Ticket #11836: multiplehiddeninput_unique_names.diff

django/forms/widgets.py

@@ -246 +246 @@
     A widget that handles <input type="hidden"> for fields that have a list
     of values.
     """
-    def __init__(self, attrs=None, choices=()):
+    def __init__(self, attrs=None, choices=(), unique_names=False):
         super(MultipleHiddenInput, self).__init__(attrs)
         # choices can be any iterable
         self.choices = choices
+        self.unique_names = unique_names
 
     def render(self, name, value, attrs=None, choices=()):
         if value is None: value = []
@@ -257 +258 @@
         id_ = final_attrs.get('id', None)
         inputs = []
         for i, v in enumerate(value):
+            if self.unique_names:
+                final_attrs['name'] = "%s_%s" % (name, i)
             input_attrs = dict(value=force_unicode(v), **final_attrs)
             if id_:
                 # An ID attribute was given. Add a numeric index as a suffix

docs/ref/forms/widgets.txt

@@ -42 +42 @@
 
     Multiple ``<input type='hidden' ...>`` widgets.
 
+    Takes one optional argument:
+    
+    .. attribute:: MultipleHiddenInput.unique_names
+
+        Determines whether the fields will have unique names 
+        ``name="name_0", name="name_1", etc`` (default is ``False``).
+
 .. class:: FileInput
 
     File upload input: ``<input type='file' ...>``

tests/regressiontests/forms/widgets.py

@@ -181 +181 @@
 >>> w.render('letters', list('abc'), attrs={'id': 'hideme'})
 u'<input type="hidden" name="letters" value="a" id="hideme_0" />\n<input type="hidden" name="letters" value="b" id="hideme_1" />\n<input type="hidden" name="letters" value="c" id="hideme_2" />'
 
+Each input gets a unique name.
+>>> w = MultipleHiddenInput(unique_names=True)
+>>> w.render('letters', list('abc'), attrs={'id': 'hideme'})
+u'<input type="hidden" name="letters_0" value="a" id="hideme_0" />\n<input type="hidden" name="letters_1" value="b" id="hideme_1" />\n<input type="hidden" name="letters_2" value="c" id="hideme_2" />'
+>>> data = {'letters': ['a', 'b', 'c']}
+>>> w.value_from_datadict(data, {}, "letters")
+['a', 'b', 'c']
+
 # FileInput Widget ############################################################
 
 FileInput widgets don't ever show the value, because the old value is of no use