app/django/forms/extras/widgets.py
author Lennard de Rijk <ljvderijk@gmail.com>
Mon, 30 Mar 2009 21:16:18 +0000
changeset 2034 59de158c936d
parent 323 ff1a9aa48cfd
permissions -rw-r--r--
Fixed the duplicate slots view. The script would not clear the screen upon recalculation also the list of duplicates would increase with every iteration because the variables weren't properly reset. Patch by: Merio Ferraro, Lennard de Rijk Reviewed by: to-be-reviewed

"""
Extra HTML Widget classes
"""

import datetime
import re

from django.forms.widgets import Widget, Select
from django.utils.dates import MONTHS
from django.utils.safestring import mark_safe

__all__ = ('SelectDateWidget',)

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

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.
    """
    month_field = '%s_month'
    day_field = '%s_day'
    year_field = '%s_year'

    def __init__(self, attrs=None, years=None):
        # years is an optional list/tuple of years to use in the "year" select box.
        self.attrs = attrs or {}
        if years:
            self.years = years
        else:
            this_year = datetime.date.today().year
            self.years = range(this_year, this_year+10)

    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, basestring):
                match = RE_DATE.match(value)
                if match:
                    year_val, month_val, day_val = [int(v) for v in match.groups()]

        output = []

        if 'id' in self.attrs:
            id_ = self.attrs['id']
        else:
            id_ = 'id_%s' % name

        month_choices = MONTHS.items()
        month_choices.sort()
        local_attrs = self.build_attrs(id=self.month_field % id_)
        select_html = Select(choices=month_choices).render(self.month_field % name, month_val, local_attrs)
        output.append(select_html)

        day_choices = [(i, i) for i in range(1, 32)]
        local_attrs['id'] = self.day_field % id_
        select_html = Select(choices=day_choices).render(self.day_field % name, day_val, local_attrs)
        output.append(select_html)

        year_choices = [(i, i) for i in self.years]
        local_attrs['id'] = self.year_field % id_
        select_html = Select(choices=year_choices).render(self.year_field % name, year_val, local_attrs)
        output.append(select_html)

        return mark_safe(u'\n'.join(output))

    def id_for_label(self, id_):
        return '%s_month' % id_
    id_for_label = classmethod(id_for_label)

    def value_from_datadict(self, data, files, name):
        y, m, d = data.get(self.year_field % name), data.get(self.month_field % name), data.get(self.day_field % name)
        if y and m and d:
            return '%s-%s-%s' % (y, m, d)
        return data.get(name, None)