JS polling

trad_polling.js

setInterval(function(){
    $.ajax({ url: "server", success: function(data){
        //Update your dashboard gauge
        salesGauge.setValue(data.value);
    }, dataType: "json"});
}, 30000);

(function poll(){
   setTimeout(function(){
      $.ajax({ url: "server", success: function(data){
        //Update your dashboard gauge
        salesGauge.setValue(data.value);

        //Setup the next poll recursively
        poll();
      }, dataType: "json"});
  }, 30000);
})();

// LONG POLLING
(function poll(){
    $.ajax({ url: "server", success: function(data){
        //Update your dashboard gauge
        salesGauge.setValue(data.value);

    }, dataType: "json", complete: poll, timeout: 30000 });
})();