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"""
HTML Widget classes
"""
__all__ = (
'Widget', 'TextInput', 'PasswordInput', 'HiddenInput', 'FileInput',
'Textarea', 'CheckboxInput',
'Select', 'SelectMultiple',
)
from django.utils.html import escape
from itertools import chain
try:
set # Only available in Python 2.4+
except NameError:
from sets import Set as set # Python 2.3 fallback
# Converts a dictionary to a single string with key="value", XML-style.
# Assumes keys do not need to be XML-escaped.
flatatt = lambda attrs: ' '.join(['%s="%s"' % (k, escape(v)) for k, v in attrs.items()])
class Widget(object):
requires_data_list = False # Determines whether render()'s 'value' argument should be a list.
def __init__(self, attrs=None):
self.attrs = attrs or {}
def render(self, name, value):
raise NotImplementedError
class Input(Widget):
"Base class for all <input> widgets (except type='checkbox', which is special)"
input_type = None # Subclasses must define this.
def render(self, name, value, attrs=None):
if value is None: value = ''
final_attrs = dict(self.attrs, type=self.input_type, name=name)
if attrs:
final_attrs.update(attrs)
if value != '': final_attrs['value'] = value # Only add the 'value' attribute if a value is non-empty.
return u'<input %s />' % flatatt(final_attrs)
class TextInput(Input):
input_type = 'text'
class PasswordInput(Input):
input_type = 'password'
class HiddenInput(Input):
input_type = 'hidden'
class FileInput(Input):
input_type = 'file'
class Textarea(Widget):
def render(self, name, value, attrs=None):
if value is None: value = ''
final_attrs = dict(self.attrs, name=name)
if attrs:
final_attrs.update(attrs)
return u'<textarea %s>%s</textarea>' % (flatatt(final_attrs), escape(value))
class CheckboxInput(Widget):
def render(self, name, value, attrs=None):
final_attrs = dict(self.attrs, type='checkbox', name=name)
if attrs:
final_attrs.update(attrs)
if value: final_attrs['checked'] = 'checked'
return u'<input %s />' % flatatt(final_attrs)
class Select(Widget):
def __init__(self, attrs=None, choices=()):
# choices can be any iterable
self.attrs = attrs or {}
self.choices = choices
def render(self, name, value, attrs=None, choices=()):
if value is None: value = ''
final_attrs = dict(self.attrs, name=name)
if attrs:
final_attrs.update(attrs)
output = [u'<select %s>' % flatatt(final_attrs)]
str_value = str(value) # Normalize to string.
for option_value, option_label in chain(self.choices, choices):
selected_html = (str(option_value) == str_value) and ' selected="selected"' or ''
output.append(u'<option value="%s"%s>%s</option>' % (escape(option_value), selected_html, escape(option_label)))
output.append(u'</select>')
return u'\n'.join(output)
class SelectMultiple(Widget):
requires_data_list = True
def __init__(self, attrs=None, choices=()):
# choices can be any iterable
self.attrs = attrs or {}
self.choices = choices
def render(self, name, value, attrs=None, choices=()):
if value is None: value = []
final_attrs = dict(self.attrs, name=name)
if attrs:
final_attrs.update(attrs)
output = [u'<select multiple="multiple" %s>' % flatatt(final_attrs)]
str_values = set([str(v) for v in value]) # Normalize to strings.
for option_value, option_label in chain(self.choices, choices):
selected_html = (str(option_value) in str_values) and ' selected="selected"' or ''
output.append(u'<option value="%s"%s>%s</option>' % (escape(option_value), selected_html, escape(option_label)))
output.append(u'</select>')
return u'\n'.join(output)
class RadioSelect(Widget):
pass
class CheckboxSelectMultiple(Widget):
pass
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