Pass a variable (filename or message) to the template (frontend) after file uploaded #41
Description
Hello. I'm unable to pass a variable to a template after a file upload. The code is modified basic example:
index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Flask-Dropzone Demo: Basic</title>
{{ dropzone.load_css() }}
{{ dropzone.style('border: 2px dashed #0087F7; margin: 10%; min-height: 400px;') }}
</head>
<body>
{{ dropzone.create(action='upload') }}
{{ dropzone.load_js() }}
{{ dropzone.config() }}
{% if message %}
<p>{{message}}</p>
{% endif %}
</body>
</html>
and the Python side
app.py
import os
from flask import Flask, render_template, request
from flask_dropzone import Dropzone
basedir = os.path.abspath(os.path.dirname(__file__))
app = Flask(__name__)
app.config.update(
UPLOADED_PATH=os.path.join(basedir, 'uploads'),
# Flask-Dropzone config:
DROPZONE_ALLOWED_FILE_CUSTOM=True,
DROPZONE_ALLOWED_FILE_TYPE='.csv',
DROPZONE_MAX_FILE_SIZE=3,
DROPZONE_MAX_FILES=30,
DROPZONE_REDIRECT_VIEW='upload' # set redirect view
)
dropzone = Dropzone(app)
@app.route('/', methods=['POST', 'GET'])
def upload():
message = None
print(request.method, request.files)
if request.method == "POST":
# do something with the file ...
message = "done processing file"
return render_template('index.html', message=message)
if __name__ == '__main__':
app.run(debug=True)
But no 'message' is rendered. Basically the problem is that the only time the backend sees the uploaded file is when the request method is POST, but then for some reason the message=message argument does not work - nothing changes on the webpage.
The only way to pass a variable to a template is when the request method is GET but then the backend does not see the uploaded file...
Any ideas how to solve this?