XmlHttpRequest.onload not called

Question

I\'m playing around with this XmlHttpRequest thing. In some tutorials and books, it is the onload function the one that is called when the request is d

Answer 1

IE has different method to create xmlhttprequest.

function createCORSRequest(method, url) {
  var xhr = new XMLHttpRequest();
  if ("withCredentials" in xhr) {

    // Check if the XMLHttpRequest object has a "withCredentials" property.
    // "withCredentials" only exists on XMLHTTPRequest2 objects.
    xhr.open(method, url, true);

  } else if (typeof XDomainRequest != "undefined") {

    // Otherwise, check if XDomainRequest.
    // XDomainRequest only exists in IE, and is IE's way of making CORS requests.
    xhr = new XDomainRequest();
    xhr.open(method, url);

  } else {

    // Otherwise, CORS is not supported by the browser.
    xhr = null;

  }
  return xhr;
};

same this article:https://www.html5rocks.com/en/tutorials/cors/