Get incorrect offsetWidth and offsetHeight values

Answer 1

In order to get correct offset values you can use: ngAfterContentChecked with the AfterContentChecked Interface.

This method is called after every change detection run. So, inside this method use a flag (or counter) and setTimeOut:

if (this.counter <= 10) {
      // this print offsetwidth of my element
      console.log('mm ' + this.container.nativeElement.offsetWidth);


      // setTimeOut allow to run another changedetection 
      // so ngAfterContentChecked will run again
      setTimeout(() => { }, 0);

      //you could use a counter or a flag in order to stop getting the right width
      this.counter++;
    }

Hope it helps! Feel free to comment