javascript - Detect multiple keys on single keypress event in jQuery

Question

Is it at all possible to combine a mixture of keypress' to fire a single event?

$(document).keyup(function(e){
    if (e.keyCode == 68 && e.keyCode == 69 && e.keyCode == 86) {
        alert('oh hai');
    }
});

I've tried it in Chrome but the event doesn't fire.

Call me crazy but I am writing a Chrome extension and want to push D+E+V keys together to force it into a hidden developer mode.

Answer 1

If you want to detect that the d, e, and v keys were all down at the same time, you have to watch both keydown and keyup and keep a map of the ones that are down. When they're all down, fire your event.

For example: Live copy | source

var map = {68: false, 69: false, 86: false};
$(document).keydown(function(e) {
    if (e.keyCode in map) {
        map[e.keyCode] = true;
        if (map[68] && map[69] && map[86]) {
            // FIRE EVENT
        }
    }
}).keyup(function(e) {
    if (e.keyCode in map) {
        map[e.keyCode] = false;
    }
});

I assume you don't care what order they're pressed down in (as that would be a pain to reliably press) as long as they're all down at the same time at some point.