Remove conditional that prevents attr from working on non-Element nodes. Fixes #7451.

src/attributes.js

@@ -289,91 +289,88 @@ jQuery.extend({
 		// Try to normalize/fix the name
 		name = notxml && jQuery.props[ name ] || name;
 
-		// Only do all the following if this is a node (faster for style)
-		if ( elem.nodeType === 1 ) {
-			// These attributes require special treatment
-			var special = rspecialurl.test( name );
-
-			// Safari mis-reports the default selected property of an option
-			// Accessing the parent's selectedIndex property fixes it
-			if ( name === "selected" && !jQuery.support.optSelected ) {
-				var parent = elem.parentNode;
-				if ( parent ) {
-					parent.selectedIndex;
-	
-					// Make sure that it also works with optgroups, see #5701
-					if ( parent.parentNode ) {
-						parent.parentNode.selectedIndex;
-					}
+		// These attributes require special treatment
+		var special = rspecialurl.test( name );
+
+		// Safari mis-reports the default selected property of an option
+		// Accessing the parent's selectedIndex property fixes it
+		if ( name === "selected" && !jQuery.support.optSelected ) {
+			var parent = elem.parentNode;
+			if ( parent ) {
+				parent.selectedIndex;
+
+				// Make sure that it also works with optgroups, see #5701
+				if ( parent.parentNode ) {
+					parent.parentNode.selectedIndex;
 				}
 			}
+		}
 
-			// If applicable, access the attribute via the DOM 0 way
-			// 'in' checks fail in Blackberry 4.7 #6931
-			if ( (name in elem || elem[ name ] !== undefined) && notxml && !special ) {
-				if ( set ) {
-					// We can't allow the type property to be changed (since it causes problems in IE)
-					if ( name === "type" && rtype.test( elem.nodeName ) && elem.parentNode ) {
-						jQuery.error( "type property can't be changed" );
-					}
-
-					if ( value === null ) {
-						if ( elem.nodeType === 1 ) {
-							elem.removeAttribute( name );
-						}
-
-					} else {
-						elem[ name ] = value;
-					}
-				}
-
-				// browsers index elements by id/name on forms, give priority to attributes.
-				if ( jQuery.nodeName( elem, "form" ) && elem.getAttributeNode(name) ) {
-					return elem.getAttributeNode( name ).nodeValue;
+		// If applicable, access the attribute via the DOM 0 way
+		// 'in' checks fail in Blackberry 4.7 #6931
+		if ( (name in elem || elem[ name ] !== undefined) && notxml && !special ) {
+			if ( set ) {
+				// We can't allow the type property to be changed (since it causes problems in IE)
+				if ( name === "type" && rtype.test( elem.nodeName ) && elem.parentNode ) {
+					jQuery.error( "type property can't be changed" );
 				}
 
-				// elem.tabIndex doesn't always return the correct value when it hasn't been explicitly set
-				// http://fluidproject.org/blog/2008/01/09/getting-setting-and-removing-tabindex-values-with-javascript/
-				if ( name === "tabIndex" ) {
-					var attributeNode = elem.getAttributeNode( "tabIndex" );
+				if ( value === null ) {
+					if ( elem.nodeType === 1 ) {
+						elem.removeAttribute( name );
+					}
 
-					return attributeNode && attributeNode.specified ?
-						attributeNode.value :
-						rfocusable.test( elem.nodeName ) || rclickable.test( elem.nodeName ) && elem.href ?
-							0 :
-							undefined;
+				} else {
+					elem[ name ] = value;
 				}
+			}
 
-				return elem[ name ];
+			// browsers index elements by id/name on forms, give priority to attributes.
+			if ( jQuery.nodeName( elem, "form" ) && elem.getAttributeNode(name) ) {
+				return elem.getAttributeNode( name ).nodeValue;
 			}
 
-			if ( !jQuery.support.style && notxml && name === "style" ) {
-				if ( set ) {
-					elem.style.cssText = "" + value;
-				}
+			// elem.tabIndex doesn't always return the correct value when it hasn't been explicitly set
+			// http://fluidproject.org/blog/2008/01/09/getting-setting-and-removing-tabindex-values-with-javascript/
+			if ( name === "tabIndex" ) {
+				var attributeNode = elem.getAttributeNode( "tabIndex" );
 
-				return elem.style.cssText;
+				return attributeNode && attributeNode.specified ?
+					attributeNode.value :
+					rfocusable.test( elem.nodeName ) || rclickable.test( elem.nodeName ) && elem.href ?
+						0 :
+						undefined;
 			}
 
+			return elem[ name ];
+		}
+
+		if ( !jQuery.support.style && notxml && name === "style" ) {
 			if ( set ) {
-				// convert the value to a string (all browsers do this but IE) see #1070
-				elem.setAttribute( name, "" + value );
+				elem.style.cssText = "" + value;
 			}
 
-			// Ensure that missing attributes return undefined
-			// Blackberry 4.7 returns "" from getAttribute #6938
-			if ( !elem.attributes[ name ] && (elem.hasAttribute && !elem.hasAttribute( name )) ) {
-				return undefined;
-			}
+			return elem.style.cssText;
+		}
 
-			var attr = !jQuery.support.hrefNormalized && notxml && special ?
-					// Some attributes require a special call on IE
-					elem.getAttribute( name, 2 ) :
-					elem.getAttribute( name );
+		if ( set ) {
+			// convert the value to a string (all browsers do this but IE) see #1070
+			elem.setAttribute( name, "" + value );
+		}
 
-			// Non-existent attributes return null, we normalize to undefined
-			return attr === null ? undefined : attr;
+		// Ensure that missing attributes return undefined
+		// Blackberry 4.7 returns "" from getAttribute #6938
+		if ( !elem.attributes[ name ] && (elem.hasAttribute && !elem.hasAttribute( name )) ) {
+			return undefined;
 		}
+
+		var attr = !jQuery.support.hrefNormalized && notxml && special ?
+				// Some attributes require a special call on IE
+				elem.getAttribute( name, 2 ) :
+				elem.getAttribute( name );
+
+		// Non-existent attributes return null, we normalize to undefined
+		return attr === null ? undefined : attr;
 	}
 });
 

test/unit/attributes.js

@@ -4,7 +4,7 @@ var bareObj = function(value) { return value; };
 var functionReturningObj = function(value) { return (function() { return value; }); };
 
 test("attr(String)", function() {
-	expect(30);
+	expect(31);
 
 	// This one sometimes fails randomly ?!
 	equals( jQuery('#text1').attr('value'), "Test", 'Check for value attribute' );
@@ -65,6 +65,8 @@ test("attr(String)", function() {
 
 	ok( jQuery("<div/>").attr("doesntexist") === undefined, "Make sure undefined is returned when no attribute is found." );
 	ok( jQuery().attr("doesntexist") === undefined, "Make sure undefined is returned when no element is there." );
+
+	equals( jQuery(document).attr("nodeName"), "#document", "attr works correctly on document nodes (bug #7451)." );
 });
 
 if ( !isLocal ) {