• Language: en

Source code for django.forms.widgets

"""
HTML Widget classes
"""

import copy
import datetime
import re
import warnings
from itertools import chain

from django.conf import settings
from django.forms.utils import to_current_timezone
from django.templatetags.static import static
from django.utils import datetime_safe, formats
from django.utils.dates import MONTHS
from django.utils.formats import get_format
from django.utils.html import format_html, html_safe
from django.utils.safestring import mark_safe
from django.utils.translation import gettext_lazy as _

from .renderers import get_default_renderer

__all__ = (
    'Media', 'MediaDefiningClass', 'Widget', 'TextInput', 'NumberInput',
    'EmailInput', 'URLInput', 'PasswordInput', 'HiddenInput',
    'MultipleHiddenInput', 'FileInput', 'ClearableFileInput', 'Textarea',
    'DateInput', 'DateTimeInput', 'TimeInput', 'CheckboxInput', 'Select',
    'NullBooleanSelect', 'SelectMultiple', 'RadioSelect',
    'CheckboxSelectMultiple', 'MultiWidget', 'SplitDateTimeWidget',
    'SplitHiddenDateTimeWidget', 'SelectDateWidget',
)

MEDIA_TYPES = ('css', 'js')


class MediaOrderConflictWarning(RuntimeWarning):
    pass


@html_safe
class Media:
    def __init__(self, media=None, css=None, js=None):
        if media is not None:
            css = getattr(media, 'css', {})
            js = getattr(media, 'js', [])
        else:
            if css is None:
                css = {}
            if js is None:
                js = []
        self._css = css
        self._js = js

    def __repr__(self):
        return 'Media(css=%r, js=%r)' % (self._css, self._js)

    def __str__(self):
        return self.render()

    def render(self):
        return mark_safe('\n'.join(chain.from_iterable(getattr(self, 'render_' + name)() for name in MEDIA_TYPES)))

    def render_js(self):
        return [
            format_html(
                '<script type="text/javascript" src="{}"></script>',
                self.absolute_path(path)
            ) for path in self._js
        ]

    def render_css(self):
        # To keep rendering order consistent, we can't just iterate over items().
        # We need to sort the keys, and iterate over the sorted list.
        media = sorted(self._css)
        return chain.from_iterable([
            format_html(
                '<link href="{}" type="text/css" media="{}" rel="stylesheet" />',
                self.absolute_path(path), medium
            ) for path in self._css[medium]
        ] for medium in media)

    def absolute_path(self, path):
        """
        Given a relative or absolute path to a static asset, return an absolute
        path. An absolute path will be returned unchanged while a relative path
        will be passed to django.templatetags.static.static().
        """
        if path.startswith(('http://', 'https://', '/')):
            return path
        return static(path)

    def __getitem__(self, name):
        """Return a Media object that only contains media of the given type."""
        if name in MEDIA_TYPES:
            return Media(**{str(name): getattr(self, '_' + name)})
        raise KeyError('Unknown media type "%s"' % name)

    @staticmethod
    def merge(list_1, list_2):
        """
        Merge two lists while trying to keep the relative order of the elements.
        Warn if the lists have the same two elements in a different relative
        order.

        For static assets it can be important to have them included in the DOM
        in a certain order. In JavaScript you may not be able to reference a
        global or in CSS you might want to override a style.
        """
        # Start with a copy of list_1.
        combined_list = list(list_1)
        last_insert_index = len(list_1)
        # Walk list_2 in reverse, inserting each element into combined_list if
        # it doesn't already exist.
        for path in reversed(list_2):
            try:
                # Does path already exist in the list?
                index = combined_list.index(path)
            except ValueError:
                # Add path to combined_list since it doesn't exist.
                combined_list.insert(last_insert_index, path)
            else:
                if index > last_insert_index:
                    warnings.warn(
                        'Detected duplicate Media files in an opposite order:\n'
                        '%s\n%s' % (combined_list[last_insert_index], combined_list[index]),
                        MediaOrderConflictWarning,
                    )
                # path already exists in the list. Update last_insert_index so
                # that the following elements are inserted in front of this one.
                last_insert_index = index
        return combined_list

    def __add__(self, other):
        combined = Media()
        combined._js = self.merge(self._js, other._js)
        combined._css = {
            medium: self.merge(self._css.get(medium, []), other._css.get(medium, []))
            for medium in self._css.keys() | other._css.keys()
        }
        return combined


def media_property(cls):
    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)
            else:
                return Media(definition)
        else:
            return base
    return property(_media)


class MediaDefiningClass(type):
    """
    Metaclass for classes that can have media definitions.
    """
    def __new__(mcs, name, bases, attrs):
        new_class = super(MediaDefiningClass, mcs).__new__(mcs, name, bases, attrs)

        if 'media' not in attrs:
            new_class.media = media_property(new_class)

        return new_class


[docs]class Widget(metaclass=MediaDefiningClass): needs_multipart_form = False # Determines does this widget need multipart form is_localized = False is_required = False supports_microseconds = True def __init__(self, attrs=None): if attrs is not None: self.attrs = attrs.copy() else: self.attrs = {} def __deepcopy__(self, memo): obj = copy.copy(self) obj.attrs = self.attrs.copy() memo[id(self)] = obj return obj @property def is_hidden(self): return self.input_type == 'hidden' if hasattr(self, 'input_type') else False def subwidgets(self, name, value, attrs=None): context = self.get_context(name, value, attrs) yield context['widget']
[docs] 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)
[docs] 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
[docs] 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 _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): """Build an attribute dictionary.""" attrs = base_attrs.copy() if extra_attrs is not None: attrs.update(extra_attrs) return attrs
[docs] 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)
[docs] def value_omitted_from_data(self, data, files, name): return name not in data
[docs] 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_
[docs] def use_required_attribute(self, initial): return not self.is_hidden
class Input(Widget): """ Base class for all <input> widgets. """ input_type = None # Subclasses must define this. template_name = 'django/forms/widgets/input.html' def __init__(self, attrs=None): if attrs is not None: attrs = attrs.copy() self.input_type = attrs.pop('type', self.input_type) super().__init__(attrs) def get_context(self, name, value, attrs): context = super().get_context(name, value, attrs) context['widget']['type'] = self.input_type return context
[docs]class TextInput(Input): input_type = 'text' template_name = 'django/forms/widgets/text.html'
[docs]class NumberInput(Input): input_type = 'number' template_name = 'django/forms/widgets/number.html'
[docs]class EmailInput(Input): input_type = 'email' template_name = 'django/forms/widgets/email.html'
[docs]class URLInput(Input): input_type = 'url' template_name = 'django/forms/widgets/url.html'
[docs]class PasswordInput(Input): input_type = 'password' template_name = 'django/forms/widgets/password.html' def __init__(self, attrs=None, render_value=False): super().__init__(attrs) self.render_value = render_value def get_context(self, name, value, attrs): if not self.render_value: value = None return super().get_context(name, value, attrs)
[docs]class HiddenInput(Input): input_type = 'hidden' template_name = 'django/forms/widgets/hidden.html'
[docs]class MultipleHiddenInput(HiddenInput): """ Handle <input type="hidden"> for fields that have a list of values. """ template_name = 'django/forms/widgets/multiple_hidden.html' def get_context(self, name, value, attrs): context = super().get_context(name, value, attrs) final_attrs = context['widget']['attrs'] id_ = context['widget']['attrs'].get('id') subwidgets = [] for index, value_ in enumerate(context['widget']['value']): widget_attrs = final_attrs.copy() if id_: # An ID attribute was given. Add a numeric index as a suffix # so that the inputs don't all have the same ID attribute. widget_attrs['id'] = '%s_%s' % (id_, index) widget = HiddenInput() widget.is_required = self.is_required subwidgets.append(widget.get_context(name, value_, widget_attrs)['widget']) context['widget']['subwidgets'] = subwidgets return context def value_from_datadict(self, data, files, name): try: getter = data.getlist except AttributeError: getter = data.get return getter(name) def format_value(self, value): return [] if value is None else value
[docs]class FileInput(Input): input_type = 'file' needs_multipart_form = True template_name = 'django/forms/widgets/file.html' def format_value(self, value): """File input never renders a value.""" return def value_from_datadict(self, data, files, name): "File widgets take data from FILES, not POST" return files.get(name) def value_omitted_from_data(self, data, files, name): return name not in files
FILE_INPUT_CONTRADICTION = object()
[docs]class ClearableFileInput(FileInput): clear_checkbox_label = _('Clear') initial_text = _('Currently') input_text = _('Change') template_name = 'django/forms/widgets/clearable_file_input.html' def clear_checkbox_name(self, name): """ Given the name of the file input, return the name of the clear checkbox input. """ return name + '-clear' def clear_checkbox_id(self, name): """ Given the name of the clear checkbox input, return the HTML id for it. """ return name + '_id' def is_initial(self, value): """ Return whether value is considered to be initial value. """ return bool(value and getattr(value, 'url', False)) def format_value(self, value): """ Return the file object if it has a defined url attribute. """ if self.is_initial(value): return value def get_context(self, name, value, attrs): context = super().get_context(name, value, attrs) checkbox_name = self.clear_checkbox_name(name) checkbox_id = self.clear_checkbox_id(checkbox_name) context['widget'].update({ 'checkbox_name': checkbox_name, 'checkbox_id': checkbox_id, 'is_initial': self.is_initial(value), 'input_text': self.input_text, 'initial_text': self.initial_text, 'clear_checkbox_label': self.clear_checkbox_label, }) return context def value_from_datadict(self, data, files, name): upload = super().value_from_datadict(data, files, name) if not self.is_required and CheckboxInput().value_from_datadict( data, files, self.clear_checkbox_name(name)): if upload: # If the user contradicts themselves (uploads a new file AND # checks the "clear" checkbox), we return a unique marker # object that FileField will turn into a ValidationError. return FILE_INPUT_CONTRADICTION # False signals to clear any existing value, as opposed to just None return False return upload def use_required_attribute(self, initial): return super().use_required_attribute(initial) and not initial def value_omitted_from_data(self, data, files, name): return ( super().value_omitted_from_data(data, files, name) and self.clear_checkbox_name(name) not in data )
[docs]class Textarea(Widget): template_name = 'django/forms/widgets/textarea.html' def __init__(self, attrs=None): # Use slightly better defaults than HTML's 20x2 box default_attrs = {'cols': '40', 'rows': '10'} if attrs: default_attrs.update(attrs) super().__init__(default_attrs)
class DateTimeBaseInput(TextInput): format_key = '' supports_microseconds = False def __init__(self, attrs=None, format=None): super().__init__(attrs) self.format = format if format else None def format_value(self, value): return formats.localize_input(value, self.format or formats.get_format(self.format_key)[0])
[docs]class DateInput(DateTimeBaseInput): format_key = 'DATE_INPUT_FORMATS' template_name = 'django/forms/widgets/date.html'
[docs]class DateTimeInput(DateTimeBaseInput): format_key = 'DATETIME_INPUT_FORMATS' template_name = 'django/forms/widgets/datetime.html'
[docs]class TimeInput(DateTimeBaseInput): format_key = 'TIME_INPUT_FORMATS' template_name = 'django/forms/widgets/time.html'
# Defined at module level so that CheckboxInput is picklable (#17976) def boolean_check(v): return not (v is False or v is None or v == '')
[docs]class CheckboxInput(Input): input_type = 'checkbox' template_name = 'django/forms/widgets/checkbox.html' def __init__(self, attrs=None, check_test=None): super().__init__(attrs) # check_test is a callable that takes a value and returns True # if the checkbox should be checked for that value. self.check_test = boolean_check if check_test is None else check_test def format_value(self, value): """Only return the 'value' attribute if value isn't empty.""" if value is True or value is False or value is None or value == '': return return str(value) def get_context(self, name, value, attrs): if self.check_test(value): if attrs is None: attrs = {} attrs['checked'] = True return super().get_context(name, value, attrs) def value_from_datadict(self, data, files, name): if name not in data: # A missing value means False because HTML form submission does not # send results for unselected checkboxes. return False value = data.get(name) # Translate true and false strings to boolean values. values = {'true': True, 'false': False} if isinstance(value, str): value = values.get(value.lower(), value) return bool(value) def value_omitted_from_data(self, data, files, name): # HTML checkboxes don't appear in POST data if not checked, so it's # never known if the value is actually omitted. return False
class ChoiceWidget(Widget): allow_multiple_selected = False input_type = None template_name = None option_template_name = None add_id_index = True checked_attribute = {'checked': True} option_inherits_attrs = True def __init__(self, attrs=None, choices=()): super().__init__(attrs) # choices can be any iterable, but we may need to render this widget # multiple times. Thus, collapse it into a list so it can be consumed # more than once. self.choices = list(choices) def __deepcopy__(self, memo): obj = copy.copy(self) obj.attrs = self.attrs.copy() obj.choices = copy.copy(self.choices) memo[id(self)] = obj return obj 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) 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 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) ) if selected and not has_selected: has_selected = True subgroup.append(self.create_option( name, subvalue, sublabel, selected, index, subindex=subindex, attrs=attrs, )) if subindex is not None: subindex += 1 return groups 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, } def get_context(self, name, value, attrs): context = super().get_context(name, value, attrs) context['widget']['optgroups'] = self.optgroups(name, context['widget']['value'], attrs) context['wrap_label'] = True return context 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_ 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) def format_value(self, value): """Return selected values as a list.""" if not isinstance(value, (tuple, list)): value = [value] return [str(v) if v is not None else '' for v in value]
[docs]class Select(ChoiceWidget): input_type = 'select' template_name = 'django/forms/widgets/select.html' option_template_name = 'django/forms/widgets/select_option.html' add_id_index = False checked_attribute = {'selected': True} option_inherits_attrs = False def get_context(self, name, value, attrs): context = super().get_context(name, value, attrs) if self.allow_multiple_selected: context['widget']['attrs']['multiple'] = 'multiple' return context @staticmethod def _choice_has_empty_value(choice): """Return True if the choice's value is empty string or None.""" value, _ = choice return (isinstance(value, str) and not bool(value)) or value is None 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)
[docs]class NullBooleanSelect(Select): """ A Select Widget intended to be used with NullBooleanField. """ def __init__(self, attrs=None): choices = ( ('1', _('Unknown')), ('2', _('Yes')), ('3', _('No')), ) super().__init__(attrs, choices) def format_value(self, value): try: return {True: '2', False: '3', '2': '2', '3': '3'}[value] except KeyError: return '1' def value_from_datadict(self, data, files, name): value = data.get(name) return { '2': True, True: True, 'True': True, '3': False, 'False': False, False: False, }.get(value)
[docs]class SelectMultiple(Select): allow_multiple_selected = True def value_from_datadict(self, data, files, name): try: getter = data.getlist except AttributeError: getter = data.get return getter(name) def value_omitted_from_data(self, data, files, name): # An unselected <select multiple> doesn't appear in POST data, so it's # never known if the value is actually omitted. return False
[docs]class RadioSelect(ChoiceWidget): input_type = 'radio' template_name = 'django/forms/widgets/radio.html' option_template_name = 'django/forms/widgets/radio_option.html'
[docs]class CheckboxSelectMultiple(ChoiceWidget): allow_multiple_selected = True input_type = 'checkbox' template_name = 'django/forms/widgets/checkbox_select.html' option_template_name = 'django/forms/widgets/checkbox_option.html' def use_required_attribute(self, initial): # Don't use the 'required' attribute because browser validation would # require all checkboxes to be checked instead of at least one. return False def value_omitted_from_data(self, data, files, name): # HTML checkboxes don't appear in POST data if not checked, so it's # never known if the value is actually omitted. return False def id_for_label(self, id_, index=None): """" Don't include for="field_0" in <label> because clicking such a label would toggle the first checkbox. """ if index is None: return '' return super().id_for_label(id_, index)
[docs]class MultiWidget(Widget): """ A widget that is composed of multiple widgets. In addition to the values added by Widget.get_context(), this widget adds a list of subwidgets to the context as widget['subwidgets']. These can be looped over and rendered like normal widgets. You'll probably want to use this class with MultiValueField. """ template_name = 'django/forms/widgets/multiwidget.html' def __init__(self, widgets, attrs=None): self.widgets = [w() if isinstance(w, type) else w for w in widgets] super().__init__(attrs) @property def is_hidden(self): return all(w.is_hidden for w in self.widgets)
[docs] def get_context(self, name, value, attrs): context = super().get_context(name, value, attrs) if self.is_localized: for widget in self.widgets: widget.is_localized = self.is_localized # value is a list of values, each corresponding to a widget # in self.widgets. if not isinstance(value, list): value = self.decompress(value) final_attrs = context['widget']['attrs'] input_type = final_attrs.pop('type', None) id_ = final_attrs.get('id') subwidgets = [] for i, widget in enumerate(self.widgets): if input_type is not None: widget.input_type = input_type widget_name = '%s_%s' % (name, i) try: widget_value = value[i] except IndexError: widget_value = None if id_: widget_attrs = final_attrs.copy() widget_attrs['id'] = '%s_%s' % (id_, i) else: widget_attrs = final_attrs subwidgets.append(widget.get_context(widget_name, widget_value, widget_attrs)['widget']) context['widget']['subwidgets'] = subwidgets return context
def id_for_label(self, id_): if id_: id_ += '_0' return id_ def value_from_datadict(self, data, files, name): return [widget.value_from_datadict(data, files, name + '_%s' % i) for i, widget in enumerate(self.widgets)] def value_omitted_from_data(self, data, files, name): return all( widget.value_omitted_from_data(data, files, name + '_%s' % i) for i, widget in enumerate(self.widgets) )
[docs] def decompress(self, value): """ Return a list of decompressed values for the given compressed value. The given value can be assumed to be valid, but not necessarily non-empty. """ raise NotImplementedError('Subclasses must implement this method.')
def _get_media(self): """ Media for a multiwidget is the combination of all media of the subwidgets. """ media = Media() for w in self.widgets: media = media + w.media return media media = property(_get_media) def __deepcopy__(self, memo): obj = super().__deepcopy__(memo) obj.widgets = copy.deepcopy(self.widgets) return obj @property def needs_multipart_form(self): return any(w.needs_multipart_form for w in self.widgets)
[docs]class SplitDateTimeWidget(MultiWidget): """ A widget that splits datetime input into two <input type="text"> boxes. """ supports_microseconds = False template_name = 'django/forms/widgets/splitdatetime.html' def __init__(self, attrs=None, date_format=None, time_format=None, date_attrs=None, time_attrs=None): widgets = ( DateInput( attrs=attrs if date_attrs is None else date_attrs, format=date_format, ), TimeInput( attrs=attrs if time_attrs is None else time_attrs, format=time_format, ), ) super().__init__(widgets) def decompress(self, value): if value: value = to_current_timezone(value) return [value.date(), value.time().replace(microsecond=0)] return [None, None]
[docs]class SplitHiddenDateTimeWidget(SplitDateTimeWidget): """ A widget that splits datetime input into two <input type="hidden"> inputs. """ template_name = 'django/forms/widgets/splithiddendatetime.html' def __init__(self, attrs=None, date_format=None, time_format=None, date_attrs=None, time_attrs=None): super().__init__(attrs, date_format, time_format, date_attrs, time_attrs) for widget in self.widgets: widget.input_type = 'hidden'
[docs]class SelectDateWidget(Widget): """ A widget that splits date input into three <select> boxes. This also serves as an example of a Widget that has more than one HTML element and hence implements value_from_datadict. """ none_value = (0, '---') month_field = '%s_month' day_field = '%s_day' year_field = '%s_year' template_name = 'django/forms/widgets/select_date.html' input_type = 'select' select_widget = Select date_re = re.compile(r'(\d{4}|0)-(\d\d?)-(\d\d?)$') def __init__(self, attrs=None, years=None, months=None, empty_label=None): self.attrs = attrs or {} # Optional list or tuple of years to use in the "year" select box. if years: self.years = years else: this_year = datetime.date.today().year self.years = range(this_year, this_year + 10) # Optional dict of months to use in the "month" select box. if months: self.months = months else: self.months = MONTHS # Optional string, list, or tuple to use as empty_label. if isinstance(empty_label, (list, tuple)): if not len(empty_label) == 3: raise ValueError('empty_label list/tuple must have 3 elements.') self.year_none_value = (0, empty_label[0]) self.month_none_value = (0, empty_label[1]) self.day_none_value = (0, empty_label[2]) else: if empty_label is not None: self.none_value = (0, empty_label) self.year_none_value = self.none_value self.month_none_value = self.none_value self.day_none_value = self.none_value def get_context(self, name, value, attrs): context = super().get_context(name, value, attrs) date_context = {} year_choices = [(i, str(i)) for i in self.years] if not self.is_required: year_choices.insert(0, self.year_none_value) year_attrs = context['widget']['attrs'].copy() year_name = self.year_field % name year_attrs['id'] = 'id_%s' % year_name date_context['year'] = self.select_widget(attrs, choices=year_choices).get_context( name=year_name, value=context['widget']['value']['year'], attrs=year_attrs, ) month_choices = list(self.months.items()) if not self.is_required: month_choices.insert(0, self.month_none_value) month_attrs = context['widget']['attrs'].copy() month_name = self.month_field % name month_attrs['id'] = 'id_%s' % month_name date_context['month'] = self.select_widget(attrs, choices=month_choices).get_context( name=month_name, value=context['widget']['value']['month'], attrs=month_attrs, ) day_choices = [(i, i) for i in range(1, 32)] if not self.is_required: day_choices.insert(0, self.day_none_value) day_attrs = context['widget']['attrs'].copy() day_name = self.day_field % name day_attrs['id'] = 'id_%s' % day_name date_context['day'] = self.select_widget(attrs, choices=day_choices,).get_context( name=day_name, value=context['widget']['value']['day'], attrs=day_attrs, ) subwidgets = [] for field in self._parse_date_fmt(): subwidgets.append(date_context[field]['widget']) context['widget']['subwidgets'] = subwidgets return context def format_value(self, value): """ Return a dict containing the year, month, and day of the current value. Use dict instead of a datetime to allow invalid dates such as February 31 to display correctly. """ year, month, day = None, None, None if isinstance(value, (datetime.date, datetime.datetime)): year, month, day = value.year, value.month, value.day elif isinstance(value, str): if settings.USE_L10N: input_format = get_format('DATE_INPUT_FORMATS')[0] try: d = datetime.datetime.strptime(value, input_format) except ValueError: pass else: year, month, day = d.year, d.month, d.day match = self.date_re.match(value) if match: year, month, day = [int(val) for val in match.groups()] return {'year': year, 'month': month, 'day': day} @staticmethod def _parse_date_fmt(): fmt = get_format('DATE_FORMAT') escaped = False for char in fmt: if escaped: escaped = False elif char == '\\': escaped = True elif char in 'Yy': yield 'year' elif char in 'bEFMmNn': yield 'month' elif char in 'dj': yield 'day' def id_for_label(self, id_): for first_select in self._parse_date_fmt(): return '%s_%s' % (id_, first_select) return '%s_month' % id_ def value_from_datadict(self, data, files, name): y = data.get(self.year_field % name) m = data.get(self.month_field % name) d = data.get(self.day_field % name) if y == m == d == "0": return None if y and m and d: if settings.USE_L10N: input_format = get_format('DATE_INPUT_FORMATS')[0] try: date_value = datetime.date(int(y), int(m), int(d)) except ValueError: return '%s-%s-%s' % (y, m, d) else: date_value = datetime_safe.new_date(date_value) return date_value.strftime(input_format) else: return '%s-%s-%s' % (y, m, d) return data.get(name) def value_omitted_from_data(self, data, files, name): return not any( ('{}_{}'.format(name, interval) in data) for interval in ('year', 'month', 'day') )
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