class NullBooleanSelect
from django.forms import NullBooleanSelect
A Select Widget intended to be used with NullBooleanField.
Ancestors (MRO)
- NullBooleanSelect
- Select
- ChoiceWidget
- Widget
Attributes
| Defined in | |
|---|---|
add_id_index = False
|
Select |
add_id_index = True
|
ChoiceWidget |
allow_multiple_selected = False
|
ChoiceWidget |
checked_attribute = {'selected': True}
|
Select |
checked_attribute = {'checked': True}
|
ChoiceWidget |
input_type = 'select'
|
Select |
input_type = None
|
ChoiceWidget |
is_localized = False
|
Widget |
is_required = False
|
Widget |
needs_multipart_form = False
|
Widget |
option_inherits_attrs = False
|
Select |
option_inherits_attrs = True
|
ChoiceWidget |
option_template_name = 'django/forms/widgets/select_option.html'
|
Select |
option_template_name = None
|
ChoiceWidget |
supports_microseconds = True
|
Widget |
template_name = 'django/forms/widgets/select.html'
|
Select |
template_name = None
|
ChoiceWidget |
Properties
def
is_hidden():
¶
Widget
def
media():
¶
NullBooleanSelect
Getter
def _media(self):
# Get the media property of the superclass, if it exists
sup_cls = super(cls, self)
try:
base = sup_cls.media
except AttributeError:
base = Media()
# Get the media definition for this class
definition = getattr(cls, 'Media', None)
if definition:
extend = getattr(definition, 'extend', True)
if extend:
if extend is True:
m = base
else:
m = Media()
for medium in extend:
m = m + base[medium]
return m + Media(definition)
return Media(definition)
return base
def
media():
¶
Select
Getter
def _media(self):
# Get the media property of the superclass, if it exists
sup_cls = super(cls, self)
try:
base = sup_cls.media
except AttributeError:
base = Media()
# Get the media definition for this class
definition = getattr(cls, 'Media', None)
if definition:
extend = getattr(definition, 'extend', True)
if extend:
if extend is True:
m = base
else:
m = Media()
for medium in extend:
m = m + base[medium]
return m + Media(definition)
return Media(definition)
return base
def
media():
¶
ChoiceWidget
Getter
def _media(self):
# Get the media property of the superclass, if it exists
sup_cls = super(cls, self)
try:
base = sup_cls.media
except AttributeError:
base = Media()
# Get the media definition for this class
definition = getattr(cls, 'Media', None)
if definition:
extend = getattr(definition, 'extend', True)
if extend:
if extend is True:
m = base
else:
m = Media()
for medium in extend:
m = m + base[medium]
return m + Media(definition)
return Media(definition)
return base
def
media():
¶
Widget
Getter
def _media(self):
# Get the media property of the superclass, if it exists
sup_cls = super(cls, self)
try:
base = sup_cls.media
except AttributeError:
base = Media()
# Get the media definition for this class
definition = getattr(cls, 'Media', None)
if definition:
extend = getattr(definition, 'extend', True)
if extend:
if extend is True:
m = base
else:
m = Media()
for medium in extend:
m = m + base[medium]
return m + Media(definition)
return Media(definition)
return base
Methods
def
_choice_has_empty_value(choice):
¶
Select
Return True if the choice's value is empty string or None.
@staticmethod
def _choice_has_empty_value(choice):
"""Return True if the choice's value is empty string or None."""
value, _ = choice
return value is None or value == ''
def
_render(self, template_name, context, renderer=None):
¶
Widget
def _render(self, template_name, context, renderer=None):
if renderer is None:
renderer = get_default_renderer()
return mark_safe(renderer.render(template_name, context))
def
build_attrs(self, base_attrs, extra_attrs=None):
¶
Widget
Build an attribute dictionary.
def build_attrs(self, base_attrs, extra_attrs=None):
"""Build an attribute dictionary."""
return {**base_attrs, **(extra_attrs or {})}
def
create_option(self, name, value, label, selected, index, subindex=None, attrs=None):
¶
ChoiceWidget
def create_option(self, name, value, label, selected, index, subindex=None, attrs=None):
index = str(index) if subindex is None else "%s_%s" % (index, subindex)
if attrs is None:
attrs = {}
option_attrs = self.build_attrs(self.attrs, attrs) if self.option_inherits_attrs else {}
if selected:
option_attrs.update(self.checked_attribute)
if 'id' in option_attrs:
option_attrs['id'] = self.id_for_label(option_attrs['id'], index)
return {
'name': name,
'value': value,
'label': label,
'selected': selected,
'index': index,
'attrs': option_attrs,
'type': self.input_type,
'template_name': self.option_template_name,
'wrap_label': True,
}
def
format_value(self, value):
¶
NullBooleanSelect
def format_value(self, value):
try:
return {
True: 'true', False: 'false',
'true': 'true', 'false': 'false',
# For backwards compatibility with Django < 2.2.
'2': 'true', '3': 'false',
}[value]
except KeyError:
return 'unknown'
ChoiceWidget
Return selected values as a list.
def format_value(self, value):
"""Return selected values as a list."""
if value is None and self.allow_multiple_selected:
return []
if not isinstance(value, (tuple, list)):
value = [value]
return [str(v) if v is not None else '' for v in value]
Widget
Return a value as it should appear when rendered in a template.
def format_value(self, value):
"""
Return a value as it should appear when rendered in a template.
"""
if value == '' or value is None:
return None
if self.is_localized:
return formats.localize_input(value)
return str(value)
def
get_context(self, name, value, attrs):
¶
Select
def get_context(self, name, value, attrs):
context = super().get_context(name, value, attrs)
if self.allow_multiple_selected:
context['widget']['attrs']['multiple'] = True
return context
ChoiceWidget
def get_context(self, name, value, attrs):
context = super().get_context(name, value, attrs)
context['widget']['optgroups'] = self.optgroups(name, context['widget']['value'], attrs)
return context
Widget
def get_context(self, name, value, attrs):
context = {}
context['widget'] = {
'name': name,
'is_hidden': self.is_hidden,
'required': self.is_required,
'value': self.format_value(value),
'attrs': self.build_attrs(self.attrs, attrs),
'template_name': self.template_name,
}
return context
def
id_for_label(self, id_, index=0):
¶
ChoiceWidget
Use an incremented id for each option where the main widget
references the zero index.
def id_for_label(self, id_, index='0'):
"""
Use an incremented id for each option where the main widget
references the zero index.
"""
if id_ and self.add_id_index:
id_ = '%s_%s' % (id_, index)
return id_
Widget
Return the HTML ID attribute of this Widget for use by a <label>,
given the ID of the field. Return None if no ID is available.
This hook is necessary because some widgets have multiple HTML
elements and, thus, multiple IDs. In that case, this method should
return an ID value that corresponds to the first ID in the widget's
tags.
def id_for_label(self, id_):
"""
Return the HTML ID attribute of this Widget for use by a <label>,
given the ID of the field. Return None if no ID is available.
This hook is necessary because some widgets have multiple HTML
elements and, thus, multiple IDs. In that case, this method should
return an ID value that corresponds to the first ID in the widget's
tags.
"""
return id_
def
optgroups(self, name, value, attrs=None):
¶
ChoiceWidget
Return a list of optgroups for this widget.
def optgroups(self, name, value, attrs=None):
"""Return a list of optgroups for this widget."""
groups = []
has_selected = False
for index, (option_value, option_label) in enumerate(self.choices):
if option_value is None:
option_value = ''
subgroup = []
if isinstance(option_label, (list, tuple)):
group_name = option_value
subindex = 0
choices = option_label
else:
group_name = None
subindex = None
choices = [(option_value, option_label)]
groups.append((group_name, subgroup, index))
for subvalue, sublabel in choices:
selected = (
str(subvalue) in value and
(not has_selected or self.allow_multiple_selected)
)
has_selected |= selected
subgroup.append(self.create_option(
name, subvalue, sublabel, selected, index,
subindex=subindex, attrs=attrs,
))
if subindex is not None:
subindex += 1
return groups
def
options(self, name, value, attrs=None):
¶
ChoiceWidget
Yield a flat list of options for this widgets.
def options(self, name, value, attrs=None):
"""Yield a flat list of options for this widgets."""
for group in self.optgroups(name, value, attrs):
yield from group[1]
def
render(self, name, value, attrs=None, renderer=None):
¶
Widget
Render the widget as an HTML string.
def render(self, name, value, attrs=None, renderer=None):
"""Render the widget as an HTML string."""
context = self.get_context(name, value, attrs)
return self._render(self.template_name, context, renderer)
def
subwidgets(self, name, value, attrs=None):
¶
ChoiceWidget
Yield all "subwidgets" of this widget. Used to enable iterating
options from a BoundField for choice widgets.
def subwidgets(self, name, value, attrs=None):
"""
Yield all "subwidgets" of this widget. Used to enable iterating
options from a BoundField for choice widgets.
"""
value = self.format_value(value)
yield from self.options(name, value, attrs)
Widget
def subwidgets(self, name, value, attrs=None):
context = self.get_context(name, value, attrs)
yield context['widget']
def
use_required_attribute(self, initial):
¶
Select
Don't render 'required' if the first <option> has a value, as that's
invalid HTML.
def use_required_attribute(self, initial):
"""
Don't render 'required' if the first <option> has a value, as that's
invalid HTML.
"""
use_required_attribute = super().use_required_attribute(initial)
# 'required' is always okay for <select multiple>.
if self.allow_multiple_selected:
return use_required_attribute
first_choice = next(iter(self.choices), None)
return use_required_attribute and first_choice is not None and self._choice_has_empty_value(first_choice)
Widget
def use_required_attribute(self, initial):
return not self.is_hidden
def
value_from_datadict(self, data, files, name):
¶
NullBooleanSelect
def value_from_datadict(self, data, files, name):
value = data.get(name)
return {
True: True,
'True': True,
'False': False,
False: False,
'true': True,
'false': False,
# For backwards compatibility with Django < 2.2.
'2': True,
'3': False,
}.get(value)
ChoiceWidget
def value_from_datadict(self, data, files, name):
getter = data.get
if self.allow_multiple_selected:
try:
getter = data.getlist
except AttributeError:
pass
return getter(name)
Widget
Given a dictionary of data and this widget's name, return the value
of this widget or None if it's not provided.
def value_from_datadict(self, data, files, name):
"""
Given a dictionary of data and this widget's name, return the value
of this widget or None if it's not provided.
"""
return data.get(name)
def
value_omitted_from_data(self, data, files, name):
¶
Widget
def value_omitted_from_data(self, data, files, name):
return name not in data