CODEWITHSUNDEEP
pythonhtmlflaskjinja2wtforms
Sajeev Rajput
Sajeev Rajput

Reputation: 143

While creating web forms in Flask, I'm getting the error: jinja2.exceptions.UndefinedError: 'reviewform' is undefined

Here is the Flask code:

from flask import Flask, render_template
from wtforms import Form, TextAreaField

app = Flask(__name__)
app.config['SECRET_KEY'] = 'mysecretkey'

class ReviewForm(Form):
    reviewText = TextAreaField()

@app.route('/', methods=['GET', 'POST'])
def index():
    reviewform = ReviewForm()
    return render_template("review.html", form=reviewform)

if __name__ == '__main__':
    app.run(debug=True)

Here is the form template using Jinja2:

<!doctype html>
<html>
<head>
    <title>Review Page</title>
</head>
<body>
    <h1>Enter your review</h1>
    <form method="POST" action="{{ url_for('index') }}">
        {{ reviewform.csrf_token }}
        {{ reviewform.reviewText }}
    </form>
</body>
</html>

It appears that the object is properly defined and passed on the render_template(). I can't figure out why the error.

Here is the traceback:

Traceback (most recent call last):

  File "C:\Users\Default\AppData\Local\Continuum\Anaconda3\lib\site-packages\flask\app.py", line 1994, in __call__
    return self.wsgi_app(environ, start_response)
  File "C:\Users\Default\AppData\Local\Continuum\Anaconda3\lib\site-packages\flask\app.py", line 1985, in wsgi_app
    response = self.handle_exception(e)
  File "C:\Users\Default\AppData\Local\Continuum\Anaconda3\lib\site-packages\flask\app.py", line 1540, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "C:\Users\Default\AppData\Local\Continuum\Anaconda3\lib\site-packages\flask\_compat.py", line 33, in reraise
    raise value
  File "C:\Users\Default\AppData\Local\Continuum\Anaconda3\lib\site-packages\flask\app.py", line 1982, in wsgi_app
    response = self.full_dispatch_request()
  File "C:\Users\Default\AppData\Local\Continuum\Anaconda3\lib\site-packages\flask\app.py", line 1614, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "C:\Users\Default\AppData\Local\Continuum\Anaconda3\lib\site-packages\flask\app.py", line 1517, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "C:\Users\Default\AppData\Local\Continuum\Anaconda3\lib\site-packages\flask\_compat.py", line 33, in reraise
    raise value
  File "C:\Users\Default\AppData\Local\Continuum\Anaconda3\lib\site-packages\flask\app.py", line 1612, in full_dispatch_request
    rv = self.dispatch_request()
  File "C:\Users\Default\AppData\Local\Continuum\Anaconda3\lib\site-packages\flask\app.py", line 1598, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "C:\Users\Jimmy Valentine\PycharmProjects\SentimentAnalysis\SentimentAnalysis.py", line 16, in index
    return render_template("review.html", form=reviewform)
  File "C:\Users\Default\AppData\Local\Continuum\Anaconda3\lib\site-packages\flask\templating.py", line 134, in render_template
    context, ctx.app)
  File "C:\Users\Default\AppData\Local\Continuum\Anaconda3\lib\site-packages\flask\templating.py", line 116, in _render
    rv = template.render(context)
  File "C:\Users\Default\AppData\Local\Continuum\Anaconda3\lib\site-packages\jinja2\asyncsupport.py", line 76, in render
    return original_render(self, *args, **kwargs)
  File "C:\Users\Default\AppData\Local\Continuum\Anaconda3\lib\site-packages\jinja2\environment.py", line 1008, in render
    return self.environment.handle_exception(exc_info, True)
  File "C:\Users\Default\AppData\Local\Continuum\Anaconda3\lib\site-packages\jinja2\environment.py", line 780, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "C:\Users\Default\AppData\Local\Continuum\Anaconda3\lib\site-packages\jinja2\_compat.py", line 37, in reraise
    raise value.with_traceback(tb)
  File "C:\Users\Jimmy Valentine\PycharmProjects\SentimentAnalysis\templates\review.html", line 10, in top-level template code
    {{ reviewform.reviewText }}
  File "C:\Users\Default\AppData\Local\Continuum\Anaconda3\lib\site-packages\jinja2\environment.py", line 430, in getattr
    return getattr(obj, attribute)

jinja2.exceptions.UndefinedError: 'reviewform' is undefined

Upvotes: 0

Views: 602

Answers (1)

Bovarysme
Bovarysme

Reputation: 453

You are calling render_template with form=reviewform, which means reviewform will be accessible in the template under the name form. To fix the issue, you can either:

  • change the call to render_template,

    return render_template("review.html", reviewform=reviewform)

  • or modify your template to use form instead of reviewform.

    <form method="POST" action="{{ url_for('index') }}">
    {{ form.csrf_token }}
    {{ form.reviewText }}
</form>

Upvotes: 1

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