Getdata from database file of user details form-Java script

function getData()
{
var userid =document.getElementById('cboUser').value;
if(userid!='')
{
var url ="user_db.php?id=getdata";
url+="&userid="+userid;

var htmlhttp_obj  = $.ajax({url:url,async:false});

var XMLintUserNo = htmlhttp_obj.responseXML.getElementsByTagName("intUserNo");
document.getElementById('txtUserNo').value = XMLintUserNo[0].childNodes[0].nodeValue;

var XMLusername=htmlhttp_obj.responseXML.getElementsByTagName("username");
document.getElementById('txtUserName').value =XMLusername[0].childNodes[0].nodeValue;

var XMLstrTitle=htmlhttp_obj.responseXML.getElementsByTagName("strTitle");
document.getElementById('cboTitle').value =XMLstrTitle[0].childNodes[0].nodeValue;

var XMLstrFirst = htmlhttp_obj.responseXML.getElementsByTagName("strFirst");
document.getElementById('txtFirstName').value = XMLstrFirst[0].childNodes[0].nodeValue;

var XMLstrLast=htmlhttp_obj.responseXML.getElementsByTagName("strLast");
document.getElementById('txtLastName').value =XMLstrLast[0].childNodes[0].nodeValue;

var XMLstrDesignation=htmlhttp_obj.responseXML.getElementsByTagName("strDesignation");
document.getElementById('cboDesignation').value =XMLstrDesignation[0].childNodes[0].nodeValue;

var XMLstrNic=htmlhttp_obj.responseXML.getElementsByTagName("strNic");
document.getElementById('txtNicNo').value =XMLstrNic[0].childNodes[0].nodeValue;

var XMLstrGender=htmlhttp_obj.responseXML.getElementsByTagName("strGender");
document.getElementById('cboGender').value =XMLstrGender[0].childNodes[0].nodeValue;

var XMLdtmDate = htmlhttp_obj.responseXML.getElementsByTagName("dtmDate");
document.getElementById('txtDateofbirth').value = XMLdtmDate[0].childNodes[0].nodeValue;

var XMLemail=htmlhttp_obj.responseXML.getElementsByTagName("email");
document.getElementById('txtEmailAddress').value =XMLemail[0].childNodes[0].nodeValue;

var XMLstrAdd1 = htmlhttp_obj.responseXML.getElementsByTagName("strAdd1");
document.getElementById('txtAddress1').value = XMLstrAdd1[0].childNodes[0].nodeValue;

var XMLstrAdd2=htmlhttp_obj.responseXML.getElementsByTagName("strAdd2");
document.getElementById('txtAddress2').value =XMLstrAdd2[0].childNodes[0].nodeValue;

var XMLstrAdd3=htmlhttp_obj.responseXML.getElementsByTagName("strAdd3");
document.getElementById('txtAddress3').value =XMLstrAdd3[0].childNodes[0].nodeValue;

var XMLintTele=htmlhttp_obj.responseXML.getElementsByTagName("intTele");
document.getElementById('txtTelNo').value =XMLintTele[0].childNodes[0].nodeValue;



}

else
{
document.getElementById('txtUserNo').value = "";
document.getElementById('txtUserName').value = "";
document.getElementById('txtPassword').value = "";
document.getElementById('cboTitle').value = "";
document.getElementById('txtFirstName').value = "";
document.getElementById('txtLastName').value = "";
document.getElementById('cboDesignation').value = "";
document.getElementById('txtNicNo').value = "";

document.getElementById('cboGender').value = "";
document.getElementById('txtDateofbirth').value = "";
document.getElementById('txtEmailAddress').value = "";
document.getElementById('txtAddress1').value = "";
document.getElementById('txtAddress2').value = "";
document.getElementById('txtAddress3').value = "";
document.getElementById('txtTelNo').value = "";


}


}