243 lines
9.1 KiB
Python
243 lines
9.1 KiB
Python
from __future__ import unicode_literals
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import datetime
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from django.forms.utils import flatatt, pretty_name
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from django.forms.widgets import Textarea, TextInput
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from django.utils import six
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from django.utils.encoding import (
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force_text, python_2_unicode_compatible, smart_text,
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)
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from django.utils.functional import cached_property
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from django.utils.html import conditional_escape, format_html, html_safe
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from django.utils.safestring import mark_safe
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from django.utils.translation import ugettext_lazy as _
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__all__ = ('BoundField',)
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UNSET = object()
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@html_safe
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@python_2_unicode_compatible
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class BoundField(object):
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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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self._initial_value = UNSET
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def __str__(self):
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"""Renders 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 list(self.field.widget.subwidgets(self.html_name, self.value(), attrs))
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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, six.integer_types + (slice,)):
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raise TypeError
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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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Returns an ErrorList for this field. Returns an empty ErrorList
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if there are none.
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"""
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return self.form.errors.get(self.name, self.form.error_class())
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def as_widget(self, widget=None, attrs=None, only_initial=False):
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"""
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Renders the field by rendering the passed widget, adding any HTML
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attributes passed as attrs. If no widget is specified, then the
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field's default widget will be used.
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"""
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if not widget:
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widget = 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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auto_id = self.auto_id
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if auto_id and 'id' not in attrs and 'id' not in widget.attrs:
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if not only_initial:
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attrs['id'] = auto_id
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else:
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attrs['id'] = self.html_initial_id
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if not only_initial:
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name = self.html_name
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else:
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name = self.html_initial_name
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return force_text(widget.render(name, self.value(), attrs=attrs))
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def as_text(self, attrs=None, **kwargs):
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"""
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Returns 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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"Returns 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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Returns 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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Returns the data for this BoundField, or None if it wasn't given.
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"""
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return self.field.widget.value_from_datadict(self.form.data, self.form.files, self.html_name)
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def value(self):
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"""
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Returns 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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if not self.form.is_bound:
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data = self.form.initial.get(self.name, self.field.initial)
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if callable(data):
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if self._initial_value is not UNSET:
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data = self._initial_value
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else:
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data = data()
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# If this is an auto-generated default date, nix the
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# microseconds for standardized handling. See #22502.
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if (isinstance(data, (datetime.datetime, datetime.time)) and
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not self.field.widget.supports_microseconds):
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data = data.replace(microsecond=0)
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self._initial_value = data
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else:
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data = self.field.bound_data(
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self.data, self.form.initial.get(self.name, self.field.initial)
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)
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return self.field.prepare_value(data)
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def label_tag(self, contents=None, attrs=None, label_suffix=None):
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"""
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Wraps 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, uses the field's HTML-escaped label.
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If attrs are given, they're used as HTML attributes on the <label> tag.
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label_suffix allows overriding 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 = dict(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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attrs = flatatt(attrs) if attrs else ''
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contents = format_html('<label{}>{}</label>', attrs, contents)
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else:
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contents = conditional_escape(contents)
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return mark_safe(contents)
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def css_classes(self, extra_classes=None):
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"""
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Returns 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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"Returns 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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Calculates and returns the ID attribute for this BoundField, if the
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associated Form has specified auto_id. Returns an empty string otherwise.
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"""
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auto_id = self.form.auto_id
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if auto_id and '%s' in smart_text(auto_id):
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return smart_text(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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def build_widget_attrs(self, attrs, widget=None):
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if not widget:
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widget = self.field.widget
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attrs = dict(attrs) # Copy attrs to avoid modifying the argument.
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if not widget.is_hidden and self.field.required and self.form.use_required_attribute:
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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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