使用Flask从WTForm进行电子邮件验证

Question

我正在关注来自http://code.tutsplus.com/tutorials/intro-to-flask-adding-a-contact-page--net-28982的Flask教程,目前我仍然坚持验证步骤:

旧版本有以下内容:

from flask.ext.wtf import Form, TextField, TextAreaField, SubmitField, validators, ValidationError

class ContactForm(Form):
name = TextField("Name",  [validators.Required("Please enter your name.")])
email = TextField("Email",  [validators.Required("Please enter your email address."), validators.Email("Please enter your email address.")])
submit = SubmitField("Send")

阅读评论后我将其更新为:(用InputRequired替换validators.Required)

(same fields)  

class ContactForm(Form):  
name = TextField("Name", validators=[InputRequired('Please enter your name.')])
email = EmailField("Email",  validators=[InputRequired("Please enter your email address.")]), validators.Email("Please enter your email address.")])
submit = SubmitField("Send")

我唯一的问题是我不知道如何处理validators.Email.我得到的错误信息是:

NameError: name 'validators' is not defined

我查看了文档,也许我没有深入研究,但我似乎无法找到电子邮件验证的示例.

Answer 1

试试这个:

from flask.ext.wtf import Form
from wtforms import validators
from wtforms.fields.html5 import EmailField

class ContactForm(Form):
    email = EmailField('Email address', [validators.DataRequired(), validators.Email()])

Answer 2

我完成了与进阶课程相同的教程（几年没看过烧瓶了）。

该问题是由于您在0.9版本的Flask-WTF中进行了更改。 在这里，他们说：

注意：从0.9.0版开始，Flask-WTF不会从wtforms导入任何内容，您需要从wtforms导入字段。

要直接导入，forms.py应该显示为：

from flask.ext.wtf import Form
from wtforms import StringField, TextAreaField, SubmitField
from wtforms.validators import InputRequired, Email

class ContactForm(Form):
  name = StringField("Name",  [InputRequired("Please enter your name.")])
  email = StringField("Email",  [InputRequired("Please enter your email address."), Email("This field requires a valid email address")])
  subject = StringField("Subject",  [InputRequired("Please enter a subject.")])
  message = TextAreaField("Message",  [InputRequired("Not including a message would be stupid")])
  submit = SubmitField("Send")

请注意，StringFieldreplaces TextField和that InputRequired 优先于 DataRequired。直接导入验证器而不是导入整个名称空间是个人喜好。这也适用：from wtforms import *在表单类中：name = StringField("Name", [validators.InputRequired("message")

当您更新到最新版本的Flask-WTF时，您也可以validate_on_submit()在视图中使用它（如此处推荐）。

并且便利的validate_on_submit将检查它是否是POST请求以及它是否有效。