What is the process for making an XHR request to a server located remotely

Do you think the code below is sufficient for XHRing a remote server? I tried putting the full server URL in the open method of the XHR object, but it didn't work. I'm not sure if something else needs to be added.

<script type="text/javascript">
function loadXMLDoc()
{
var xmlhttp;
if (window.XMLHttpRequest)
  {// code for IE7+, Firefox, Chrome, Opera, Safari
  xmlhttp=new XMLHttpRequest();
  }
else
  {// code for IE6, IE5
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
xmlhttp.onreadystatechange=function()
  {
  if (xmlhttp.readyState==4 && xmlhttp.status==200)
    {
    document.getElementById("myDiv").innerHTML=xmlhttp.responseText;
    }
  }
xmlhttp.open("GET","http://insertURLofRemoteServerHere.com?parameter1=true",true);
xmlhttp.send();
}
</script>
javascriptajaxxmlhttprequest

Answer №1

In the realm of Javascript, sending XHRs to a server is typically limited to the same origin from which the script was initially loaded. This restriction is commonly referred to as the Same Origin Policy. It seems likely that this policy could be the obstacle you are encountering.

Answer №2

Your code looks mostly correct and you've taken into account cross-browser compatibility. However, due to the Same Origin Policy, receiving a response from a script on a remote server may not be allowed.

One solution could be to use the JSON-P response format if the remote server supports it.

Alternatively, you can explore Cross Origin Resource Sharing (CORS), although its reliability can vary. I recommend going with JSON-P if possible based on my personal experience.

(On a side note: Consider using a library or framework like jQuery to simplify your life. With just a few lines of code, you can achieve the same functionality while ensuring cross-browser compatibility.)

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