Is it possible to differentate between page refresh and close using the below method?

I want to open a popup window on closing the page and no开发者_JAVA技巧t during refresh of the page,

So what i am thinking to do is.

Clent

Send ajax request to server every x seconds.

Server

var timeout=0
var sec=0     
while (sec>timeout)

{

open popup window

sec++;
if(request){

sec=0
}

}

Assumption

Timeout will be the maximum delay between requests during page rfresh.

So my questions are:

1)Will this technique work?

2)If not Is there any other method to do it?

3)If It works what is optimal value for Timeout variable(in seconds)

4)How can i implement a small example in django is much appreciated.

Just think for a simple solution. Why are you going for the complex solution? The simple way to get popup on page close is to just define the "window.onunload" event as shown below.

window.onunload = function(){

//Code to display Popup

}

Hope this helps you.