CODEWITHSUNDEEP
pythonflaskjinja2
user2426062
user2426062

Reputation: 109

How do I respond to a get request with Flask?

How do I respond to a get request with Flask? I found nothing in the documentation, I find it hard to understand, I've also searched online and found nothing.

I have a form here's part of the code:

<input type="radio" name="topic" value="{{ topic }}" id="{{ topic }}" onclick="submit()">

Now as you can see from this, the input sends the value of 'topic' when submitted.

How can I use Flask to respond to any GET request like that input? Something like this:

@app.route('/topic/[any 'topic' value from form]', methods=['GET'])
def topic():
    topic = request.form['topic']
    return render_template('topic.html', topic=topic)

Thanks.

UPDATE:

So I decided to use post as suggested. I tried to test post with this code:

@app.route('/topic/', methods=['POST'])
def topic():
    chosenTopic = request.form['chosenTopic']
    return render_template('topic.html', chosenTopic=chosenTopic)

and this form:

<input type="radio" name="chosenTopic" value="{{ topic[3:topic|length-4:] }}" id="chosenTopic" onclick="submit()">

I tested it out on the /topic page with a simple {{ chosenTopic }} but nothing appears? Does anyone have any suggestions as to why?

Upvotes: 0

Views: 2948

Answers (1)

Paul Rooney
Paul Rooney

Reputation: 21609

Something like this shows a simple example.

from flask import Flask, request, redirect

app = Flask(__name__)

# really look in db here or do whatever you need to do to validate this as a valid topic.
def is_valid_topic(topic):
    if topic == "foo":
        return False
    else:
        return True

@app.route('/')
def index():
    return '<html><form action="topic/" method="post"><input name="topic" type="text"><input type="submit"/></form></html>'

@app.route('/topic/', methods=['POST'])
def find_topic():
    t = request.form['topic']
    if is_valid_topic(t):
        return redirect('topic/%s' % t)
    else:
        return "404 error INVALID TOPIC", 404

@app.route('/topic/<topic>')
def show_topic(topic):
    if is_valid_topic(topic):
        return '''<html><h1>The topic is %s</h1></html>''' % topic
    else:
        return "404 error INVALID TOPIC", 404

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

You accept the params in a POST request and redirect to the GET afterwards.

Upvotes: 2

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