77 WTForms常用验证器 · Flask notebook

# 77 WTForms常用验证器数据发过来时，经过表单验证，因此需要验证器来进行验证，以下对一些常用的内置验证器进行讲解: * Email:验证上传的数据是否为邮箱 ```text # 验证邮箱 email = StringField(validators=[Email()]) ``` * EqualTo:验证上传的数据是否和另外一个字段相等，常用的就是密码和确认密码两个字段是否相等 ```text # EqualTo指定与之保持相同值的字段 password_repeat = StringField(validators=[Length(min=6,max=10),EqualTo("password")]) ``` * InputRequired:原始数据的需要验证。如果不是特殊情况，应该使用InputRequired。 ```text # 验证用户是否输入 username = StringField(validators=[input_required()]) ``` * Length:长度限制，有min和max两个值进行限制 ```text username = StringField(validators=[Length(min=3,max=10,message="用户名长度必须在3到10位之间")]) ``` * NumberRange:数字的区间，有min和max两个值限制，如果处在两个数字之间则满足 ```text # 验证范围 age = IntegerField(validators=[NumberRange(12,18)]) ``` * Regexp:自定义正则表达式 ```text # 正则表达式 phone = StringField(validators=[Regexp(r'1[34578]\d{9}')]) ``` * URL:必须要是URL的形式 ```text # url验证 home_page = StringField(validators=[URL()]) ``` * UUID:验证UUID ```text # uuid值验证 uuid = StringField(validators=[UUID()]) ``` ## forms.py ```text from wtforms import Form,StringField,IntegerField from wtforms.validators import Length,EqualTo,Email,Regexp,input_required,NumberRange,URL,UUID # 继承Form class RegistForm(Form): # message指定错误信息 username = StringField(validators=[Length(min=3,max=10,message="用户名长度必须在3到10位之间")]) password = StringField(validators=[Length(min=6,max=10)]) # EqualTo指定与之保持相同值的字段 password_repeat = StringField(validators=[Length(min=6,max=10),EqualTo("password")]) class LoginForm(Form): # # 验证邮箱 # email = StringField(validators=[Email()]) # # 验证用户是否输入 # username = StringField(validators=[input_required()]) # # 验证范围 # age = IntegerField(validators=[NumberRange(12,18)]) # # 正则表达式 # phone = StringField(validators=[Regexp(r'1[34578]\d{9}')]) # # url验证 # home_page = StringField(validators=[URL()]) # uuid值验证 uuid = StringField(validators=[UUID()]) ``` ## login.html ```text <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>登录表</title> </head> <body> <form action="" method="POST"> <table> <tbody> <tr> <td>邮箱:</td> <td><input type="text" name="email"/></td> </tr> <tr> <td>用户民:</td> <td><input type="text" name="username"/></td> </tr> <tr> <td>年龄:</td> <td><input type="text" name="age"/></td> </tr> <tr> <td>手机号:</td> <td><input type="text" name="phone"/></td> </tr> <tr> <td>个人主页:</td> <td><input type="text" name="home_page"/></td> </tr> <tr> <td>UUID:</td> <td><input type="text" name="uuid"/></td> </tr> <tr> <td></td> <td><input type="submit" value="立即注册"/></td> </tr> </tbody> </table> </form> </body> </html> ``` myapp.py ```text @app.route("/login/",methods=["GET","POST"]) def login(): if request.method == "GET": return render_template("login.html") else: # 将表单数据传递给LoginForm进行验证 form = LoginForm(request.form) if form.validate(): return "successful" else: return "fail" #uuid值:fab3e92a-13b0-4938-bae8-5e58066ae11d # from uuid import uuid4 # print(uuid4()) ```