根据视图中的条件（Django）更改窗体中的必填字段 [英] Changing required field in form based on condition in views (Django)

问题描述

我有一个表单，LabelingForm（）有两个多选区，我希望设置必需的参数，使其在按A和B按钮时为False，而按下按钮C则为True。我尝试使用initial = False和required = True，但它不起作用，按按钮A时需要选择字段。

in forms.py

pre> 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


in views.py

  def function（request，postID）：
 if request.method =='POST'：
 form = LabelelingForm（request.POST）
如果form.is_valid（）：
 
如果请求中的A.POST：
＃必需是false 
 
如果B在request.POST：
＃必需是假
 
如果C在request.POST：
＃必需是真的
＃需要更改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 =submitname =Avalue =提交A>< / input> 
 
< input type =submitname =Bvalue =提交B>< / input> 
＃更改，所以必需的是True 
 {{labelsform.first_choice}} {{labelsform.second_choice}}< input type =submitname =Cvalue =Submit C> < /输入> 
 
< / form> 
  

解决方案

更改 code>属性之前调用 is_valid（）：

  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 
 
如果form.is_valid（）：
 .. 
  




I have a form, LabelingForm() with two multiplechoicefields and I wish to set the required - parameter so that it is False when pressing button A and B but True when pressing button C. I 've tried with initial = False and required = True but it doesn't work, it requires field choice when pressing button A.

in 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)

in 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

in template

<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>

解决方案

Change the required attribute before the calling of is_valid():

   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():
          ...

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