Attach data directly to plain objects, no reason to use the central jQuery.cache. Fixes #6189.

src/data.js

@@ -3,7 +3,7 @@ var expando = "jQuery" + now(), uuid = 0, windowData = {};
 jQuery.extend({
 	cache: {},
 	
-	expando:expando,
+	expando: expando,
 
 	// The following elements throw uncatchable exceptions if you
 	// attempt to add expando properties to them.
@@ -22,25 +22,29 @@ jQuery.extend({
 			windowData :
 			elem;
 
-		var id = elem[ expando ], cache = jQuery.cache, thisCache;
+		var id = elem[ jQuery.expando ], cache = jQuery.cache, thisCache,
+			isNode = elem.nodeType;
 
 		if ( !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
-		if ( !id ) { 
-			id = ++uuid;
+		} else if ( !id ) {
+			elem[ jQuery.expando ] = id = ++uuid;
 		}
 
 		// Avoid generating a new cache unless none exists and we
 		// want to manipulate it.
 		if ( typeof name === "object" ) {
-			elem[ expando ] = id;
-			thisCache = cache[ id ] = jQuery.extend(true, {}, name);
+			cache[ id ] = jQuery.extend(true, {}, name);
 
 		} else if ( !cache[ id ] ) {
-			elem[ expando ] = id;
 			cache[ id ] = {};
 		}
 
@@ -63,7 +67,8 @@ jQuery.extend({
 			windowData :
 			elem;
 
-		var id = elem[ expando ], cache = jQuery.cache, thisCache = cache[ id ];
+		var id = elem[ jQuery.expando ], cache = jQuery.cache,
+			isNode = elem.nodeType, thisCache = isNode ? cache[ id ] : id;
 
 		// If we want to remove a specific section of the element's data
 		if ( name ) {
@@ -79,7 +84,7 @@ jQuery.extend({
 
 		// Otherwise, we want to remove all of the element's data
 		} else {
-			if ( jQuery.support.deleteExpando ) {
+			if ( jQuery.support.deleteExpando || !isNode ) {
 				delete elem[ jQuery.expando ];
 
 			} else if ( elem.removeAttribute ) {
@@ -87,7 +92,9 @@ jQuery.extend({
 			}
 
 			// Completely remove the data cache
-			delete cache[ id ];
+			if ( isNode ) {
+				delete cache[ id ];
+			}
 		}
 	}
 });

test/unit/data.js

@@ -18,13 +18,13 @@ test("expando", function(){
 	equals( jQuery.expando in obj, true, "jQuery.data added an expando to the object" );
 	
 	var id = obj[jQuery.expando];
-	equals( id in jQuery.cache, true, "jQuery.data added an entry to jQuery.cache" );
+	equals( id in jQuery.cache, false, "jQuery.data did not add an entry to jQuery.cache" );
 	
-	equals( jQuery.cache[id].foo, "bar", "jQuery.data worked correctly" );
+	equals( id.foo, "bar", "jQuery.data worked correctly" );
 });
 
 test("jQuery.data", function() {
-	expect(9);
+	expect(12);
 	var div = document.createElement("div");
 
 	ok( jQuery.data(div, "test") === undefined, "Check for no data exists" );
@@ -49,6 +49,14 @@ test("jQuery.data", function() {
 	jQuery.data(div, { "test": "in", "test2": "in2" });
 	equals( jQuery.data(div, "test"), "in", "Verify setting an object in data." );
 	equals( jQuery.data(div, "test2"), "in2", "Verify setting an object in data." );
+
+	var obj = {};
+	jQuery.data( obj, "prop", true );
+
+	ok( obj[ jQuery.expando ], "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." );
 });
 
 test(".data()", function() {