A follow-up to [6578] (which stopped adding expandos to elements that didn't have data). That broke jQuery.unique() (so we're now using the unique from Sizzle). Using Sizzle's unique (which also sorts in document order) changed how add, andSelf, parents, nextAll, prevAll, and siblings work. after and before were changed to not use .add() (in order to guarantee their position in the jQuery set). Also, jQuery.data(elem) was updated to return that element's data object (instead of its ID).

$("<div/>").after("<span/>")
=> [ div, span ]
(calling after on a disconnected DOM node adds the nodes to the end of the jQuery set)

$("<div/>").before("<span/>")
=> [ span, div ]
(calling before on a disconnected DOM node adds the nodes to the beginning of the jQuery set)

$("div").add("span")
=> [ div, span, span, div, span ]
(results now come out in document order)

$("div").find("code").andSelf();
=> [ div, code, code ]
(results now come out in document order)

Same goes for .parents(), .nextAll(), .prevAll(), and .siblings().

Exception: .parents() will still return the results in reverse document order.

jQuery.data(elem)
=> { object of data }
(no longer returns the unique ID assigned to the node)

Author: jeresig

src/core.js

@@ -462,25 +462,6 @@ jQuery.extend({
 		return first;
 	},
 
-	unique: function( array ) {
-		var ret = [], done = {}, id;
-
-		try {
-			for ( var i = 0, length = array.length; i < length; i++ ) {
-				id = jQuery.data( array[ i ] );
-
-				if ( !done[ id ] ) {
-					done[ id ] = true;
-					ret.push( array[ i ] );
-				}
-			}
-		} catch( e ) {
-			ret = array;
-		}
-
-		return ret;
-	},
-
 	grep: function( elems, callback, inv ) {
 		var ret = [];
 

src/data.js

@@ -14,8 +14,8 @@ jQuery.extend({
 		var id = elem[ expando ], cache = jQuery.cache, thisCache;
 
 		// Handle the case where there's no name immediately
-		if ( !name ) {
-			return id;
+		if ( !name && !id ) {
+			return null;
 		}
 
 		// Compute a unique ID for the element
@@ -39,7 +39,7 @@ jQuery.extend({
 			thisCache[ name ] = data;
 		}
 
-		return name === true ? thisCache : thisCache[ name ];
+		return name ? thisCache[ name ] : thisCache;
 	},
 
 	removeData: function( elem, name ) {
@@ -116,7 +116,9 @@ jQuery.extend({
 
 jQuery.fn.extend({
 	data: function( key, value ){
-		if(typeof key === "undefined" && this.length) return jQuery.data(this[0], true);
+		if ( typeof key === "undefined" && this.length ) {
+			return jQuery.data( this[0] );
+		}
 
 		var parts = key.split(".");
 		parts[1] = parts[1] ? "." + parts[1] : "";
@@ -165,4 +167,4 @@ jQuery.fn.extend({
 	clearQueue: function(type){
 		return this.queue( type || "fx", [] );
 	}
-});
+});

src/manipulation.js

@@ -111,12 +111,10 @@ jQuery.fn.extend({
 			return this.domManip(arguments, false, function(elem){
 				this.parentNode.insertBefore( elem, this );
 			});
-		} else {
-			var set = jQuery.isFunction(arguments[0]) ?
-				jQuery( arguments[0]() ) :
-				jQuery.apply(jQuery, arguments);
-
-			return this.pushStack( set.add( this ), "before", arguments );
+		} else if ( arguments.length ) {
+			var set = jQuery(arguments[0]);
+			set.push.apply( set, this.toArray() );
+			return this.pushStack( set, "before", arguments );
 		}
 	},
 
@@ -125,10 +123,10 @@ jQuery.fn.extend({
 			return this.domManip(arguments, false, function(elem){
 				this.parentNode.insertBefore( elem, this.nextSibling );
 			});
-		} else {
-			return jQuery.isFunction(arguments[0]) ?
-				this.add( arguments[0]() ) :
-				this.add.apply( this, arguments );
+		} else if ( arguments.length ) {
+			var set = this.pushStack( this, "after", arguments );
+			set.push.apply( set, jQuery(arguments[0]).toArray() );
+			return set;
 		}
 	},
 

src/selector.js

@@ -144,6 +144,8 @@ Sizzle.uniqueSort = function(results){
 			}
 		}
 	}
+
+	return results;
 };
 
 Sizzle.matches = function(expr, set){
@@ -703,6 +705,13 @@ var sortOrder;
 
 if ( document.documentElement.compareDocumentPosition ) {
 	sortOrder = function( a, b ) {
+		if ( !a.compareDocumentPosition || !b.compareDocumentPosition ) {
+			if ( a == b ) {
+				hasDuplicate = true;
+			}
+			return 0;
+		}
+
 		var ret = a.compareDocumentPosition(b) & 4 ? -1 : a === b ? 0 : 1;
 		if ( ret === 0 ) {
 			hasDuplicate = true;
@@ -711,6 +720,13 @@ if ( document.documentElement.compareDocumentPosition ) {
 	};
 } else if ( "sourceIndex" in document.documentElement ) {
 	sortOrder = function( a, b ) {
+		if ( !a.sourceIndex || !b.sourceIndex ) {
+			if ( a == b ) {
+				hasDuplicate = true;
+			}
+			return 0;
+		}
+
 		var ret = a.sourceIndex - b.sourceIndex;
 		if ( ret === 0 ) {
 			hasDuplicate = true;
@@ -719,6 +735,13 @@ if ( document.documentElement.compareDocumentPosition ) {
 	};
 } else if ( document.createRange ) {
 	sortOrder = function( a, b ) {
+		if ( !a.ownerDocument || !b.ownerDocument ) {
+			if ( a == b ) {
+				hasDuplicate = true;
+			}
+			return 0;
+		}
+
 		var aRange = a.ownerDocument.createRange(), bRange = b.ownerDocument.createRange();
 		aRange.selectNode(a);
 		aRange.collapse(true);
@@ -1036,6 +1059,8 @@ jQuery.sibling = function(n, elem){
 	return r;
 };
 
+jQuery.unique = Sizzle.uniqueSort;
+
 return;
 
 window.Sizzle = Sizzle;

src/traversing.js

@@ -69,12 +69,14 @@ jQuery.fn.extend({
 	},
 
 	add: function( selector ) {
-		return this.pushStack( jQuery.unique( jQuery.merge(
-			this.get(),
-			typeof selector === "string" ?
+		var set = typeof selector === "string" ?
 				jQuery( selector ) :
-				jQuery.makeArray( selector )
-		)));
+				jQuery.makeArray( selector ),
+			all = jQuery.merge( this.get(), set );
+
+		return this.pushStack( set[0] && (set[0].setInterval || set[0].nodeType === 9 || (set[0].parentNode && set[0].parentNode.nodeType !== 11)) ?
+			jQuery.unique( all ) :
+			all );
 	},
 
 	eq: function( i ) {
@@ -125,9 +127,16 @@ jQuery.each({
 	jQuery.fn[ name ] = function( selector ) {
 		var ret = jQuery.map( this, fn );
 
-		if ( selector && typeof selector == "string" )
+		if ( selector && typeof selector === "string" ) {
 			ret = jQuery.multiFilter( selector, ret );
+		}
+
+		ret = this.length > 1 ? jQuery.unique( ret ) : ret;
+
+		if ( name === "parents" && this.length > 1 ) {
+			ret = ret.reverse();
+		}
 
-		return this.pushStack( jQuery.unique( ret ), name, selector );
+		return this.pushStack( ret, name, selector );
 	};
 });

test/unit/core.js

@@ -399,7 +399,7 @@ test("get(-Number)",function() {
 })
 
 test("add(String|Element|Array|undefined)", function() {
-	expect(12);
+	expect(16);
 	isSet( jQuery("#sndp").add("#en").add("#sap").get(), q("sndp", "en", "sap"), "Check elements from document" );
 	isSet( jQuery("#sndp").add( jQuery("#en")[0] ).add( jQuery("#sap") ).get(), q("sndp", "en", "sap"), "Check elements from document" );
 	ok( jQuery([]).add(jQuery("#form")[0].elements).length >= 13, "Check elements from array" );
@@ -408,6 +408,16 @@ test("add(String|Element|Array|undefined)", function() {
 	// use jQuery([]).add(form.elements) instead.
 	//equals( jQuery([]).add(jQuery("#form")[0].elements).length, jQuery(jQuery("#form")[0].elements).length, "Array in constructor must equals array in add()" );
 
+	var tmp = jQuery("<div/>");
+
+	var x = jQuery([]).add(jQuery("<p id='x1'>xxx</p>").appendTo(tmp)).add(jQuery("<p id='x2'>xxx</p>").appendTo(tmp));
+	equals( x[0].id, "x1", "Check on-the-fly element1" );
+	equals( x[1].id, "x2", "Check on-the-fly element2" );
+
+	var x = jQuery([]).add(jQuery("<p id='x1'>xxx</p>").appendTo(tmp)[0]).add(jQuery("<p id='x2'>xxx</p>").appendTo(tmp)[0]);
+	equals( x[0].id, "x1", "Check on-the-fly element1" );
+	equals( x[1].id, "x2", "Check on-the-fly element2" );
+
 	var x = jQuery([]).add(jQuery("<p id='x1'>xxx</p>")).add(jQuery("<p id='x2'>xxx</p>"));
 	equals( x[0].id, "x1", "Check on-the-fly element1" );
 	equals( x[1].id, "x2", "Check on-the-fly element2" );

test/unit/data.js

@@ -32,7 +32,7 @@ test("jQuery.data", function() {
 	jQuery.data(div, "test", "success");
 	equals( jQuery.data(div, "test"), "success", "Check for added data" );
 
-	var data = jQuery.data(div, true);
+	var data = jQuery.data(div);
 	same( data, { "test": "success" }, "Return complete data set" );
 
 	jQuery.data(div, "test", "overwritten");

test/unit/manipulation.js

@@ -340,7 +340,7 @@ var testBefore = function(val) {
 	jQuery('#yahoo').before(val( jQuery("#first, #mark") ));
 	equals( expected, jQuery('#en').text(), "Insert jQuery before" );
 
-	var set = jQuery("<div/>").before(val("<span>test</span>"));
+	var set = jQuery("<div/>").before("<span>test</span>");
 	equals( set[0].nodeName.toLowerCase(), "span", "Insert the element before the disconnected node." );
 	equals( set.length, 2, "Insert the element before the disconnected node." );
 }
@@ -396,7 +396,7 @@ var testAfter = function(val) {
 	jQuery('#yahoo').after(val( jQuery("#first, #mark") ));
 	equals( expected, jQuery('#en').text(), "Insert jQuery after" );
 
-	var set = jQuery("<div/>").after(val("<span>test</span>"));
+	var set = jQuery("<div/>").after("<span>test</span>");
 	equals( set[1].nodeName.toLowerCase(), "span", "Insert the element after the disconnected node." );
 	equals( set.length, 2, "Insert the element after the disconnected node." );
 };

test/unit/traversing.js

@@ -145,8 +145,8 @@ test("not(jQuery)", function() {
 
 test("andSelf()", function() {
 	expect(4);
-	isSet( jQuery("#en").siblings().andSelf().get(), q("sndp", "sap","en"), "Check for siblings and self" );
-	isSet( jQuery("#foo").children().andSelf().get(), q("sndp", "en", "sap", "foo"), "Check for children and self" );
+	isSet( jQuery("#en").siblings().andSelf().get(), q("sndp", "en", "sap"), "Check for siblings and self" );
+	isSet( jQuery("#foo").children().andSelf().get(), q("foo", "sndp", "en", "sap"), "Check for children and self" );
 	isSet( jQuery("#sndp, #en").parent().andSelf().get(), q("foo","sndp","en"), "Check for parent and self" );
 	isSet( jQuery("#groups").parents("p, div").andSelf().get(), q("main", "ap", "groups"), "Check for parents and self" );
 });
@@ -157,7 +157,7 @@ test("siblings([String])", function() {
 	isSet( jQuery("#sndp").siblings(":has(code)").get(), q("sap"), "Check for filtered siblings (has code child element)" );
 	isSet( jQuery("#sndp").siblings(":has(a)").get(), q("en", "sap"), "Check for filtered siblings (has anchor child element)" );
 	isSet( jQuery("#foo").siblings("form, b").get(), q("form", "floatTest", "lengthtest", "name-tests", "testForm"), "Check for multiple filters" );
-	var set = q("en", "sap", "sndp");
+	var set = q("sndp", "en", "sap");
 	isSet( jQuery("#en, #sndp").siblings().get(), set, "Check for unique results from siblings" );
 });