Passing arguments url_for Python

Question

I have two def for creating question and previewing question.

I want to pass a question's ID from def create() to def preview(). But the def preview() cannot realize the ID.

I have try using return redirect(url_for('preview', question_id=question_id)) and in my def preview() I used question_id = request.args.get('question_id',type=str).

How can I fix that?

My code is here:

@app.route("/create/", methods=['GET','POST'])
def create():
    question = "How are you?"
    question_id = "123456"
    return redirect(url_for('preview'), question_id=question_id)

@app.route("/preview/", methods=['GET','POST'])
def preview():
    question_id = request.args.get('question_id', type=str)
    print(question_id)

By the way, you're passing question_id param to the url_for function instead of redirect. Please correct to : redirect(url_for('preview'), question_id=question_id) — Flo
– Flo, Commented Dec 17, 2019 at 13:35
It should show me the ID on the page but it just show me a blank page! — Khang Thinh Nguyen
– Khang Thinh Nguyen, Commented Dec 17, 2019 at 13:36

Flo · Accepted Answer · 2019-12-17 13:46:55Z

1

In the preview route, you're doing print(question_id) which won't write or render anything to a page, it will only print the value to your console (stdout), that's all.

Try with render_template_string like so :

from flask import render_template_string

[...]



@app.route("/preview/", methods=['GET','POST'])
def preview():
    question_id = request.args.get('question_id', type=str)
    return render_template_string('question_id = {{ question_id }}', question_id=question_id)

Hope it helps.

answered Dec 17, 2019 at 13:46

Flo

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