Alert box Undefined

[gowthamkg]

My alert box gives "undefined' when i return some 'true or false'.Please solve my problem

[DrBunchman]

Hi gowthamkg,

Can you show us the code you are using please.

Thanks,

Dr B

[gowthamkg]

alert(frmregistration('EmailId'));
	if(frmregistration('EmailId')==false)
	{

		return false;
	}


function frmregistration(sValidateUserAndEmailId)
{

	var xmlHttp;
	try
  {
  // Firefox, Opera 8.0+, Safari
  xmlHttp=new XMLHttpRequest();
  }
catch (e)
  {
  // Internet Explorer
  try
    {
    xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
    }
  catch (e)
    {
    try
      {
      xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
      }
    catch (e)
      {
      alert("Your browser does not support AJAX!");
      return false;
		 }
		}
	}

	//get user entered city name
	var txtname=document.getElementById('txtuname').value;
	var strEmail=document.getElementById('txtemail').value;
	if(sValidateUserAndEmailId=='ValidateUserName')
	{
	    xmlHttp.open("GET","CommonHTTP.asp?name="+ txtname,true);
	}
	else if(sValidateUserAndEmailId=='EmailId')
	{
	    
	    xmlHttp.open("GET","CommonEmailHTTP.asp?EmailId="+ strEmail,true);
	}
	
	xmlHttp.send();
	xmlHttp.onreadystatechange=function()
	{
	 //if request has been entertained and response is returned from server
	 if(xmlHttp.readyState==4)
	 {
	  //document.getElementById('dvweather').innerHTML=xmlHttp.responseText;
	  //alert(xmlHttp.responseText);
	  if(xmlHttp.responseText=="Failed")
	  {
	    if(sValidateUserAndEmailId =='ValidateUserName')
		    {
				alert("This user already exist");
				
			}
		else if(sValidateUserAndEmailId =='EmailId')
		    {
				alert("This Email already exist");
			}
		return false;
	  }
	  else
	  {
	    if(sValidateUserAndEmailId =='ValidateUserName')
	    {
			alert("This user Does not exist");
		}
		return true;
		//document.registration.action="CommonHTTP.asp";
	  }
	 }
	}
	
}

[DrBunchman]

gowthamkg,

Please don't forget to wrap your code in CODE tags - it makes your posts much easier to read - and please read the Posting Guidelines if you have not done so already.

Which alert box is causing you the problem?

Dr B

[gowthamkg]

alert(frmregist ration('EmailId '));.actually this function comes bottom, i have just added in the starting.

[JamieHowarth0]

Hi guys,

This thread has been moved to the Javascript forum as it is not a classic ASP-related question.

Many thanks,

codegecko
Moderator

[acoder]

The frmregistration function makes an Ajax request which is asynchronous and the callback function does the alerting anyway. So there's no need for an alert. Just call frmregistration instead.