WTF表单验证可分为3个步骤：
①导入wtf扩展提供的表单验证器。（from wtforms.validators import DataRequired,EqualTo）
②定义表单类
# 定义表单类 class RegisterForm(FlaskForm): username =StringField('账号：',validators=[DataRequired()]) password =PasswordField('密码：',validators=[DataRequired()]) password2 = PasswordField('确认密码：',validators=[DataRequired(),EqualTo('password','两次密码不一致')]) submit=SubmitField('提交')
③验证逻辑（判断请求方式——>请求参数——>验证）
redist_form=RegisterForm() if request.method=='POST': username=request.form.get('username') password = request.form.get('password') password2 = request.form.get('password2') if redist_form.validate_on_submit(): print(username,password) return 'success' else: flash('参数有误') return render_template('registform.html',form=redist_form)
完整代码：
app.py
from flask import Flask,render_template,request,flash from flask_wtf import FlaskForm from wtforms import StringField, PasswordField,SubmitField from wtforms.validators import EqualTo,DataRequired app = Flask(__name__) app.secret_key='yingjie' # 定义表单类 class RegisterForm(FlaskForm): username =StringField('账号：',validators=[DataRequired()]) password =PasswordField('密码：',validators=[DataRequired()]) password2 = PasswordField('确认密码：',validators=[DataRequired(),EqualTo('password','两次密码不一致')]) submit=SubmitField('提交') @app.route('/regist',methods=['GET','POST']) def regist_form(): redist_form=RegisterForm() if request.method=='POST': username=request.form.get('username') password = request.form.get('password') password2 = request.form.get('password2') if redist_form.validate_on_submit(): print(username,password) return 'success' else: flash('参数有误') return render_template('registform.html',form=redist_form) if __name__ == '__main__': app.run()
registform.html
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <form method="post"> {{ form.csrf_token() }} {{ form.username.label }}{{ form.username }}<br> {{ form.password.label }}{{ form.password }}<br> {{ form.password2.label }}{{ form.password2 }}<br> {{ form.submit }} </form> {% for message in get_flashed_messages() %} {{ message }} {% endfor %} </body> </html>
运行截图：
