Fixed #20684 -- Added support for HTML5 boolean attributes to form widgets.

django/forms/utils.py

@@ -2,7 +2,6 @@ from __future__ import unicode_literals
 
 import json
 import sys
-import warnings
 
 try:
     from collections import UserList
@@ -10,7 +9,6 @@ except ImportError:  # Python 2
     from UserList import UserList
 
 from django.conf import settings
-from django.utils.deprecation import RemovedInDjango18Warning
 from django.utils.encoding import force_text, python_2_unicode_compatible
 from django.utils.html import format_html, format_html_join, escape
 from django.utils import timezone
@@ -31,19 +29,18 @@ def flatatt(attrs):
 
     The result is passed through 'mark_safe'.
     """
-    for attr_name, value in attrs.items():
-        if type(value) is bool:
-            warnings.warn(
-                "In Django 1.8, widget attribute %(attr_name)s=%(bool_value)s "
-                "will %(action)s. To preserve current behavior, use the "
-                "string '%(bool_value)s' instead of the boolean value." % {
-                    'attr_name': attr_name,
-                    'action': "be rendered as '%s'" % attr_name if value else "not be rendered",
-                    'bool_value': value,
-                },
-                RemovedInDjango18Warning
-            )
-    return format_html_join('', ' {0}="{1}"', sorted(attrs.items()))
+    boolean_attrs = []
+    for attr, value in list(attrs.items()):
+        if value is True:
+            boolean_attrs.append((attr,))
+            del attrs[attr]
+        elif value is False:
+            del attrs[attr]
+
+    return (
+        format_html_join('', ' {0}="{1}"', sorted(attrs.items())) +
+        format_html_join('', ' {0}', sorted(boolean_attrs))
+    )
 
 
 @python_2_unicode_compatible

docs/ref/forms/widgets.txt

@@ -205,6 +205,19 @@ foundation for custom widgets.
             >>> name.render('name', 'A name')
             u'<input title="Your name" type="text" name="name" value="A name" size="10" />'
 
+        .. versionchanged:: 1.8
+
+            If you assign a value of ``True`` or ``False`` to an attribute,
+            it will be rendered as an HTML5 boolean attribute::
+
+                >>> name = forms.TextInput(attrs={'required': True})
+                >>> name.render('name', 'A name')
+                '<input name="name" type="text" value="A name" required />'
+                >>>
+                >>> name = forms.TextInput(attrs={'required': False})
+                >>> name.render('name', 'A name')
+                '<input name="name" type="text" value="A name" />'
+
     .. method:: render(name, value, attrs=None)
 
         Returns HTML for the widget, as a Unicode string. This method must be

docs/releases/1.8.txt

@@ -106,7 +106,8 @@ File Uploads
 Forms
 ^^^^^
 
-* ...
+* Form widgets now render attributes with a value of ``True`` or ``False``
+  as HTML5 boolean attributes.
 
 Internationalization
 ^^^^^^^^^^^^^^^^^^^^

tests/forms_tests/tests/test_util.py

@@ -20,6 +20,9 @@ class FormsUtilTestCase(TestCase):
 
         self.assertEqual(flatatt({'id': "header"}), ' id="header"')
         self.assertEqual(flatatt({'class': "news", 'title': "Read this"}), ' class="news" title="Read this"')
+        self.assertEqual(flatatt({'class': "news", 'title': "Read this", 'required': "required"}), ' class="news" required="required" title="Read this"')
+        self.assertEqual(flatatt({'class': "news", 'title': "Read this", 'required': True}), ' class="news" title="Read this" required')
+        self.assertEqual(flatatt({'class': "news", 'title': "Read this", 'required': False}), ' class="news" title="Read this"')
         self.assertEqual(flatatt({}), '')
 
     def test_validation_error(self):