular 2 get element height

The ViewChild decorated variable elementView is only set after the ngAfterViewInit life cycle hook:

import {Component, ElementRef, ViewChild, AfterViewInit} from '@angular/core';

@Component({
  selector: 'my-app',
  templateUrl: './src/app.html'
})

export class AppComponent implements AfterViewInit {

  @ViewChild('content') elementView: ElementRef;

  contentHeight: number;

  constructor() {

  }

  ngAfterViewInit() {
      this.contentHeight = this.elementView.nativeElement.offsetHeight;
  }
}

See https://angular.io/api/core/ViewChild#how-to-use for more info.