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