Fixed #11776 -- Added CSS class for non-field/top of form errors.

Thanks Daniel Pope for the suggestion.

10 files changed, 120 insertions, 17 deletions

diff --git a/AUTHORS b/AUTHORS
index 534e3e0f52..472d53c999 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -510,6 +510,7 @@ answer newbie questions, and generally made Django that much better:
     polpak@yahoo.com
     Ross Poulton <ross@rossp.org>
     Mihai Preda <mihai_preda@yahoo.com>
+    Nick Presta <nick@nickpresta.ca>
     Matthias Pronk <django@masida.nl>
     Jyrki Pulliainen <jyrki.pulliainen@gmail.com>
     Thejaswi Puthraya <thejaswi.puthraya@gmail.com>
diff --git a/django/forms/forms.py b/django/forms/forms.py
index b5cf17f4eb..347eccab4b 100644
--- a/django/forms/forms.py
+++ b/django/forms/forms.py
@@ -280,7 +280,7 @@ class BaseForm(object):
         field -- i.e., from Form.clean(). Returns an empty ErrorList if there
         are none.
         """
-        return self.errors.get(NON_FIELD_ERRORS, self.error_class())
+        return self.errors.get(NON_FIELD_ERRORS, self.error_class(error_class='nonfield'))
 
     def _raw_value(self, fieldname):
         """
@@ -331,7 +331,10 @@ class BaseForm(object):
                 if field != NON_FIELD_ERRORS and field not in self.fields:
                     raise ValueError(
                         "'%s' has no field named '%s'." % (self.__class__.__name__, field))
-                self._errors[field] = self.error_class()
+                if field == NON_FIELD_ERRORS:
+                    self._errors[field] = self.error_class(error_class='nonfield')
+                else:
+                    self._errors[field] = self.error_class()
             self._errors[field].extend(error_list)
             if field in self.cleaned_data:
                 del self.cleaned_data[field]
diff --git a/django/forms/utils.py b/django/forms/utils.py
index f7f53e9a0a..14253f36fe 100644
--- a/django/forms/utils.py
+++ b/django/forms/utils.py
@@ -80,6 +80,14 @@ class ErrorList(UserList, list):
     """
     A collection of errors that knows how to display itself in various formats.
     """
+    def __init__(self, initlist=None, error_class=None):
+        super(ErrorList, self).__init__(initlist)
+
+        if error_class is None:
+            self.error_class = 'errorlist'
+        else:
+            self.error_class = 'errorlist {}'.format(error_class)
+
     def as_data(self):
         return ValidationError(self.data).error_list
 
@@ -99,8 +107,10 @@ class ErrorList(UserList, list):
     def as_ul(self):
         if not self.data:
             return ''
+
         return format_html(
-            '<ul class="errorlist">{0}</ul>',
+            '<ul class="{0}">{1}</ul>',
+            self.error_class,
             format_html_join('', '<li>{0}</li>', ((force_text(e),) for e in self))
         )
 
diff --git a/docs/releases/1.8.txt b/docs/releases/1.8.txt
index 056ea86baf..f716c995ca 100644
--- a/docs/releases/1.8.txt
+++ b/docs/releases/1.8.txt
@@ -129,6 +129,10 @@ Forms
   the ``<label>`` tags for required fields will have this class present in its
   attributes.
 
+* The rendering of non-field errors in unordered lists (``<ul>``) now includes
+  ``nonfield`` in its list of classes to distinguish them from field-specific
+  errors.
+
 * :class:`~django.forms.Field` now accepts a
   :attr:`~django.forms.Field.label_suffix` argument, which will override the
   form's :attr:`~django.forms.Form.label_suffix`. This enables customizing the
diff --git a/docs/topics/forms/index.txt b/docs/topics/forms/index.txt
index f3afac5ab9..8db24f68d0 100644
--- a/docs/topics/forms/index.txt
+++ b/docs/topics/forms/index.txt
@@ -292,6 +292,17 @@ over them::
         </ol>
     {% endif %}
 
+.. versionchanged:: 1.8
+
+Non-field errors (and/or hidden field errors that are rendered at the top of
+the form when using helpers like ``form.as_p()``) will be rendered with an
+additional class of ``nonfield`` to help distinguish them from field-specific
+errors. For example, ``{{ form.non_field_errors }}`` would look like::
+
+    <ul class="errorlist nonfield">
+        <li>Generic validation error</li>
+    </ul>
+
 Looping over the form's fields
 ------------------------------
 
diff --git a/tests/admin_inlines/tests.py b/tests/admin_inlines/tests.py
index 5d97381f18..56f006c441 100644
--- a/tests/admin_inlines/tests.py
+++ b/tests/admin_inlines/tests.py
@@ -94,7 +94,7 @@ class TestInline(TestCase):
         }
         response = self.client.post('/admin/admin_inlines/titlecollection/add/', data)
         # Here colspan is "4": two fields (title1 and title2), one hidden field and the delete checkbox.
-        self.assertContains(response, '<tr><td colspan="4"><ul class="errorlist"><li>The two titles must be the same</li></ul></td></tr>')
+        self.assertContains(response, '<tr><td colspan="4"><ul class="errorlist nonfield"><li>The two titles must be the same</li></ul></td></tr>')
 
     def test_no_parent_callable_lookup(self):
         """Admin inline `readonly_field` shouldn't invoke parent ModelAdmin callable"""
diff --git a/tests/admin_views/tests.py b/tests/admin_views/tests.py
index ae6c66dc37..4b08956936 100644
--- a/tests/admin_views/tests.py
+++ b/tests/admin_views/tests.py
@@ -2035,7 +2035,7 @@ class AdminViewListEditable(TestCase):
             "_save": "Save",
         }
         response = self.client.post('/test_admin/admin/admin_views/fooddelivery/', data)
-        self.assertContains(response, '<tr><td colspan="4"><ul class="errorlist"><li>Food delivery with this Driver and Restaurant already exists.</li></ul></td></tr>', 1, html=True)
+        self.assertContains(response, '<tr><td colspan="4"><ul class="errorlist nonfield"><li>Food delivery with this Driver and Restaurant already exists.</li></ul></td></tr>', 1, html=True)
 
         data = {
             "form-TOTAL_FORMS": "3",
@@ -2062,7 +2062,7 @@ class AdminViewListEditable(TestCase):
             "_save": "Save",
         }
         response = self.client.post('/test_admin/admin/admin_views/fooddelivery/', data)
-        self.assertContains(response, '<tr><td colspan="4"><ul class="errorlist"><li>Food delivery with this Driver and Restaurant already exists.</li></ul></td></tr>', 2, html=True)
+        self.assertContains(response, '<tr><td colspan="4"><ul class="errorlist nonfield"><li>Food delivery with this Driver and Restaurant already exists.</li></ul></td></tr>', 2, html=True)
 
     def test_non_form_errors(self):
         # test if non-form errors are handled; ticket #12716
diff --git a/tests/forms_tests/tests/test_error_messages.py b/tests/forms_tests/tests/test_error_messages.py
index 0a2bc0a8bf..94f5424c4e 100644
--- a/tests/forms_tests/tests/test_error_messages.py
+++ b/tests/forms_tests/tests/test_error_messages.py
@@ -238,7 +238,7 @@ class FormsErrorMessagesTestCase(TestCase, AssertFormErrorsMixin):
         # This form should print errors the default way.
         form1 = TestForm({'first_name': 'John'})
         self.assertHTMLEqual(str(form1['last_name'].errors), '<ul class="errorlist"><li>This field is required.</li></ul>')
-        self.assertHTMLEqual(str(form1.errors['__all__']), '<ul class="errorlist"><li>I like to be awkward.</li></ul>')
+        self.assertHTMLEqual(str(form1.errors['__all__']), '<ul class="errorlist nonfield"><li>I like to be awkward.</li></ul>')
 
         # This one should wrap error groups in the customized way.
         form2 = TestForm({'first_name': 'John'}, error_class=CustomErrorList)
diff --git a/tests/forms_tests/tests/test_forms.py b/tests/forms_tests/tests/test_forms.py
index d6a0367975..985ff8e2e0 100644
--- a/tests/forms_tests/tests/test_forms.py
+++ b/tests/forms_tests/tests/test_forms.py
@@ -713,11 +713,11 @@ class FormsTestCase(TestCase):
 
         f = UserRegistration({'username': 'adrian', 'password1': 'foo', 'password2': 'bar'}, auto_id=False)
         self.assertEqual(f.errors['__all__'], ['Please make sure your passwords match.'])
-        self.assertHTMLEqual(f.as_table(), """<tr><td colspan="2"><ul class="errorlist"><li>Please make sure your passwords match.</li></ul></td></tr>
+        self.assertHTMLEqual(f.as_table(), """<tr><td colspan="2"><ul class="errorlist nonfield"><li>Please make sure your passwords match.</li></ul></td></tr>
 <tr><th>Username:</th><td><input type="text" name="username" value="adrian" maxlength="10" /></td></tr>
 <tr><th>Password1:</th><td><input type="password" name="password1" /></td></tr>
 <tr><th>Password2:</th><td><input type="password" name="password2" /></td></tr>""")
-        self.assertHTMLEqual(f.as_ul(), """<li><ul class="errorlist"><li>Please make sure your passwords match.</li></ul></li>
+        self.assertHTMLEqual(f.as_ul(), """<li><ul class="errorlist nonfield"><li>Please make sure your passwords match.</li></ul></li>
 <li>Username: <input type="text" name="username" value="adrian" maxlength="10" /></li>
 <li>Password1: <input type="password" name="password1" /></li>
 <li>Password2: <input type="password" name="password2" /></li>""")
@@ -947,15 +947,15 @@ class FormsTestCase(TestCase):
         # prepended. This message is displayed at the top of the output, regardless of
         # its field's order in the form.
         p = Person({'first_name': 'John', 'last_name': 'Lennon', 'birthday': '1940-10-9'}, auto_id=False)
-        self.assertHTMLEqual(p.as_table(), """<tr><td colspan="2"><ul class="errorlist"><li>(Hidden field hidden_text) This field is required.</li></ul></td></tr>
+        self.assertHTMLEqual(p.as_table(), """<tr><td colspan="2"><ul class="errorlist nonfield"><li>(Hidden field hidden_text) This field is required.</li></ul></td></tr>
 <tr><th>First name:</th><td><input type="text" name="first_name" value="John" /></td></tr>
 <tr><th>Last name:</th><td><input type="text" name="last_name" value="Lennon" /></td></tr>
 <tr><th>Birthday:</th><td><input type="text" name="birthday" value="1940-10-9" /><input type="hidden" name="hidden_text" /></td></tr>""")
-        self.assertHTMLEqual(p.as_ul(), """<li><ul class="errorlist"><li>(Hidden field hidden_text) This field is required.</li></ul></li>
+        self.assertHTMLEqual(p.as_ul(), """<li><ul class="errorlist nonfield"><li>(Hidden field hidden_text) This field is required.</li></ul></li>
 <li>First name: <input type="text" name="first_name" value="John" /></li>
 <li>Last name: <input type="text" name="last_name" value="Lennon" /></li>
 <li>Birthday: <input type="text" name="birthday" value="1940-10-9" /><input type="hidden" name="hidden_text" /></li>""")
-        self.assertHTMLEqual(p.as_p(), """<ul class="errorlist"><li>(Hidden field hidden_text) This field is required.</li></ul>
+        self.assertHTMLEqual(p.as_p(), """<ul class="errorlist nonfield"><li>(Hidden field hidden_text) This field is required.</li></ul>
 <p>First name: <input type="text" name="first_name" value="John" /></p>
 <p>Last name: <input type="text" name="last_name" value="Lennon" /></p>
 <p>Birthday: <input type="text" name="birthday" value="1940-10-9" /><input type="hidden" name="hidden_text" /></p>""")
@@ -1637,7 +1637,7 @@ class FormsTestCase(TestCase):
         # Case 2: POST with erroneous data (a redisplayed form, with errors).)
         self.assertHTMLEqual(my_function('POST', {'username': 'this-is-a-long-username', 'password1': 'foo', 'password2': 'bar'}), """<form action="" method="post">
 <table>
-<tr><td colspan="2"><ul class="errorlist"><li>Please make sure your passwords match.</li></ul></td></tr>
+<tr><td colspan="2"><ul class="errorlist nonfield"><li>Please make sure your passwords match.</li></ul></td></tr>
 <tr><th>Username:</th><td><ul class="errorlist"><li>Ensure this value has at most 10 characters (it has 23).</li></ul><input type="text" name="username" value="this-is-a-long-username" maxlength="10" /></td></tr>
 <tr><th>Password1:</th><td><input type="password" name="password1" /></td></tr>
 <tr><th>Password2:</th><td><input type="password" name="password2" /></td></tr>
@@ -1764,7 +1764,7 @@ class FormsTestCase(TestCase):
 <input type="submit" />
 </form>''')
         self.assertHTMLEqual(t.render(Context({'form': UserRegistration({'username': 'django', 'password1': 'foo', 'password2': 'bar'}, auto_id=False)})), """<form action="">
-<ul class="errorlist"><li>Please make sure your passwords match.</li></ul>
+<ul class="errorlist nonfield"><li>Please make sure your passwords match.</li></ul>
 <p><label>Your username: <input type="text" name="username" value="django" maxlength="10" /></label></p>
 <p><label>Password: <input type="password" name="password1" /></label></p>
 <p><label>Password (again): <input type="password" name="password2" /></label></p>
@@ -2137,7 +2137,7 @@ class FormsTestCase(TestCase):
         control = [
             '<li>foo<ul class="errorlist"><li>This field is required.</li></ul></li>',
             '<li>bar<ul class="errorlist"><li>This field is required.</li></ul></li>',
-            '<li>__all__<ul class="errorlist"><li>Non-field error.</li></ul></li>',
+            '<li>__all__<ul class="errorlist nonfield"><li>Non-field error.</li></ul></li>',
         ]
         for error in control:
             self.assertInHTML(error, errors)
@@ -2200,3 +2200,77 @@ class FormsTestCase(TestCase):
             json.loads(e.as_json()),
             [{"message": "Foo", "code": ""}, {"message": "Foobar", "code": "foobar"}]
         )
+
+    def test_error_list_class_not_specified(self):
+        e = ErrorList()
+        e.append('Foo')
+        e.append(ValidationError('Foo%(bar)s', code='foobar', params={'bar': 'bar'}))
+        self.assertEqual(
+            e.as_ul(),
+            '<ul class="errorlist"><li>Foo</li><li>Foobar</li></ul>'
+        )
+
+    def test_error_list_class_has_one_class_specified(self):
+        e = ErrorList(error_class='foobar-error-class')
+        e.append('Foo')
+        e.append(ValidationError('Foo%(bar)s', code='foobar', params={'bar': 'bar'}))
+        self.assertEqual(
+            e.as_ul(),
+            '<ul class="errorlist foobar-error-class"><li>Foo</li><li>Foobar</li></ul>'
+        )
+
+    def test_error_list_with_hidden_field_errors_has_correct_class(self):
+        class Person(Form):
+            first_name = CharField()
+            last_name = CharField(widget=HiddenInput)
+
+        p = Person({'first_name': 'John'})
+        self.assertHTMLEqual(
+            p.as_ul(),
+            """<li><ul class="errorlist nonfield"><li>(Hidden field last_name) This field is required.</li></ul></li><li><label for="id_first_name">First name:</label> <input id="id_first_name" name="first_name" type="text" value="John" /><input id="id_last_name" name="last_name" type="hidden" /></li>"""
+        )
+        self.assertHTMLEqual(
+            p.as_p(),
+            """<ul class="errorlist nonfield"><li>(Hidden field last_name) This field is required.</li></ul>
+<p><label for="id_first_name">First name:</label> <input id="id_first_name" name="first_name" type="text" value="John" /><input id="id_last_name" name="last_name" type="hidden" /></p>"""
+        )
+        self.assertHTMLEqual(
+            p.as_table(),
+            """<tr><td colspan="2"><ul class="errorlist nonfield"><li>(Hidden field last_name) This field is required.</li></ul></td></tr>
+<tr><th><label for="id_first_name">First name:</label></th><td><input id="id_first_name" name="first_name" type="text" value="John" /><input id="id_last_name" name="last_name" type="hidden" /></td></tr>"""
+        )
+
+    def test_error_list_with_non_field_errors_has_correct_class(self):
+        class Person(Form):
+            first_name = CharField()
+            last_name = CharField()
+
+            def clean(self):
+                raise ValidationError('Generic validation error')
+
+        p = Person({'first_name': 'John', 'last_name': 'Lennon'})
+        self.assertHTMLEqual(
+            str(p.non_field_errors()),
+            '<ul class="errorlist nonfield"><li>Generic validation error</li></ul>'
+        )
+        self.assertHTMLEqual(
+            p.as_ul(),
+            """<li><ul class="errorlist nonfield"><li>Generic validation error</li></ul></li><li><label for="id_first_name">First name:</label> <input id="id_first_name" name="first_name" type="text" value="John" /></li>
+<li><label for="id_last_name">Last name:</label> <input id="id_last_name" name="last_name" type="text" value="Lennon" /></li>"""
+        )
+        self.assertHTMLEqual(
+            p.non_field_errors().as_text(),
+            '* Generic validation error'
+        )
+        self.assertHTMLEqual(
+            p.as_p(),
+            """<ul class="errorlist nonfield"><li>Generic validation error</li></ul>
+<p><label for="id_first_name">First name:</label> <input id="id_first_name" name="first_name" type="text" value="John" /></p>
+<p><label for="id_last_name">Last name:</label> <input id="id_last_name" name="last_name" type="text" value="Lennon" /></p>"""
+        )
+        self.assertHTMLEqual(
+            p.as_table(),
+            """<tr><td colspan="2"><ul class="errorlist nonfield"><li>Generic validation error</li></ul></td></tr>
+<tr><th><label for="id_first_name">First name:</label></th><td><input id="id_first_name" name="first_name" type="text" value="John" /></td></tr>
+<tr><th><label for="id_last_name">Last name:</label></th><td><input id="id_last_name" name="last_name" type="text" value="Lennon" /></td></tr>"""
+        )
diff --git a/tests/forms_tests/tests/test_regressions.py b/tests/forms_tests/tests/test_regressions.py
index b009e800e1..4eea444808 100644
--- a/tests/forms_tests/tests/test_regressions.py
+++ b/tests/forms_tests/tests/test_regressions.py
@@ -98,8 +98,8 @@ class FormsRegressionsTestCase(TestCase):
             data = IntegerField(widget=HiddenInput)
 
         f = HiddenForm({})
-        self.assertHTMLEqual(f.as_p(), '<ul class="errorlist"><li>(Hidden field data) This field is required.</li></ul>\n<p> <input type="hidden" name="data" id="id_data" /></p>')
-        self.assertHTMLEqual(f.as_table(), '<tr><td colspan="2"><ul class="errorlist"><li>(Hidden field data) This field is required.</li></ul><input type="hidden" name="data" id="id_data" /></td></tr>')
+        self.assertHTMLEqual(f.as_p(), '<ul class="errorlist nonfield"><li>(Hidden field data) This field is required.</li></ul>\n<p> <input type="hidden" name="data" id="id_data" /></p>')
+        self.assertHTMLEqual(f.as_table(), '<tr><td colspan="2"><ul class="errorlist nonfield"><li>(Hidden field data) This field is required.</li></ul><input type="hidden" name="data" id="id_data" /></td></tr>')
 
     def test_xss_error_messages(self):
         ###################################################