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How can I dynamically define forms.IntegerField's min_value parameter?(如何动态定义表单。IntegerField的min_value参数?)

转载 作者:bug小助手 更新时间:2023-10-22 17:34:56 29 4
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I am working with Django and its Forms classes.

我正在使用Django及其Forms类。


I have created a Form with a single forms.IntegerField and I want to define its min_value parameter dynamically:

我已经创建了一个具有单个表单的表单。IntegerField和我想要动态定义它的min_value参数:


class BiddingForm(forms.Form):
bidding_form = forms.IntegerField(min_value=1, help_text="€", label="Bid")

Right now, it is statically set to 1. I have tried to overwrite the __init__() function and pass in a min_value there. But since bidding_form is a class variable, I cannot use the resulting instance variable min_value on it:

现在,它被静态地设置为1。我试图覆盖__init__()函数,并在那里传递一个min_value。但是由于bidding_form是一个类变量,我不能在它上面使用生成的实例变量min_value:


class BiddingForm(forms.Form):
min_value = 1

def __init__(self, min_value):
super().__init__()
self.min_value = min_value

bidding_form = forms.IntegerField(min_value=min_value, help_text="€", label="Bid")

As of my understanding, above class creates an instance variable min_value inside of __init__() which just shadows the class variable min_value and it ultimately results in min_value being 1 in the bidding_form's declaration.

Since I have little understanding of Python and Django, I have not yet found a solution to this.

So, how can I dynamically define forms.IntegerField's min_value parameter?

据我所知,上面的类在__init__()中创建了一个实例变量min_value,它只是隐藏了类变量min_vvalue,最终导致在bidding_form的声明中min_value为1。由于我对Python和Django了解不多,所以我还没有找到解决方案。那么,我如何动态定义表单呢。IntegerField的min_value参数?


更多回答
优秀答案推荐

You override the min_value of the field:

覆盖字段的最小值(_V):


from django.core import validators MinValueValidator

class BiddingForm(forms.Form):
bidding_form = forms.IntegerField(help_text='€', label='Bid')

def __init__(self, *args, min_value=None, **kwargs):
super().__init__(*args, **kwargs)
bidding_form = self.fields['bidding_form']
bidding_form.min_value = min_value
if min_value is not None:
bidding_form.validators.append(MinValueValidator(min_value))
bidding_form.widget.attrs['min'] = min_value



Correct way is:

正确的方法是:


class BidForm(forms.Form):
bid = forms.IntegerField()

def __init__(self, min_bid_value=0, *args, **kwargs):
super(BidForm, self).__init__(*args, **kwargs)
self.fields['bid'].widget.attrs['min'] = min_bid_value

You can call it like :

你可以这样称呼它:


BidForm(min_bid_value=145)

and form won't let user enter number less than 145.

表单不允许用户输入小于145的数字。



i dont think so but you can do check the length of the specified field before you check if form.is_valid():. like: if len(form.cleaned_data['field']) < min:

我不这么认为,但你可以先检查指定字段的长度,然后再检查form.is_valid():.like:if len(form.cleane_data['field'])


更多回答

Thank you for the fast answer. Unfortunately, I have encoutered 2 problems. When I pass self to super().__init() I am getting 'BiddingForm' object has no attribute 'get'. When I leave it, the site is shown but the min_value is ignored and my IntegerField can now have any value. How is that?

谢谢你的快速回答。不幸的是,我遇到了两个问题。当我把self传递给super()时__init()我正在获取“BiddingForm”对象没有属性“get”。当我离开它时,会显示站点,但min_value被忽略,我的IntegerField现在可以有任何值。怎么了?

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