Why doesn't the crash work?

Question

This simple code does not work! http://jsfiddle.net/FPcFn/

$(document).keydown(function(e){ switch (e.which){ case 37: alert("37"); } }); 

Why? What could go wrong?

Answer 1

It works. Click in the output window and press the left arrow.

Answer 2

Use window instead of document .

 $(window).keydown(function(e){ .. } 

PS: Recommended to use document . keydown event is available both with documents and with a window. Take a look at the tables.