114 lines
3.9 KiB
Python
114 lines
3.9 KiB
Python
"""
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HTML Widget classes
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"""
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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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def render(self, name, value):
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raise NotImplementedError
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class Input(Widget):
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"Base class for all <input> widgets (except type='checkbox', which is special)"
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input_type = None # Subclasses must define this.
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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=self.input_type, 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 TextInput(Input):
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input_type = 'text'
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class PasswordInput(Input):
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input_type = 'password'
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class HiddenInput(Input):
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input_type = 'hidden'
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class FileInput(Input):
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input_type = 'file'
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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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class Select(Widget):
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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 %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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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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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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class CheckboxSelectMultiple(Widget):
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pass
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