Backwards compatible classList functions

classList.js

/**
 * Check element has a certain classname
 * We cannot use classList yet because of browser support
 * @param  {Object}  ele DOM element
 * @param  {String}  cls Classname
 * @return {Boolean}     True is classname is found
 */
function hasClass(ele,cls) {
	if (ele === null || cls === '') return false;
	return ele.className.match(new RegExp('(\\s|^)'+cls+'(\\s|$)'));
}

/**
 * Remove class from element
 * @param  {Object} ele DOM element
 * @param  {String} cls Classname
 */
function removeClass(ele,cls) {
	if (hasClass(ele,cls)) {
		var reg = new RegExp('(\\s|^)'+cls+'(\\s|$)');
		ele.className=ele.className.replace(reg,' ');
	}
}

/**
 * Toggle classname
 * @param  {Object} elem DOM element
 * @param  {String} cl   Classname to toggle
 * @return {Object}      Same DOM element with/without given classname
 */
function toggleClass(elem, cl) {
	if (elem.className.indexOf(cl) != -1) {
		elem.className = elem.className.replace(cl, '');
	} else {
		elem.className += ' ' + cl;
	}
}