File size: 1,760 Bytes
b11323b | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 | (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;
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(HTMLElement.prototype, 'classList', function () {
return new DOMTokenList(this);
});
})();
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