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  • Documentation version: 1.8

Source code for django.forms.extras.widgets

Extra HTML Widget classes
from __future__ import unicode_literals

import datetime
import re

from django.conf import settings
from django.forms.widgets import Select, Widget
from django.utils import datetime_safe, six
from django.utils.dates import MONTHS
from django.utils.encoding import force_str
from django.utils.formats import get_format
from django.utils.safestring import mark_safe

__all__ = ('SelectDateWidget',)

RE_DATE = re.compile(r'(\d{4})-(\d\d?)-(\d\d?)$')

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'

[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' 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 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 else: match = RE_DATE.match(value) if match: year_val, month_val, day_val = [int(v) for v 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(six.iteritems(self.months)) 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 _parse_date_fmt(): output.append(html[field]) return mark_safe('\n'.join(output)) def id_for_label(self, id_): for first_select in _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, None) 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 = Select(choices=choices) select_html = s.render(field % name, val, local_attrs) return select_html
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