Is there anything that needs to be down to initiate the data binding? Below is my code and it does not appear to be working (none of the console.log messages are being shown)

groupDropDown.dataSource = function (query, callback) {
console.log(‘here’);
//The Ajax request goes here
let xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function () {
console.log(‘here2’);
if (this.readyState == 4 && this.status == 200) {
console.log(result);
callback(result);
}
};
xhttp.open(“GET”, “/Ajax/Ajax_group.aspx/GetDeviceGroupsForSmartDropDown”, true);
xhttp.send();
}