Question onChange client script on the reference field gets changed

[Amrita Dey]

In client script onChange logic if we have changed the Caller name, as Caller field is a reference field in the onChange function the oldValue or the newValue is giving the sys_id of the field not the exact name of the caller, now the name of the Caller we can get from the User table, so how we will fetch this username from the client script, so the username should be displayed as an alert message when the caller field gets changed?

[Ankur Bawiskar]

@Amrita Dey 

this is simple

use this to get the display value of caller_id user

function onChange(control, oldValue, newValue, isLoading, isTemplate) {
    if (isLoading) {
        return;
    }

    var displayName = g_form.getDisplayBox('caller_id').value;
    alert(displayName);
}

If you want to get the user_name then use this script

function onChange(control, oldValue, newValue, isLoading, isTemplate) {
    if (isLoading) {
        return;
    }

    var callerUserName = g_form.getReference('caller_id').user_name;
    alert(callerUserName);
}

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[Amrita Dey]

2nd one solution is working , but my query is "if I'm changing the value of caller field then in the following function 

function onChange(control, oldValue, newValue, isLoading, isTemplate) {

    if (isLoading || newValue === '') {

        return;

    }

    //Type appropriate comment here, and begin script below

    var username = g_form.getReference('caller_id').user_name;

    confirm(username);

}

oldValue is the sys_id of the old caller, newValue is the sys_id of the new caller, now from the getReference is taking the parameter of the field name like "caller_id", but the basis of the sys_id how I will get the caller full name.