При тестировании сообщения об ошибке «сбой входа в систему» на моей странице я постоянно получаю неопределенную форму jinja error.Я очень новичок в программировании на Python / Flask и использовании модальностей и форм начальной загрузки, так что я уверен, что это что-то простое, что я пропускаю.Поскольку я использую модалы, мне нужно было добавить команды для каждого маршрута страницы в коде Python, и я чувствую, что ошибка во вложенном If, который я там использую.
Я пытался переместить Flaskкод вокруг так, чтобы часть входа в систему запускалась первой, но независимо от того, что я пытаюсь, я получаю ту же ошибку.Я могу войти с известными, хорошими именами пользователя и паролями, и я могу зарегистрировать новые имена пользователей без проблем.Я прошу прощения, если это слишком много информации, я не публиковал здесь раньше, но я часто использовал SO для устранения неполадок, поэтому у меня хорошее чувство, что сообщество здесь может определить, что я делаю неправильно.
ВотPython
#Define routes
@app.route('/home', methods=['GET', 'POST'])
def index():
#Allow registry from page
form = RegisterForm(request.form)
if request.method == 'POST' and form.validate():
name = form.name.data
email = form.email.data
username = form.username.data
password = sha256_crypt.encrypt(str(form.password.data))
# Execute query
engine.execute("INSERT INTO users(name, email, username, password) VALUES(?, ?, ?, ?)", (name, email, username, password))
# Changes Auto Commit so there is no need for opening a session or running a commit line.
flash('You are now registered and can log in', 'success')
return redirect(url_for('index'))
else:
#Allow login from page
if request.method == 'POST':
# Get Form Fields
username = request.form['username']
password_candidate = request.form['password']
# Get user by username
result = engine.execute("SELECT Username, Password FROM users WHERE username = ?", [username])
# Get stored hash
data = result.fetchone()
if data is None:
error = 'Username not found'
return render_template('home.html', error=error)
password = data['Password']
# Compare Passwords
if sha256_crypt.verify(password_candidate, password):
# Passed
session['logged_in'] = True
session['username'] = username
flash('You are now logged in', 'success')
return redirect(url_for('dashboard'))
else:
error = 'Invalid login'
return render_template('home.html', error=error)
return render_template('home.html', form=form)
Вот HTML
<nav class="navbar navbar-expand-lg navbar-dark bg-dark">
<a class="navbar-brand" href="#"><img src="/static/images/kissclipart-sti-logo2.png"></a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
{% if session.logged_in %}
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav mr-auto">
<li class="nav-item">
<a class="nav-link" href="/home"><i class="fas fa-home"></i> Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="/about"><i class="fas fa-chalkboard"></i> About Us</a>
</li>
<li class="nav-item">
<a class="nav-link" href="/articles"><i class="fas fa-book"></i> Articles</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Dropdown
</a>
<div class="dropdown-menu" aria-labelledby="navbarDropdown">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</li>
</ul>
{% else %}
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav mr-auto">
<li class="nav-item">
<a class="nav-link" href="/home"><i class="fas fa-home"></i> Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="/about"><i class="fas fa-chalkboard"></i> About Us</a>
</li>
</ul>
{% endif %}
<ul class="navbar-nav navbar-right">
{% if session.logged_in %}
<li class="nav-item">
<!-- <button type="button" class="btn btn-secondary" onclick="window.location.href='/dashboard'"><i class="fas fa-tachometer-alt"></i> Dashboard</a></li> -->
<a class="nav-link" href="/dashboard"><i class="fas fa-tachometer-alt"></i> Dashboard </a>
<li class="nav-item">
<!-- LogOut Modal Button -->
<!-- <button type="button" class="btn btn-primary" data-toggle="modal" data-target="#Logout_Modal"><i class="fas fa-sign-out-alt"></i>
Log out
</button> -->
<a class="nav-link" data-toggle="modal" data-target="#Logout_Modal" href="#Logout_Modal"><i class="fas fa-sign-out-alt"></i> Logout </a>
<!-- Modal -->
<div class="modal fade" id="Logout_Modal" tabindex="-1" role="dialog" aria-labelledby="Logout_ModalLabel" aria-hidden="true">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="Logout_ModalLabel">Log out?</h5>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">
Are you sure you want to logout?
</div>
<div class="modal-footer">
<button type="button" class="btn btn-outline-danger" data-dismiss="modal">No, still working!</button>
<button type="button" class="btn btn-outline-success" onclick="window.location.href='/logout';">Yup, all done!</button>
</div>
</div>
</div>
</div>
</ul>
<form class="form-inline my-2 my-lg-0">
<input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
<button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
</form>
</div>
</nav>
{% else %}
<li class="nav-item mr-auto">
<!-- Register Modal Button -->
<button type="button" class="btn btn-outline-success" data-toggle="modal" data-target="#Register_Modal"><i class="fas fa-user-plus"></i>
Register?
</button>
<!-- Modal -->
<div class="modal fade" id="Register_Modal" role="dialog" aria-labelledby="Register_ModalLabel" aria-hidden="true">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="Register_ModalLabel">Let's get registered!</h5>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">
<h1>Register</h1>
{% from "includes/_formhelpers.html" import render_field %}
<form method="POST" action="">
<div class="form-group">
{{render_field(form.name, class_="form-control")}}
</div>
<div class="form-group">
{{render_field(form.email, class_="form-control")}}
</div>
<div class="form-group">
{{render_field(form.username, class_="form-control")}}
</div>
<div class="form-group">
{{render_field(form.password, class_="form-control")}}
<p>Your Password is required to be 6 characters long, a strong password is suggested. Please see the example below</p>
<p>Ex: Th1s1s@cceptabl3!</p>
</div>
<div class="form-group">
{{render_field(form.confirm, class_="form-control")}}
</div>
<p><input type="submit" class="btn btn-outline-success" value="Submit"></p>
<button type="button" class="btn btn-outline-danger" data-dismiss="modal">No, I changed my mind!</button>
</form>
</div>
<div class="modal-footer justify-content-between">
<div mr-auto> Already a member? <a href="#" data-toggle="modal" data-target="#Login_Modal" data-dismiss="modal"> Sign in here!</a></div>
</div>
</div>
</div>
<li class="nav-item mr-auto">
<!-- Login Modal Button -->
<button type="button" class="btn btn-outline-light" data-toggle="modal" data-target="#Login_Modal"><i class="fas fa-sign-in-alt"></i>
Login
</button>
<!-- Modal -->
<div class="modal fade" id="Login_Modal" role="dialog" aria-labelledby="Login_ModalLabel" aria-hidden="true">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="Login_ModalLabel">Ready to log in?</h5>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">
<form action="" method="POST">
<div class="form-group">
<label>Username</label>
<input type="text" name="username" required placeholder="JSmith" autofocus="autofocus" class="form-control" value={{request.form.username}}>
</div>
<div class="form-group">
<label>Password</label>
<input type="password" name="password" required class="form-control" value={{request.form.password}}>
</div>
<button type="submit" class="btn btn-outline-success">Login!</button>
<button type="button" class="btn btn-outline-danger" data-dismiss="modal">Not right now</button>
</form>
</div>
<div class="modal-footer justify-content-between">
<div mr-auto> Not a member? <a href="#" data-toggle="modal" data-target="#Register_Modal" data-dismiss="modal"> Sign up here!</a></div>
</div>
</div>
</div>
</div>
</li>
{% endif %}
</ul>
</div>
</nav>
И вот ошибка, которую я получаю:
jinja2.exceptions.UndefinedError
jinja2.exceptions.UndefinedError: 'form' is undefined
Traceback (most recent call last)
File "C:\ProgramData\CooperConda\lib\site-packages\flask\app.py", line 2463, in __call__
return self.wsgi_app(environ, start_response)
File "C:\ProgramData\CooperConda\lib\site-packages\flask\app.py", line 2449, in wsgi_app
response = self.handle_exception(e)
File "C:\ProgramData\CooperConda\lib\site-packages\flask\app.py", line 1866, in handle_exception
reraise(exc_type, exc_value, tb)
File "C:\ProgramData\CooperConda\lib\site-packages\flask\_compat.py", line 39, in reraise
raise value
File "C:\ProgramData\CooperConda\lib\site-packages\flask\app.py", line 2446, in wsgi_app
response = self.full_dispatch_request()
File "C:\ProgramData\CooperConda\lib\site-packages\flask\app.py", line 1951, in full_dispatch_request
rv = self.handle_user_exception(e)
File "C:\ProgramData\CooperConda\lib\site-packages\flask\app.py", line 1820, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "C:\ProgramData\CooperConda\lib\site-packages\flask\_compat.py", line 39, in reraise
raise value
File "C:\ProgramData\CooperConda\lib\site-packages\flask\app.py", line 1949, in full_dispatch_request
rv = self.dispatch_request()
File "C:\ProgramData\CooperConda\lib\site-packages\flask\app.py", line 1935, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "C:\Users\tlquickl\devel\MyFlaskApp\app.py", line 61, in index
return render_template('home.html', error=error)
File "C:\ProgramData\CooperConda\lib\site-packages\flask\templating.py", line 140, in render_template
ctx.app,
File "C:\ProgramData\CooperConda\lib\site-packages\flask\templating.py", line 120, in _render
rv = template.render(context)
File "C:\ProgramData\CooperConda\lib\site-packages\jinja2\asyncsupport.py", line 76, in render
return original_render(self, *args, **kwargs)
File "C:\ProgramData\CooperConda\lib\site-packages\jinja2\environment.py", line 1008, in render
return self.environment.handle_exception(exc_info, True)
File "C:\ProgramData\CooperConda\lib\site-packages\jinja2\environment.py", line 780, in handle_exception
reraise(exc_type, exc_value, tb)
File "C:\ProgramData\CooperConda\lib\site-packages\jinja2\_compat.py", line 37, in reraise
raise value.with_traceback(tb)
File "C:\Users\tlquickl\devel\MyFlaskApp\templates\home.html", line 1, in top-level template code
{% extends 'layout.html' %}
{% block body %}
<div class="center">
<div class="jumbotron text-center">
<h1>Welcome to My FlaskApp</h1>
File "C:\Users\tlquickl\devel\MyFlaskApp\templates\layout.html", line 23, in top-level template code
<script type="text/javascript">
CKEDITOR.replace('editor')
</script>
{% include 'includes/_navbar.html' %}
<div class="container">
{% include 'includes/_messages.html' %}
{% block body %}{% endblock %}
</div>
<script>
File "C:\Users\tlquickl\devel\MyFlaskApp\templates\includes\_navbar.html", line 100, in top-level template code
<div class="modal-body">
<h1>Register</h1>
{% from "includes/_formhelpers.html" import render_field %}
<form method="POST" action="">
<div class="form-group">
{{render_field(form.name, class_="form-control")}}
</div>
<div class="form-group">
{{render_field(form.email, class_="form-control")}}
</div>
<div class="form-group">
File "C:\ProgramData\CooperConda\lib\site-packages\jinja2\environment.py", line 430, in getattr
return getattr(obj, attribute)
jinja2.exceptions.UndefinedError: 'form' is undefined
The debugger caught an exception in your WSGI application. You can now look at the traceback which led to the error.
To switch between the interactive traceback and the plaintext one, you can click on the "Traceback" headline. From the text traceback you can also create a paste of it. For code execution mouse-over the frame you want to debug and click on the console icon on the right side.
You can execute arbitrary Python code in the stack frames and there are some extra helpers available for introspection:
dump() shows all variables in the frame
dump(obj) dumps all that's known about the object
Brought to you by DON'T PANIC, your friendly Werkzeug powered traceback interpreter.
Я ожидаю получить сообщение об ошибке ивернуться на домашнюю страницу, но вместо этого я получаю сообщение об ошибке.Я использую Flask, SQLAlchemy и WTForms.
Любая помощь очень ценится!