How to detect browser minimize and maximize state in javascript [duplicate]

Answer 1

Here's Piotrek De's answer on another question:

There is a neat library available on GitHub:

https://github.com/serkanyersen/ifvisible.js

Example:

// If page is visible right now
if( ifvisible.now() ){
  // Display pop-up
  openPopUp();
}

I've tested version 1.0.1 on all browsers I have and can confirm that it works with:

• IE9, IE10
• FF 26.0
• Chrome 34.0

and probably all newer versions.

Doesn't fully work with:

• IE8 - always indicate that tab/window is currently active (.now() always returns true for me)