Ejecutar una llamada Ajax cuando la ventana se cierre

[omarMusic]

Efectivamente

bueno para los que quieren la solución inestable que encontré, lo rescatable de dicha solución sería que window.onbeforeunload es cross-browser

Código Javascript:

var dont_confirm_leave = 0; //set dont_confirm_leave to 1 when you want the user to be able to leave withou confirmation
var leave_message = 'You sure you want to leave?'
          
window.onbeforeunload= function (e) {
      
  if(dont_confirm_leave!==1) {
    if(!e) e = window.event;
    //e.cancelBubble is supported by IE - this will kill the bubbling process.
    e.cancelBubble = true;
    e.returnValue = leave_message;
    //e.stopPropagation works in Firefox.
    if (e.stopPropagation) {
      e.stopPropagation();
      e.preventDefault();
    }
 
    // acá va la llamada ajax o código js
        
    //return works for Chrome and Safari
    return leave_message;
  }
};
 

Saludos!