Question

function get_request(url) {
  var request = new getXMLObject();
  request.onreadystatechange = function () {
    if (request.readyState == 4) {
      alert(request.responseText);
      var data = eval('(' + request.responseText + ')');
      alert(data);
      return data;
    }   
  }
  request.open("GET", url, true);
  //alert(document.getElementById('energy').innerHTML);
  request.send();
}

function loadjobs() {
  var url = "loadjobs.php?tab=1&id=1111";
  //var data=
  //alert(check());
  alert(get_request(url));
  //alert(data);
}

When i m getting data in json format…i am gettin NULL in alert(get_request(url));
while i m getting in alert(data);

Help me

Answer 1

This is because the request in asynchronous . The get_request(url) function does to return anything and hence the null ( although I think it should be undefined and not null ) .

The onreadystatechange function gets called later in the time , when the AJAX request has been completed and the data is returned from the server and hence the alert there works .