Flask object 没有属性“validate_on_submit”

Question

我遇到了来自wtforms的 form.validate_on_submit() 方法的问题，每次提交表单时都会引发以下错误：

'LoginForm' object has no attribute 'validate_on_submit'

forms.py：

from wtforms import Form, validators, StringField, PasswordField

class LoginForm(Form):
    email = StringField('Email Address', [validators.DataRequired(message='Field required')])
    password = PasswordField('Password', [validators.DataRequired(message='Field required')])

路线.py

from flask import Flask, escape, request, render_template, redirect, url_for
from securepi import app, tools
from securepi.forms import LoginForm
@app.route('/login/', methods=['GET', 'POST'])
def login():
error = None
try:
    form = LoginForm(request.form)

    if request.method == "POST" and form.validate_on_submit():
        email = str(form.email.data)
        password = tools.encrypt(str(form.password.data))
        print("email:  {}, password: {}".format(email, password))


        # if valid account create session and redirect to index


        return redirect(url_for('index'))
    else:
        print("FAIL")
        error = "Invalid username or password"

except Exception as e:
    return(str(e))

return render_template('login.html', form = form)

和表格

<form action="" method="post">
  <div class="form-group has-feedback">
    <input type="email" name="email" class="form-control" placeholder="Email" value="{{ request.form.email }}">
    <span class="glyphicon glyphicon-envelope form-control-feedback"></span>
  </div>
  <div class="form-group has-feedback">
    <input type="password" name="password" class="form-control" placeholder="Password" value="{{ request.form.password }}">
    <span class="glyphicon glyphicon-lock form-control-feedback"></span>
  </div>
  <div class="row">
    <!-- /.col -->
    <div class="col-xs-12">
      <button type="submit" class="btn btn-primary btn-block">Log in</button>
    </div>
    <!-- /.col -->
  </div>
</form>

Answer 1

您可以尝试将 forms.py 更改为以下内容吗？

from flask_wtf import FlaskForm
from wtforms import validators, StringField, PasswordField

class LoginForm(FlaskForm):
    email = StringField('Email Address', [validators.DataRequired(message='Field required')])
    password = PasswordField('Password', [validators.DataRequired(message='Field required')])

Answer 2

Forms class文档说：

证实（）

通过在每个字段上调用 validate 来验证表单，将任何额外的 Form.validate_<fieldname> 验证器传递给字段验证器。

好像您正在尝试验证表单中缺少的on_submit字段。 简单地使用validate()应该可以解决问题。