jquery/src/event.js

(function( jQuery ) {

var rformElems = /^(?:textarea|input|select)$/i,
	rtypenamespace = /^([^\.]*)?(?:\.(.+))?$/,
	rhoverHack = /\bhover(\.\S+)?/,
	rkeyEvent = /^key/,
	rmouseEvent = /^(?:mouse|contextmenu)|click/,
	rfocusMorph = /^(?:focusinfocus|focusoutblur)$/,
	rquickIs = /^(\w*)(?:#([\w\-]+))?(?:\.([\w\-]+))?$/,
	quickParse = function( selector ) {
		var quick = rquickIs.exec( selector );
		if ( quick ) {
			//   0  1    2   3
			// [ _, tag, id, class ]
			quick[1] = ( quick[1] || "" ).toLowerCase();
			quick[3] = quick[3] && new RegExp( "(?:^|\\s)" + quick[3] + "(?:\\s|$)" );
		}
		return quick;
	},
	quickIs = function( elem, m ) {
		return (
			(!m[1] || elem.nodeName.toLowerCase() === m[1]) &&
			(!m[2] || elem.id === m[2]) &&
			(!m[3] || m[3].test( elem.className ))
		);
	},
	hoverHack = function( events ) {
		return jQuery.event.special.hover ? events : events.replace( rhoverHack, "mouseenter$1 mouseleave$1" );
	};

/*
 * Helper functions for managing events -- not part of the public interface.
 * Props to Dean Edwards' addEvent library for many of the ideas.
 */
jQuery.event = {

	add: function( elem, types, handler, data, selector ) {

		var elemData, eventHandle, events,
			t, tns, type, namespaces, handleObj,
			handleObjIn, quick, handlers, special;

		// Don't attach events to noData or text/comment nodes (allow plain objects tho)
		if ( elem.nodeType === 3 || elem.nodeType === 8 || !types || !handler || !(elemData = jQuery._data( elem )) ) {
			return;
		}

		// Caller can pass in an object of custom data in lieu of the handler
		if ( handler.handler ) {
			handleObjIn = handler;
			handler = handleObjIn.handler;
		}

		// Make sure that the handler has a unique ID, used to find/remove it later
		if ( !handler.guid ) {
			handler.guid = jQuery.guid++;
		}

		// Init the element's event structure and main handler, if this is the first
		events = elemData.events;
		if ( !events ) {
			elemData.events = events = {};
		}
		eventHandle = elemData.handle;
		if ( !eventHandle ) {
			elemData.handle = eventHandle = function( e ) {
				// Discard the second event of a jQuery.event.trigger() and
				// when an event is called after a page has unloaded
				return typeof jQuery !== "undefined" && (!e || jQuery.event.triggered !== e.type) ?
					jQuery.event.dispatch.apply( eventHandle.elem, arguments ) :
					undefined;
			};
			// Add elem as a property of the handle fn to prevent a memory leak with IE non-native events
			eventHandle.elem = elem;
		}

		// Handle multiple events separated by a space
		// jQuery(...).bind("mouseover mouseout", fn);
		types = jQuery.trim( hoverHack(types) ).split( " " );
		for ( t = 0; t < types.length; t++ ) {

			tns = rtypenamespace.exec( types[t] ) || [];
			type = tns[1];
			namespaces = ( tns[2] || "" ).split( "." ).sort();

			// If event changes its type, use the special event handlers for the changed type
			special = jQuery.event.special[ type ] || {};

			// If selector defined, determine special event api type, otherwise given type
			type = ( selector ? special.delegateType : special.bindType ) || type;

			// Update special based on newly reset type
			special = jQuery.event.special[ type ] || {};

			// handleObj is passed to all event handlers
			handleObj = jQuery.extend({
				type: type,
				origType: tns[1],
				data: data,
				handler: handler,
				guid: handler.guid,
				selector: selector,
				quick: quickParse( selector ),
				namespace: namespaces.join(".")
			}, handleObjIn );

			// Init the event handler queue if we're the first
			handlers = events[ type ];
			if ( !handlers ) {
				handlers = events[ type ] = [];
				handlers.delegateCount = 0;

				// Only use addEventListener/attachEvent if the special events handler returns false
				if ( !special.setup || special.setup.call( elem, data, namespaces, eventHandle ) === false ) {
					// Bind the global event handler to the element
					if ( elem.addEventListener ) {
						elem.addEventListener( type, eventHandle, false );

					} else if ( elem.attachEvent ) {
						elem.attachEvent( "on" + type, eventHandle );
					}
				}
			}

			if ( special.add ) {
				special.add.call( elem, handleObj );

				if ( !handleObj.handler.guid ) {
					handleObj.handler.guid = handler.guid;
				}
			}

			// Add to the element's handler list, delegates in front
			if ( selector ) {
				handlers.splice( handlers.delegateCount++, 0, handleObj );
			} else {
				handlers.push( handleObj );
			}

			// Keep track of which events have ever been used, for event optimization
			jQuery.event.global[ type ] = true;
		}

		// Nullify elem to prevent memory leaks in IE
		elem = null;
	},

	global: {},

	// Detach an event or set of events from an element
	remove: function( elem, types, handler, selector ) {

		var elemData = jQuery.hasData( elem ) && jQuery._data( elem ),
			t, tns, type, namespaces, origCount,
			j, events, special, handle, eventType, handleObj;

		if ( !elemData || !(events = elemData.events) ) {
			return;
		}

		// Once for each type.namespace in types; type may be omitted
		types = jQuery.trim( hoverHack( types || "" ) ).split(" ");
		for ( t = 0; t < types.length; t++ ) {
			tns = rtypenamespace.exec( types[t] ) || [];
			type = tns[1];
			namespaces = tns[2];

			// Unbind all events (on this namespace, if provided) for the element
			if ( !type ) {
				namespaces = namespaces? "." + namespaces : "";
				for ( j in events ) {
					jQuery.event.remove( elem, j + namespaces, handler, selector );
				}
				continue;
			}

			special = jQuery.event.special[ type ] || {};
			type = ( selector? special.delegateType : special.bindType ) || type;
			eventType = events[ type ] || [];
			origCount = eventType.length;
			namespaces = namespaces ? new RegExp("(^|\\.)" + namespaces.split(".").sort().join("\\.(?:.*\\.)?") + "(\\.|$)") : null;

			// Only need to loop for special events or selective removal
			if ( handler || namespaces || selector || special.remove ) {
				for ( j = 0; j < eventType.length; j++ ) {
					handleObj = eventType[ j ];

					if ( !handler || handler.guid === handleObj.guid ) {
						if ( !namespaces || namespaces.test( handleObj.namespace ) ) {
							if ( !selector || selector === handleObj.selector || selector === "**" && handleObj.selector ) {
								eventType.splice( j--, 1 );

								if ( handleObj.selector ) {
									eventType.delegateCount--;
								}
								if ( special.remove ) {
									special.remove.call( elem, handleObj );
								}
							}
						}
					}
				}
			} else {
				// Removing all events
				eventType.length = 0;
			}

			// Remove generic event handler if we removed something and no more handlers exist
			// (avoids potential for endless recursion during removal of special event handlers)
			if ( eventType.length === 0 && origCount !== eventType.length ) {
				if ( !special.teardown || special.teardown.call( elem, namespaces ) === false ) {
					jQuery.removeEvent( elem, type, elemData.handle );
				}

				delete events[ type ];
			}
		}

		// Remove the expando if it's no longer used
		if ( jQuery.isEmptyObject( events ) ) {
			handle = elemData.handle;
			if ( handle ) {
				handle.elem = null;
			}

			// removeData also checks for emptiness and clears the expando if empty
			// so use it instead of delete
			jQuery.removeData( elem, [ "events", "handle" ], true );
		}
	},

	// Events that are safe to short-circuit if no handlers are attached.
	// Native DOM events should not be added, they may have inline handlers.
	customEvent: {
		"getData": true,
		"setData": true,
		"changeData": true
	},

	trigger: function( event, data, elem, onlyHandlers ) {
		// Don't do events on text and comment nodes
		if ( elem && (elem.nodeType === 3 || elem.nodeType === 8) ) {
			return;
		}

		// Event object or event type
		var type = event.type || event,
			namespaces = [],
			cache, exclusive, i, cur, old, ontype, special, handle, eventPath, bubbleType;

		// focus/blur morphs to focusin/out; ensure we're not firing them right now
		if ( rfocusMorph.test( type + jQuery.event.triggered ) ) {
			return;
		}

		if ( type.indexOf( "!" ) >= 0 ) {
			// Exclusive events trigger only for the exact event (no namespaces)
			type = type.slice(0, -1);
			exclusive = true;
		}

		if ( type.indexOf( "." ) >= 0 ) {
			// Namespaced trigger; create a regexp to match event type in handle()
			namespaces = type.split(".");
			type = namespaces.shift();
			namespaces.sort();
		}

		if ( (!elem || jQuery.event.customEvent[ type ]) && !jQuery.event.global[ type ] ) {
			// No jQuery handlers for this event type, and it can't have inline handlers
			return;
		}

		// Caller can pass in an Event, Object, or just an event type string
		event = typeof event === "object" ?
			// jQuery.Event object
			event[ jQuery.expando ] ? event :
			// Object literal
			new jQuery.Event( type, event ) :
			// Just the event type (string)
			new jQuery.Event( type );

		event.type = type;
		event.isTrigger = true;
		event.exclusive = exclusive;
		event.namespace = namespaces.join( "." );
		event.namespace_re = event.namespace? new RegExp("(^|\\.)" + namespaces.join("\\.(?:.*\\.)?") + "(\\.|$)") : null;
		ontype = type.indexOf( ":" ) < 0 ? "on" + type : "";

		// triggerHandler() and global events don't bubble or run the default action
		if ( onlyHandlers || !elem ) {
			event.preventDefault();
		}

		// Handle a global trigger
		if ( !elem ) {

			// TODO: Stop taunting the data cache; remove global events and always attach to document
			cache = jQuery.cache;
			for ( i in cache ) {
				if ( cache[ i ].events && cache[ i ].events[ type ] ) {
					jQuery.event.trigger( event, data, cache[ i ].handle.elem, true );
				}
			}
			return;
		}

		// Clean up the event in case it is being reused
		event.result = undefined;
		if ( !event.target ) {
			event.target = elem;
		}

		// Clone any incoming data and prepend the event, creating the handler arg list
		data = data != null ? jQuery.makeArray( data ) : [];
		data.unshift( event );

		// Allow special events to draw outside the lines
		special = jQuery.event.special[ type ] || {};
		if ( special.trigger && special.trigger.apply( elem, data ) === false ) {
			return;
		}

		// Determine event propagation path in advance, per W3C events spec (#9951)
		// Bubble up to document, then to window; watch for a global ownerDocument var (#9724)
		eventPath = [[ elem, special.bindType || type ]];
		if ( !onlyHandlers && !special.noBubble && !jQuery.isWindow( elem ) ) {

			bubbleType = special.delegateType || type;
			cur = rfocusMorph.test( bubbleType + type ) ? elem : elem.parentNode;
			old = null;
			for ( ; cur; cur = cur.parentNode ) {
				eventPath.push([ cur, bubbleType ]);
				old = cur;
			}

			// Only add window if we got to document (e.g., not plain obj or detached DOM)
			if ( old && old === elem.ownerDocument ) {
				eventPath.push([ old.defaultView || old.parentWindow || window, bubbleType ]);
			}
		}

		// Fire handlers on the event path
		for ( i = 0; i < eventPath.length; i++ ) {

			cur = eventPath[i][0];
			event.type = eventPath[i][1];

			handle = ( jQuery._data( cur, "events" ) || {} )[ event.type ] && jQuery._data( cur, "handle" );
			if ( handle ) {
				handle.apply( cur, data );
			}
			// Note that this is a bare JS function and not a jQuery handler
			handle = ontype && cur[ ontype ];
			if ( handle && jQuery.acceptData( cur ) && handle.apply( cur, data ) === false ) {
				event.preventDefault();
			}

			if ( event.isPropagationStopped() ) {
				break;
			}
		}
		event.type = type;

		// If nobody prevented the default action, do it now
		if ( !event.isDefaultPrevented() ) {

			if ( (!special._default || special._default.apply( elem.ownerDocument, data ) === false) &&
				!(type === "click" && jQuery.nodeName( elem, "a" )) && jQuery.acceptData( elem ) ) {

				// Call a native DOM method on the target with the same name name as the event.
				// Can't use an .isFunction() check here because IE6/7 fails that test.
				// Don't do default actions on window, that's where global variables be (#6170)
				// IE<9 dies on focus/blur to hidden element (#1486)
				if ( ontype && elem[ type ] && ((type !== "focus" && type !== "blur") || event.target.offsetWidth !== 0) && !jQuery.isWindow( elem ) ) {

					// Don't re-trigger an onFOO event when we call its FOO() method
					old = elem[ ontype ];

					if ( old ) {
						elem[ ontype ] = null;
					}

					// Prevent re-triggering of the same event, since we already bubbled it above
					jQuery.event.triggered = type;
					elem[ type ]();
					jQuery.event.triggered = undefined;

					if ( old ) {
						elem[ ontype ] = old;
					}
				}
			}
		}

		return event.result;
	},

	dispatch: function( event ) {

		// Make a writable jQuery.Event from the native event object
		event = jQuery.event.fix( event || window.event );

		var handlers = ( (jQuery._data( this, "events" ) || {} )[ event.type ] || []),
			delegateCount = handlers.delegateCount,
			args = [].slice.call( arguments, 0 ),
			run_all = !event.exclusive && !event.namespace,
			handlerQueue = [],
			i, j, cur, jqcur, ret, selMatch, matched, matches, handleObj, sel, related;

		// Use the fix-ed jQuery.Event rather than the (read-only) native event
		args[0] = event;
		event.delegateTarget = this;

		// Determine handlers that should run if there are delegated events
		// Avoid disabled elements in IE (#6911) and non-left-click bubbling in Firefox (#3861)
		if ( delegateCount && !event.target.disabled && !(event.button && event.type === "click") ) {

			// Pregenerate a single jQuery object for reuse with .is()
			jqcur = jQuery(this);
			jqcur.context = this.ownerDocument || this;

			for ( cur = event.target; cur != this; cur = cur.parentNode || this ) {
				selMatch = {};
				matches = [];
				jqcur[0] = cur;
				for ( i = 0; i < delegateCount; i++ ) {
					handleObj = handlers[ i ];
					sel = handleObj.selector;

					if ( selMatch[ sel ] === undefined ) {
						selMatch[ sel ] = (
							handleObj.quick ? quickIs( cur, handleObj.quick ) : jqcur.is( sel )
						);
					}
					if ( selMatch[ sel ] ) {
						matches.push( handleObj );
					}
				}
				if ( matches.length ) {
					handlerQueue.push({ elem: cur, matches: matches });
				}
			}
		}

		// Add the remaining (directly-bound) handlers
		if ( handlers.length > delegateCount ) {
			handlerQueue.push({ elem: this, matches: handlers.slice( delegateCount ) });
		}

		// Run delegates first; they may want to stop propagation beneath us
		for ( i = 0; i < handlerQueue.length && !event.isPropagationStopped(); i++ ) {
			matched = handlerQueue[ i ];
			event.currentTarget = matched.elem;

			for ( j = 0; j < matched.matches.length && !event.isImmediatePropagationStopped(); j++ ) {
				handleObj = matched.matches[ j ];

				// Triggered event must either 1) be non-exclusive and have no namespace, or
				// 2) have namespace(s) a subset or equal to those in the bound event (both can have no namespace).
				if ( run_all || (!event.namespace && !handleObj.namespace) || event.namespace_re && event.namespace_re.test( handleObj.namespace ) ) {

					event.data = handleObj.data;
					event.handleObj = handleObj;

					ret = ( (jQuery.event.special[ handleObj.origType ] || {}).handle || handleObj.handler )
							.apply( matched.elem, args );

					if ( ret !== undefined ) {
						event.result = ret;
						if ( ret === false ) {
							event.preventDefault();
							event.stopPropagation();
						}
					}
				}
			}
		}

		return event.result;
	},

	// Includes some event props shared by KeyEvent and MouseEvent
	// *** attrChange attrName relatedNode srcElement  are not normalized, non-W3C, deprecated, will be removed in 1.8 ***
	props: "attrChange attrName relatedNode srcElement altKey bubbles cancelable ctrlKey currentTarget eventPhase metaKey relatedTarget shiftKey target timeStamp view which".split(" "),

	fixHooks: {},

	keyHooks: {
		props: "char charCode key keyCode".split(" "),
		filter: function( event, original ) {

			// Add which for key events
			if ( event.which == null ) {
				event.which = original.charCode != null ? original.charCode : original.keyCode;
			}

			return event;
		}
	},

	mouseHooks: {
		props: "button buttons clientX clientY fromElement offsetX offsetY pageX pageY screenX screenY toElement".split(" "),
		filter: function( event, original ) {
			var eventDoc, doc, body,
				button = original.button,
				fromElement = original.fromElement;

			// Calculate pageX/Y if missing and clientX/Y available
			if ( event.pageX == null && original.clientX != null ) {
				eventDoc = event.target.ownerDocument || document;
				doc = eventDoc.documentElement;
				body = eventDoc.body;

				event.pageX = original.clientX + ( doc && doc.scrollLeft || body && body.scrollLeft || 0 ) - ( doc && doc.clientLeft || body && body.clientLeft || 0 );
				event.pageY = original.clientY + ( doc && doc.scrollTop  || body && body.scrollTop  || 0 ) - ( doc && doc.clientTop  || body && body.clientTop  || 0 );
			}

			// Add relatedTarget, if necessary
			if ( !event.relatedTarget && fromElement ) {
				event.relatedTarget = fromElement === event.target ? original.toElement : fromElement;
			}

			// Add which for click: 1 === left; 2 === middle; 3 === right
			// Note: button is not normalized, so don't use it
			if ( !event.which && button !== undefined ) {
				event.which = ( button & 1 ? 1 : ( button & 2 ? 3 : ( button & 4 ? 2 : 0 ) ) );
			}

			return event;
		}
	},

	fix: function( event ) {
		if ( event[ jQuery.expando ] ) {
			return event;
		}

		// Create a writable copy of the event object and normalize some properties
		var i, prop,
			originalEvent = event,
			fixHook = jQuery.event.fixHooks[ event.type ] || {},
			copy = fixHook.props ? this.props.concat( fixHook.props ) : this.props;

		event = jQuery.Event( originalEvent );

		for ( i = copy.length; i; ) {
			prop = copy[ --i ];
			event[ prop ] = originalEvent[ prop ];
		}

		// Fix target property, if necessary (#1925, IE 6/7/8 & Safari2)
		if ( !event.target ) {
			event.target = originalEvent.srcElement || document;
		}

		// Target should not be a text node (#504, Safari)
		if ( event.target.nodeType === 3 ) {
			event.target = event.target.parentNode;
		}

		// For mouse/key events; add metaKey if it's not there (#3368, IE6/7/8)
		if ( event.metaKey === undefined ) {
			event.metaKey = event.ctrlKey;
		}

		return fixHook.filter? fixHook.filter( event, originalEvent ) : event;
	},

	special: {
		ready: {
			// Make sure the ready event is setup
			setup: jQuery.bindReady
		},

		load: {
			// Prevent triggered image.load events from bubbling to window.load
			noBubble: true
		},

		focus: {
			delegateType: "focusin"
		},
		blur: {
			delegateType: "focusout"
		},

		beforeunload: {
			setup: function( data, namespaces, eventHandle ) {
				// We only want to do this special case on windows
				if ( jQuery.isWindow( this ) ) {
					this.onbeforeunload = eventHandle;
				}
			},

			teardown: function( namespaces, eventHandle ) {
				if ( this.onbeforeunload === eventHandle ) {
					this.onbeforeunload = null;
				}
			}
		}
	},

	simulate: function( type, elem, event, bubble ) {
		// Piggyback on a donor event to simulate a different one.
		// Fake originalEvent to avoid donor's stopPropagation, but if the
		// simulated event prevents default then we do the same on the donor.
		var e = jQuery.extend(
			new jQuery.Event(),
			event,
			{ type: type,
				isSimulated: true,
				originalEvent: {}
			}
		);
		if ( bubble ) {
			jQuery.event.trigger( e, null, elem );
		} else {
			jQuery.event.dispatch.call( elem, e );
		}
		if ( e.isDefaultPrevented() ) {
			event.preventDefault();
		}
	}
};

// Some plugins are using, but it's undocumented/deprecated and will be removed.
// The 1.7 special event interface should provide all the hooks needed now.
jQuery.event.handle = jQuery.event.dispatch;

jQuery.removeEvent = document.removeEventListener ?
	function( elem, type, handle ) {
		if ( elem.removeEventListener ) {
			elem.removeEventListener( type, handle, false );
		}
	} :
	function( elem, type, handle ) {
		if ( elem.detachEvent ) {
			elem.detachEvent( "on" + type, handle );
		}
	};

jQuery.Event = function( src, props ) {
	// Allow instantiation without the 'new' keyword
	if ( !(this instanceof jQuery.Event) ) {
		return new jQuery.Event( src, props );
	}

	// Event object
	if ( src && src.type ) {
		this.originalEvent = src;
		this.type = src.type;

		// Events bubbling up the document may have been marked as prevented
		// by a handler lower down the tree; reflect the correct value.
		this.isDefaultPrevented = ( src.defaultPrevented || src.returnValue === false ||
			src.getPreventDefault && src.getPreventDefault() ) ? returnTrue : returnFalse;

	// Event type
	} else {
		this.type = src;
	}

	// Put explicitly provided properties onto the event object
	if ( props ) {
		jQuery.extend( this, props );
	}

	// Create a timestamp if incoming event doesn't have one
	this.timeStamp = src && src.timeStamp || jQuery.now();

	// Mark it as fixed
	this[ jQuery.expando ] = true;
};

function returnFalse() {
	return false;
}
function returnTrue() {
	return true;
}

// jQuery.Event is based on DOM3 Events as specified by the ECMAScript Language Binding
// http://www.w3.org/TR/2003/WD-DOM-Level-3-Events-20030331/ecma-script-binding.html
jQuery.Event.prototype = {
	preventDefault: function() {
		this.isDefaultPrevented = returnTrue;

		var e = this.originalEvent;
		if ( !e ) {
			return;
		}

		// if preventDefault exists run it on the original event
		if ( e.preventDefault ) {
			e.preventDefault();

		// otherwise set the returnValue property of the original event to false (IE)
		} else {
			e.returnValue = false;
		}
	},
	stopPropagation: function() {
		this.isPropagationStopped = returnTrue;

		var e = this.originalEvent;
		if ( !e ) {
			return;
		}
		// if stopPropagation exists run it on the original event
		if ( e.stopPropagation ) {
			e.stopPropagation();
		}
		// otherwise set the cancelBubble property of the original event to true (IE)
		e.cancelBubble = true;
	},
	stopImmediatePropagation: function() {
		this.isImmediatePropagationStopped = returnTrue;
		this.stopPropagation();
	},
	isDefaultPrevented: returnFalse,
	isPropagationStopped: returnFalse,
	isImmediatePropagationStopped: returnFalse
};

// Create mouseenter/leave events using mouseover/out and event-time checks
jQuery.each({
	mouseenter: "mouseover",
	mouseleave: "mouseout"
}, function( orig, fix ) {
	jQuery.event.special[ orig ] = {
		delegateType: fix,
		bindType: fix,

		handle: function( event ) {
			var target = this,
				related = event.relatedTarget,
				handleObj = event.handleObj,
				selector = handleObj.selector,
				ret;

			// For mousenter/leave call the handler if related is outside the target.
			// NB: No relatedTarget if the mouse left/entered the browser window
			if ( !related || (related !== target && !jQuery.contains( target, related )) ) {
				event.type = handleObj.origType;
				ret = handleObj.handler.apply( this, arguments );
				event.type = fix;
			}
			return ret;
		}
	};
});

// IE submit delegation
if ( !jQuery.support.submitBubbles ) {

	jQuery.event.special.submit = {
		setup: function() {
			// Only need this for delegated form submit events
			if ( jQuery.nodeName( this, "form" ) ) {
				return false;
			}

			// Lazy-add a submit handler when a descendant form may potentially be submitted
			jQuery.event.add( this, "click._submit keypress._submit", function( e ) {
				// Node name check avoids a VML-related crash in IE (#9807)
				var elem = e.target,
					form = jQuery.nodeName( elem, "input" ) || jQuery.nodeName( elem, "button" ) ? elem.form : undefined;
				if ( form && !form._submit_attached ) {
					jQuery.event.add( form, "submit._submit", function( event ) {
						// Form was submitted, bubble the event up the tree
						if ( this.parentNode ) {
							jQuery.event.simulate( "submit", this.parentNode, event, true );
						}
					});
					form._submit_attached = true;
				}
			});
			// return undefined since we don't need an event listener
		},

		teardown: function() {
			// Only need this for delegated form submit events
			if ( jQuery.nodeName( this, "form" ) ) {
				return false;
			}

			// Remove delegated handlers; cleanData eventually reaps submit handlers attached above
			jQuery.event.remove( this, "._submit" );
		}
	};
}

// IE change delegation and checkbox/radio fix
if ( !jQuery.support.changeBubbles ) {

	jQuery.event.special.change = {

		setup: function() {

			if ( rformElems.test( this.nodeName ) ) {
				// IE doesn't fire change on a check/radio until blur; trigger it on click
				// after a propertychange. Eat the blur-change in special.change.handle.
				// This still fires onchange a second time for check/radio after blur.
				if ( this.type === "checkbox" || this.type === "radio" ) {
					jQuery.event.add( this, "propertychange._change", function( event ) {
						if ( event.originalEvent.propertyName === "checked" ) {
							this._just_changed = true;
						}
					});
					jQuery.event.add( this, "click._change", function( event ) {
						if ( this._just_changed ) {
							this._just_changed = false;
							jQuery.event.simulate( "change", this, event, true );
						}
					});
				}
				return false;
			}
			// Delegated event; lazy-add a change handler on descendant inputs
			jQuery.event.add( this, "beforeactivate._change", function( e ) {
				var elem = e.target;

				if ( rformElems.test( elem.nodeName ) && !elem._change_attached ) {
					jQuery.event.add( elem, "change._change", function( event ) {
						if ( this.parentNode && !event.isSimulated ) {
							jQuery.event.simulate( "change", this.parentNode, event, true );
						}
					});
					elem._change_attached = true;
				}
			});
		},

		handle: function( event ) {
			var elem = event.target;

			// Swallow native change events from checkbox/radio, we already triggered them above
			if ( this !== elem || event.isSimulated || event.isTrigger || (elem.type !== "radio" && elem.type !== "checkbox") ) {
				return event.handleObj.handler.apply( this, arguments );
			}
		},

		teardown: function() {
			jQuery.event.remove( this, "._change" );

			return rformElems.test( this.nodeName );
		}
	};
}

// Create "bubbling" focus and blur events
if ( !jQuery.support.focusinBubbles ) {
	jQuery.each({ focus: "focusin", blur: "focusout" }, function( orig, fix ) {

		// Attach a single capturing handler while someone wants focusin/focusout
		var attaches = 0,
			handler = function( event ) {
				jQuery.event.simulate( fix, event.target, jQuery.event.fix( event ), true );
			};

		jQuery.event.special[ fix ] = {
			setup: function() {
				if ( attaches++ === 0 ) {
					document.addEventListener( orig, handler, true );
				}
			},
			teardown: function() {
				if ( --attaches === 0 ) {
					document.removeEventListener( orig, handler, true );
				}
			}
		};
	});
}

jQuery.fn.extend({

	on: function( types, selector, data, fn, /*INTERNAL*/ one ) {
		var origFn, type;

		// Types can be a map of types/handlers
		if ( typeof types === "object" ) {
			// ( types-Object, selector, data )
			if ( typeof selector !== "string" ) {
				// ( types-Object, data )
				data = selector;
				selector = undefined;
			}
			for ( type in types ) {
				this.on( type, selector, data, types[ type ], one );
			}
			return this;
		}

		if ( data == null && fn == null ) {
			// ( types, fn )
			fn = selector;
			data = selector = undefined;
		} else if ( fn == null ) {
			if ( typeof selector === "string" ) {
				// ( types, selector, fn )
				fn = data;
				data = undefined;
			} else {
				// ( types, data, fn )
				fn = data;
				data = selector;
				selector = undefined;
			}
		}
		if ( fn === false ) {
			fn = returnFalse;
		} else if ( !fn ) {
			return this;
		}

		if ( one === 1 ) {
			origFn = fn;
			fn = function( event ) {
				// Can use an empty set, since event contains the info
				jQuery().off( event );
				return origFn.apply( this, arguments );
			};
			// Use same guid so caller can remove using origFn
			fn.guid = origFn.guid || ( origFn.guid = jQuery.guid++ );
		}
		return this.each( function() {
			jQuery.event.add( this, types, fn, data, selector );
		});
	},
	one: function( types, selector, data, fn ) {
		return this.on.call( this, types, selector, data, fn, 1 );
	},
	off: function( types, selector, fn ) {
		if ( types && types.preventDefault && types.handleObj ) {
			// ( event )  dispatched jQuery.Event
			var handleObj = types.handleObj;
			jQuery( types.delegateTarget ).off(
				handleObj.namespace? handleObj.type + "." + handleObj.namespace : handleObj.type,
				handleObj.selector,
				handleObj.handler
			);
			return this;
		}
		if ( typeof types === "object" ) {
			// ( types-object [, selector] )
			for ( var type in types ) {
				this.off( type, selector, types[ type ] );
			}
			return this;
		}
		if ( selector === false || typeof selector === "function" ) {
			// ( types [, fn] )
			fn = selector;
			selector = undefined;
		}
		if ( fn === false ) {
			fn = returnFalse;
		}
		return this.each(function() {
			jQuery.event.remove( this, types, fn, selector );
		});
	},

	bind: function( types, data, fn ) {
		return this.on( types, null, data, fn );
	},
	unbind: function( types, fn ) {
		return this.off( types, null, fn );
	},

	live: function( types, data, fn ) {
		jQuery( this.context ).on( types, this.selector, data, fn );
		return this;
	},
	die: function( types, fn ) {
		jQuery( this.context ).off( types, this.selector || "**", fn );
		return this;
	},

	delegate: function( selector, types, data, fn ) {
		return this.on( types, selector, data, fn );
	},
	undelegate: function( selector, types, fn ) {
		// ( namespace ) or ( selector, types [, fn] )
		return arguments.length == 1? this.off( selector, "**" ) : this.off( types, selector, fn );
	},

	trigger: function( type, data ) {
		return this.each(function() {
			jQuery.event.trigger( type, data, this );
		});
	},
	triggerHandler: function( type, data ) {
		if ( this[0] ) {
			return jQuery.event.trigger( type, data, this[0], true );
		}
	},

	toggle: function( fn ) {
		// Save reference to arguments for access in closure
		var args = arguments,
			guid = fn.guid || jQuery.guid++,
			i = 0,
			toggler = function( event ) {
				// Figure out which function to execute
				var lastToggle = ( jQuery._data( this, "lastToggle" + fn.guid ) || 0 ) % i;
				jQuery._data( this, "lastToggle" + fn.guid, lastToggle + 1 );

				// Make sure that clicks stop
				event.preventDefault();

				// and execute the function
				return args[ lastToggle ].apply( this, arguments ) || false;
			};

		// link all the functions, so any of them can unbind this click handler
		toggler.guid = guid;
		while ( i < args.length ) {
			args[ i++ ].guid = guid;
		}

		return this.click( toggler );
	},

	hover: function( fnOver, fnOut ) {
		return this.mouseenter( fnOver ).mouseleave( fnOut || fnOver );
	}
});

jQuery.each( ("blur focus focusin focusout load resize scroll unload click dblclick " +
	"mousedown mouseup mousemove mouseover mouseout mouseenter mouseleave " +
	"change select submit keydown keypress keyup error contextmenu").split(" "), function( i, name ) {

	// Handle event binding
	jQuery.fn[ name ] = function( data, fn ) {
		if ( fn == null ) {
			fn = data;
			data = null;
		}

		return arguments.length > 0 ?
			this.on( name, null, data, fn ) :
			this.trigger( name );
	};

	if ( jQuery.attrFn ) {
		jQuery.attrFn[ name ] = true;
	}

	if ( rkeyEvent.test( name ) ) {
		jQuery.event.fixHooks[ name ] = jQuery.event.keyHooks;
	}

	if ( rmouseEvent.test( name ) ) {
		jQuery.event.fixHooks[ name ] = jQuery.event.mouseHooks;
	}
});

})( jQuery );