1059 lines
36 KiB
Python
1059 lines
36 KiB
Python
"""
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HTML Widget classes
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"""
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from __future__ import unicode_literals
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import copy
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import datetime
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import re
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from itertools import chain
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from django.conf import settings
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from django.forms.utils import flatatt, to_current_timezone
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from django.templatetags.static import static
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from django.utils import datetime_safe, formats, six
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from django.utils.datastructures import MultiValueDict
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from django.utils.dates import MONTHS
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from django.utils.deprecation import (
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RemovedInDjango20Warning, RenameMethodsBase,
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)
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from django.utils.encoding import (
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force_str, force_text, python_2_unicode_compatible,
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)
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from django.utils.formats import get_format
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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.six.moves import range
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from django.utils.translation import ugettext_lazy
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__all__ = (
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'Media', 'MediaDefiningClass', 'Widget', 'TextInput', 'NumberInput',
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'EmailInput', 'URLInput', 'PasswordInput', 'HiddenInput',
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'MultipleHiddenInput', 'FileInput', 'ClearableFileInput', 'Textarea',
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'DateInput', 'DateTimeInput', 'TimeInput', 'CheckboxInput', 'Select',
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'NullBooleanSelect', 'SelectMultiple', 'RadioSelect',
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'CheckboxSelectMultiple', 'MultiWidget', 'SplitDateTimeWidget',
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'SplitHiddenDateTimeWidget', 'SelectDateWidget',
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)
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MEDIA_TYPES = ('css', 'js')
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@html_safe
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@python_2_unicode_compatible
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class Media(object):
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def __init__(self, media=None, **kwargs):
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if media:
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media_attrs = media.__dict__
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else:
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media_attrs = kwargs
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self._css = {}
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self._js = []
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for name in MEDIA_TYPES:
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getattr(self, 'add_' + name)(media_attrs.get(name))
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def __str__(self):
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return self.render()
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def render(self):
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return mark_safe('\n'.join(chain(*[getattr(self, 'render_' + name)() for name in MEDIA_TYPES])))
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def render_js(self):
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return [
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format_html(
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'<script type="text/javascript" src="{}"></script>',
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self.absolute_path(path)
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) for path in self._js
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]
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def render_css(self):
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# To keep rendering order consistent, we can't just iterate over items().
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# We need to sort the keys, and iterate over the sorted list.
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media = sorted(self._css.keys())
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return chain(*[[
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format_html(
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'<link href="{}" type="text/css" media="{}" rel="stylesheet" />',
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self.absolute_path(path), medium
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) for path in self._css[medium]
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] for medium in media])
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def absolute_path(self, path):
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"""
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Given a relative or absolute path to a static asset, return an absolute
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path. An absolute path will be returned unchanged while a relative path
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will be passed to django.templatetags.static.static().
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"""
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if path.startswith(('http://', 'https://', '/')):
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return path
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return static(path)
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def __getitem__(self, name):
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"Returns a Media object that only contains media of the given type"
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if name in MEDIA_TYPES:
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return Media(**{str(name): getattr(self, '_' + name)})
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raise KeyError('Unknown media type "%s"' % name)
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def add_js(self, data):
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if data:
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for path in data:
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if path not in self._js:
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self._js.append(path)
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def add_css(self, data):
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if data:
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for medium, paths in data.items():
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for path in paths:
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if not self._css.get(medium) or path not in self._css[medium]:
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self._css.setdefault(medium, []).append(path)
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def __add__(self, other):
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combined = Media()
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for name in MEDIA_TYPES:
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getattr(combined, 'add_' + name)(getattr(self, '_' + name, None))
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getattr(combined, 'add_' + name)(getattr(other, '_' + name, None))
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return combined
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def media_property(cls):
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def _media(self):
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# Get the media property of the superclass, if it exists
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sup_cls = super(cls, self)
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try:
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base = sup_cls.media
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except AttributeError:
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base = Media()
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# Get the media definition for this class
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definition = getattr(cls, 'Media', None)
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if definition:
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extend = getattr(definition, 'extend', True)
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if extend:
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if extend is True:
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m = base
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else:
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m = Media()
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for medium in extend:
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m = m + base[medium]
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return m + Media(definition)
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else:
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return Media(definition)
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else:
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return base
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return property(_media)
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class MediaDefiningClass(type):
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"""
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Metaclass for classes that can have media definitions.
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"""
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def __new__(mcs, name, bases, attrs):
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new_class = super(MediaDefiningClass, mcs).__new__(mcs, name, bases, attrs)
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if 'media' not in attrs:
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new_class.media = media_property(new_class)
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return new_class
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@html_safe
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@python_2_unicode_compatible
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class SubWidget(object):
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"""
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Some widgets are made of multiple HTML elements -- namely, RadioSelect.
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This is a class that represents the "inner" HTML element of a widget.
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"""
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def __init__(self, parent_widget, name, value, attrs, choices):
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self.parent_widget = parent_widget
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self.name, self.value = name, value
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self.attrs, self.choices = attrs, choices
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def __str__(self):
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args = [self.name, self.value, self.attrs]
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if self.choices:
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args.append(self.choices)
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return self.parent_widget.render(*args)
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class RenameWidgetMethods(MediaDefiningClass, RenameMethodsBase):
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renamed_methods = (
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('_format_value', 'format_value', RemovedInDjango20Warning),
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)
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class Widget(six.with_metaclass(RenameWidgetMethods)):
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needs_multipart_form = False # Determines does this widget need multipart form
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is_localized = False
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is_required = False
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supports_microseconds = True
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def __init__(self, attrs=None):
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if attrs is not None:
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self.attrs = attrs.copy()
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else:
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self.attrs = {}
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def __deepcopy__(self, memo):
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obj = copy.copy(self)
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obj.attrs = self.attrs.copy()
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memo[id(self)] = obj
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return obj
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@property
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def is_hidden(self):
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return self.input_type == 'hidden' if hasattr(self, 'input_type') else False
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def subwidgets(self, name, value, attrs=None, choices=()):
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"""
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Yields all "subwidgets" of this widget. Used only by RadioSelect to
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allow template access to individual <input type="radio"> buttons.
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Arguments are the same as for render().
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"""
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yield SubWidget(self, name, value, attrs, choices)
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def render(self, name, value, attrs=None):
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"""
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Returns this Widget rendered as HTML, as a Unicode string.
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The 'value' given is not guaranteed to be valid input, so subclass
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implementations should program defensively.
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"""
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raise NotImplementedError('subclasses of Widget must provide a render() method')
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def build_attrs(self, extra_attrs=None, **kwargs):
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"Helper function for building an attribute dictionary."
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attrs = dict(self.attrs, **kwargs)
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if extra_attrs:
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attrs.update(extra_attrs)
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return attrs
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def value_from_datadict(self, data, files, name):
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"""
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Given a dictionary of data and this widget's name, returns the value
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of this widget. Returns None if it's not provided.
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"""
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return data.get(name)
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def id_for_label(self, id_):
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"""
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Returns the HTML ID attribute of this Widget for use by a <label>,
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given the ID of the field. Returns None if no ID is available.
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This hook is necessary because some widgets have multiple HTML
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elements and, thus, multiple IDs. In that case, this method should
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return an ID value that corresponds to the first ID in the widget's
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tags.
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"""
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return id_
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class Input(Widget):
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"""
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Base class for all <input> widgets (except type='checkbox' and
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type='radio', which are special).
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"""
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input_type = None # Subclasses must define this.
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def format_value(self, value):
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if self.is_localized:
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return formats.localize_input(value)
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return value
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def render(self, name, value, attrs=None):
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if value is None:
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value = ''
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final_attrs = self.build_attrs(attrs, type=self.input_type, name=name)
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if value != '':
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# Only add the 'value' attribute if a value is non-empty.
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final_attrs['value'] = force_text(self.format_value(value))
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return format_html('<input{} />', flatatt(final_attrs))
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class TextInput(Input):
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input_type = 'text'
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def __init__(self, attrs=None):
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if attrs is not None:
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self.input_type = attrs.pop('type', self.input_type)
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super(TextInput, self).__init__(attrs)
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class NumberInput(TextInput):
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input_type = 'number'
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class EmailInput(TextInput):
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input_type = 'email'
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class URLInput(TextInput):
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input_type = 'url'
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class PasswordInput(TextInput):
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input_type = 'password'
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def __init__(self, attrs=None, render_value=False):
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super(PasswordInput, self).__init__(attrs)
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self.render_value = render_value
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def render(self, name, value, attrs=None):
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if not self.render_value:
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value = None
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return super(PasswordInput, self).render(name, value, attrs)
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class HiddenInput(Input):
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input_type = 'hidden'
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class MultipleHiddenInput(HiddenInput):
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"""
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A widget that handles <input type="hidden"> for fields that have a list
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of values.
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"""
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def render(self, name, value, attrs=None):
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if value is None:
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value = []
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final_attrs = self.build_attrs(attrs, type=self.input_type, name=name)
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id_ = final_attrs.get('id')
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inputs = []
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for i, v in enumerate(value):
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input_attrs = dict(value=force_text(v), **final_attrs)
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if id_:
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# An ID attribute was given. Add a numeric index as a suffix
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# so that the inputs don't all have the same ID attribute.
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input_attrs['id'] = '%s_%s' % (id_, i)
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inputs.append(format_html('<input{} />', flatatt(input_attrs)))
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return mark_safe('\n'.join(inputs))
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def value_from_datadict(self, data, files, name):
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if isinstance(data, MultiValueDict):
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return data.getlist(name)
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return data.get(name)
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class FileInput(Input):
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input_type = 'file'
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needs_multipart_form = True
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def render(self, name, value, attrs=None):
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return super(FileInput, self).render(name, None, attrs=attrs)
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def value_from_datadict(self, data, files, name):
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"File widgets take data from FILES, not POST"
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return files.get(name)
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FILE_INPUT_CONTRADICTION = object()
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class ClearableFileInput(FileInput):
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initial_text = ugettext_lazy('Currently')
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input_text = ugettext_lazy('Change')
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clear_checkbox_label = ugettext_lazy('Clear')
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template_with_initial = (
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'%(initial_text)s: <a href="%(initial_url)s">%(initial)s</a> '
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'%(clear_template)s<br />%(input_text)s: %(input)s'
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)
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template_with_clear = '%(clear)s <label for="%(clear_checkbox_id)s">%(clear_checkbox_label)s</label>'
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def clear_checkbox_name(self, name):
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"""
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Given the name of the file input, return the name of the clear checkbox
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input.
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"""
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return name + '-clear'
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def clear_checkbox_id(self, name):
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"""
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Given the name of the clear checkbox input, return the HTML id for it.
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"""
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return name + '_id'
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def is_initial(self, value):
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"""
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Return whether value is considered to be initial value.
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"""
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return bool(value and getattr(value, 'url', False))
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def get_template_substitution_values(self, value):
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"""
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Return value-related substitutions.
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"""
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return {
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'initial': conditional_escape(value),
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'initial_url': conditional_escape(value.url),
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}
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def render(self, name, value, attrs=None):
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substitutions = {
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'initial_text': self.initial_text,
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'input_text': self.input_text,
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'clear_template': '',
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'clear_checkbox_label': self.clear_checkbox_label,
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}
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template = '%(input)s'
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substitutions['input'] = super(ClearableFileInput, self).render(name, value, attrs)
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if self.is_initial(value):
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template = self.template_with_initial
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substitutions.update(self.get_template_substitution_values(value))
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if not self.is_required:
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checkbox_name = self.clear_checkbox_name(name)
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checkbox_id = self.clear_checkbox_id(checkbox_name)
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substitutions['clear_checkbox_name'] = conditional_escape(checkbox_name)
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substitutions['clear_checkbox_id'] = conditional_escape(checkbox_id)
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substitutions['clear'] = CheckboxInput().render(checkbox_name, False, attrs={'id': checkbox_id})
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substitutions['clear_template'] = self.template_with_clear % substitutions
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return mark_safe(template % substitutions)
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def value_from_datadict(self, data, files, name):
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upload = super(ClearableFileInput, self).value_from_datadict(data, files, name)
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if not self.is_required and CheckboxInput().value_from_datadict(
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data, files, self.clear_checkbox_name(name)):
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if upload:
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# If the user contradicts themselves (uploads a new file AND
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# checks the "clear" checkbox), we return a unique marker
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# object that FileField will turn into a ValidationError.
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return FILE_INPUT_CONTRADICTION
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# False signals to clear any existing value, as opposed to just None
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return False
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return upload
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class Textarea(Widget):
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def __init__(self, attrs=None):
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# Use slightly better defaults than HTML's 20x2 box
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default_attrs = {'cols': '40', 'rows': '10'}
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if attrs:
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default_attrs.update(attrs)
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super(Textarea, self).__init__(default_attrs)
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def render(self, name, value, attrs=None):
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if value is None:
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value = ''
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final_attrs = self.build_attrs(attrs, name=name)
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return format_html('<textarea{}>\r\n{}</textarea>', flatatt(final_attrs), force_text(value))
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class DateTimeBaseInput(TextInput):
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format_key = ''
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supports_microseconds = False
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def __init__(self, attrs=None, format=None):
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super(DateTimeBaseInput, self).__init__(attrs)
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self.format = format if format else None
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def format_value(self, value):
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return formats.localize_input(value, self.format or formats.get_format(self.format_key)[0])
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class DateInput(DateTimeBaseInput):
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format_key = 'DATE_INPUT_FORMATS'
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class DateTimeInput(DateTimeBaseInput):
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format_key = 'DATETIME_INPUT_FORMATS'
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class TimeInput(DateTimeBaseInput):
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format_key = 'TIME_INPUT_FORMATS'
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|
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# Defined at module level so that CheckboxInput is picklable (#17976)
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def boolean_check(v):
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return not (v is False or v is None or v == '')
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class CheckboxInput(Widget):
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def __init__(self, attrs=None, check_test=None):
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super(CheckboxInput, self).__init__(attrs)
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# check_test is a callable that takes a value and returns True
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# if the checkbox should be checked for that value.
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self.check_test = boolean_check if check_test is None else check_test
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def render(self, name, value, attrs=None):
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final_attrs = self.build_attrs(attrs, type='checkbox', name=name)
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if self.check_test(value):
|
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final_attrs['checked'] = 'checked'
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if not (value is True or value is False or value is None or value == ''):
|
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# Only add the 'value' attribute if a value is non-empty.
|
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final_attrs['value'] = force_text(value)
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return format_html('<input{} />', flatatt(final_attrs))
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def value_from_datadict(self, data, files, name):
|
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if name not in data:
|
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# A missing value means False because HTML form submission does not
|
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# send results for unselected checkboxes.
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return False
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value = data.get(name)
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# Translate true and false strings to boolean values.
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values = {'true': True, 'false': False}
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if isinstance(value, six.string_types):
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value = values.get(value.lower(), value)
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return bool(value)
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|
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class Select(Widget):
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allow_multiple_selected = False
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def __init__(self, attrs=None, choices=()):
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super(Select, self).__init__(attrs)
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# choices can be any iterable, but we may need to render this widget
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# multiple times. Thus, collapse it into a list so it can be consumed
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# more than once.
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self.choices = list(choices)
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|
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def __deepcopy__(self, memo):
|
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obj = copy.copy(self)
|
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obj.attrs = self.attrs.copy()
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obj.choices = copy.copy(self.choices)
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memo[id(self)] = obj
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return obj
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def render(self, name, value, attrs=None):
|
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if value is None:
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value = ''
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final_attrs = self.build_attrs(attrs, name=name)
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output = [format_html('<select{}>', flatatt(final_attrs))]
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options = self.render_options([value])
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if options:
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output.append(options)
|
|
output.append('</select>')
|
|
return mark_safe('\n'.join(output))
|
|
|
|
def render_option(self, selected_choices, option_value, option_label):
|
|
if option_value is None:
|
|
option_value = ''
|
|
option_value = force_text(option_value)
|
|
if option_value in selected_choices:
|
|
selected_html = mark_safe(' selected="selected"')
|
|
if not self.allow_multiple_selected:
|
|
# Only allow for a single selection.
|
|
selected_choices.remove(option_value)
|
|
else:
|
|
selected_html = ''
|
|
return format_html('<option value="{}"{}>{}</option>', option_value, selected_html, force_text(option_label))
|
|
|
|
def render_options(self, selected_choices):
|
|
# Normalize to strings.
|
|
selected_choices = set(force_text(v) for v in selected_choices)
|
|
output = []
|
|
for option_value, option_label in self.choices:
|
|
if isinstance(option_label, (list, tuple)):
|
|
output.append(format_html('<optgroup label="{}">', force_text(option_value)))
|
|
for option in option_label:
|
|
output.append(self.render_option(selected_choices, *option))
|
|
output.append('</optgroup>')
|
|
else:
|
|
output.append(self.render_option(selected_choices, option_value, option_label))
|
|
return '\n'.join(output)
|
|
|
|
|
|
class NullBooleanSelect(Select):
|
|
"""
|
|
A Select Widget intended to be used with NullBooleanField.
|
|
"""
|
|
def __init__(self, attrs=None):
|
|
choices = (
|
|
('1', ugettext_lazy('Unknown')),
|
|
('2', ugettext_lazy('Yes')),
|
|
('3', ugettext_lazy('No')),
|
|
)
|
|
super(NullBooleanSelect, self).__init__(attrs, choices)
|
|
|
|
def render(self, name, value, attrs=None):
|
|
try:
|
|
value = {True: '2', False: '3', '2': '2', '3': '3'}[value]
|
|
except KeyError:
|
|
value = '1'
|
|
return super(NullBooleanSelect, self).render(name, value, attrs)
|
|
|
|
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)
|
|
|
|
|
|
class SelectMultiple(Select):
|
|
allow_multiple_selected = True
|
|
|
|
def render(self, name, value, attrs=None):
|
|
if value is None:
|
|
value = []
|
|
final_attrs = self.build_attrs(attrs, name=name)
|
|
output = [format_html('<select multiple="multiple"{}>', flatatt(final_attrs))]
|
|
options = self.render_options(value)
|
|
if options:
|
|
output.append(options)
|
|
output.append('</select>')
|
|
return mark_safe('\n'.join(output))
|
|
|
|
def value_from_datadict(self, data, files, name):
|
|
if isinstance(data, MultiValueDict):
|
|
return data.getlist(name)
|
|
return data.get(name)
|
|
|
|
|
|
@html_safe
|
|
@python_2_unicode_compatible
|
|
class ChoiceInput(SubWidget):
|
|
"""
|
|
An object used by ChoiceFieldRenderer that represents a single
|
|
<input type='$input_type'>.
|
|
"""
|
|
input_type = None # Subclasses must define this
|
|
|
|
def __init__(self, name, value, attrs, choice, index):
|
|
self.name = name
|
|
self.value = value
|
|
self.attrs = attrs
|
|
self.choice_value = force_text(choice[0])
|
|
self.choice_label = force_text(choice[1])
|
|
self.index = index
|
|
if 'id' in self.attrs:
|
|
self.attrs['id'] += "_%d" % self.index
|
|
|
|
def __str__(self):
|
|
return self.render()
|
|
|
|
def render(self, name=None, value=None, attrs=None):
|
|
if self.id_for_label:
|
|
label_for = format_html(' for="{}"', self.id_for_label)
|
|
else:
|
|
label_for = ''
|
|
attrs = dict(self.attrs, **attrs) if attrs else self.attrs
|
|
return format_html(
|
|
'<label{}>{} {}</label>', label_for, self.tag(attrs), self.choice_label
|
|
)
|
|
|
|
def is_checked(self):
|
|
return self.value == self.choice_value
|
|
|
|
def tag(self, attrs=None):
|
|
attrs = attrs or self.attrs
|
|
final_attrs = dict(attrs, type=self.input_type, name=self.name, value=self.choice_value)
|
|
if self.is_checked():
|
|
final_attrs['checked'] = 'checked'
|
|
return format_html('<input{} />', flatatt(final_attrs))
|
|
|
|
@property
|
|
def id_for_label(self):
|
|
return self.attrs.get('id', '')
|
|
|
|
|
|
class RadioChoiceInput(ChoiceInput):
|
|
input_type = 'radio'
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
super(RadioChoiceInput, self).__init__(*args, **kwargs)
|
|
self.value = force_text(self.value)
|
|
|
|
|
|
class CheckboxChoiceInput(ChoiceInput):
|
|
input_type = 'checkbox'
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
super(CheckboxChoiceInput, self).__init__(*args, **kwargs)
|
|
self.value = set(force_text(v) for v in self.value)
|
|
|
|
def is_checked(self):
|
|
return self.choice_value in self.value
|
|
|
|
|
|
@html_safe
|
|
@python_2_unicode_compatible
|
|
class ChoiceFieldRenderer(object):
|
|
"""
|
|
An object used by RadioSelect to enable customization of radio widgets.
|
|
"""
|
|
|
|
choice_input_class = None
|
|
outer_html = '<ul{id_attr}>{content}</ul>'
|
|
inner_html = '<li>{choice_value}{sub_widgets}</li>'
|
|
|
|
def __init__(self, name, value, attrs, choices):
|
|
self.name = name
|
|
self.value = value
|
|
self.attrs = attrs
|
|
self.choices = choices
|
|
|
|
def __getitem__(self, idx):
|
|
choice = list(self.choices)[idx] # Let the IndexError propagate
|
|
return self.choice_input_class(self.name, self.value, self.attrs.copy(), choice, idx)
|
|
|
|
def __str__(self):
|
|
return self.render()
|
|
|
|
def render(self):
|
|
"""
|
|
Outputs a <ul> for this set of choice fields.
|
|
If an id was given to the field, it is applied to the <ul> (each
|
|
item in the list will get an id of `$id_$i`).
|
|
"""
|
|
id_ = self.attrs.get('id')
|
|
output = []
|
|
for i, choice in enumerate(self.choices):
|
|
choice_value, choice_label = choice
|
|
if isinstance(choice_label, (tuple, list)):
|
|
attrs_plus = self.attrs.copy()
|
|
if id_:
|
|
attrs_plus['id'] += '_{}'.format(i)
|
|
sub_ul_renderer = self.__class__(
|
|
name=self.name,
|
|
value=self.value,
|
|
attrs=attrs_plus,
|
|
choices=choice_label,
|
|
)
|
|
sub_ul_renderer.choice_input_class = self.choice_input_class
|
|
output.append(format_html(
|
|
self.inner_html, choice_value=choice_value,
|
|
sub_widgets=sub_ul_renderer.render(),
|
|
))
|
|
else:
|
|
w = self.choice_input_class(self.name, self.value, self.attrs.copy(), choice, i)
|
|
output.append(format_html(self.inner_html, choice_value=force_text(w), sub_widgets=''))
|
|
return format_html(
|
|
self.outer_html,
|
|
id_attr=format_html(' id="{}"', id_) if id_ else '',
|
|
content=mark_safe('\n'.join(output)),
|
|
)
|
|
|
|
|
|
class RadioFieldRenderer(ChoiceFieldRenderer):
|
|
choice_input_class = RadioChoiceInput
|
|
|
|
|
|
class CheckboxFieldRenderer(ChoiceFieldRenderer):
|
|
choice_input_class = CheckboxChoiceInput
|
|
|
|
|
|
class RendererMixin(object):
|
|
renderer = None # subclasses must define this
|
|
_empty_value = None
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
# Override the default renderer if we were passed one.
|
|
renderer = kwargs.pop('renderer', None)
|
|
if renderer:
|
|
self.renderer = renderer
|
|
super(RendererMixin, self).__init__(*args, **kwargs)
|
|
|
|
def subwidgets(self, name, value, attrs=None):
|
|
for widget in self.get_renderer(name, value, attrs):
|
|
yield widget
|
|
|
|
def get_renderer(self, name, value, attrs=None):
|
|
"""Returns an instance of the renderer."""
|
|
if value is None:
|
|
value = self._empty_value
|
|
final_attrs = self.build_attrs(attrs)
|
|
return self.renderer(name, value, final_attrs, self.choices)
|
|
|
|
def render(self, name, value, attrs=None):
|
|
return self.get_renderer(name, value, attrs).render()
|
|
|
|
def id_for_label(self, id_):
|
|
# Widgets using this RendererMixin are made of a collection of
|
|
# subwidgets, each with their own <label>, and distinct ID.
|
|
# The IDs are made distinct by y "_X" suffix, where X is the zero-based
|
|
# index of the choice field. Thus, the label for the main widget should
|
|
# reference the first subwidget, hence the "_0" suffix.
|
|
if id_:
|
|
id_ += '_0'
|
|
return id_
|
|
|
|
|
|
class RadioSelect(RendererMixin, Select):
|
|
renderer = RadioFieldRenderer
|
|
_empty_value = ''
|
|
|
|
|
|
class CheckboxSelectMultiple(RendererMixin, SelectMultiple):
|
|
renderer = CheckboxFieldRenderer
|
|
_empty_value = []
|
|
|
|
def build_attrs(self, extra_attrs=None, **kwargs):
|
|
attrs = super(CheckboxSelectMultiple, self).build_attrs(extra_attrs, **kwargs)
|
|
# Remove the 'required' attribute because browser validation would
|
|
# require all checkboxes to be checked instead of at least one.
|
|
attrs.pop('required', None)
|
|
return attrs
|
|
|
|
|
|
class MultiWidget(Widget):
|
|
"""
|
|
A widget that is composed of multiple widgets.
|
|
|
|
Its render() method is different than other widgets', because it has to
|
|
figure out how to split a single value for display in multiple widgets.
|
|
The ``value`` argument can be one of two things:
|
|
|
|
* A list.
|
|
* A normal value (e.g., a string) that has been "compressed" from
|
|
a list of values.
|
|
|
|
In the second case -- i.e., if the value is NOT a list -- render() will
|
|
first "decompress" the value into a list before rendering it. It does so by
|
|
calling the decompress() method, which MultiWidget subclasses must
|
|
implement. This method takes a single "compressed" value and returns a
|
|
list.
|
|
|
|
When render() does its HTML rendering, each value in the list is rendered
|
|
with the corresponding widget -- the first value is rendered in the first
|
|
widget, the second value is rendered in the second widget, etc.
|
|
|
|
Subclasses may implement format_output(), which takes the list of rendered
|
|
widgets and returns a string of HTML that formats them any way you'd like.
|
|
|
|
You'll probably want to use this class with MultiValueField.
|
|
"""
|
|
def __init__(self, widgets, attrs=None):
|
|
self.widgets = [w() if isinstance(w, type) else w for w in widgets]
|
|
super(MultiWidget, self).__init__(attrs)
|
|
|
|
@property
|
|
def is_hidden(self):
|
|
return all(w.is_hidden for w in self.widgets)
|
|
|
|
def render(self, name, value, attrs=None):
|
|
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)
|
|
output = []
|
|
final_attrs = self.build_attrs(attrs)
|
|
id_ = final_attrs.get('id')
|
|
for i, widget in enumerate(self.widgets):
|
|
try:
|
|
widget_value = value[i]
|
|
except IndexError:
|
|
widget_value = None
|
|
if id_:
|
|
final_attrs = dict(final_attrs, id='%s_%s' % (id_, i))
|
|
output.append(widget.render(name + '_%s' % i, widget_value, final_attrs))
|
|
return mark_safe(self.format_output(output))
|
|
|
|
def id_for_label(self, id_):
|
|
# See the comment for RadioSelect.id_for_label()
|
|
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 format_output(self, rendered_widgets):
|
|
"""
|
|
Given a list of rendered widgets (as strings), returns a Unicode string
|
|
representing the HTML for the whole lot.
|
|
|
|
This hook allows you to format the HTML design of the widgets, if
|
|
needed.
|
|
"""
|
|
return ''.join(rendered_widgets)
|
|
|
|
def decompress(self, value):
|
|
"""
|
|
Returns 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(MultiWidget, self).__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)
|
|
|
|
|
|
class SplitDateTimeWidget(MultiWidget):
|
|
"""
|
|
A Widget that splits datetime input into two <input type="text"> boxes.
|
|
"""
|
|
supports_microseconds = False
|
|
|
|
def __init__(self, attrs=None, date_format=None, time_format=None):
|
|
widgets = (
|
|
DateInput(attrs=attrs, format=date_format),
|
|
TimeInput(attrs=attrs, format=time_format),
|
|
)
|
|
super(SplitDateTimeWidget, self).__init__(widgets, attrs)
|
|
|
|
def decompress(self, value):
|
|
if value:
|
|
value = to_current_timezone(value)
|
|
return [value.date(), value.time().replace(microsecond=0)]
|
|
return [None, None]
|
|
|
|
|
|
class SplitHiddenDateTimeWidget(SplitDateTimeWidget):
|
|
"""
|
|
A Widget that splits datetime input into two <input type="hidden"> inputs.
|
|
"""
|
|
def __init__(self, attrs=None, date_format=None, time_format=None):
|
|
super(SplitHiddenDateTimeWidget, self).__init__(attrs, date_format, time_format)
|
|
for widget in self.widgets:
|
|
widget.input_type = 'hidden'
|
|
|
|
|
|
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'
|
|
select_widget = Select
|
|
|
|
date_re = re.compile(r'(\d{4})-(\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
|
|
|
|
@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 render(self, name, value, attrs=None):
|
|
try:
|
|
year_val, month_val, day_val = value.year, value.month, value.day
|
|
except AttributeError:
|
|
year_val = month_val = day_val = None
|
|
if isinstance(value, six.string_types):
|
|
if settings.USE_L10N:
|
|
try:
|
|
input_format = get_format('DATE_INPUT_FORMATS')[0]
|
|
v = datetime.datetime.strptime(force_str(value), input_format)
|
|
year_val, month_val, day_val = v.year, v.month, v.day
|
|
except ValueError:
|
|
pass
|
|
if year_val is None:
|
|
match = self.date_re.match(value)
|
|
if match:
|
|
year_val, month_val, day_val = [int(val) for val in match.groups()]
|
|
html = {}
|
|
choices = [(i, i) for i in self.years]
|
|
html['year'] = self.create_select(name, self.year_field, value, year_val, choices, self.year_none_value)
|
|
choices = list(self.months.items())
|
|
html['month'] = self.create_select(name, self.month_field, value, month_val, choices, self.month_none_value)
|
|
choices = [(i, i) for i in range(1, 32)]
|
|
html['day'] = self.create_select(name, self.day_field, value, day_val, choices, self.day_none_value)
|
|
|
|
output = []
|
|
for field in self._parse_date_fmt():
|
|
output.append(html[field])
|
|
return mark_safe('\n'.join(output))
|
|
|
|
def id_for_label(self, id_):
|
|
for first_select in self._parse_date_fmt():
|
|
return '%s_%s' % (id_, first_select)
|
|
else:
|
|
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 create_select(self, name, field, value, val, choices, none_value):
|
|
if 'id' in self.attrs:
|
|
id_ = self.attrs['id']
|
|
else:
|
|
id_ = 'id_%s' % name
|
|
if not self.is_required:
|
|
choices.insert(0, none_value)
|
|
local_attrs = self.build_attrs(id=field % id_)
|
|
s = self.select_widget(choices=choices)
|
|
select_html = s.render(field % name, val, local_attrs)
|
|
return select_html
|