setTimeout does not work inside forEach loop in Typescript / Angular

Question

I have forEach loop that hides an HTML element after 10 sec. I've put it inside a setTimeout function but it's not waiting for 10 sec, the element is hiding with page load. Not sure if it is because of Angulars lifecycle looks or forEach loop.

Here is my typescript code

ngAfterViewChecked() {  
    if(this.on) {  
      this._notificationsElements.forEach((element) => {      
        const htmlElement = element.nativeElement as HTMLElement;
        setTimeout(htmlElement.setAttribute("style", "display:none;"), 10000);
      });
    }
  }

Possible duplicate of Why is the method executed immediately when I use setTimeout? — Peter B
– Peter B, Commented Jun 7, 2018 at 12:16

Joe · Accepted Answer · 2018-06-07 12:15:48Z

4

setTimeout(htmlElement.setAttribute("style", "display:none;"),10000);

needs to be:

setTimeout(() => htmlElement.setAttribute("style", "display:none;"),10000);

setTimeout requires a function.

answered Jun 7, 2018 at 12:15

Joe

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1 Comment

Ingo Bürk Over a year ago

That being said, hiding it like this is a pretty dirty way of doing it.

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