Implemented SelectMultiple in django.newforms.widgets
git-svn-id: http://code.djangoproject.com/svn/django/trunk@3958 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Adrian Holovaty
parent
964ccd1023
commit
36786d28f5
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@ -2,16 +2,26 @@
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HTML Widget classes
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"""
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__all__ = ('Widget', 'TextInput', 'PasswordInput', 'HiddenInput', 'FileInput', 'Textarea', 'CheckboxInput', 'Select')
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__all__ = (
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'Widget', 'TextInput', 'PasswordInput', 'HiddenInput', 'FileInput',
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'Textarea', 'CheckboxInput',
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'Select', 'SelectMultiple',
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)
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from django.utils.html import escape
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from itertools import chain
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try:
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set # Only available in Python 2.4+
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except NameError:
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from sets import Set as set # Python 2.3 fallback
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# Converts a dictionary to a single string with key="value", XML-style.
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# Assumes keys do not need to be XML-escaped.
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flatatt = lambda attrs: ' '.join(['%s="%s"' % (k, escape(v)) for k, v in attrs.items()])
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class Widget(object):
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requires_data_list = False # Determines whether render()'s 'value' argument should be a list.
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def __init__(self, attrs=None):
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self.attrs = attrs or {}
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@ -70,14 +80,31 @@ class Select(Widget):
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final_attrs.update(attrs)
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output = [u'<select %s>' % flatatt(final_attrs)]
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str_value = str(value) # Normalize to string.
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for option_value, option_label, in chain(self.choices, choices):
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for option_value, option_label in chain(self.choices, choices):
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selected_html = (str(option_value) == str_value) and ' selected="selected"' or ''
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output.append(u'<option value="%s"%s>%s</option>' % (escape(option_value), selected_html, escape(option_label)))
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output.append(u'</select>')
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return u'\n'.join(output)
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class SelectMultiple(Widget):
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pass
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requires_data_list = True
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def __init__(self, attrs=None, choices=()):
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# choices can be any iterable
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self.attrs = attrs or {}
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self.choices = choices
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def render(self, name, value, attrs=None, choices=()):
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if value is None: value = []
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final_attrs = dict(self.attrs, name=name)
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if attrs:
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final_attrs.update(attrs)
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output = [u'<select multiple="multiple" %s>' % flatatt(final_attrs)]
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str_values = set([str(v) for v in value]) # Normalize to strings.
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for option_value, option_label in chain(self.choices, choices):
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selected_html = (str(option_value) in str_values) and ' selected="selected"' or ''
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output.append(u'<option value="%s"%s>%s</option>' % (escape(option_value), selected_html, escape(option_label)))
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output.append(u'</select>')
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return u'\n'.join(output)
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class RadioSelect(Widget):
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pass
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@ -236,6 +236,110 @@ If 'choices' is passed to both the constructor and render(), then they'll both b
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<option value="5">5</option>
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</select>
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# SelectMultiple Widget #######################################################
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>>> w = SelectMultiple()
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>>> print w.render('beatles', ['J'], choices=(('J', 'John'), ('P', 'Paul'), ('G', 'George'), ('R', 'Ringo')))
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<select multiple="multiple" name="beatles">
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<option value="J" selected="selected">John</option>
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<option value="P">Paul</option>
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<option value="G">George</option>
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<option value="R">Ringo</option>
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</select>
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>>> print w.render('beatles', ['J', 'P'], choices=(('J', 'John'), ('P', 'Paul'), ('G', 'George'), ('R', 'Ringo')))
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<select multiple="multiple" name="beatles">
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<option value="J" selected="selected">John</option>
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<option value="P" selected="selected">Paul</option>
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<option value="G">George</option>
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<option value="R">Ringo</option>
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</select>
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>>> print w.render('beatles', ['J', 'P', 'R'], choices=(('J', 'John'), ('P', 'Paul'), ('G', 'George'), ('R', 'Ringo')))
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<select multiple="multiple" name="beatles">
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<option value="J" selected="selected">John</option>
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<option value="P" selected="selected">Paul</option>
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<option value="G">George</option>
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<option value="R" selected="selected">Ringo</option>
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</select>
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If the value is None, none of the options are selected:
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>>> print w.render('beatles', None, choices=(('J', 'John'), ('P', 'Paul'), ('G', 'George'), ('R', 'Ringo')))
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<select multiple="multiple" name="beatles">
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<option value="J">John</option>
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<option value="P">Paul</option>
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<option value="G">George</option>
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<option value="R">Ringo</option>
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</select>
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If the value corresponds to a label (but not to an option value), none of the options are selected:
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>>> print w.render('beatles', ['John'], choices=(('J', 'John'), ('P', 'Paul'), ('G', 'George'), ('R', 'Ringo')))
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<select multiple="multiple" name="beatles">
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<option value="J">John</option>
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<option value="P">Paul</option>
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<option value="G">George</option>
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<option value="R">Ringo</option>
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</select>
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If multiple values are given, but some of them are not valid, the valid ones are selected:
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>>> print w.render('beatles', ['J', 'G', 'foo'], choices=(('J', 'John'), ('P', 'Paul'), ('G', 'George'), ('R', 'Ringo')))
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<select multiple="multiple" name="beatles">
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<option value="J" selected="selected">John</option>
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<option value="P">Paul</option>
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<option value="G" selected="selected">George</option>
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<option value="R">Ringo</option>
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</select>
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The value is compared to its str():
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>>> print w.render('nums', [2], choices=[('1', '1'), ('2', '2'), ('3', '3')])
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<select multiple="multiple" name="nums">
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<option value="1">1</option>
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<option value="2" selected="selected">2</option>
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<option value="3">3</option>
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</select>
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>>> print w.render('nums', ['2'], choices=[(1, 1), (2, 2), (3, 3)])
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<select multiple="multiple" name="nums">
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<option value="1">1</option>
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<option value="2" selected="selected">2</option>
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<option value="3">3</option>
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</select>
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>>> print w.render('nums', [2], choices=[(1, 1), (2, 2), (3, 3)])
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<select multiple="multiple" name="nums">
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<option value="1">1</option>
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<option value="2" selected="selected">2</option>
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<option value="3">3</option>
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</select>
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The 'choices' argument can be any iterable:
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>>> def get_choices():
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... for i in range(5):
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... yield (i, i)
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>>> print w.render('nums', [2], choices=get_choices())
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<select multiple="multiple" name="nums">
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<option value="0">0</option>
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<option value="1">1</option>
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<option value="2" selected="selected">2</option>
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<option value="3">3</option>
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<option value="4">4</option>
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</select>
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You can also pass 'choices' to the constructor:
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>>> w = SelectMultiple(choices=[(1, 1), (2, 2), (3, 3)])
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>>> print w.render('nums', [2])
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<select multiple="multiple" name="nums">
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<option value="1">1</option>
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<option value="2" selected="selected">2</option>
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<option value="3">3</option>
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</select>
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If 'choices' is passed to both the constructor and render(), then they'll both be in the output:
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>>> print w.render('nums', [2], choices=[(4, 4), (5, 5)])
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<select multiple="multiple" name="nums">
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<option value="1">1</option>
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<option value="2" selected="selected">2</option>
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<option value="3">3</option>
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<option value="4">4</option>
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<option value="5">5</option>
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</select>
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# CharField ###################################################################
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>>> f = CharField(required=False)
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