我希望我的表单是动态的,IntegerField的一些参数为max_length,因模型而异。通过使用here中的信息,我写了这样的表格:
def my_form(inputname, inputlastname, inputamount):
class MyForm(forms.Form):
name = forms.CharField(max_length=50,required=True,initial=inputname)
lastname = forms.CharField(max_length=50, required=True,initial=inputlastname)
amount= forms.IntegerField(max_value=inputamount, required=True)
return MyForm
当我像这样调用它并传递给模板时,它在模板上渲染得很好:
form = my_form("David","Bowie",4)()
但是我无法弄清楚如何验证它,这失败了:
如果request.method =='POST': form = MyForm(request.POST) 如果form.is_valid()
答案 0 :(得分:4)
没有理由这样做。你的事情变得不必要了。
不是将初始值传递给返回具有预定义类的类的工厂函数,而是在表单定义中省略初始参数,并在表单实例化期间传递它们:
class MyForm(forms.Form):
name = forms.CharField(max_length=50,required=True)
lastname = forms.CharField(max_length=50, required=True)
...
form = MyForm(request.POST, initial={'firstname':myfirstname, 'surname':mysurname})
在追加问题后修改
为了获得金额的动态max_value
,您可以覆盖表单的__init__
方法并将其设置在那里。然后再次在实例化中传递值。
class MyForm(forms.Form):
name = forms.CharField(max_length=50,required=True)
lastname = forms.CharField(max_length=50, required=True)
amount = forms.IntegerField(required=True)
def __init__(self, *args, **kwargs):
amount_max = kwargs.pop('amount_max', None)
super(MyForm, self).__init__(*args, **kwargs)
if amount_max:
self.fields['amount'].max_value = amount_max
...
form = MyForm(request.POST, amount_max=10,
initial={'firstname':myfirstname, 'surname':mysurname})