How to detect idle time in JavaScript elegantly?

Question

Is it possible to detect \"idle\" time in JavaScript?
My primary use case probably would be to pre-fetch or preload content.

Idle time:

Answer 1

You can do it more elegantly with underscore and jquery-

$('body').on("click mousemove keyup", _.debounce(function(){
    // do preload here
}, 1200000)) // 20 minutes debounce