Sending 2 dimensional array through formData using jQuery ajax to python flask

Question

I have a form which I need to add some variables to before sending it to the server which is python flask. I used the following code to send the form which works fine except when sending 2 dimensional array it will treat it as 1 dimensional in flask

javascript:

form = document.getElementById('calculator-form');
fdata = new FormData(form);
fdata.append('readings', plotData.readings);
$.ajax({
    url: "some/url/",
    type: 'POST',
    data: fdata,
    processData: false,
    contentType: false,
});

so if plotData.readings=[[1,2,3],[4,5,6]] I receive it in flask 1,2,3,4,5,6 and I don't always know the size of the array to reshape it from flask, is there a way to send so that the backend see it as 2 dimensional array?

Try fdata.append('readings', JSON.stringify(plotData.readings)); for sending, then you'll have to decode JSON, I'm not familiar with Python, but I'm sure there is a simple way to do it, JSON is a very popular format. — Walk
– Walk, Commented Oct 4, 2017 at 11:45
Thanks a lot, I thought there was a straight forward way without having to convert to json and converting back to list in python but this looks good for my current situation. — Farahats9
– Farahats9, Commented Oct 4, 2017 at 12:07

pciang · Accepted Answer · 2017-10-04 12:28:29Z

1

You can send plotData.readings as stringified JSON with JSON.stringify(plotData.readings) in Javascript. Then, in your Python app:

import json

json.loads(request.POST["readings"], encoding="utf-8") # Just an example

answered Oct 4, 2017 at 12:28

pciang

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