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"""
HTML Widget classes
"""
__all__ = ('Widget', 'TextInput', 'Textarea', 'CheckboxInput')
from django.utils.html import escape
# 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):
def __init__(self, attrs=None):
self.attrs = attrs or {}
def render(self, name, value):
raise NotImplementedError
class TextInput(Widget):
def render(self, name, value, attrs=None):
if value is None: value = ''
final_attrs = dict(self.attrs, type='text', 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 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)
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