关于如何在 django 中编写自定义表单字段的教程? [英] Tutorial about how to write custom form fields in django?

问题描述

有什么好文章解释django中的自定义表单字段，而不是自定义模型字段?我通过谷歌找不到任何.

解决方案

表单字段易于自定义:

class UpperCaseField(forms.CharField):def清洁(自我，价值)尝试:返回值.upper()除了:引发验证错误

基本上，您只需创建一个类，该类继承自与您想要的最相似的字段，然后重写 clean() 方法，使其返回您想要的值.这是另一个例子:

class MyObjectField(forms.ModelChoiceField):# 在这种情况下，'value' 是一个字符串，表示# MyObject 的主键定义清洁(自我，价值):尝试:返回 MyObject.objects.get(pk=value)除了:引发验证错误

自定义小部件另一方面，更有用一点，但更难做，因为还有一些方法需要编写，以便它们顺利工作.>

Is there any good articles that explain custom form fields in django, not custom model fields? I couldn't find any through google.

解决方案

Form fields are easy to customize:

class UpperCaseField(forms.CharField):
    def clean(self, value)
        try:
            return value.upper()
        except:
            raise ValidationError

basically you just create a class that inherits from the field that most resembles what you want, then rewrite the clean() method so that it returns the value you want. Here is another example:

class MyObjectField(forms.ModelChoiceField):
    # in this case, 'value' is a string representing
    # the primary key of a MyObject
    def clean(self, value):
        try:
            return MyObject.objects.get(pk=value)
        except:
            raise ValidationError

custom widgets on the other hand, are a little more useful, but a little more hard to do because there are a few more methods that need to be written so that they work smoothly.

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