Retrieve input value from form in html and use it in flask

Question

So, I need to grab an input value from an html form and use it in flask. Here's an example of python and html for reference:

python:

@app.route("/post_field", methods=["GET", "POST"])

def need_input():

    for key in request.form["post_field"]:    

        if key == "value1":
            #do the thing I want#

html:

<form action="/post_field" method="post">
    <input type="hidden" name="this_name" value="value1" />
    <input type="submit" value="Press Me!"/>
</form>

I get a 400 error when I click that Press Me input.

What port is your development server running on?

Kyle
– Kyle

2017-09-17 06:27:59 +00:00
Commented Sep 17, 2017 at 6:27 — Kyle
– Kyle, Commented Sep 17, 2017 at 6:27
@Kyle, localhost:5000

nyc_arts
– nyc_arts

2017-09-17 07:12:23 +00:00
Commented Sep 17, 2017 at 7:12 — nyc_arts
– nyc_arts, Commented Sep 17, 2017 at 7:12

Kyle · Accepted Answer · 2017-09-17 15:02:07Z

3

This seems to be working for me. I can access the form data via request.form that functions like a dictionary. You can iterate over the form key, values with request.form.items() (assuming it's python3).

app.py

from flask import Flask, request

app = Flask(__name__)

@app.route("/post_field", methods=["GET", "POST"])
def need_input():
    for key, value in request.form.items():
        print("key: {0}, value: {1}".format(key, value))

@app.route("/form", methods=["GET"])
def get_form():
    return render_template('index.html')

templates/index.html

<html>
<head>
</head>
<body>
  <form action="/post_field" method="post">
    <input type="hidden" name="this_name" value="value1" />
    <input type="submit" value="Press Me!"/>
    </form>
</body>
</html>

edited Sep 17, 2017 at 15:02

answered Sep 17, 2017 at 6:33

Kyle

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