Form组件扩展
1.用Form组件自带的正则扩展
通过Django内置的字段：Validators自定义验证规则
方式一：
from django.forms import Form from django.forms import widgets from django.forms import fields from django.core.validators import RegexValidator class MyForm(forms.Form): Username = fields.CharField( validators =[RegexValidator(r‘^[0-9]+$‘, ‘请输入数字‘), RegexValidator(r‘^159[0-9]+$‘, ‘数字必须以159开头‘)], )
方式二：
from django.forms import Form from django.forms import widgets from django.forms import fields from django.core.validators import RegexValidator class MyForm(Form): user = fields.RegexField(
r‘^[0-9]+$‘,error_messages={‘invalid1‘: ‘...‘，‘invalid2‘:‘...‘}
)
2.自定义方法单字段的判断
class UserInfo(forms.Form):
username = fields.CharField()
user_id = fields.IntegerField(
widget=(
widgets.Select(choices=[(0, ‘证没那个‘), (1, ‘网名‘), (2, ‘刘敏‘),])
)
)
# 在源码中出错会抛出一个 ValidationError 异常
from django.core.exceptions import NON_FIELD_ERRORS, ValidationError
def clean_username(self):
#只能取当前字段的值，不能取其它字段的值
v = self.cleaned_data[‘username‘]
#如果用户数大于0
if models.UserInfo.objects.filter(username=v).count():
raise ValidationError(‘用户名已存在‘)
return self.cleaned_data[‘username]
自定义方法验证整体
# django为我们预留了这个钩子函数，当所有clean_字段名 的方法结束后，会再执行这个函数
"""
Hook for doing any extra form-wide cleaning after Field.clean() has been
called on every field. Any ValidationError raised by this method will
not be associated with a particular field; it will have a special-case
association with the field named ‘__all__‘.
"""
def clean(self):
# 获取所有通过验证的数据
value_dict =self.cleaned_date
v1 = value_dict.get(‘username‘)
v2 = value_dict.get(‘user_id‘)
if v1 == ‘root‘ and v2 == 1:
# 在前端取时，用__all__来取
raise ValidationError(‘整体错误信息‘)
return self.cleaned_data
# 当clean方法执行完成后，还会再执行这个方法，我们可以重写，没有返回值，一般不用
def _post_clean(self):
pass
原文：https://www.cnblogs.com/toby-yu/p/12366583.html