A simple jQuery function to bind key input combinations to a function.

helpy.combo.js

/*
 * @author	Helpy.xyz
 * @version	1.0.1
 * @info	A simple jQuery function to bind key input combinations to a function.
 * @todo	Implement SHIFT, CTRL and ALT keys.
 */

var combo = {

	init:function(selector) {
		var that = this;

		if(!selector) {
			console.warn('You need to bind Combo to a DOM element');
			return false;
		}

		that.listen = selector;

		$(that.listen).bind('keypress', function(e) {
			var code = e.keyCode || e.which;

			if(that.activeKey) {
				if(that.combination[that.activeKey] && $.isFunction(that.combination[that.activeKey][code])) {
					that.combination[that.activeKey][code]();
					that.activeKey = false;
				} else {
					if(that.counter >= 2) {
						that.activeKey = code;
					} else {
						that.counter++;
					}
				}
			} else {
				that.activeKey = code;

			}
		});
	},

	on:function(keyA, keyB, func) {
		var that = this;

		keyA = $.isNumeric(keyA) ? keyA : keyA.charCodeAt(0);
		keyB = $.isNumeric(keyB) ? keyB : keyB.charCodeAt(0);

		that.combination[keyA] = {};
		that.combination[keyA][keyB] = func;
	},

};

combo.listen = '';
combo.counter = 0;
combo.activeKey = false;
combo.combination = {};