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Flask框架学习笔记之使用Flask实现表单开发详解

yipeiwu_com5年前 (2020-03-06)Python基础

本文实例讲述了使用Flask实现表单开发。分享给大家供大家参考，具体如下：

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>
  <div align="center">
  <h1>User Management</h1>
  <form method="post">
    <input type="text" name="username" placeholder="username" />
    <br>
    <input type="password" name="password" placeholder="password" />
    <br>
    <input type="submit" value="Submit">
    <input type="reset" value="Reset">
  </form>
  </div>
</body>
</html>

使用html实现的表单：

用flask实现相同功能的表单：

# -*- coding:utf-8 -*-
from flask import Flask, request, render_template, redirect
from wtforms import Form, TextField, PasswordField, validators
app = Flask(__name__)
class LoginForm(Form):
  # validators指定一个由验证函数组成的列表
  # 在接受用户提交的数据之前验证数据
  # 验证函数Required()确保提交的字段不为空
  username = TextField("username", [validators.Required()])
  password = PasswordField("password", [validators.Required()])
# 定义user路由
@app.route("/user", methods=['GET', 'POST'])
def login():
  myForm = LoginForm(request.form)
  if request.method == 'POST':
    # username = request.form['username']使用request获取数据
    # password = request.form['password']
    # 也可以使用类实例里的表单方法来获取相应的数据
    # validate来验证输入的表单数据是否有效
    if myForm.username.data == "loli" and myForm.password.data == "520" and myForm.validate():
      return redirect("http://www.baidu.com")
    else:
      message = "Login Failed"
      return render_template("form1.html", message=message, form=myForm)
  return render_template("form1.html", form=myForm)
if __name__ == '__main__':
  app.run()

form1模板：

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>
  <div align="center">
  <h1>User Management</h1>
  <form method="post">
    {% if message %}
      {{ message }}
    {% endif %}
    <br>
    {{ form.username }}
    <br>
    {{ form.password }}
    <br>
    <input type="submit" value="Submit">
    <input type="reset" value="Reset">
  </form>
  </div>
</body>
</html>