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venv/Lib/site-packages/django/forms/boundfield.py
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295
venv/Lib/site-packages/django/forms/boundfield.py
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import re
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from django.core.exceptions import ValidationError
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from django.forms.utils import pretty_name
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from django.forms.widgets import MultiWidget, Textarea, TextInput
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from django.utils.functional import cached_property
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from django.utils.html import format_html, html_safe
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from django.utils.translation import gettext_lazy as _
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__all__ = ('BoundField',)
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@html_safe
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class BoundField:
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"A Field plus data"
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def __init__(self, form, field, name):
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self.form = form
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self.field = field
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self.name = name
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self.html_name = form.add_prefix(name)
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self.html_initial_name = form.add_initial_prefix(name)
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self.html_initial_id = form.add_initial_prefix(self.auto_id)
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if self.field.label is None:
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self.label = pretty_name(name)
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else:
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self.label = self.field.label
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self.help_text = field.help_text or ''
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def __str__(self):
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"""Render this field as an HTML widget."""
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if self.field.show_hidden_initial:
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return self.as_widget() + self.as_hidden(only_initial=True)
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return self.as_widget()
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@cached_property
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def subwidgets(self):
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"""
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Most widgets yield a single subwidget, but others like RadioSelect and
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CheckboxSelectMultiple produce one subwidget for each choice.
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This property is cached so that only one database query occurs when
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rendering ModelChoiceFields.
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"""
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id_ = self.field.widget.attrs.get('id') or self.auto_id
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attrs = {'id': id_} if id_ else {}
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attrs = self.build_widget_attrs(attrs)
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return [
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BoundWidget(self.field.widget, widget, self.form.renderer)
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for widget in self.field.widget.subwidgets(self.html_name, self.value(), attrs=attrs)
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]
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def __bool__(self):
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# BoundField evaluates to True even if it doesn't have subwidgets.
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return True
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def __iter__(self):
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return iter(self.subwidgets)
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def __len__(self):
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return len(self.subwidgets)
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def __getitem__(self, idx):
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# Prevent unnecessary reevaluation when accessing BoundField's attrs
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# from templates.
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if not isinstance(idx, (int, slice)):
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raise TypeError(
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'BoundField indices must be integers or slices, not %s.'
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% type(idx).__name__
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)
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return self.subwidgets[idx]
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@property
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def errors(self):
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"""
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Return an ErrorList (empty if there are no errors) for this field.
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"""
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return self.form.errors.get(self.name, self.form.error_class(renderer=self.form.renderer))
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def as_widget(self, widget=None, attrs=None, only_initial=False):
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"""
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Render the field by rendering the passed widget, adding any HTML
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attributes passed as attrs. If a widget isn't specified, use the
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field's default widget.
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"""
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widget = widget or self.field.widget
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if self.field.localize:
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widget.is_localized = True
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attrs = attrs or {}
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attrs = self.build_widget_attrs(attrs, widget)
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if self.auto_id and 'id' not in widget.attrs:
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attrs.setdefault('id', self.html_initial_id if only_initial else self.auto_id)
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return widget.render(
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name=self.html_initial_name if only_initial else self.html_name,
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value=self.value(),
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attrs=attrs,
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renderer=self.form.renderer,
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)
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def as_text(self, attrs=None, **kwargs):
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"""
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Return a string of HTML for representing this as an <input type="text">.
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"""
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return self.as_widget(TextInput(), attrs, **kwargs)
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def as_textarea(self, attrs=None, **kwargs):
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"""Return a string of HTML for representing this as a <textarea>."""
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return self.as_widget(Textarea(), attrs, **kwargs)
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def as_hidden(self, attrs=None, **kwargs):
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"""
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Return a string of HTML for representing this as an <input type="hidden">.
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"""
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return self.as_widget(self.field.hidden_widget(), attrs, **kwargs)
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@property
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def data(self):
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"""
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Return the data for this BoundField, or None if it wasn't given.
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"""
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return self.form._widget_data_value(self.field.widget, self.html_name)
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def value(self):
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"""
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Return the value for this BoundField, using the initial value if
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the form is not bound or the data otherwise.
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"""
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data = self.initial
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if self.form.is_bound:
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data = self.field.bound_data(self.data, data)
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return self.field.prepare_value(data)
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def _has_changed(self):
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field = self.field
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if field.show_hidden_initial:
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hidden_widget = field.hidden_widget()
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initial_value = self.form._widget_data_value(
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hidden_widget, self.html_initial_name,
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)
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try:
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initial_value = field.to_python(initial_value)
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except ValidationError:
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# Always assume data has changed if validation fails.
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return True
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else:
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initial_value = self.initial
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return field.has_changed(initial_value, self.data)
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def label_tag(self, contents=None, attrs=None, label_suffix=None):
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"""
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Wrap the given contents in a <label>, if the field has an ID attribute.
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contents should be mark_safe'd to avoid HTML escaping. If contents
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aren't given, use the field's HTML-escaped label.
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If attrs are given, use them as HTML attributes on the <label> tag.
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label_suffix overrides the form's label_suffix.
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"""
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contents = contents or self.label
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if label_suffix is None:
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label_suffix = (self.field.label_suffix if self.field.label_suffix is not None
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else self.form.label_suffix)
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# Only add the suffix if the label does not end in punctuation.
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# Translators: If found as last label character, these punctuation
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# characters will prevent the default label_suffix to be appended to the label
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if label_suffix and contents and contents[-1] not in _(':?.!'):
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contents = format_html('{}{}', contents, label_suffix)
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widget = self.field.widget
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id_ = widget.attrs.get('id') or self.auto_id
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if id_:
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id_for_label = widget.id_for_label(id_)
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if id_for_label:
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attrs = {**(attrs or {}), 'for': id_for_label}
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if self.field.required and hasattr(self.form, 'required_css_class'):
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attrs = attrs or {}
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if 'class' in attrs:
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attrs['class'] += ' ' + self.form.required_css_class
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else:
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attrs['class'] = self.form.required_css_class
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context = {
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'field': self,
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'label': contents,
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'attrs': attrs,
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'use_tag': bool(id_),
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}
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return self.form.render(self.form.template_name_label, context)
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def css_classes(self, extra_classes=None):
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"""
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Return a string of space-separated CSS classes for this field.
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"""
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if hasattr(extra_classes, 'split'):
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extra_classes = extra_classes.split()
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extra_classes = set(extra_classes or [])
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if self.errors and hasattr(self.form, 'error_css_class'):
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extra_classes.add(self.form.error_css_class)
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if self.field.required and hasattr(self.form, 'required_css_class'):
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extra_classes.add(self.form.required_css_class)
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return ' '.join(extra_classes)
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@property
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def is_hidden(self):
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"""Return True if this BoundField's widget is hidden."""
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return self.field.widget.is_hidden
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@property
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def auto_id(self):
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"""
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Calculate and return the ID attribute for this BoundField, if the
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associated Form has specified auto_id. Return an empty string otherwise.
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"""
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auto_id = self.form.auto_id # Boolean or string
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if auto_id and '%s' in str(auto_id):
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return auto_id % self.html_name
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elif auto_id:
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return self.html_name
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return ''
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@property
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def id_for_label(self):
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"""
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Wrapper around the field widget's `id_for_label` method.
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Useful, for example, for focusing on this field regardless of whether
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it has a single widget or a MultiWidget.
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"""
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widget = self.field.widget
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id_ = widget.attrs.get('id') or self.auto_id
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return widget.id_for_label(id_)
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@cached_property
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def initial(self):
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return self.form.get_initial_for_field(self.field, self.name)
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def build_widget_attrs(self, attrs, widget=None):
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widget = widget or self.field.widget
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attrs = dict(attrs) # Copy attrs to avoid modifying the argument.
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if widget.use_required_attribute(self.initial) and self.field.required and self.form.use_required_attribute:
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# MultiValueField has require_all_fields: if False, fall back
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# on subfields.
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if (
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hasattr(self.field, 'require_all_fields') and
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not self.field.require_all_fields and
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isinstance(self.field.widget, MultiWidget)
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):
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for subfield, subwidget in zip(self.field.fields, widget.widgets):
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subwidget.attrs['required'] = subwidget.use_required_attribute(self.initial) and subfield.required
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else:
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attrs['required'] = True
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if self.field.disabled:
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attrs['disabled'] = True
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return attrs
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@property
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def widget_type(self):
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return re.sub(r'widget$|input$', '', self.field.widget.__class__.__name__.lower())
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@html_safe
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class BoundWidget:
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"""
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A container class used for iterating over widgets. This is useful for
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widgets that have choices. For example, the following can be used in a
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template:
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{% for radio in myform.beatles %}
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<label for="{{ radio.id_for_label }}">
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{{ radio.choice_label }}
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<span class="radio">{{ radio.tag }}</span>
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</label>
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{% endfor %}
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"""
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def __init__(self, parent_widget, data, renderer):
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self.parent_widget = parent_widget
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self.data = data
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self.renderer = renderer
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def __str__(self):
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return self.tag(wrap_label=True)
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def tag(self, wrap_label=False):
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context = {'widget': {**self.data, 'wrap_label': wrap_label}}
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return self.parent_widget._render(self.template_name, context, self.renderer)
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@property
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def template_name(self):
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if 'template_name' in self.data:
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return self.data['template_name']
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return self.parent_widget.template_name
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@property
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def id_for_label(self):
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return self.data['attrs'].get('id')
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@property
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def choice_label(self):
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return self.data['label']
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