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