classie.js

/*!
 * classie - class helper functions
 * from bonzo https://github.com/ded/bonzo
 *
 * classie.has( elem, 'my-class' ) -> true/false
 * classie.add( elem, 'my-new-class' )
 * classie.remove( elem, 'my-unwanted-class' )
 * classie.toggle( elem, 'my-class' )
 */
// jscs:disable
/*jshint browser: true, strict: true, undef: true */
/*global define: false */

(function(window) {

"use strict";

// class helper functions from bonzo https://github.com/ded/bonzo

function classReg(className) {
	return new RegExp("(^|\\s+)" + className + "(\\s+|$)");
}

// classList support for class management
// altho to be fair, the api sucks because it won't accept multiple classes at once
var hasClass, addClass, removeClass;

if ("classList" in document.documentElement) {
	hasClass = function(elem, c) {
		return elem.classList.contains(c);
	};
	addClass = function(elem, c) {
		elem.classList.add(c);
	};
	removeClass = function(elem, c) {
		elem.classList.remove(c);
	};
} else {
	hasClass = function(elem, c) {
		return classReg(c).test(elem.className);
	};
	addClass = function(elem, c) {
		if (!hasClass(elem, c)) {
			elem.className = elem.className + " " + c;
		}
	};
	removeClass = function(elem, c) {
		elem.className = elem.className.replace(classReg(c), " ");
	};
}

function toggleClass(elem, c) {
	var fn = hasClass(elem, c) ? removeClass : addClass;
	fn(elem, c);
}

var classie = {
	// full names
	hasClass: hasClass,
	addClass: addClass,
	removeClass: removeClass,
	toggleClass: toggleClass,
	// short names
	has: hasClass,
	add: addClass,
	remove: removeClass,
	toggle: toggleClass
};

// transport
if (typeof define === "function" && define.amd) {
	// AMD
	define(classie);
} else {
	// browser global
	window.classie = classie;
}

})(window);