Fixes memory leaks relating to events in IE with page unload and with jQuery...

Fixes memory leaks relating to events in IE with page unload and with jQuery methods remove, html and empty (#1610, #1618, #1697 and #1731). Also re-worked variable names to be more consistent with the core.

src/core.js

@@ -1251,17 +1251,20 @@ jQuery.each({
 
 	remove: function( selector ) {
 		if ( !selector || jQuery.filter( selector, [ this ] ).r.length ) {
-			jQuery.removeData( this );
+			// Prevent memory leaks
+			jQuery( "*", this ).add(this).each(function(){
+				jQuery.event.remove(this);
+				jQuery.removeData(this);
+			});
 			this.parentNode.removeChild( this );
 		}
 	},
 
 	empty: function() {
-		// Clean up the cache
-		jQuery( "*", this ).each(function(){
-			jQuery.removeData(this);
-		});
-
+		// Remove element nodes and prevent memory leaks
+		jQuery( ">*", this ).remove();
+		
+		// Remove any remaining nodes
 		while ( this.firstChild )
 			this.removeChild( this.firstChild );
 	}

src/event.js

@@ -43,7 +43,7 @@ jQuery.event = {
 		// Init the element's event structure
 		var events = jQuery.data(element, "events") || jQuery.data(element, "events", {});
 		
-		var handle = jQuery.data(element, "handle", function(){
+		var handle = jQuery.data(element, "handle") || jQuery.data(element, "handle", function(){
 			// returned undefined or false
 			var val;
 
@@ -149,10 +149,10 @@ jQuery.event = {
 		} else {
 			var val, ret, fn = jQuery.isFunction( element[ type ] || null ),
 				// Check to see if we need to provide a fake event, or not
-				evt = !data[0] || !data[0].preventDefault;
+				event = !data[0] || !data[0].preventDefault;
 			
 			// Pass along a fake event
-			if ( evt )
+			if ( event )
 				data.unshift( this.fix({ type: type, target: element }) );
 
 			// Enforce the right trigger type
@@ -167,7 +167,7 @@ jQuery.event = {
 				val = false;
 
 			// Extra functions don't get the custom event object
-			if ( evt )
+			if ( event )
 				data.shift();
 
 			// Handle triggering of extra function
@@ -197,23 +197,24 @@ jQuery.event = {
 		var parts = event.type.split(".");
 		event.type = parts[0];
 
-		var c = jQuery.data(this, "events") && jQuery.data(this, "events")[event.type], args = Array.prototype.slice.call( arguments, 1 );
+		var handlers = jQuery.data(this, "events") && jQuery.data(this, "events")[event.type], args = Array.prototype.slice.call( arguments, 1 );
 		args.unshift( event );
 
-		for ( var j in c ) {
+		for ( var j in handlers ) {
+			var handler = handlers[j];
 			// Pass in a reference to the handler function itself
 			// So that we can later remove it
-			args[0].handler = c[j];
-			args[0].data = c[j].data;
+			args[0].handler = handler;
+			args[0].data = handler.data;
 
 			// Filter the functions by class
-			if ( !parts[1] || c[j].type == parts[1] ) {
-				var tmp = c[j].apply( this, args );
+			if ( !parts[1] || handler.type == parts[1] ) {
+				var ret = handler.apply( this, args );
 
 				if ( val !== false )
-					val = tmp;
+					val = ret;
 
-				if ( tmp === false ) {
+				if ( ret === false ) {
 					event.preventDefault();
 					event.stopPropagation();
 				}
@@ -265,9 +266,9 @@ jQuery.event = {
 
 		// Calculate pageX/Y if missing and clientX/Y available
 		if ( event.pageX == null && event.clientX != null ) {
-			var e = document.documentElement, b = document.body;
-			event.pageX = event.clientX + (e && e.scrollLeft || b && b.scrollLeft || 0);
-			event.pageY = event.clientY + (e && e.scrollTop || b && b.scrollTop || 0);
+			var doc = document.documentElement, body = document.body;
+			event.pageX = event.clientX + (doc && doc.scrollLeft || body && body.scrollLeft || 0);
+			event.pageY = event.clientY + (doc && doc.scrollTop || body && body.scrollTop || 0);
 		}
 			
 		// Add which for key events
@@ -322,54 +323,54 @@ jQuery.fn.extend({
 
 	toggle: function() {
 		// Save reference to arguments for access in closure
-		var a = arguments;
+		var args = arguments;
 
-		return this.click(function(e) {
+		return this.click(function(event) {
 			// Figure out which function to execute
 			this.lastToggle = 0 == this.lastToggle ? 1 : 0;
 			
 			// Make sure that clicks stop
-			e.preventDefault();
+			event.preventDefault();
 			
 			// and execute the function
-			return a[this.lastToggle].apply( this, [e] ) || false;
+			return args[this.lastToggle].apply( this, [event] ) || false;
 		});
 	},
 
-	hover: function(f,g) {
+	hover: function(fnOver, fnOut) {
 		
 		// A private function for handling mouse 'hovering'
-		function handleHover(e) {
+		function handleHover(event) {
 			// Check if mouse(over|out) are still within the same parent element
-			var p = e.relatedTarget;
+			var parent = event.relatedTarget;
 	
 			// Traverse up the tree
-			while ( p && p != this ) try { p = p.parentNode; } catch(e) { p = this; };
+			while ( parent && parent != this ) try { parent = parent.parentNode; } catch(error) { parent = this; };
 			
 			// If we actually just moused on to a sub-element, ignore it
-			if ( p == this ) return false;
+			if ( parent == this ) return false;
 			
 			// Execute the right function
-			return (e.type == "mouseover" ? f : g).apply(this, [e]);
+			return (event.type == "mouseover" ? fnOver : fnOut).apply(this, [event]);
 		}
 		
 		// Bind the function to the two event listeners
 		return this.mouseover(handleHover).mouseout(handleHover);
 	},
 	
-	ready: function(f) {
+	ready: function(fn) {
 		// Attach the listeners
 		bindReady();
 
 		// If the DOM is already ready
 		if ( jQuery.isReady )
 			// Execute the function immediately
-			f.apply( document, [jQuery] );
+			fn.apply( document, [jQuery] );
 			
 		// Otherwise, remember the function for later
 		else
 			// Add the function to the wait list
-			jQuery.readyList.push( function() { return f.apply(this, [jQuery]); } );
+			jQuery.readyList.push( function() { return fn.apply(this, [jQuery]); } );
 	
 		return this;
 	}
@@ -409,11 +410,11 @@ jQuery.extend({
 
 jQuery.each( ("blur,focus,load,resize,scroll,unload,click,dblclick," +
 	"mousedown,mouseup,mousemove,mouseover,mouseout,change,select," + 
-	"submit,keydown,keypress,keyup,error").split(","), function(i,o){
+	"submit,keydown,keypress,keyup,error").split(","), function(i, name){
 	
 	// Handle event binding
-	jQuery.fn[o] = function(f){
-		return f ? this.bind(o, f) : this.trigger(o);
+	jQuery.fn[name] = function(fn){
+		return fn ? this.bind(name, fn) : this.trigger(name);
 	};
 });
 
@@ -451,3 +452,9 @@ function bindReady(){
 	// A fallback to window.onload, that will always work
 	jQuery.event.add( window, "load", jQuery.ready );
 }
+
+// Prevent memory leaks in IE
+if ( jQuery.browser.msie )
+	jQuery(window).bind("unload", function() {
+		$("*").add([document, window]).unbind();
+	});