javascript - Flask redirect(urlfor()) doesn't reload the page

I have a page with a button that makes a
ajax post to a
flask route. I'd like the route to compute a message
(simplified by hardcoding for the example) and passes it back to another route and
reloads the page the user is on. redirect(urlfor()) does call
the other route, but render_template seems not to be called as
the page doesn't
reload.

init.py

from
            flask import Flask, render_template, request, redirect, url_for

app
            = Flask(__name__)


@app.route('/second_route',
            methods=['POST'])
def second_route():
 print request.json

            return redirect(url_for('hello_world',
            message='test'))



@app.route('/')
def
            hello_world(message=None):
 return render_template('index.html',
            message=message)


app.run()

index.html

                        src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js">



            


{{ message
            }}

Answer

AJAX cannot handle a redirect response,
afaik. You could, though, encapsulate {{message}} in a
, identify the element, and do a
jQuery .html() to insert custom text upon AJAX completion
success.

$.ajax({
 type:
            "POST",
 contentType: "application/json; charset=utf-8",
 url:
            "/second_route",
 data: JSON.stringify({}),
 success:
            [],

 dataType: "json"
}).done(function(){

            $('#message').html('test');
 window.location.href =
            '/';
}).fail(function(response){

            $('#message').html(response['responseText']);
});

To
redirect, you'd replace the code inside the done clause with
window.location.href = "/someURL", but since the endpoint is
the same this isn't necessary. This way, using a message
variable at all wouldn't be necessary.