html - loading, getting and manipulating data from a csv file in Python flask

Question

This question already has answers here: question from:https://stackoverflow.com/questions/65643407/loading-getting-and-manipulating-data-from-a-csv-file-in-python-flask

Answer 1

For your form tag, generate the action attribute with url_for which needs to match the view function which handles the post request. Also you can't have a spaces in multipart/form-data, and the request method should be POST:

<form name="controlEsits" action="{{url_for('inserimentoDBEsiti')}}" method="POST" enctype="multipart/form-data">

Take the formaction attribute out of the submit button:

<input class="btn" type="submit" value="Upload Results from File" id="btncheck">

Also in the flask app, the key of request.files needs to match the name attribute of the file input cell, so where you have:

<input type="file" id="file" name="FileN" accept="results/csv">

It's then read with:

file = request.files["FileN"]

Notice the case sensitivity, you had request.files["fileN']

I'd be careful with all the extra spaces in your HTML particularly within attributes.