app/django/forms/extras/widgets.py
author Lennard de Rijk <ljvderijk@gmail.com>
Thu, 30 Jul 2009 10:53:03 +0200
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"""
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Extra HTML Widget classes
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"""
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import datetime
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import re
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from django.forms.widgets import Widget, Select
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from django.utils.dates import MONTHS
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from django.utils.safestring import mark_safe
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__all__ = ('SelectDateWidget',)
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RE_DATE = re.compile(r'(\d{4})-(\d\d?)-(\d\d?)$')
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class SelectDateWidget(Widget):
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    """
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    A Widget that splits date input into three <select> boxes.
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    This also serves as an example of a Widget that has more than one HTML
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    element and hence implements value_from_datadict.
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    """
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    month_field = '%s_month'
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    day_field = '%s_day'
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    year_field = '%s_year'
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    def __init__(self, attrs=None, years=None):
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        # years is an optional list/tuple of years to use in the "year" select box.
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        self.attrs = attrs or {}
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        if years:
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            self.years = years
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        else:
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            this_year = datetime.date.today().year
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            self.years = range(this_year, this_year+10)
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    def render(self, name, value, attrs=None):
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        try:
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            year_val, month_val, day_val = value.year, value.month, value.day
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        except AttributeError:
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            year_val = month_val = day_val = None
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            if isinstance(value, basestring):
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                match = RE_DATE.match(value)
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                if match:
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                    year_val, month_val, day_val = [int(v) for v in match.groups()]
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        output = []
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        if 'id' in self.attrs:
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            id_ = self.attrs['id']
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        else:
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            id_ = 'id_%s' % name
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        month_choices = MONTHS.items()
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        month_choices.sort()
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        local_attrs = self.build_attrs(id=self.month_field % id_)
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        select_html = Select(choices=month_choices).render(self.month_field % name, month_val, local_attrs)
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        output.append(select_html)
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        day_choices = [(i, i) for i in range(1, 32)]
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        local_attrs['id'] = self.day_field % id_
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        select_html = Select(choices=day_choices).render(self.day_field % name, day_val, local_attrs)
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        output.append(select_html)
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        year_choices = [(i, i) for i in self.years]
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        local_attrs['id'] = self.year_field % id_
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        select_html = Select(choices=year_choices).render(self.year_field % name, year_val, local_attrs)
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        output.append(select_html)
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        return mark_safe(u'\n'.join(output))
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    def id_for_label(self, id_):
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        return '%s_month' % id_
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    id_for_label = classmethod(id_for_label)
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    def value_from_datadict(self, data, files, name):
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        y, m, d = data.get(self.year_field % name), data.get(self.month_field % name), data.get(self.day_field % name)
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        if y and m and d:
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            return '%s-%s-%s' % (y, m, d)
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        return data.get(name, None)