forms元件

from django import forms

class Myforms(forms.Form):
    name = forms.CharField(max_length=8,min_length=3 ,label='使用者名稱',
                           error_messages={'max_length':"最長是8","min_length":'最短是3','required':'這個必須填'},
                           widget=widgets.TextInput(attrs={"class
 
":"form-control","id":"name"})
                           )

    pwd = forms.CharField(max_length=8,min_length=3,label='密碼' ,required=True,
                          error_messages={'max_length':"最長是8","min_length":'最短是3','required':'這個必須填'},
                          widget=widgets.PasswordInput(attrs={"
 
class":"form-control","id":"pwd"})
                          )

    re_pwd = forms.CharField(max_length=8, min_length=3, label='確認密碼', required=True,
                          error_messages={'max_length': "最長是8", "min_length": '最短是3', 'required': '這個必須填'},
                          widget=widgets.PasswordInput(attrs={"
 
class":"form-control","id":"re_pwd"})
                             )

    email = forms.EmailField(label='郵箱',error_messages={'required':'這個必須填','invalid':'不符合郵箱格式'},
                             widget=widgets.EmailInput(attrs={"class":"form-control","id":"email"})
                             )



    #區域性鉤子
    def clean_name(self):
        name = self.cleaned_data.get('name')
        names = models.User.objects.all()
        print(name)
        print(names)
        for i in names:
            if i.name == name:
                raise ValidationError('該名字已註冊')
            return name
        
    #全域性鉤子
    def clean(self):
        pwd = self.cleaned_data.get('pwd')
        re_pwd = self.cleaned_data.get('re_pwd')
        if pwd == re_pwd:
            return self.cleaned_data
        else:
            raise ValidationError('兩次密碼不一致')

（一）校驗欄位功能

myform = Myforms({"name":'lxx',"pwd":'123'})
    myform.is_valid()      判斷校驗是否成功
    myform.cleaned_data  校驗成功通過的資料
    myform.errors   校驗錯誤的資訊
    myform.errors[0]   取其中一條
    欄位也有錯誤資訊功能
    myform.errors['__all__'][0]  全域性鉤子資訊