Update $.data to use a function instead of an object when attaching to JS objects in order to hide attached metadata from JSON.stringify. Remove event.js code that was doing this before specifically for events, which is now redundant. Fixes #8108. 1.5-stable

src/data.js

@@ -63,12 +63,14 @@ jQuery.extend({
 		}
 
 		if ( !cache[ id ] ) {
-			cache[ id ] = {};
+			// Use a Function as the cache object instead of an Object on JS objects
+			// as a hack to prevent JSON.stringify from serializing it (#8108)
+			cache[ id ] = isNode ? {} : function () {};
 		}
 
 		// An object can be passed to jQuery.data instead of a key/value pair; this gets
 		// shallow copied over onto the existing cache
-		if ( typeof name === "object" ) {
+		if ( typeof name === "object" || typeof name === "function" ) {
 			if ( pvt ) {
 				cache[ id ][ internalKey ] = jQuery.extend(cache[ id ][ internalKey ], name);
 			} else {

src/event.js

@@ -7,8 +7,7 @@ var rnamespaces = /\.(.*)$/,
 	rescape = /[^\w\s.|`]/g,
 	fcleanup = function( nm ) {
 		return nm.replace(rescape, "\\$&");
-	},
-	eventKey = "events";
+	};
 
 /*
  * A number of helper functions used for managing events.
@@ -58,23 +57,10 @@ jQuery.event = {
 			return;
 		}
 
-		var events = elemData[ eventKey ],
+		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[ eventKey ] = elemData = function(){};
-			}
-
+		if ( !events ) {
 			elemData.events = events = {};
 		}
 
@@ -175,17 +161,12 @@ jQuery.event = {
 
 		var ret, type, fn, j, i = 0, all, namespaces, namespace, special, eventType, handleObj, origType,
 			elemData = jQuery.hasData( elem ) && jQuery._data( elem ),
-			events = elemData && elemData[ eventKey ];
+			events = elemData && elemData.events;
 
 		if ( !elemData || !events ) {
 			return;
 		}
 
-		if ( typeof events === "function" ) {
-			elemData = events;
-			events = events.events;
-		}
-
 		// types is actually an event object here
 		if ( types && types.type ) {
 			handler = types.handler;
@@ -285,10 +266,7 @@ jQuery.event = {
 			delete elemData.events;
 			delete elemData.handle;
 
-			if ( typeof elemData === "function" ) {
-				jQuery.removeData( elem, eventKey, true );
-
-			} else if ( jQuery.isEmptyObject( elemData ) ) {
+			if ( jQuery.isEmptyObject( elemData ) ) {
 				jQuery.removeData( elem, undefined, true );
 			}
 		}
@@ -329,7 +307,7 @@ jQuery.event = {
 						// points to jQuery.expando
 						var internalKey = jQuery.expando,
 							internalCache = this[ internalKey ];
-						if ( internalCache && internalCache.events && internalCache.events[type] ) {
+						if ( internalCache && internalCache.events && internalCache.events[ type ] ) {
 							jQuery.event.trigger( event, data, internalCache.handle.elem );
 						}
 					});
@@ -355,9 +333,7 @@ jQuery.event = {
 		event.currentTarget = elem;
 
 		// Trigger the event, it is assumed that "handle" is a function
-		var handle = elem.nodeType ?
-			jQuery._data( elem, "handle" ) :
-			(jQuery._data( elem, eventKey ) || {}).handle;
+		var handle = jQuery._data( elem, "handle" );
 
 		if ( handle ) {
 			handle.apply( elem, data );
@@ -435,11 +411,7 @@ jQuery.event = {
 
 		event.namespace = event.namespace || namespace_sort.join(".");
 
-		events = jQuery._data(this, eventKey);
-
-		if ( typeof events === "function" ) {
-			events = events.events;
-		}
+		events = jQuery._data(this, "events");
 
 		handlers = (events || {})[ event.type ];
 
@@ -1074,11 +1046,7 @@ function liveHandler( event ) {
 	var stop, maxLevel, related, match, handleObj, elem, j, i, l, data, close, namespace, ret,
 		elems = [],
 		selectors = [],
-		events = jQuery._data( this, eventKey );
-
-	if ( typeof events === "function" ) {
-		events = events.events;
-	}
+		events = jQuery._data( this, "events" );
 
 	// Make sure we avoid non-left-click bubbling in Firefox (#3861) and disabled elements in IE (#6911)
 	if ( event.liveFired === this || !events || !events.live || event.target.disabled || event.button && event.type === "click" ) {

test/unit/data.js

@@ -22,7 +22,7 @@ function dataTests (elem) {
 	strictEqual( jQuery.hasData(elem), false, "jQuery.hasData agrees no data exists initially" );
 
 	var dataObj = jQuery.data(elem);
-	equals( typeof dataObj, "object", "Calling data with no args gives us a data object reference" );
+	equals( typeof dataObj, elem.nodeType ? "object" : "function", "Calling data with no args gives us a data object reference" );
 	strictEqual( jQuery.data(elem), dataObj, "Calling jQuery.data returns the same data object when called multiple times" );
 
 	strictEqual( jQuery.hasData(elem), false, "jQuery.hasData agrees no data exists even when an empty data obj exists" );
@@ -187,8 +187,12 @@ test(".data()", function() {
 	equals( nodiv.data(), null, "data() on empty set returns null" );
 
 	var obj = { foo: "bar" };
-	deepEqual( jQuery(obj).data(), {}, "Retrieve data object from a wrapped JS object (#7524)" );
-})
+	jQuery(obj).data("foo", "baz");
+
+	var dataObj = jQuery.extend(true, {}, jQuery(obj).data());
+
+	deepEqual( dataObj, { foo: "baz" }, "Retrieve data object from a wrapped JS object (#7524)" );
+});
 
 test(".data(String) and .data(String, Object)", function() {
 	expect(29);
@@ -462,3 +466,14 @@ test(".removeData()", function() {
 	div.removeData("test.foo");
 	equals( div.data("test.foo"), undefined, "Make sure data is intact" );
 });
+
+if (window.JSON && window.JSON.stringify) {
+	test("JSON serialization (#8108)", function () {
+		expect(1);
+
+		var obj = { foo: "bar" };
+		jQuery.data(obj, "hidden", true);
+
+		equals( JSON.stringify(obj), '{"foo":"bar"}', "Expando is hidden from JSON.stringify" );
+	});
+}

test/unit/event.js

@@ -548,7 +548,7 @@ test("bind(name, false), unbind(name, false)", function() {
 });
 
 test("bind()/trigger()/unbind() on plain object", function() {
-	expect( 8 );
+	expect( 7 );
 
 	var obj = {};
 
@@ -570,7 +570,6 @@ test("bind()/trigger()/unbind() on plain object", function() {
 	var events = jQuery._data(obj, "events");
 	ok( events, "Object has events bound." );
 	equals( obj.events, undefined, "Events object on plain objects is not events" );
-	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." );