Python Flask get item from HTML select form

Question

Im having trouble getting anything from the shown HTML form

I always get "ValueError: View function did not return a response"

Can somebody help me out here please? I have tried every variation of request.get that I can find on the web. Also if I specify my form should use post it uses get anyway - anybody know why this is?

Im new to flask so forgive my ignorance!

Thanks in advance.

The python file (routes.py)

from flask import Flask, render_template, request
import os
app = Flask(__name__)     
musicpath = os.listdir(r"C:\Users\Oscar\Music\iTunes\iTunes Media\Music")
lsize = str(len(musicpath))
looper = len(musicpath)


@app.route('/')
def home():
    return render_template('home.html', lsize=20, looper=looper, musicpath=musicpath)

@app.route('/pop', methods=['POST', 'GET'])
def pop():
    if request.method == "GET":
      text = request.args.get('som')
      return text
      #Have tried every variation of request.get

@app.route('/about')
def about():
    name = "Hello!"
    return render_template('about.html', name=name)



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

The html file (home.html)

{% extends "layout.html" %}
{% block content %}
  <div class="jumbo">
    <h2>A Music app!<h2>
  </div>
  <div>
        {% if lsize %}
            <form action="/pop">
                <select id="som" size="20">
                {% for i in range(looper):%}
                    <option value="{{i}}">{{ musicpath[i] }}</option>
                {% endfor %}
                </select>
            </form>
        {% endif %}
    </div>
    <a href="{{ url_for('pop') }}">Select,</a>

{% endblock %}

Wombatz · Accepted Answer · 2020-01-03 19:36:08Z

3

The Problem is that your HTML form does not have a name. request.args.get("som") needs an HTML form input with the name "som"

<select name="som" id="som" size="20">

Just change that line and add a name. The form is not interested in the id attribute.

edited Jan 3, 2020 at 19:36

answered Feb 7, 2016 at 18:04

Wombatz

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1 Comment

user3788339 Over a year ago

Sorry I originally tried it with name and just did again - no change the errors the same

Menno Hölscher · Accepted Answer · 2016-02-07 20:49:09Z

0

Your form action is /pop. That means that if you submit the form it will do a POST request to the address /pop. Your code does only return a value for a GET request, therefore Flask complains you do not return anything. Write some code to process a POST request and return a text or rendered template.

BTW, in the code for GET you refer to request.args.get('som'); this gives you request arguments (i.e. in the URL), not from the form. som is in the form, so you cannot refer to it this way.

answered Feb 7, 2016 at 20:49

Menno Hölscher

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2 Comments

Wombatz Over a year ago

default methods for forms is GET and not POST link

Menno Hölscher Over a year ago

@ Wombatz Oi, my bad. That will teach me not to read code properly. Thanks for the correction.

Samuele · Accepted Answer · 2017-06-20 10:09:36Z

0

You don't specified the method of the form, you have to do it! For example use this<form method="POST action"/pop">

answered Jun 20, 2017 at 10:09

Samuele

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