Issue #1431: writeAttribute('checked') fails to write the 'checked' attribute, writes an 'undefined' attribute instead

Author: sdumitriu

src/prototype/dom/dom.js

@@ -2353,7 +2353,7 @@
       name = table.names[attr] || attr;
       value = attributes[attr];
       if (table.values[attr])
-        name = table.values[attr](element, value);
+        name = table.values[attr](element, value) || name;
       if (value === false || value === null)
         element.removeAttribute(name);
       else if (value === true)

test/unit/dom_test.js

@@ -1090,18 +1090,36 @@ new Test.Unit.Runner({
 
   testElementWriteAttributeWithBooleans: function() {
     var input = $('write_attribute_input'),
-      select = $('write_attribute_select'),
-      checkbox = $('write_attribute_checkbox'),
-      checkedCheckbox = $('write_attribute_checked_checkbox');
+      select = $('write_attribute_select');
     this.assert( input.          writeAttribute('readonly').            hasAttribute('readonly'));
     this.assert(!input.          writeAttribute('readonly', false).     hasAttribute('readonly'));
     this.assert( input.          writeAttribute('readonly', true).      hasAttribute('readonly'));
     this.assert(!input.          writeAttribute('readonly', null).      hasAttribute('readonly'));
     this.assert( input.          writeAttribute('readonly', 'readonly').hasAttribute('readonly'));
     this.assert( select.         writeAttribute('multiple').            hasAttribute('multiple'));
     this.assert( input.          writeAttribute('disabled').            hasAttribute('disabled'));
+  },
+  testElementWriteAttributeForCheckbox: function() {
+    var checkbox = $('write_attribute_checkbox'),
+      checkedCheckbox = $('write_attribute_checked_checkbox');
     this.assert( checkbox.       writeAttribute('checked').             checked);
+    this.assert( checkbox.       writeAttribute('checked').             hasAttribute('checked'));
+    this.assertEqual('checked', checkbox.writeAttribute('checked').getAttribute('checked'));
+    this.assert(!checkbox.       writeAttribute('checked').             hasAttribute('undefined'));
+    this.assert( checkbox.       writeAttribute('checked', true).       checked);
+    this.assert( checkbox.       writeAttribute('checked', true).       hasAttribute('checked'));
+    this.assert( checkbox.       writeAttribute('checked', 'checked').  checked);
+    this.assert( checkbox.       writeAttribute('checked', 'checked').  hasAttribute('checked'));
+    this.assert(!checkbox.       writeAttribute('checked', null).       checked);
+    this.assert(!checkbox.       writeAttribute('checked', null).       hasAttribute('checked'));
+    this.assert(!checkbox.       writeAttribute('checked', true).       hasAttribute('undefined'));
     this.assert(!checkedCheckbox.writeAttribute('checked', false).      checked);
+    this.assert(!checkbox.       writeAttribute('checked', false).      hasAttribute('checked'));
+  },
+  testElementWriteAttributeForStyle: function() {
+    var element = Element.extend(document.body.appendChild(document.createElement('p')));
+    this.assert( element.        writeAttribute('style', 'color: red'). hasAttribute('style'));
+    this.assert(!element.        writeAttribute('style', 'color: red'). hasAttribute('undefined'));
   },
 
   testElementWriteAttributeWithIssues: function() {