Partially revert commit a64dc0405064d68c7b7cd0f0fc8ea60086cbcd21.

Removing the conditional was too liberal as now attr() would even work
on plain javascript objects. Keeping a check to make sure it is at least
a DOM Node is appropriate. Using nodeName as in the commit which introduced
the nodeType === 1 check seems plausible.

diff --git a/src/attributes.js b/src/attributes.js
index 4824c29..c055fce 100644 (file)
--- a/src/attributes.js
+++ b/src/attributes.js
@@ -205,7 +205,6 @@ jQuery.fn.extend({
                                if ( rradiocheck.test( elem.type ) && !jQuery.support.checkOn ) {
                                        return elem.getAttribute("value") === null ? "on" : elem.value;
                                }
-                               
 
                                // Everything else, we just grab the value
                                return (elem.value || "").replace(rreturn, "");
@@ -271,7 +270,7 @@ jQuery.extend({
                height: true,
                offset: true
        },
-               
+
        attr: function( elem, name, value, pass ) {
                // don't set attributes on text and comment nodes
                if ( !elem || elem.nodeType === 3 || elem.nodeType === 8 ) {
@@ -289,88 +288,91 @@ jQuery.extend({
                // Try to normalize/fix the name
                name = notxml && jQuery.props[ name ] || name;
 
-               // These attributes require special treatment
-               var special = rspecialurl.test( name );
+               // Only do all the following if this is a node (faster for style)
+               if ( elem.nodeName ) {
+                       // 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" );
+                                       }
 
-               // 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;
+                                       if ( value === null ) {
+                                               if ( elem.nodeType === 1 ) {
+                                                       elem.removeAttribute( name );
+                                               }
 
-                               // Make sure that it also works with optgroups, see #5701
-                               if ( parent.parentNode ) {
-                                       parent.parentNode.selectedIndex;
+                                       } else {
+                                               elem[ name ] = value;
+                                       }
                                }
-                       }
-               }
 
-               // 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" );
+                               // 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 ( value === null ) {
-                                       if ( elem.nodeType === 1 ) {
-                                               elem.removeAttribute( name );
-                                       }
+                               // 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" );
 
-                               } else {
-                                       elem[ name ] = value;
+                                       return attributeNode && attributeNode.specified ?
+                                               attributeNode.value :
+                                               rfocusable.test( elem.nodeName ) || rclickable.test( elem.nodeName ) && elem.href ?
+                                                       0 :
+                                                       undefined;
                                }
-                       }
 
-                       // 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;
+                               return elem[ name ];
                        }
 
-                       // 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 ( !jQuery.support.style && notxml && name === "style" ) {
+                               if ( set ) {
+                                       elem.style.cssText = "" + value;
+                               }
 
-                               return attributeNode && attributeNode.specified ?
-                                       attributeNode.value :
-                                       rfocusable.test( elem.nodeName ) || rclickable.test( elem.nodeName ) && elem.href ?
-                                               0 :
-                                               undefined;
+                               return elem.style.cssText;
                        }
 
-                       return elem[ name ];
-               }
-
-               if ( !jQuery.support.style && notxml && name === "style" ) {
                        if ( set ) {
-                               elem.style.cssText = "" + value;
+                               // convert the value to a string (all browsers do this but IE) see #1070
+                               elem.setAttribute( name, "" + value );
                        }
 
-                       return elem.style.cssText;
-               }
+                       // Ensure that missing attributes return undefined
+                       // Blackberry 4.7 returns "" from getAttribute #6938
+                       if ( !elem.attributes[ name ] && (elem.hasAttribute && !elem.hasAttribute( name )) ) {
+                               return undefined;
+                       }
 
-               if ( set ) {
-                       // convert the value to a string (all browsers do this but IE) see #1070
-                       elem.setAttribute( name, "" + value );
-               }
+                       var attr = !jQuery.support.hrefNormalized && notxml && special ?
+                                       // Some attributes require a special call on IE
+                                       elem.getAttribute( name, 2 ) :
+                                       elem.getAttribute( name );
 
-               // Ensure that missing attributes return undefined
-               // Blackberry 4.7 returns "" from getAttribute #6938
-               if ( !elem.attributes[ name ] && (elem.hasAttribute && !elem.hasAttribute( name )) ) {
-                       return undefined;
+                       // Non-existent attributes return null, we normalize to undefined
+                       return attr === null ? undefined : attr;
                }
-
-               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;
        }
 });