JavaScript Answers

How to Detect When the Mouse Leaves the Window with JavaScript?

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To detect when the mouse leaves the window with JavaScript, we can add the mouseleave event to document .

For instance, we can write:

document.addEventListener("mouseleave", (event) => {  
  if (event.clientY <= 0 || event.clientX <= 0 || (event.clientX >= window.innerWidth || event.clientY >= window.innerHeight)) {  
    console.log("I'm out");  

We add a mouseleave event listener with the addEventListener method.

Then in the event listener, we check if one of the following conditions are met:

  • event.clientY is less than or equal to 0
  • event.clientX is less than or equal to 0
  • event.clientX is bigger than or equal to window.innerWidth
  • event.clientY is bigger than or equal to window.innerHeight

If any of the conditions are true , then we know the mouse is out of the browser tab.

And therefore, “I'm out" is logged.

By John Au-Yeung

Web developer specializing in React, Vue, and front end development.

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