根据视图中的条件更改表单中的必填字段（Django）

Question

我有一个表单，LabelingForm() 有两个多选字段，我希望设置所需的 - 参数，以便在按下按钮 A 和 B 时它为 False，但在按下按钮 C 时为 True。我已经尝试使用 initial = False 和 required = True 但它不起作用，按下按钮 A 时需要字段选择。

在forms.py

class LabelingForm(forms.Form):



    First_choices = (('1',''),

             .....
            )

    First_choice = forms.MultipleChoiceField(choices=First_choices, initial=True,required=True)


    Second__choices = (('1',''),

      .....
            )

   Second_choice = forms.MultipleChoiceField(choices=Second_choices, initial=True,required=True)

在views.py

def function(request, postID):
       if request.method == 'POST':
          form = LabelingForm(request.POST)
          if form.is_valid():

        if "A" in request.POST:
             # required is false 

        if "B" in request.POST:
             # required is false 

        if "C" in request.POST:
             # required is true
           # change required to True 
            form.fields['First_choice'].required = True
            form.fields['Second_choice'].required = True

在模板中

<form  action="" method="post">{% csrf_token %}
 <input type="submit"  name="A" value="Submit A"></input>

 <input type="submit"  name="B" value="Submit B"></input>
 # change so that required is True
 {{ labelingform.first_choice}}{{ labelingform.second_choice}}<input type="submit"  name="C" value="Submit C"></input>

</form>

Answer 1

在 is_valid() 的调用之前 更改 required 属性：

if request.method == 'POST': form = LabelingForm(request.POST) required = 'C' in request.POST form.fields['First_choice'].required = required form.fields['Second_choice'].required = required if form.is_valid(): ...

根据视图中的条件更改表单中的必填字段（Django）

Changing required field in form based on condition in views (Django)

python

forms

django

required

multiplechoicefield