See the blog entry for details.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 | from django import newforms as forms
from django.utils.encoding import StrAndUnicode, force_unicode
from django.utils.safestring import mark_safe
class ChoiceWithOtherRenderer(forms.RadioSelect.renderer):
"""RadioFieldRenderer that renders its last choice with a placeholder."""
def __init__(self, *args, **kwargs):
super(ChoiceWithOtherRenderer, self).__init__(*args, **kwargs)
self.choices, self.other = self.choices[:-1], self.choices[-1]
def __iter__(self):
for input in super(ChoiceWithOtherRenderer, self).__iter__():
yield input
id = '%s_%s' % (self.attrs['id'], self.other[0]) if 'id' in self.attrs else ''
label_for = ' for="%s"' % id if id else ''
checked = '' if not force_unicode(self.other[0]) == self.value else 'checked="true" '
yield '<label%s><input type="radio" id="%s" value="%s" name="%s" %s/> %s</label> %%s' % (
label_for, id, self.other[0], self.name, checked, self.other[1])
class ChoiceWithOtherWidget(forms.MultiWidget):
"""MultiWidget for use with ChoiceWithOtherField."""
def __init__(self, choices):
widgets = [
forms.RadioSelect(choices=choices, renderer=ChoiceWithOtherRenderer),
forms.TextInput
]
super(ChoiceWithOtherWidget, self).__init__(widgets)
def decompress(self, value):
if not value:
return [None, None]
return value
def format_output(self, rendered_widgets):
"""Format the output by substituting the "other" choice into the first widget."""
return rendered_widgets[0] % rendered_widgets[1]
class ChoiceWithOtherField(forms.MultiValueField):
"""
ChoiceField with an option for a user-submitted "other" value.
The last item in the choices array passed to __init__ is expected to be a choice for "other". This field's
cleaned data is a tuple consisting of the choice the user made, and the "other" field typed in if the choice
made was the last one.
>>> class AgeForm(forms.Form):
... age = ChoiceWithOtherField(choices=[
... (0, '15-29'),
... (1, '30-44'),
... (2, '45-60'),
... (3, 'Other, please specify:')
... ])
...
>>> # rendered as a RadioSelect choice field whose last choice has a text input
... print AgeForm()['age']
<ul>
<li><label for="id_age_0_0"><input type="radio" id="id_age_0_0" value="0" name="age_0" /> 15-29</label></li>
<li><label for="id_age_0_1"><input type="radio" id="id_age_0_1" value="1" name="age_0" /> 30-44</label></li>
<li><label for="id_age_0_2"><input type="radio" id="id_age_0_2" value="2" name="age_0" /> 45-60</label></li>
<li><label for="id_age_0_3"><input type="radio" id="id_age_0_3" value="3" name="age_0" /> Other, please \
specify:</label> <input type="text" name="age_1" id="id_age_1" /></li>
</ul>
>>> form = AgeForm({'age_0': 2})
>>> form.is_valid()
True
>>> form.cleaned_data
{'age': (u'2', u'')}
>>> form = AgeForm({'age_0': 3, 'age_1': 'I am 10 years old'})
>>> form.is_valid()
True
>>> form.cleaned_data
{'age': (u'3', u'I am 10 years old')}
>>> form = AgeForm({'age_0': 1, 'age_1': 'This is bogus text which is ignored since I didn\\'t pick "other"'})
>>> form.is_valid()
True
>>> form.cleaned_data
{'age': (u'1', u'')}
"""
def __init__(self, *args, **kwargs):
fields = [
forms.ChoiceField(widget=forms.RadioSelect(renderer=ChoiceWithOtherRenderer), *args, **kwargs),
forms.CharField(required=False)
]
widget = ChoiceWithOtherWidget(choices=kwargs['choices'])
kwargs.pop('choices')
self._was_required = kwargs.pop('required', True)
kwargs['required'] = False
super(ChoiceWithOtherField, self).__init__(widget=widget, fields=fields, *args, **kwargs)
def compress(self, value):
if self._was_required and not value or value[0] in (None, ''):
raise forms.ValidationError(self.error_messages['required'])
if not value:
return [None, u'']
return (value[0], value[1] if force_unicode(value[0]) == force_unicode(self.fields[0].choices[-1][0]) else u'')
|
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Comments
Pydev found some of your imports unneeded. The revised imports:
#
Line 17
django 1.5 will display the raw text without
mark_safe
#
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