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""" |
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Extra HTML Widget classes |
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""" |
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import time |
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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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from django.utils.formats import get_format |
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from django.conf import settings |
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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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none_value = (0, '---') |
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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, required=True): |
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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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self.required = required |
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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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if settings.USE_L10N: |
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try: |
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input_format = get_format('DATE_INPUT_FORMATS')[0] |
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# Python 2.4 compatibility: |
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# v = datetime.datetime.strptime(value, input_format) |
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# would be clearer, but datetime.strptime was added in |
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# Python 2.5 |
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v = datetime.datetime(*(time.strptime(value, input_format)[0:6])) |
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year_val, month_val, day_val = v.year, v.month, v.day |
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except ValueError: |
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pass |
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else: |
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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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choices = [(i, i) for i in self.years] |
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year_html = self.create_select(name, self.year_field, value, year_val, choices) |
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choices = MONTHS.items() |
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month_html = self.create_select(name, self.month_field, value, month_val, choices) |
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choices = [(i, i) for i in range(1, 32)] |
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day_html = self.create_select(name, self.day_field, value, day_val, choices) |
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format = get_format('DATE_FORMAT') |
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escaped = False |
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output = [] |
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for char in format: |
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if escaped: |
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escaped = False |
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elif char == '\\': |
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escaped = True |
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elif char in 'Yy': |
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output.append(year_html) |
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elif char in 'bFMmNn': |
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output.append(month_html) |
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elif char in 'dj': |
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output.append(day_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 = data.get(self.year_field % name) |
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m = data.get(self.month_field % name) |
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d = data.get(self.day_field % name) |
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if y == m == d == "0": |
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return None |
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if y and m and d: |
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if settings.USE_L10N: |
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input_format = get_format('DATE_INPUT_FORMATS')[0] |
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try: |
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date_value = datetime.date(int(y), int(m), int(d)) |
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except ValueError: |
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pass |
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else: |
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return date_value.strftime(input_format) |
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else: |
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return '%s-%s-%s' % (y, m, d) |
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return data.get(name, None) |
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def create_select(self, name, field, value, val, choices): |
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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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if not (self.required and val): |
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choices.insert(0, self.none_value) |
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local_attrs = self.build_attrs(id=field % id_) |
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s = Select(choices=choices) |
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select_html = s.render(field % name, val, local_attrs) |
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return select_html |
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