Hi,
Im new to Ajax and trying to validate my form fields using client-side script and Ajax. Ajax is used to check if the fieldValue already exists .

I want to return a value from the Ajax and use it to validate my form element.

var returnResult = validateUsingAJAX(tableFieldId,f.fieldValue[i].value,i) ;

function validateUsingAJAX(tableFieldId,val,indexValue){
var xmlHttpRequest=init();
xmlHttpRequest.open("GET", "/validateName.jsp?fieldValue="+val+"&tableFieldId="+tableFieldId, true);
xmlHttpRequest.onreadystatechange=function() {alertContents(xmlHttpRequest)};
xmlHttpRequest.send(null)
}

function init(){
if (window.XMLHttpRequest) {
return new XMLHttpRequest();
} else if (window.ActiveXObject) {
return new ActiveXObject("Microsoft.XMLHTTP");
}
}

The function alertContents returns well the result "true" or "false".But when i return the res,nothing happens in the calling script ,coz its always undefined.

function alertContents(xmlHttpRequest){
if(xmlHttpRequest.readyState==4){
if(xmlHttpRequest.status==200){
var res = xmlHttpRequest.responseText; return res;
}
}
}