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

python html flask

12,349

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>

12,349

Author by

nyc_arts

Updated on June 04, 2022

Comments

nyc_arts almost 2 years

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.

Kyle over 6 years

What port is your development server running on?
nyc_arts over 6 years

@Kyle, localhost:5000

nyc_arts over 6 years

perfect! I had thought there was a dictionary involved in there somewhere but didn't know about form.items() with which to grab them. Thank you!
Kyle over 6 years

No problem at all! Glad we could get it figured out.