flask wtforms populating drop down list

Question

this isn't a very specific question, so sorry in advance.

I have a folder called Crews, and it contains json files.

I'm using WTForms to create a drop down list, and I want the list to be populated with the names of the json files within that folder, but I don't know how to go about this.

(I'm creating a web app that visualizes the chosen json data, so the form will contain a function that returns the chosen json data, which is called by the d3.js code)

score 9 · Accepted Answer · edited May 13 '18 at 18:20

9

Use this to get all the files in your directory:

How do I list all files of a directory?

Once you get that list of json files, you can use it to populate the choices in a WTForms SelectField

from flask.ext.wtf import Form
from wtforms import SelectField

filenames = ['1.json', '2.json'] # This will be generated by you
class MyForm
    json_file = SelectField(u"Filename", [Optional()], choices=[(f, f) for f in filenames])

edited May 13 '18 at 18:20

Iron Fist

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answered Mar 20 '15 at 15:11

Adam Steele

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I upvoted you, but what is the '[Optional()]' parameter? – NYCeyes May 12 '15 at 21:10
Should have post url reference to WTForms! – Iron Fist May 13 '18 at 18:18
Very late to the party but Optional() is a validator, that keeps the selection of the tag optional – Anshuman Kumar Jan 17 '20 at 06:36

flask wtforms populating drop down list

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