How to resolve a NameError: global name \\’ContactForm\\’ is not defined

How to resolve a NameError: global name 'ContactForm' is not defined

我在 Flask 中创建了一个联系表单，但它不起作用。它给出了错误 NameError: global name 'ContactForm' is not defined

自定义形式为：

<form action="{{ url_for('contact') }}" method=post>

  {{ form.hidden_tag() }}



  {{ form.name.label }}

  {{ form.name }}



  {{ form.email.label }}

  {{ form.email }}



  {{ form.subject.label }}

  {{ form.subject }}



  {{ form.message.label }}

  {{ form.message }}



  {{ form.submit }}

 </form>

from flask import Flask, render_template

from forms import ContactForm

app = Flask(__name__)   



def contact():

  form = ContactForm()



  if request.method == 'POST':

    return 'Form posted.'



  elif request.method == 'GET':

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



if __name__ == '__main__':

  app.run(debug=True)

from flask.ext.wtf import Form



from wtforms import TextField, TextAreaField, SubmitField, validators





class ContactForm(Form):

  name = TextField("Name", [validators.Required()])

  email = TextField("Email", [validators.Required(), validators.email()])

  subject = TextField("Subject", [validators.Required()])

  message = TextAreaField("Message", [validators.Required()])

  submit = SubmitField("Send")

routes.py 是：

<form action="{{ url_for('contact') }}" method=post>

  {{ form.hidden_tag() }}



  {{ form.name.label }}

  {{ form.name }}



  {{ form.email.label }}

  {{ form.email }}



  {{ form.subject.label }}

  {{ form.subject }}



  {{ form.message.label }}

  {{ form.message }}



  {{ form.submit }}

 </form>

from flask import Flask, render_template

from forms import ContactForm

app = Flask(__name__)   



def contact():

  form = ContactForm()



  if request.method == 'POST':

    return 'Form posted.'



  elif request.method == 'GET':

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



if __name__ == '__main__':

  app.run(debug=True)

from flask.ext.wtf import Form



from wtforms import TextField, TextAreaField, SubmitField, validators





class ContactForm(Form):

  name = TextField("Name", [validators.Required()])

  email = TextField("Email", [validators.Required(), validators.email()])

  subject = TextField("Subject", [validators.Required()])

  message = TextAreaField("Message", [validators.Required()])

  submit = SubmitField("Send")

我该如何解决这个问题？

创建一个名为 forms.py 的新文件并在其中插入以下代码。那么你的代码应该可以工作了。

<form action="{{ url_for('contact') }}" method=post>

  {{ form.hidden_tag() }}



  {{ form.name.label }}

  {{ form.name }}



  {{ form.email.label }}

  {{ form.email }}



  {{ form.subject.label }}

  {{ form.subject }}



  {{ form.message.label }}

  {{ form.message }}



  {{ form.submit }}

 </form>

from flask import Flask, render_template

from forms import ContactForm

app = Flask(__name__)   



def contact():

  form = ContactForm()



  if request.method == 'POST':

    return 'Form posted.'



  elif request.method == 'GET':

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



if __name__ == '__main__':

  app.run(debug=True)

from flask.ext.wtf import Form



from wtforms import TextField, TextAreaField, SubmitField, validators





class ContactForm(Form):

  name = TextField("Name", [validators.Required()])

  email = TextField("Email", [validators.Required(), validators.email()])

  subject = TextField("Subject", [validators.Required()])

  message = TextAreaField("Message", [validators.Required()])

  submit = SubmitField("Send")

首先，你有安装flask-wtf 吗？

试试这个：form = ContactForm(request.form)