javascript：窗外事件

Question

Is it possible to get a mouse event which is fired outside of a browser window? Or is it possible to check if the mouse is pressed when the mouse is moved over a window?

Answer 1

This is not possible, but from this sentence here -

Or is it possible to check if the mouse is pressed when the mouse is moved over a window

You can check when the page is being focused, so when someone switches back to your page tab.

window.onfocus = function() {
   console.log('focus');
   alert('focus'); // See note
};

Note - If you use alert in the onfocus event the alert will popup multiple times. This only happens with alert and must be a bug somewhere, maybe someone can shed some light on it.

Demo

Answer 2

It is possible to see if the mouse is in the window or not. You could do this with a setInterval that checks every 300 ms or so to see if the mouse is in the window.

You could also use mouseout and mouseover events, assuming you can include jQuery.

$(document).mouseout(function(){
alert("Mouse not in window");
});
$(document).mouseover(function(){
    alert("Mouse in window");
});

Picking up click events and other things outside the browser are not possible.