296 lines
11 KiB
Python
296 lines
11 KiB
Python
import re
|
|
|
|
from django.core.exceptions import ValidationError
|
|
from django.forms.utils import pretty_name
|
|
from django.forms.widgets import MultiWidget, Textarea, TextInput
|
|
from django.utils.functional import cached_property
|
|
from django.utils.html import format_html, html_safe
|
|
from django.utils.translation import gettext_lazy as _
|
|
|
|
__all__ = ('BoundField',)
|
|
|
|
|
|
@html_safe
|
|
class BoundField:
|
|
"A Field plus data"
|
|
def __init__(self, form, field, name):
|
|
self.form = form
|
|
self.field = field
|
|
self.name = name
|
|
self.html_name = form.add_prefix(name)
|
|
self.html_initial_name = form.add_initial_prefix(name)
|
|
self.html_initial_id = form.add_initial_prefix(self.auto_id)
|
|
if self.field.label is None:
|
|
self.label = pretty_name(name)
|
|
else:
|
|
self.label = self.field.label
|
|
self.help_text = field.help_text or ''
|
|
|
|
def __str__(self):
|
|
"""Render this field as an HTML widget."""
|
|
if self.field.show_hidden_initial:
|
|
return self.as_widget() + self.as_hidden(only_initial=True)
|
|
return self.as_widget()
|
|
|
|
@cached_property
|
|
def subwidgets(self):
|
|
"""
|
|
Most widgets yield a single subwidget, but others like RadioSelect and
|
|
CheckboxSelectMultiple produce one subwidget for each choice.
|
|
|
|
This property is cached so that only one database query occurs when
|
|
rendering ModelChoiceFields.
|
|
"""
|
|
id_ = self.field.widget.attrs.get('id') or self.auto_id
|
|
attrs = {'id': id_} if id_ else {}
|
|
attrs = self.build_widget_attrs(attrs)
|
|
return [
|
|
BoundWidget(self.field.widget, widget, self.form.renderer)
|
|
for widget in self.field.widget.subwidgets(self.html_name, self.value(), attrs=attrs)
|
|
]
|
|
|
|
def __bool__(self):
|
|
# BoundField evaluates to True even if it doesn't have subwidgets.
|
|
return True
|
|
|
|
def __iter__(self):
|
|
return iter(self.subwidgets)
|
|
|
|
def __len__(self):
|
|
return len(self.subwidgets)
|
|
|
|
def __getitem__(self, idx):
|
|
# Prevent unnecessary reevaluation when accessing BoundField's attrs
|
|
# from templates.
|
|
if not isinstance(idx, (int, slice)):
|
|
raise TypeError(
|
|
'BoundField indices must be integers or slices, not %s.'
|
|
% type(idx).__name__
|
|
)
|
|
return self.subwidgets[idx]
|
|
|
|
@property
|
|
def errors(self):
|
|
"""
|
|
Return an ErrorList (empty if there are no errors) for this field.
|
|
"""
|
|
return self.form.errors.get(self.name, self.form.error_class(renderer=self.form.renderer))
|
|
|
|
def as_widget(self, widget=None, attrs=None, only_initial=False):
|
|
"""
|
|
Render the field by rendering the passed widget, adding any HTML
|
|
attributes passed as attrs. If a widget isn't specified, use the
|
|
field's default widget.
|
|
"""
|
|
widget = widget or self.field.widget
|
|
if self.field.localize:
|
|
widget.is_localized = True
|
|
attrs = attrs or {}
|
|
attrs = self.build_widget_attrs(attrs, widget)
|
|
if self.auto_id and 'id' not in widget.attrs:
|
|
attrs.setdefault('id', self.html_initial_id if only_initial else self.auto_id)
|
|
return widget.render(
|
|
name=self.html_initial_name if only_initial else self.html_name,
|
|
value=self.value(),
|
|
attrs=attrs,
|
|
renderer=self.form.renderer,
|
|
)
|
|
|
|
def as_text(self, attrs=None, **kwargs):
|
|
"""
|
|
Return a string of HTML for representing this as an <input type="text">.
|
|
"""
|
|
return self.as_widget(TextInput(), attrs, **kwargs)
|
|
|
|
def as_textarea(self, attrs=None, **kwargs):
|
|
"""Return a string of HTML for representing this as a <textarea>."""
|
|
return self.as_widget(Textarea(), attrs, **kwargs)
|
|
|
|
def as_hidden(self, attrs=None, **kwargs):
|
|
"""
|
|
Return a string of HTML for representing this as an <input type="hidden">.
|
|
"""
|
|
return self.as_widget(self.field.hidden_widget(), attrs, **kwargs)
|
|
|
|
@property
|
|
def data(self):
|
|
"""
|
|
Return the data for this BoundField, or None if it wasn't given.
|
|
"""
|
|
return self.form._widget_data_value(self.field.widget, self.html_name)
|
|
|
|
def value(self):
|
|
"""
|
|
Return the value for this BoundField, using the initial value if
|
|
the form is not bound or the data otherwise.
|
|
"""
|
|
data = self.initial
|
|
if self.form.is_bound:
|
|
data = self.field.bound_data(self.data, data)
|
|
return self.field.prepare_value(data)
|
|
|
|
def _has_changed(self):
|
|
field = self.field
|
|
if field.show_hidden_initial:
|
|
hidden_widget = field.hidden_widget()
|
|
initial_value = self.form._widget_data_value(
|
|
hidden_widget, self.html_initial_name,
|
|
)
|
|
try:
|
|
initial_value = field.to_python(initial_value)
|
|
except ValidationError:
|
|
# Always assume data has changed if validation fails.
|
|
return True
|
|
else:
|
|
initial_value = self.initial
|
|
return field.has_changed(initial_value, self.data)
|
|
|
|
def label_tag(self, contents=None, attrs=None, label_suffix=None):
|
|
"""
|
|
Wrap the given contents in a <label>, if the field has an ID attribute.
|
|
contents should be mark_safe'd to avoid HTML escaping. If contents
|
|
aren't given, use the field's HTML-escaped label.
|
|
|
|
If attrs are given, use them as HTML attributes on the <label> tag.
|
|
|
|
label_suffix overrides the form's label_suffix.
|
|
"""
|
|
contents = contents or self.label
|
|
if label_suffix is None:
|
|
label_suffix = (self.field.label_suffix if self.field.label_suffix is not None
|
|
else self.form.label_suffix)
|
|
# Only add the suffix if the label does not end in punctuation.
|
|
# Translators: If found as last label character, these punctuation
|
|
# characters will prevent the default label_suffix to be appended to the label
|
|
if label_suffix and contents and contents[-1] not in _(':?.!'):
|
|
contents = format_html('{}{}', contents, label_suffix)
|
|
widget = self.field.widget
|
|
id_ = widget.attrs.get('id') or self.auto_id
|
|
if id_:
|
|
id_for_label = widget.id_for_label(id_)
|
|
if id_for_label:
|
|
attrs = {**(attrs or {}), 'for': id_for_label}
|
|
if self.field.required and hasattr(self.form, 'required_css_class'):
|
|
attrs = attrs or {}
|
|
if 'class' in attrs:
|
|
attrs['class'] += ' ' + self.form.required_css_class
|
|
else:
|
|
attrs['class'] = self.form.required_css_class
|
|
context = {
|
|
'field': self,
|
|
'label': contents,
|
|
'attrs': attrs,
|
|
'use_tag': bool(id_),
|
|
}
|
|
return self.form.render(self.form.template_name_label, context)
|
|
|
|
def css_classes(self, extra_classes=None):
|
|
"""
|
|
Return a string of space-separated CSS classes for this field.
|
|
"""
|
|
if hasattr(extra_classes, 'split'):
|
|
extra_classes = extra_classes.split()
|
|
extra_classes = set(extra_classes or [])
|
|
if self.errors and hasattr(self.form, 'error_css_class'):
|
|
extra_classes.add(self.form.error_css_class)
|
|
if self.field.required and hasattr(self.form, 'required_css_class'):
|
|
extra_classes.add(self.form.required_css_class)
|
|
return ' '.join(extra_classes)
|
|
|
|
@property
|
|
def is_hidden(self):
|
|
"""Return True if this BoundField's widget is hidden."""
|
|
return self.field.widget.is_hidden
|
|
|
|
@property
|
|
def auto_id(self):
|
|
"""
|
|
Calculate and return the ID attribute for this BoundField, if the
|
|
associated Form has specified auto_id. Return an empty string otherwise.
|
|
"""
|
|
auto_id = self.form.auto_id # Boolean or string
|
|
if auto_id and '%s' in str(auto_id):
|
|
return auto_id % self.html_name
|
|
elif auto_id:
|
|
return self.html_name
|
|
return ''
|
|
|
|
@property
|
|
def id_for_label(self):
|
|
"""
|
|
Wrapper around the field widget's `id_for_label` method.
|
|
Useful, for example, for focusing on this field regardless of whether
|
|
it has a single widget or a MultiWidget.
|
|
"""
|
|
widget = self.field.widget
|
|
id_ = widget.attrs.get('id') or self.auto_id
|
|
return widget.id_for_label(id_)
|
|
|
|
@cached_property
|
|
def initial(self):
|
|
return self.form.get_initial_for_field(self.field, self.name)
|
|
|
|
def build_widget_attrs(self, attrs, widget=None):
|
|
widget = widget or self.field.widget
|
|
attrs = dict(attrs) # Copy attrs to avoid modifying the argument.
|
|
if widget.use_required_attribute(self.initial) and self.field.required and self.form.use_required_attribute:
|
|
# MultiValueField has require_all_fields: if False, fall back
|
|
# on subfields.
|
|
if (
|
|
hasattr(self.field, 'require_all_fields') and
|
|
not self.field.require_all_fields and
|
|
isinstance(self.field.widget, MultiWidget)
|
|
):
|
|
for subfield, subwidget in zip(self.field.fields, widget.widgets):
|
|
subwidget.attrs['required'] = subwidget.use_required_attribute(self.initial) and subfield.required
|
|
else:
|
|
attrs['required'] = True
|
|
if self.field.disabled:
|
|
attrs['disabled'] = True
|
|
return attrs
|
|
|
|
@property
|
|
def widget_type(self):
|
|
return re.sub(r'widget$|input$', '', self.field.widget.__class__.__name__.lower())
|
|
|
|
|
|
@html_safe
|
|
class BoundWidget:
|
|
"""
|
|
A container class used for iterating over widgets. This is useful for
|
|
widgets that have choices. For example, the following can be used in a
|
|
template:
|
|
|
|
{% for radio in myform.beatles %}
|
|
<label for="{{ radio.id_for_label }}">
|
|
{{ radio.choice_label }}
|
|
<span class="radio">{{ radio.tag }}</span>
|
|
</label>
|
|
{% endfor %}
|
|
"""
|
|
def __init__(self, parent_widget, data, renderer):
|
|
self.parent_widget = parent_widget
|
|
self.data = data
|
|
self.renderer = renderer
|
|
|
|
def __str__(self):
|
|
return self.tag(wrap_label=True)
|
|
|
|
def tag(self, wrap_label=False):
|
|
context = {'widget': {**self.data, 'wrap_label': wrap_label}}
|
|
return self.parent_widget._render(self.template_name, context, self.renderer)
|
|
|
|
@property
|
|
def template_name(self):
|
|
if 'template_name' in self.data:
|
|
return self.data['template_name']
|
|
return self.parent_widget.template_name
|
|
|
|
@property
|
|
def id_for_label(self):
|
|
return self.data['attrs'].get('id')
|
|
|
|
@property
|
|
def choice_label(self):
|
|
return self.data['label']
|