如何创建一个将自身呈现为一对输入的Django字段 字段?
推理:我正在尝试编写一个新的自定义字段。我会用它来做一个 类似验证码的服务。该服务通过提出问题来工作 - 然后接收一个和令牌。通过发送验证来进行验证 回答以及令牌。我想写一个表单字段 封装了这个逻辑。元素应该呈现(IMO)像
<input type="hidden" name="_token" value="1234567890" />
<input type="text" name="answer" />
在提交时,我需要_token
和answer
的值来验证答案。
答案 0 :(得分:9)
我认为你正在寻找MultiWidget,你可以简单地给它2个常规小工具,它会渲染组合。
答案 1 :(得分:4)
这里有一个现成的例子(取自我的博客):
class ComplexMultiWidget(forms.MultiWidget):
def __init__(self, attrs=None):
widgets = (
forms.TextInput(),
forms.SelectMultiple(choices=(('J', 'John'),
('P', 'Paul'),
('G', 'George'),
('R', 'Ringo'))),
forms.SplitDateTimeWidget(),
)
super(ComplexMultiWidget, self).__init__(widgets, attrs)
def decompress(self, value):
if value:
data = value.split(',')
return [data[0], data[1],
datetime.datetime(*time.strptime(data[2],
"%Y-%m-%d %H:%M:%S")[0:6])]
return [None, None, None]
def format_output(self, rendered_widgets):
return u'\n'.join(rendered_widgets)
class ComplexField(forms.MultiValueField):
def __init__(self, required=True, widget=None, label=None, initial=None):
fields = (
forms.CharField(),
forms.MultipleChoiceField(choices=(('J', 'John'),
('P', 'Paul'),
('G', 'George'),
('R', 'Ringo'))),
forms.SplitDateTimeField()
)
super(ComplexField, self).__init__(fields, required,
widget, label, initial)
def compress(self, data_list):
if data_list:
return '%s,%s,%s' % (data_list[0],''.join(data_list[1]),
data_list[2])
return None
示例使用方法:
>>> f = ComplexField(widget=ComplexMultiWidget())
>>> f.clean(['some text', ['J','P'], ['2007-04-25','6:24:00']])
u'some text,JP,2007-04-25 06:24:00'
>>> f.clean(['some text',['X'], ['2007-04-25','6:24:00']])
Traceback (most recent call last):
...
ValidationError: [u'Select a valid choice. X is not one of the available choices.']
>>> f.clean(['some text',['JP']])
Traceback (most recent call last):
>>> class ComplexFieldForm(Form):
field1 = ComplexField(widget=ComplexMultiWidget())
>>> f = ComplexFieldForm({'field1_0':'some text','field1_1':['J','P'], 'field1_2_0':'2007-04-25', 'field1_2_1':'06:24:00'})
>>> print f
<tr><th><label for="id_field1_0">Field1:</label></th><td><input type="text" name="field1_0" value="some text" id="id_field1_0" />
<select multiple="multiple" name="field1_1" id="id_field1_1">
<option value="J" selected="selected">John</option>
<option value="P" selected="selected">Paul</option>
<option value="G">George</option>
<option value="R">Ringo</option>
</select>
<input type="text" name="field1_2_0" value="2007-04-25" id="id_field1_2_0" /><input type="text" name="field1_2_1" value="06:24:00" id="id_field1_2_1" /></td></tr>
>>> f.cleaned_data
{'field1': u'some text,JP,2007-04-25 06:24:00'}
答案 2 :(得分:2)