Django Form two

Django_Form:

1.class TeacherNewForm(Form):

username = fields.CharField(

required=True,

error_messages={'required': '用户名不能为空'},

widget=widgets.TextInput(attrs={'placeholder': '用户名', 'class': 'form-control'})

)  # 不能为空

password = fields.CharField(required=True, error_messages={'required': '密码不能为空'},

widget=widgets.TextInput(attrs={'placeholder': '密码', 'class': 'form-control'}))  # 不能为空

email = fields.EmailField(required=True, error_messages={'required': '邮箱不能为空', 'invalid': '邮箱格式错误'},

widget=widgets.EmailInput(

attrs={'placeholder': '邮箱', 'class': 'form-control'}))  # 不能为空，且邮箱格式

cls_list = fields.MultipleChoiceField(choices=[])

def __init__(self,*args,**kwargs):

super().__init__(*args,**kwargs)

self.fields['cls_list'].choices = models.ClassList.objects.values_list('id','caption')

2.# 显示input，并且将数据库中的默认值填写到input框中

form = TeacherForm(initial={'username':obj.username,'password':obj.password,'email':obj.email})

3.class DiyForm(forms.Form):

# 类中创建字段  例如 IntegerField包含了正则表达式

user = fields.CharField(

max_length=18,

min_length=6,

required=True,

error_messages={

'max_length': '用户名过长',

'min_length': '用户名过短',

'required': '用户名不能为空',

'invalid': '输入类型错误'

}

)

4.import uuid

data = uuid.uuid4() '16fd2706-8baf-433b-82eb-8c7fada847da'

5.# 多选checkbox,值为列表

user = fields.MultipleChoiceField(

initial=[2, ],

choices=((1, '上海'), (2, '北京'),),

widget=widgets.CheckboxSelectMultiple

6.class FInfo(forms.Form):#从数据库实时获取数据

authors = form_model.ModelMultipleChoiceField(queryset=models.NNewType.objects.all())

推荐使用：必须使用values_list，放回元组的类型[(1,"讲师"),(2,"班主任"),(3,"管理员")]

classteacher_id = fields.ChoiceField(choices=[])

def __init__(self,*args,**kwargs):   #重写init方法，时时更新

super().__init__(*args,**kwargs)   #继承父类

self.fields["classteacher_id"].choices = models.UserInfo.objects.filter(ut_id = settings.ROLE_CLASSTEACHER).values_list('id', "username")

7.自定义校验

.class MyForm(Form):

phone = fields.CharField(

validators=[RegexValidator(r'^[0-9]+$', '请输入数字'), RegexValidator(r'^188[0-9]+{9}$', '数字必须以188开头')],

.def mobile_validate(value):

mobile_re = re.compile(r'^(13[0-9]|15[012356789]|17[678]|18[0-9]|14[57])[0-9]{8}$')

if not mobile_re.match(value):

raise ValidationError('手机号码格式错误')

phone = fields.CharField(validators=[mobile_validate, ],

error_messages={'required': '手机不能为空'},

widget=widgets.TextInput(attrs={'class': "form-control",

'placeholder': u'手机号码'}))

8.clean_field:#在form验证完后验证相对应的字段

def clean_user(self): #必须有返回值，只能拿当前字段

"""

Form中字段中定义的格式匹配完之后，执行此方法进行验证

:return:

"""

v = self.cleaned_data['user']

if models.UserInfo.objects.filter(user=v).count():

raise ValidationError('此用户名已经存在')

return v

9.clean：#验证所有字段

#设置整体错误，可以用来设置多个字段整体验证

def clean(self):

value_dict=self.cleaned_data

v1 = value_dict.get('username')

v2 = value_dict.get('user_id')

if v1=='root' and v2==0:

raise ValidationError('整体错误信息')

return self.cleaned_data

10.中间件：

请求 ->process_request1 ->process_request3 ->process_view1 ->process_view3 ->视图view

->prcess_exception3 ->prcess_exception1 ->process_response3 ->process_response1 ->请求

class Md2(MiddlewareMixin):

def process_request(self,request):

print("Md2请求")

# return HttpResponse("Md2中断")

def process_response(self,request,response):

print("Md2返回")

return response

def process_view(self, request, callback, callback_args, callback_kwargs):

print("md2 process_view...")

def process_exception(self):

print("md1 process_exception...")

11.认证使用

form = TeacherForm(initial={"username":obj.username,"password":obj.password,"email":obj.email,

"teacher_classes":[obj.id for obj in obj.teacher_classes.all()]}) #带有初始化的Form

from = TeacherForm(dat = request.POST)

from.is_valid()

from.cleaned_data#一个列表

form.as_json()

from.errors #一个列表

- 主动向form中添加错误信息

　　# form.add_error('password','用户名或密码错误')

　　form.add_error('password',ValidationError('用户名或密码错误'))

　　这两个都可以，建议用第二个