44 lines
1.5 KiB
Python
44 lines
1.5 KiB
Python
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"""
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HTML Widget classes
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"""
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__all__ = ('Widget', 'TextInput', 'Textarea', 'CheckboxInput')
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from django.utils.html import escape
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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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def __init__(self, attrs=None):
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self.attrs = attrs or {}
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def render(self, name, value):
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raise NotImplementedError
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class TextInput(Widget):
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def render(self, name, value, attrs=None):
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if value is None: value = ''
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final_attrs = dict(self.attrs, type='text', name=name)
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if attrs:
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final_attrs.update(attrs)
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if value != '': final_attrs['value'] = value # Only add the 'value' attribute if a value is non-empty.
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return u'<input %s />' % flatatt(final_attrs)
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class Textarea(Widget):
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def render(self, name, value, attrs=None):
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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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return u'<textarea %s>%s</textarea>' % (flatatt(final_attrs), escape(value))
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class CheckboxInput(Widget):
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def render(self, name, value, attrs=None):
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final_attrs = dict(self.attrs, type='checkbox', name=name)
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if attrs:
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final_attrs.update(attrs)
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if value: final_attrs['checked'] = 'checked'
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return u'<input %s />' % flatatt(final_attrs)
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