1.CBV :
 from flask import views
 
 class LoginView(views.MethodView):
  def get(self):
   return
   
  def post(self):
   return
   
 
 app.add_url_rule("/login",endpoint=None,view_func=LoginView.as_view("login"))
 
2.flash:
 from flask import flash,get_flash_messages
 
 flash("","tag")
 get_flash_messages("tag")
  3.Flask-Session
 from flask_session import Session
 from flask import session
 
 app.config["SESSION_TYPE"] = "redis"
 app.config["SESSION_REDIS"] = Redis("127.0.0.1",6379,db=7)
 Session(app)
 
 session["user"] = "123"
 session.get("user")
 
4.WTForms - MoudelForm
 from wtfroms.fields import simple,core
 from wtfroms import Form,validators
 
 class LoginForm(Form):
  username = simple.StringFields(
   label = "" #看原始碼 __init__
  )
  
 
 lf = LoginForm()
 render_template("html",lf=lf)
 
 {{ lf.uername }}
 {{ lf.uername.label }}
 {{ lf.uername.errors.0 }}
 
 lf = LoginForm(request.form)
 
 if not lf.validata():
  render_template("html",lf=lf)
 
 lf.data.get("username")
    **************************************************************************************************************************************  

from flask import Flask,request,render_template
from flask import views
from wtforms import Form #類似 form表單
from wtforms.fields import simple,core
from wtforms import validators #驗證器

app=Flask(__name__)
#登入頁面認證
class LoginForm(Form):
    username=simple.StringField(
        label='使用者名稱',
        validators=[
            validators.DataRequired(message='不能為空'),#直接把錯誤寫入
            validators.Length(min=3,max=5,message='不能小於3位，不能大於5位')
        ],
        render_kw={'class':'my_username'}, #相等於自定義的類,屬性
    )

    password=simple.PasswordField(
        label='密碼',
        validators=[
           validators.DataRequired(message='不能為空'),
            validators.length(min=6,max=6,message='密碼必須為6位'),
            validators.Regexp(regex='\d+',message='密碼必須為數字'),
        ],
        render_kw={'class':'my_password'}
    )

#註冊頁面認證
class RegForm(Form):
    username=simple.StringField(
        label='密碼',
        validators=[
            validators.DataRequired(message='不能為空'),
            validators.Length(min=3,max=5,message='')
        ],
        render_kw={'class':'my_username'}
    )
    nickname=simple.StringField(
        label='暱稱',
        validators=[
            validators.DataRequired(message='不能為空')],
        render_kw={'class':'my_nickname'}
    )

    password=simple.PasswordField(
        label='密碼',
        validators=[
            validators.DataRequired(message='不能為空'),
            validators.Length(min=6,max=6,message='密碼必須為6位'),
            validators.Regexp(regex='\d+',message='密碼必須為數字')
        ],
        render_kw={'class':'my_password'}
    )

    repassword=simple.PasswordField(
        label='確認密碼',
        validators=[ #EqualTo 等於    與欄位匹配
            validators.EqualTo(fieldname='password',message='兩次不一致')
        ],
        render_kw={'class':'my_password'}
    )

    email=simple.StringField(
        label='郵箱',
        validators=[
            validators.Email(message='格式不正確')
        ],
        render_kw={'class':'myemail'}
    )

    #上面用simple  下面用core
    gender=core.RadioField(
        label='性別',
        coerce=int,  #型別為int
        choices=(
            (1,'女'),
            (2,'男')
        ),
        default=1  #預設為1
    )

    hobby=core.SelectMultipleField(
        label='愛好',
        coerce=int,
        choices=(
            (1,'小姐姐'),
            (2,'小蘿莉'),
            (3,'小哥哥'),
            (4,'正太'),
            (5,'小阿姨'),
            (6,'小大叔'),
        ),
        default=(1,2,5)
    )

    submit=simple.SubmitField(
        label='提交'
    )



#登入驗證
class LoginClass(views.MethodView):
    def get(self):
        froms=LoginForm()
        return render_template('login.html',froms=froms)

    def post(self):
        froms=LoginForm(request.form)
        if froms.validate(): #django 是is_valid()
            return '110'
        else:
            return render_template('login.html',froms=froms)

app.add_url_rule('/login',view_func=LoginClass.as_view('login'))


#註冊

class RegClass(views.MethodView):

    def get(self):
        froms=RegForm()
        return render_template('reg.html',froms=froms)

    def post(self):
        froms=RegForm(request.form)
        if froms.validate():
            return '120'
        else:
            return render_template('reg.html',froms=froms)
app.add_url_rule('/reg',view_func=RegClass.as_view('reg'))




if __name__ == '__main__':
    app.run(debug=True)