[1.1.X] Fixed #11843 - Give MultipleHiddenInput different IDs. Thanks Chris Beaven.

    def render(self, name, value, attrs=None, choices=()):

        if value is None: value = []

        final_attrs = self.build_attrs(attrs, type=self.input_type, name=name)

        return mark_safe(u'\n'.join([(u'<input%s />' %

            flatatt(dict(value=force_unicode(v), **final_attrs)))

            for v in value]))

        id_ = final_attrs.get('id', None)

        inputs = []

        for i, v in enumerate(value):

            input_attrs = dict(value=force_unicode(v), **final_attrs)

            if id_:

                # An ID attribute was given. Add a numeric index as a suffix

                # so that the inputs don't all have the same ID attribute.

                input_attrs['id'] = '%s_%s' % (id_, i)

            inputs.append(u'<input%s />' % flatatt(input_attrs))

        return mark_safe(u'\n'.join(inputs))

    def value_from_datadict(self, data, files, name):

        if isinstance(data, (MultiValueDict, MergeDict)):

>>> w.render('email', ['foo@example.com'], attrs={'class': 'special'})

u'<input type="hidden" class="special" value="foo@example.com" name="email" />'

Each input gets a separate ID.

>>> w = MultipleHiddenInput()

>>> 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" />'

# FileInput Widget ############################################################

FileInput widgets don't ever show the value, because the old value is of no use

>>> w.render('nums', ['ŠĐĆŽćžšđ'], choices=[('ŠĐĆŽćžšđ', 'ŠĐabcĆŽćžšđ'), ('ćžšđ', 'abcćžšđ')])

u'<ul>\n<li><label><input type="checkbox" name="nums" value="1" /> 1</label></li>\n<li><label><input type="checkbox" name="nums" value="2" /> 2</label></li>\n<li><label><input type="checkbox" name="nums" value="3" /> 3</label></li>\n<li><label><input checked="checked" type="checkbox" name="nums" value="\u0160\u0110\u0106\u017d\u0107\u017e\u0161\u0111" /> \u0160\u0110abc\u0106\u017d\u0107\u017e\u0161\u0111</label></li>\n<li><label><input type="checkbox" name="nums" value="\u0107\u017e\u0161\u0111" /> abc\u0107\u017e\u0161\u0111</label></li>\n</ul>'

# Each input gets a separate ID

>>> print CheckboxSelectMultiple().render('letters', list('ac'), choices=zip(list('abc'), list('ABC')), attrs={'id': 'abc'})

<ul>

<li><label for="abc_0"><input checked="checked" type="checkbox" name="letters" value="a" id="abc_0" /> A</label></li>

<li><label for="abc_1"><input type="checkbox" name="letters" value="b" id="abc_1" /> B</label></li>

<li><label for="abc_2"><input checked="checked" type="checkbox" name="letters" value="c" id="abc_2" /> C</label></li>

</ul>

# MultiWidget #################################################################

>>> class MyMultiWidget(MultiWidget):