Q:

Django refresh page if change data by other user

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.

A:

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);

A:

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"?

