Using data() on JavaScript objects sets fields directly on the object. Note that events are now a property of a function (to avoid JSON serialization - and only in the case of JavaScript objects, not DOM nodes). Fixes #6807.

src/data.js

@@ -30,18 +30,17 @@ jQuery.extend({
 			windowData :
 			elem;
 
-		var id = elem[ jQuery.expando ], cache = jQuery.cache, thisCache,
+		var isNode = elem.nodeType,
-			isNode = elem.nodeType,
+			id = isNode ? elem[ jQuery.expando ] : null,
-			store;
+			cache = jQuery.cache, thisCache;
 
-		if ( !id && typeof name === "string" && data === undefined ) {
+		if ( isNode && !id && typeof name === "string" && data === undefined ) {
 			return;
 		}
 
 		// Get the data from the object directly
 		if ( !isNode ) {
 			cache = elem;
-			id = jQuery.expando;
 
 		// Compute a unique ID for the element
 		} else if ( !id ) {
@@ -55,26 +54,14 @@ jQuery.extend({
 				cache[ id ] = jQuery.extend(cache[ id ], name);
 
 			} else {
-				store = jQuery.extend(cache[ id ], name);
+				jQuery.extend( cache, name );
-				cache[ id ] = function() {
-					return store;
-				};
 			}
 
-		} else if ( !cache[ id ] ) {
+		} else if ( isNode && !cache[ id ] ) {
-			if ( isNode ) {
 			cache[ id ] = {};
-
-			} else {
-				store = {};
-				cache[ id ] = function() {
-					return store;
-				};
 		}
 
-		}
+		thisCache = isNode ? cache[ id ] : cache;
-
-		thisCache = isNode ? cache[ id ] : cache[ id ]();
 
 		// Prevent overriding the named cache with undefined values
 		if ( data !== undefined ) {
@@ -94,11 +81,9 @@ jQuery.extend({
 			elem;
 
 		var isNode = elem.nodeType,
-			id = elem[ jQuery.expando ], cache = jQuery.cache;
+			id = isNode ? elem[ jQuery.expando ] : elem,
-		if ( id && !isNode ) {
+			cache = jQuery.cache,
-			id = id();
+			thisCache = isNode ? cache[ id ] : id;
-		}
-		var thisCache = cache[ id ];
 
 		// If we want to remove a specific section of the element's data
 		if ( name ) {
@@ -107,23 +92,28 @@ jQuery.extend({
 				delete thisCache[ name ];
 
 				// If we've removed all the data, remove the element's cache
-				if ( jQuery.isEmptyObject(thisCache) ) {
+				if ( isNode && jQuery.isEmptyObject(thisCache) ) {
 					jQuery.removeData( elem );
 				}
 			}
 
 		// Otherwise, we want to remove all of the element's data
 		} else {
-			if ( jQuery.support.deleteExpando || !isNode ) {
+			if ( isNode && jQuery.support.deleteExpando ) {
 				delete elem[ jQuery.expando ];
 
 			} else if ( elem.removeAttribute ) {
 				elem.removeAttribute( jQuery.expando );
-			}
 
 			// Completely remove the data cache
-			if ( isNode ) {
+			} else if ( isNode ) {
 				delete cache[ id ];
+
+			// Remove all fields from the object
+			} else {
+				for ( var n in elem ) {
+					delete elem[ n ];
+				}
 			}
 		}
 	},

src/event.js

@@ -54,9 +54,26 @@ jQuery.event = {
 			return;
 		}
 
-		var events = elemData.events = elemData.events || {},
+		var events = elemData.events,
 			eventHandle = elemData.handle;
 			
+		if ( typeof events === "function" ) {
+			// On plain objects events is a fn that holds the the data
+			// which prevents this data from being JSON serialized
+			// the function does not need to be called, it just contains the data
+			eventHandle = events.handle;
+			events = events.events;
+
+		} else if ( !events ) {
+			if ( !elem.nodeType ) {
+				// On plain objects, create a fn that acts as the holder
+				// of the values to avoid JSON serialization of event data
+				elemData.events = elemData = function(){};
+			}
+
+			elemData.events = events = {};
+		}
+
 		if ( !eventHandle ) {
 			elemData.handle = eventHandle = function() {
 				// Handle the second event of a trigger and when
@@ -160,6 +177,11 @@ jQuery.event = {
 			return;
 		}
 		
+		if ( typeof events === "function" ) {
+			elemData = events;
+			events = events.events;
+		}
+
 		// types is actually an event object here
 		if ( types && types.type ) {
 			handler = types.handler;
@@ -259,7 +281,10 @@ jQuery.event = {
 			delete elemData.events;
 			delete elemData.handle;
 
-			if ( jQuery.isEmptyObject( elemData ) ) {
+			if ( typeof elemData === "function" ) {
+				delete elem.events;
+
+			} else if ( jQuery.isEmptyObject( elemData ) ) {
 				jQuery.removeData( elem );
 			}
 		}
@@ -319,7 +344,10 @@ jQuery.event = {
 		event.currentTarget = elem;
 
 		// Trigger the event, it is assumed that "handle" is a function
-		var handle = jQuery.data( elem, "handle" );
+		var handle = elem.nodeType ?
+			jQuery.data( elem, "handle" ) :
+			elem.events && elem.events.handle;
+
 		if ( handle ) {
 			handle.apply( elem, data );
 		}
@@ -393,6 +421,11 @@ jQuery.event = {
 		event.namespace = event.namespace || namespace_sort.join(".");
 
 		events = jQuery.data(this, "events");
+
+		if ( typeof events === "function" ) {
+			events = events.events;
+		}
+
 		handlers = (events || {})[ event.type ];
 
 		if ( events && handlers ) {
@@ -1007,6 +1040,10 @@ function liveHandler( event ) {
 		related, match, handleObj, elem, j, i, l, data, close, namespace, ret,
 		events = jQuery.data( this, "events" );
 
+	if ( typeof events === "function" ) {
+		events = events.events;
+	}
+
 	// Make sure we avoid non-left-click bubbling in Firefox (#3861)
 	if ( event.liveFired === this || !events || !events.live || event.button && event.type === "click" ) {
 		return;

test/unit/data.js

@@ -1,27 +1,22 @@
 module("data");
 
 test("expando", function(){
-	expect(7);
+	expect(6);
 
 	equals("expando" in jQuery, true, "jQuery is exposing the expando");
 
 	var obj = {};
-	jQuery.data(obj);
+	equals( jQuery.data(obj), obj, "jQuery.data(obj) returns the object");
-	equals( jQuery.expando in obj, true, "jQuery.data adds an expando to the object" );
+	equals( jQuery.expando in obj, false, "jQuery.data(obj) did not add an expando to the object" );
-	equals( typeof obj[jQuery.expando], "function", "jQuery.data adds an expando to the object as a function" );
 
 	obj = {};
 	jQuery.data(obj, 'test');
-	equals( jQuery.expando in obj, false, "jQuery.data did not add an expando to the object" );
+	equals( jQuery.expando in obj, false, "jQuery.data(obj,key) did not add an expando to the object" );
 
 	obj = {};
 	jQuery.data(obj, "foo", "bar");
-	equals( jQuery.expando in obj, true, "jQuery.data added an expando to the object" );
+	equals( jQuery.expando in obj, false, "jQuery.data(obj,key,value) did not add an expando to the object" );
-
+	equals( obj.foo, "bar", "jQuery.data(obj,key,value) sets fields directly on the object." );
-	var id = obj[jQuery.expando]();
-	equals( id in jQuery.cache, false, "jQuery.data did not add an entry to jQuery.cache" );
-
-	equals( id.foo, "bar", "jQuery.data worked correctly" );
 });
 
 test("jQuery.acceptData", function() {
@@ -43,7 +38,7 @@ test("jQuery.acceptData", function() {
 });
 
 test("jQuery.data", function() {
-	expect(13);
+	expect(12);
 	var div = document.createElement("div");
 
 	ok( jQuery.data(div, "test") === undefined, "Check for no data exists" );
@@ -67,17 +62,15 @@ test("jQuery.data", function() {
 
 	jQuery.data(div, "test3", "orig");
 	jQuery.data(div, { "test": "in", "test2": "in2" });
-	equals( jQuery.data(div, "test"), "in", "Verify setting an object in data." );
+	equals( jQuery.data(div, "test"), "in", "Verify setting an object in data" );
-	equals( jQuery.data(div, "test2"), "in2", "Verify setting an object in data." );
+	equals( jQuery.data(div, "test2"), "in2", "Verify setting an object in data" );
-	equals( jQuery.data(div, "test3"), "orig", "Verify original not overwritten." );
+	equals( jQuery.data(div, "test3"), "orig", "Verify original not overwritten" );
 
 	var obj = {};
 	jQuery.data( obj, "prop", true );
 
-	ok( obj[ jQuery.expando ], "Data is being stored on the object." );
+	ok( obj.prop, "Data is being stored on the object" );
-	ok( obj[ jQuery.expando ]().prop, "Data is being stored on the object." );
+	equals( jQuery.data( obj, "prop" ), true, "Make sure the right value is retrieved" );
-
-	equals( jQuery.data( obj, "prop" ), true, "Make sure the right value is retrieved." );
 });
 
 test(".data()", function() {
@@ -95,7 +88,7 @@ test(".data()", function() {
 })
 
 test(".data(String) and .data(String, Object)", function() {
-	expect(27);
+	expect(29);
 	var parent = jQuery("<div><div></div></div>"),
 		div = parent.children();
 
@@ -173,14 +166,16 @@ test(".data(String) and .data(String, Object)", function() {
 	equals( div.data("test.bar"), "testroot", "Check for unmatched namespace" );
 
 	// #3748
-	var $elem = jQuery({});
+	var $elem = jQuery({exists:true});
 	equals( $elem.data('nothing'), undefined, "Non-existent data returns undefined");
 	equals( $elem.data('null',null).data('null'), null, "null's are preserved");
 	equals( $elem.data('emptyString','').data('emptyString'), '', "Empty strings are preserved");
 	equals( $elem.data('false',false).data('false'), false, "false's are preserved");
+	equals( $elem.data('exists'), true, "Existing data is returned" );
 	
 	// Clean up
 	$elem.removeData();
+	ok( jQuery.isEmptyObject( $elem[0] ), "removeData clears the object" );
 });
 
 test("data-* attributes", function() {
@@ -268,21 +263,34 @@ test("data-* attributes", function() {
 });
 
 test(".data(Object)", function() {
-	expect(2);
+	expect(4);
 
 	var div = jQuery("<div/>");
 
 	div.data({ "test": "in", "test2": "in2" });
-	equals( div.data("test"), "in", "Verify setting an object in data." );
+	equals( div.data("test"), "in", "Verify setting an object in data" );
-	equals( div.data("test2"), "in2", "Verify setting an object in data." );
+	equals( div.data("test2"), "in2", "Verify setting an object in data" );
+	
+	var obj = {test:"unset"},
+		jqobj = jQuery(obj);
+	jqobj.data({ "test": "in", "test2": "in2" });
+	equals( obj.test, "in", "Verify setting an object on an object extends the object" );
+	equals( obj.test2, "in2", "Verify setting an object on an object extends the object" );	
 });
 
 test("jQuery.removeData", function() {
-	expect(1);
+	expect(4);
 	var div = jQuery("#foo")[0];
 	jQuery.data(div, "test", "testing");
 	jQuery.removeData(div, "test");
 	equals( jQuery.data(div, "test"), undefined, "Check removal of data" );
+	
+	var obj = {};
+	jQuery.data(obj, "test", "testing");
+	equals( obj.test, "testing", "verify data on plain object");
+	jQuery.removeData(obj, "test");
+	equals( jQuery.data(obj, "test"), undefined, "Check removal of data on plain object" );
+	equals( obj.test, undefined, "Check removal of data directly from plain object" );	
 });
 
 test(".removeData()", function() {

test/unit/event.js

@@ -443,7 +443,7 @@ test("bind(name, false), unbind(name, false)", function() {
 });
 
 test("bind()/trigger()/unbind() on plain object", function() {
-	expect( 2 );
+	expect( 5 );
 
 	var obj = {};
 
@@ -457,7 +457,11 @@ test("bind()/trigger()/unbind() on plain object", function() {
 		ok( true, "Custom event run." );
 	});
 
-	ok( jQuery(obj).data("events"), "Object has events bound." );
+	var events = jQuery(obj).data("events");
+	ok( events, "Object has events bound." );
+	equals( typeof events, "function", "'events' expando is a function on plain objects." );
+	equals( obj.test, undefined, "Make sure that test event is not on the plain object." );
+	equals( obj.handle, undefined, "Make sure that the event handler is not on the plain object." );
 
 	// Should trigger 1
 	jQuery(obj).trigger("test");