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(function () {
if (typeof window.Element === "undefined" || "classList" in document.documentElement) return;
var prototype = Array.prototype,
push = prototype.push,
splice = prototype.splice,
join = prototype.join;
function DOMTokenList(el) {
this.el = el;
// The className needs to be trimmed and split on whitespace
// to retrieve a list of classes.
var classes = el.className.replace(/^\s+|\s+$/g,'').split(/\s+/);
for (var i = 0; i < classes.length; i++) {
push.call(this, classes[i]);
}
};
DOMTokenList.prototype = {
add: function(token) {
if(this.contains(token)) return;
push.call(this, token);
this.el.className = this.toString();
},
contains: function(token) {
return this.el.className.indexOf(token) != -1;
},
item: function(index) {
return this[index] || null;
},
remove: function(token) {
if (!this.contains(token)) return;
for (var i = 0; i < this.length; i++) {
if (this[i] == token) break;
}
splice.call(this, i, 1);
this.el.className = this.toString();
},
toString: function() {
return join.call(this, ' ');
},
toggle: function(token) {
if (!this.contains(token)) {
this.add(token);
} else {
this.remove(token);
}
return this.contains(token);
}
};
window.DOMTokenList = DOMTokenList;
function defineElementGetter (obj, prop, getter) {
if (Object.defineProperty) {
Object.defineProperty(obj, prop,{
get : getter
});
} else {
obj.__defineGetter__(prop, getter);
}
}
defineElementGetter(Element.prototype, 'classList', function () {
return new DOMTokenList(this);
});
})();