Error passing dynamically generated layer name to stateChanged()

[ericaalicen]

I am a newbie to Ajax. I modified the script below to use 3 variables instead of 1. The first two I have managed to successfully append to the url of the page being called in the script. The third variable I need to pass from showParts() to stateChanged() but when I try to pass it it gives me a readystate error. I need to be able to pass a dynamically generated layer name.

var xmlHttp

function showParts(str,year,divname)
{ 
var url="getParts.cfm?pid=" + str + "&carYear=" + year
xmlHttp=GetXmlHttpObject(stateChanged)
xmlHttp.open("GET", url , true)
xmlHttp.send(null)
} 

function stateChanged() 
{ 
if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
{ 
document.getElementById("txtHint").innerHTML=xmlHttp.responseText 
} 
} 

function GetXmlHttpObject(handler)
{ 
var objXmlHttp=null

if (navigator.userAgent.indexOf("Opera")>=0)
{
alert("This example doesn't work in Opera") 
return 
}
if (navigator.userAgent.indexOf("MSIE")>=0)
{ 
var strName="Msxml2.XMLHTTP"
if (navigator.appVersion.indexOf("MSIE 5.5")>=0)
{
strName="Microsoft.XMLHTTP"
} 
try
{ 
objXmlHttp=new ActiveXObject(strName)
objXmlHttp.onreadystatechange=handler 
return objXmlHttp
} 
catch(e)
{ 
alert("Error. Scripting for ActiveX might be disabled") 
return 
} 
} 
if (navigator.userAgent.indexOf("Mozilla")>=0)
{
objXmlHttp=new XMLHttpRequest()
objXmlHttp.onload=handler
objXmlHttp.onerror=handler 
return objXmlHttp
}
}

The above example is w/out passing the third variable. Below is how I've been trying to pass it.

var xmlHttp

function showParts(str,year,divname)
{ 
var url="getParts.cfm?pid=" + str + "&carYear=" + year
xmlHttp=GetXmlHttpObject(stateChanged(divname))
xmlHttp.open("GET", url , true)
xmlHttp.send(null)
} 

function stateChanged(div) 
{ 
if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
{ 
document.getElementById(div).innerHTML=xmlHttp.responseText 
} 
} 

function GetXmlHttpObject(handler)
{ 
var objXmlHttp=null

if (navigator.userAgent.indexOf("Opera")>=0)
{
alert("This example doesn't work in Opera") 
return 
}
if (navigator.userAgent.indexOf("MSIE")>=0)
{ 
var strName="Msxml2.XMLHTTP"
if (navigator.appVersion.indexOf("MSIE 5.5")>=0)
{
strName="Microsoft.XMLHTTP"
} 
try
{ 
objXmlHttp=new ActiveXObject(strName)
objXmlHttp.onreadystatechange=handler 
return objXmlHttp
} 
catch(e)
{ 
alert("Error. Scripting for ActiveX might be disabled") 
return 
} 
} 
if (navigator.userAgent.indexOf("Mozilla")>=0)
{
objXmlHttp=new XMLHttpRequest()
objXmlHttp.onload=handler
objXmlHttp.onerror=handler 
return objXmlHttp
}
}

I'm totally stuck and out of ideas. I appreciate any help or guidance here.

 

[ericaalicen]

This is the error I'm getting when passing the third variable:

xmlHttp.readystate is null or not an object