app/django/forms/extras/widgets.py
author Mario Ferraro <fadinlight@gmail.com>
Sun, 15 Nov 2009 22:12:20 +0100
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permissions -rw-r--r--
GMaps related JS changed to use new google namespace. Google is going to change permanently in the future the way to load its services, so better stay safe. Also this commit shows uses of the new melange.js module. Fixes Issue 634.
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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)