(function() {
var Lang = Y.Lang,
delegates = {},
resolveTextNode = function(n) {
try {
if (n && 3 == n.nodeType) {
return n.parentNode;
}
} catch(e) { }
return n;
},
_worker = function(delegateKey, e, el) {
var target = resolveTextNode((e.target || e.srcElement)),
tests = delegates[delegateKey],
spec,
ename,
elements,
nElements,
matched,
ev,
i;
for (spec in tests) {
if (tests.hasOwnProperty(spec)) {
ename = tests[spec];
elements = Y.Selector.query(spec, el);
nElements = elements.length;
if (nElements > 0) {
i = elements.length - 1;
do {
matched = elements[i];
if (matched === target || Y.DOM.contains(matched, target)) {
if (!ev) {
ev = new Y.DOMEventFacade(e, el);
ev.container = ev.currentTarget;
}
ev.currentTarget = Y.Node.get(matched);
Y.fire(ename, ev);
}
}
while (i--);
}
}
}
},
attach = function (type, key, element) {
Y.Event._attach([type, function (e) {
_worker(key, (e || window.event), element);
}, element], { facade: false });
},
_sanitize = Y.cached(function(str) {
return str.replace(/[|,:]/g, '~');
});
/**
* Sets up a delegated listener container.
* @event delegate
* @param type {string} 'delegate'
* @param fn {string} the function to execute
* @param el {string|node} the element that is the delegation container
* @param delegateType {string} the event type to delegate
* @param spec {string} a selector that must match the target of the
* event.
* @return {EventHandle} the detach handle
* @for YUI
*/
Y.Env.evt.plugins.delegate = {
on: function(type, fn, el, delegateType, spec) {
if (!spec) {
Y.log('delegate: no spec, nothing to do', 'warn', 'event');
return false;
}
// identifier to target the container
var guid = (Lang.isString(el) ? el : Y.stamp(el)),
// the custom event for the delegation spec
ename = 'delegate:' + guid + delegateType + _sanitize(spec),
// the key to the listener for the event type and container
delegateKey = delegateType + guid,
a = Y.Array(arguments, 0, true),
element;
if (!(delegateKey in delegates)) {
if (Lang.isString(el)) { // Selector
element = Y.Selector.query(el);
}
else { // Node instance
element = Y.Node.getDOMNode(el);
}
if (Lang.isArray(element)) {
Y.Array.each(element, function (v) {
attach(delegateType, delegateKey, v);
});
}
else {
attach(delegateType, delegateKey, element);
}
delegates[delegateKey] = {};
}
delegates[delegateKey][spec] = ename;
a[0] = ename;
// remove element, delegation spec and context object from the args
a.splice(2, 3);
// subscribe to the custom event for the delegation spec
return Y.on.apply(Y, a);
}
};
})();