我是Flask和WTForms的新手,我无法渲染我的HTML页面。我一次又一次地浏览了WTforms文档,但我无法找到错误的来源:
jinja2.exceptions.UndefinedError, UndefinedError: 'form' is undefined
我的代码如下:
forms.py
from flask.ext.wtf import Form
from wtforms import TextField, BooleanField, TextAreaField, StringField, PasswordField, SelectField, validators
class LoginForm(Form):
username = TextField('Username', [
validators.Required(),
validators.Length(min=4, max=25)
])
password = PasswordField('New Password', [
validators.Required()
])
app.py
from forms import *
from wtforms import Form, fields, BooleanField, TextField, StringField, PasswordField, validators
from werkzeug.security import generate_password_hash, \
check_password_hash
@app.route('/login/', methods=['GET', 'POST'])
def login():
form = LoginForm(request.form)
if request.method == 'POST' and form.validate():
if load_user(form.username.data) is None:
flash('Invalid username')
else:
if check_password_hash(cred.password, form.password.data):
return redirect(url_for('browse'))
else:
flash('Invalid password')
return render_template('login.html', title='Login', form=form)
的login.html
{% extends "base.html" %}
{% block body %}
<form action="{{ url_for('login') }}" method="Post">
<fieldset>
<div>{{ form.username.label }}: {{ form.username() }}</div>
<div>{{ form.password.label }}: {{ form.password() }}</div>
<div class="form-group">
<button class="btn btn-default" type="submit">
<span aria-hidden="true" class="glyphicon glyphicon-log-in"></span>
Log In
</button>
</div>
</fieldset>
</form>
<div>
or <a href="new">Register</a> for an account
</div>
{% endblock %}
答案 0 :(得分:6)
您还必须使用return
声明 - 例如:
return render_template('login.html', title='Login', form=form)
在所有if-else
分支中,否则form
上下文变量不会传递给模板。 login
函数应如下所示:
@app.route('/login/', methods=['GET', 'POST'])
def login():
form = LoginForm(request.form)
if request.method == 'POST' and form.validate():
if load_user(form.username.data) is None:
flash('Invalid username')
return render_template('login.html', title='Login', form=form)
else:
if check_password_hash(cred.password, form.password.data):
return redirect(url_for('browse'))
else:
flash('Invalid password')
return render_template('login.html', title='Login', form=form)
return render_template('login.html', title='Login', form=form)