Django：如何将参数传递给表单 [英] Django: how to pass parameters to forms

问题描述

我有一个用bootstrap3呈现的Django表单。我希望能够将参数传递到表单中以使其更通用。我的表格如下：

I have a Django form that is rendered with bootstrap3. I want to be able to pass parameters into my form to make it more generic. My forms looks like:

class SpacecraftID(forms.Form):
  def __init__(self,*args,**kwargs):
    choices = kwargs.pop('choices')
    #self.choices = kwargs.pop('choices') produces same error
    super(SpacecraftID,self).__init__(*args,**kwargs)

  scID = forms.MultipleChoiceField(required=False, widget=forms.CheckboxSelectMultiple, choices=choices)

我的视图如下：

def schedule_search(request):
 choices = (
    ('1','SAT1'),
    ('2','SAT2'),
    ('3','SAT3'),
    )

 if request.method == 'POST':
    form_ID = SpacecraftID(request.POST,choices=choices)
    if form.is_valid():
        scID = form_ID.cleaned_data['scID']

 else:
    form_ID = SpacecraftID(choices=choices)

 return render(request, 'InterfaceApp/schedule_search.html', {'form3': form_ID})

当我r取消此代码，我收到错误消息：

When I run this code I get the error:

/ InterfaceApp / schedule_search /处的NameError，未定义
名称选择

NameError at /InterfaceApp/schedule_search/, name 'choices' is not defined

推荐答案

问题是定义表单字段时，即 choices 变量不可用。 Python解析 forms.py 文件，该文件仅在实例化表单时在 __ init __ 中可用。然后，您需要更新 __ init __ 中的字段。

The problem is that the choices variable is not available when you define your form fields, that is when Python parse the forms.py file, it is only available when the form is instantiated, inside __init__. You then need to update the field inside __init__.

class SpacecraftID(forms.Form):
    def __init__(self,*args,**kwargs):
        choices = kwargs.pop('choices')

        super(SpacecraftID,self).__init__(*args,**kwargs)

        # Set choices from argument.
        self.fields['scId'].choices = choices

    # Set choices to an empty list as it is a required argument.
    scID = forms.MultipleChoiceField(required=False, widget=forms.CheckboxSelectMultiple, choices=[])

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