How to detect if the user has switched browser tab?

Question

If the user switches tab or open other applications, I want to throw an error message

How to do this in JavaScript? (I'm using Angular) Thanks in advance

Does this answer your question? [Detect If Browser Tab Has Focus](https://stackoverflow.com/questions/7389328/detect-if-browser-tab-has-focus) — Maxim Mazurok, Apr 24 '20 at 07:05

score 1 · Answer 1 · answered Apr 24 '20 at 07:05

1

Not specific to Angular but JS.

answered Apr 24 '20 at 07:05

Terry

I agree, but please, use "flag" option instead of answering – Maxim Mazurok Apr 24 '20 at 07:06
Actually, there is a 'angular way' of doing this, using [HostListener](https://angular.io/api/core/HostListener) – Mike S. Apr 24 '20 at 07:09
@MikeS. That's more 'angular way' of listening for `window` events, I think. Tab focus detection is not framework-specific unless there's a plugin to do that... – Maxim Mazurok Apr 24 '20 at 07:12

1 Answers1