Django refresh page if change data by other user

Question

I have a test django app.

In one page the test show the same question to all users.

I'd like that when a user answers correctly, send a signal to other active user's browser to refresh to the next question.

I have been learning about signals in django I learning work with them but I don't now how send the "refresh signal" to client browser.

I think that it can do with a javascript code that check if a certain value (actual question) change and if change reload the page but I don't know this language and the information that I find was confused.

Can anybody help me?

Many Thanks.

Possible Duplicate: http://stackoverflow.com/questions/5479741/django-push-http-response-to-users — Spike, Nov 12 '11 at 17:40

score 5 · Accepted Answer · answered Nov 12 '11 at 17:47

5

There is no existing way to send a event from server to browser. But you can get your web page polling your server periodically (say every 5 seconds).

The code in javascript/jquery could be like the following

setInterval(function(){
    $.post("your_ajax_handler_url/is_answerd", userId, function(xhr){
       if(xhr.responseText == "answered"){
          location.reload(true);
       }  
    }
 }, 5000);

answered Nov 12 '11 at 17:47

ComfortablyNumb

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Thanks for the code. But I have a problem, I send the post with the info each 5 seconds but I don't get django view processed the post The breakpoint in pydev don't pass over it – Fran Sobrino Nov 13 '11 at 12:37
Auto response: you need add the decorator csrf_exempt – Fran Sobrino Nov 13 '11 at 12:51

score 3 · Answer 2 · edited May 23 '17 at 12:15

3

That is not at all what signals in Django are for. Signals in django are server side hooks that allow you perform tasks on the server when a certain even happens.

To 'send a refresh' to the browser, you need to use a server-push approach such as Comet. Alternatively you can get your clients to periodically poll the server to look for update.

Here's some links:

How to implement Server push / long polling / comet using PHP and Javascript

How do I implement basic "Long Polling"?

edited May 23 '17 at 12:15

Community

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answered Nov 12 '11 at 17:40

Timmy O'Mahony

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Thanks for the info. I've been read about comet but I think that it's too powerful to my proyect. I'll use the javascript optión to check updates. Many Thanks – Fran Sobrino Nov 13 '11 at 10:20

score -1 · Answer 3 · answered Nov 12 '11 at 17:49

-1

What you need are coment(http://en.wikipedia.org/wiki/Comet_%28programming%29) and tornado(http://www.tornadoweb.org/)

answered Nov 12 '11 at 17:49

LisztLi

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Django refresh page if change data by other user

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