jquery: keydown, keyup, small snippet, why isn't this working?

Why isn't this working?

var holdingctrl = false;
$(document).keydown("q",fun开发者_StackOverflow社区ction(e) {
 if(holdingctrl == true) 
 alert("Holding CTRL and pressing Q: Success.");
 e.preventDefault();
});

$(document).keyup("q",function(e) {
 holdingctrl == false 
});

This example below works just fine, but what am i doing wrong above?

$(document).keyup("q",function(e) {
 alert("ONLY pressing Q: Success.");
});

You needed a way to determine if control was currently being pressed (e.ctrlKey) - This should work for you:

  $(document).keyup(function(e) 
    { 
        if (e.ctrlKey && e.keyCode == 81) 
        {
            alert("CTRL+Q Pressed");
        }
    });

Working Demo here

Depends on what you're trying to accomplish.

Couple notes:

• the event data you're passing should be an object instead of a single character.
• the keyup handler isn't doing anything with the == comparison. You probably meant to use an = assignment.

$(document).keyup( { theChar:"q" }, function(e) {
   holdingctrl = false;
});

I'm not entirely sure what you're trying to do with this snippet, but you can check whether ctrl is pressed by using the event.ctrlKey property:

$(document).keydown(function(e) {
    if (e.ctrlKey && (e.keyCode == 81)) { // ctrl + q
        alert("Pressing Q and ctrl: Success.");
    }
});