Django Form two

Django_Form:

    1.class TeacherNewForm(Form):

        username = fields.CharField(

            required=True,

            error_messages={'required': '用戶名不能爲空'},

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

        )  # 不能爲空

        password = fields.CharField(required=True, error_messages={'required': '密碼不能爲空'},

             widget=widgets.TextInput(attrs={'placeholder': '密碼', 'class': 'form-control'}))  # 不能爲空

        email = fields.EmailField(required=True, error_messages={'required': '郵箱不能爲空', 'invalid': '郵箱格式錯誤'},

            widget=widgets.EmailInput(

            attrs={'placeholder': '郵箱', 'class': 'form-control'}))  # 不能爲空，且郵箱格式

 

        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.# 顯示input，而且將數據庫中的默認值填寫到input框中

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

   

    3.class DiyForm(forms.Form):

        # 類中建立字段  例如 IntegerField包含了正則表達式

        user = fields.CharField(

            max_length=18,

            min_length=6,

            required=True,

            error_messages={

                'max_length': '用戶名過長',

                'min_length': '用戶名太短',

                'required': '用戶名不能爲空',

                'invalid': '輸入類型錯誤'

            }

        )

       

    4.import uuid

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

       

    5.# 多選checkbox,值爲列表

        user = fields.MultipleChoiceField(

        initial=[2, ],

        choices=((1, '上海'), (2, '北京'),),

        widget=widgets.CheckboxSelectMultiple

       

    6.class FInfo(forms.Form):#從數據庫實時獲取數據

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

       

     推薦使用：必須使用values_list，放回元組的類型[(1,"講師"),(2,"班主任"),(3,"管理員")]

        classteacher_id = fields.ChoiceField(choices=[])

        def __init__(self,*args,**kwargs):   #重寫init方法，時時更新

            super().__init__(*args,**kwargs)   #繼承父類

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

       

    7.自定義校驗

        .class MyForm(Form):

            phone = fields.CharField(

            validators=[RegexValidator(r'^[0-9]+$', '請輸入數字'), RegexValidator(r'^188[0-9]+{9}$', '數字必須以188開頭')],

           

        .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('手機號碼格式錯誤')

               

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

                            error_messages={'required': '手機不能爲空'},

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

                                                          'placeholder': u'手機號碼'}))                                                       

    8.clean_field:#在form驗證完後驗證相對應的字段

        def clean_user(self): #必須有返回值，只能拿當前字段

            """

            Form中字段中定義的格式匹配完以後，執行此方法進行驗證

            :return:

            """

            v = self.cleaned_data['user']

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

                raise ValidationError('此用戶名已經存在')

            return v

           

    9.clean：#驗證全部字段

            #設置總體錯誤，能夠用來設置多個字段總體驗證

            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('總體錯誤信息')

                return self.cleaned_data

    10.中間件：

        請求 ->process_request1 ->process_request3 ->process_view1 ->process_view3 ->視圖view

        ->prcess_exception3 ->prcess_exception1 ->process_response3 ->process_response1 ->請求

       

        class Md2(MiddlewareMixin):

            def process_request(self,request):

                print("Md2請求")

                # return HttpResponse("Md2中斷")

            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.認證使用

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

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

        from = TeacherForm(dat = request.POST)

        from.is_valid()

        from.cleaned_data#一個列表

        form.as_json()

        from.errors #一個列表

        - 主動向form中添加錯誤信息

        　　# form.add_error('password','用戶名或密碼錯誤')

        　　form.add_error('password',ValidationError('用戶名或密碼錯誤'))

        　　這兩個均可以，建議用第二個