duda de CARGANDO... con Ajax

[dleal100]

TIENES QUE COMPROBAR EL ESTADO XXDD
ACA TE MODIFIQUE TU CODIGO PARA QUE DIGA QUE ESTA CARGANDO XD

Código:

var http_request = false;
function makePOSTRequest(url, parameters, funcion) {
  http_request = false;
  if (window.XMLHttpRequest) { // Mozilla, Safari,...
     http_request = new XMLHttpRequest();
     if (http_request.overrideMimeType) {
        // set type accordingly to anticipated content type
        //http_request.overrideMimeType('text/xml');
        http_request.overrideMimeType('text/html');
     }
  } else if (window.ActiveXObject) { // IE
     try {
        http_request = new ActiveXObject("Msxml2.XMLHTTP");
     } catch (e) {
        try {
           http_request = new ActiveXObject("Microsoft.XMLHTTP");
        } catch (e) {}
     }
  }
  if (!http_request) {
     alert('Cannot create XMLHTTP instance');
     return false;
  }
  
  http_request.onreadystatechange = funcion;
  http_request.open('POST', url, true);
  http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
  http_request.setRequestHeader("Content-length", parameters.length);
  http_request.setRequestHeader("Connection", "close");
  http_request.send(parameters);
}
 
function alertContents() {
  if (http_request.readyState == 4 && http_request.status == 200)  {
     
        //alert(http_request.responseText);
        result = http_request.responseText;
        document.getElementById('div').innerHTML = result;            
      
  }else{document.getElementById('div').innerHTML = "cargando...";}
}
 
function get() {
  var poststr = "codigo=" + encodeURI( document.getElementById("producto_id").value );
  makePOSTRequest('generar_producto.php', poststr, alertContents);
}