How to get width of (DOM) Element in Angular 4 after page is loaded

Question

I'm looking for a solution in Angular 4 to get the width of DOM element without taking any action (click or window resize), just after the page is loaded, but before I start to draw the svg. I've found a similar case in here but it doesn't work for me. I get the same error:

ERROR TypeError: Cannot read property 'nativeElement' of undefined

I need to get the width of div container to set veiwbox of svg I'm drawing inside it.

Here is the template:

<div id="what-is-the-width" class="svg-chart-container">
    <svg [innerHTML]="svg"></svg>
</div>

and TS file with stuff needed in this case:

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

export class SvgChartComponent implements OnInit {

  @ViewChild('what-is-the-width') elementView: ElementRef;

  constructor() { }

  ngAfterViewInit() {
    console.log(this.elementView.nativeElement);
  }

  ngOnInit() {
    //this method gets the data from the server and draw the svg
    this.getSVGChartData();
  }
}

Does anyone have ideas how to get this working?