Get list Item Using ECMA Script

var context;
var collListItem;
var itemColl;
var controlPrefix = "";
var context1;
var collListItem1;
var itemColl11;
var controlPrefix = "";
var uservalue = "";
$(document).ready(function () {
    //debugger;
    //ExecuteOrDelayUntilScriptLoaded(getUserData, "sp.js");
    //    getEmplist();
});
function getUserEmpBasicData(user,listname) {
    debugger;
    //listname = "EmpBasicInfo";
    uservalue = user;
        context = new SP.ClientContext.get_current();

        list = context.get_web().get_lists().getByTitle(listname);
        if (listname == "TempEmpBasicInfo") {
            controlPrefix = "Old";
        }
        else {
            controlPrefix = "New";
        }
        var query1 = new SP.CamlQuery();
        var stryquery = "<View><Query><Where><Eq><FieldRef Name='Title' /><Value Type='Text'>" + user + "</Value></Eq></Where></Query></View>";

        query1.set_viewXml(stryquery);

        itemColl = list.getItems(query1);

        context.load(itemColl);
        context.executeQueryAsync(BasicretrieveListItemsSuccess, retrieveListItemsFail);
 
 

}
function BasicretrieveListItemsSuccess() {
    debugger;
    if (itemColl.get_count() > 0) {
        var listItemEnumerator = itemColl.getEnumerator();
        while (listItemEnumerator.moveNext()) {
            var oListItem = listItemEnumerator.get_current();
            var Title = oListItem.get_item('Title');
            var EmpID = oListItem.get_item('EmpID');
            var date = oListItem.get_item('DOB').getDate();
            var day = oListItem.get_item('DOB').getMonth();
            var Year = oListItem.get_item('DOB').getYear();
            var DOB = day + '/' + date + '/' + Year;
         
            var empFirstName = oListItem.get_item('First_x0020_Name');
            var empLastName = oListItem.get_item('Last_x0020_Name');
            var Designation = oListItem.get_item('Designation').get_lookupValue();
            var empGender = oListItem.get_item('Gender').get_lookupValue();
            var empEmailId = oListItem.get_item('VertexEmailID').get_lookupValue();
            var empDepartment = oListItem.get_item('Department').get_lookupValue();
            var empProfileTag = oListItem.get_item('ProfileTag');
            var profile = "";
            for (var i = 0; i < empProfileTag.length; i++) {
                var lookupObject = empProfileTag[i];

                profile += lookupObject.get_lookupValue() + ",";

            }
            profile = profile.substr(0, profile.length - 1) + '';
            var empResidencePhoneNumber = oListItem.get_item('ResidencePhoneNumber');
            var empPhone = oListItem.get_item('MobileNumber');
            var empExtensionNumber = oListItem.get_item('ExtensionNumber');
            var ICQNumber = oListItem.get_item('ICQNumber');
            Title = Title == null ? "" : Title;
            EmpID = EmpID == null ? "" : EmpID;
            empFirstName = empFirstName == null ? "" : empFirstName;
            empLastName = empLastName == null ? "" : empLastName;
            empPhone = empPhone == null ? "" : empPhone;
            ICQNumber = ICQNumber == null ? "" : ICQNumber;
            empEmailId = empEmailId == null ? "" : empEmailId;
            empExtensionNumber = empExtensionNumber == null ? "" : empExtensionNumber;
            empGender = empGender == null ? "" : empGender;
            empDepartment = empDepartment == null ? "" : empDepartment;
            profile = profile == null ? "" : profile;
            empResidencePhoneNumber = empResidencePhoneNumber == null ? "" : empResidencePhoneNumber;
            Designation = Designation == null ? "" : Designation;

            $("[id$=_lbl" + controlPrefix + "FirstName]").text(empFirstName);
            $("[id$=_lbl" + controlPrefix + "LastName]").text(empLastName);
            $("[id$=_lbl" + controlPrefix + "Department]").text(empDepartment);
            $("[id$=_lbl" + controlPrefix + "Designation]").text(Designation);
            $("[id$=_lbl" + controlPrefix + "DOB]").text(DOB);
            $("[id$=_lbl" + controlPrefix + "ExtensionNumber]").text(empExtensionNumber);
            $("[id$=_lbl" + controlPrefix + "ICQNumber]").text(ICQNumber);
            $("[id$=_lbl" + controlPrefix + "MobileNumber]").text(empPhone);
            $("[id$=_lbl" + controlPrefix + "ProfileTag]").text(profile);
            $("[id$=_lbl" + controlPrefix + "ResidencePhoneNumber]").text(empResidencePhoneNumber);

        }
        if (controlPrefix == "Old") {
            getUserEmpBasicData(uservalue, "EmpBasicInfo");
        }
    }
    else {

        $("[id$=_lblNewFirstName]").text("No Item Available");
        controlPrefix = "New";
        $("[id$=_lbl" + controlPrefix + "LastName]").text("");
        $("[id$=_lbl" + controlPrefix + "Department]").text("");
        $("[id$=_lbl" + controlPrefix + "Designation]").text("");
        $("[id$=_lbl" + controlPrefix + "DOB]").text("");
        $("[id$=_lbl" + controlPrefix + "ExtensionNumber]").text("");
        $("[id$=_lbl" + controlPrefix + "ICQNumber]").text("");
        $("[id$=_lbl" + controlPrefix + "MobileNumber]").text("");
        $("[id$=_lbl" + controlPrefix + "ProfileTag]").text("");
        $("[id$=_lbl" + controlPrefix + "ResidencePhoneNumber]").text("");
    }
    $("#PopupGVEmpBasicInfo").dialog({
        title: "Employee Basic Information Changed Details",
        resizable: false,
        height: 350,
        width: 550,
        modal: true,
        buttons: {
            Close: function () {
                $(this).dialog("close");
            }
        }

    });
}
// This function is executed if the above call fails
function retrieveListItemsFail(sender, args) {
    alert('Failed to get list items. Error:' + args.get_message());
}