Ajax problem while loading option.

Hi All,

I wanted to load option collection from database using javascript in ajax way. for that i created the xml from back end in my action class as shown below.
response.setContentType("text/xml");
response.setHeader("Cache-Control", "no-cache");

PrintWriter out = response.getWriter();

DomainFormGetDAO dao1 = new DomainFormGetDAO();

String buffer = dao1.getXmlData();
if(buffer.equals("") == false)
out.write(buffer);
else{
System.out.println("buffer is null---"+buffer);
}
return(null);
and in my js code is
function processRequest() {
if (req.readyState == 4) {
if (req.status == 200) {
// Building a DOM parser from Response Object
var response = req.responseXML.documentElement

//var message = req.responseXML.getElementsByTagName("hello")[0].childNodes[0].nodeValue;
var x = response.getElementsByTagName("option")
var val
var tex
var optn
alert(" XML size"+x.length)
for(var i = 0;i < x.length; i++){

optn = document.createElement("OPTION")
var er
// Checking for the tag which holds the value of the Drop-Down combo element
val = x[i].getElementsByTagName("val")
{
try{
// Assigning the value to a Drop-Down Set Element
optn.value = val[0].firstChild.data
} catch(er){
}
}
// Checking for the tag which holds the Text of the Drop-Down combo element
tex = x[i].getElementsByTagName("text")
{
try{
// Assigning the Text to a Drop-Down Set Element
optn.text = tex[0].firstChild.data
} catch(er){
}
}
// Adding the Set Element to the Drop-Down

document.form.selectedDomain.options.add(optn)
}
}else{

alert("Problem retrieving XML data")
}

}
and i m jsp is

<td align="left" bgcolor="#F3F3F3" class="smallwhitetext"><html:select property="selectedDomain" > <html

ption value="-1">pick one</html

ption>
</html:select>
</td>

but when i run my jsp i alway get 'xmlhttp' is undefined.
and my dropdown is alway blank.

Please help me.Thanks in advance

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bear
JavaRanch Sheriff

I got that my xml string is not getting forwarded to jsp.
Is there any problem in my above mentioned action.Please help.

I have to assume that your error message ('xmlhttp' is undefined) is coming from JavaScript other than what you have posted. Post your code where 'xmlhttp' is referenced and maybe somebody could help.

- Brent