Ajax no response

[Sahana Hegde]

Hi Guys,

 function GetXmlHttpObject(){
alert('here');
var xmlHttp=null;
try{
    xmlHttp=new XMLHttpRequest();}
catch (e){
   try{
    xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");}
  catch (e){
    xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");}
      }
      return xmlHttp;
}
function stateChanged() 
{ 
if (xmlHttp.readyState==4){ 
alert(xmlhttp.responseText);
}
}
function populateAuthorBox(){
alert(document.getElementById('intVendorID').selectedIndex);
var vendorId = document.getElementById('intVendorID').selectedIndex;
var xmlHttp = GetXmlHttpObject();
alert(xmlHttp);
if (xmlHttp==null){
  alert ("Your browser does not support AJAX!");
  return;
  } 
  //window.open("/ets/includes/FAW/_doAuthorAjaxDisplay.cfm?vendor_id="+vendorId);
  var url = "/ets/includes/FAW/_doAuthorAjaxDisplay.cfm?vendor_id="+vendorId;
  xmlHttp.onreadystatechange = stateChanged;
xmlHttp.open("GET",url,true);
xmlHttp.send(null);
}   

I am using this javascript. It is called onChange of a drop down. I also tried running the response page individually and it is running fine. In IE it gives an error xmlHttp is undefined. The statechanged is always 0.

What should I do?

Thanks

[Ulf Dittmer]

Hello "sarvagna"-

You've been around the ranch long enough to know that we have a policy on screen names here at JavaRanch. It must consist of a first name and a last name. Since yours does not conform with it, please take a moment to change it, which you can do right here.

As to your question, if there's an error about xmlHttp being undefined, it's not surprising that statechanged doesn't change, now is it? Which path through the GetXmlHttpObject method is the code taking? Does it work in other browsers?

[Sahana Hegde]

My apologies.

I have checked in Mozilla and IE. Does not work in both.

[Sahana Hegde]

I also checked if that path is opening up correctly by giving the same in window.open(url). Thats working correctly. I am using coldfusion to send the response.

 
 
<cfparam name="vendorId" default="#url.vendor_id#">
 
<cfquery name="Select" datasource="datasource_name">
SELECT vendor_name,vendor_address_1,vendor_phone
FROM dbo.t_ets_vendor where vendor_id = '#vendorId#'
</cfquery>
<cfoutput query="Select">
#vendor_name#,#vendor_address_1#,#vendor_phone#
</cfoutput>
 

[ August 08, 2008: Message edited by: Sahana Hegde ]

[Ulf Dittmer]

As I said, it doesn't matter whether the response works, if the request can't even be sent.

Again: Which path through the GetXmlHttpObject method is the code taking?

[Sahana Hegde]

When I use firefox it creates it comes here xmlHttp=new XMLHttpRequest();, does not work. If I use IE still it takes the same path.

[Eric Pascarello]

I am wondering if you have an issue with variable scope. Your var xmlHttp is local.

Eric

[Sahana Hegde]

Nope. I tried making it global. Same results.

[Eric Pascarello]

I just ran the code fine with a few changes [removed the indexof lines and changed the url], make sure you do not have any javascript errors being reported.

Eric

[K. Tsang]

Hi try putting the statechange function inside

 xmlHttp.onreadystatechange = function() { if (xmlHttp.readyState==4){ alert(xmlhttp.responseText);}};   

If you do get the alert great. If not check your url by simply printing the vendorId parm.

[Sahana Hegde]

Hi Guys,

For some reason,

    
var url = "/ets/includes/FAW/_doAuthorAjaxDisplay.cfm?vendor_id="+document.getElementById("hidden1").value;

this works perfectly.
But this does not

 
var vendorId = document.getElementById("hidden1").value;   
var url = "/ets/includes/FAW/_doAuthorAjaxDisplay.cfm?vendor_id="+vendorId;

Thanks

[Eric Pascarello]

Looks like there is no difference. Make sure you do not have a typo.

Eric