Client Scripts in ServiceNow – Fundamentals Explained

1. Alert Full Name of Logged-in User

function onLoad() {
    var p = g_user.getFullName();
    alert('This is my first client Script = ' + p);
}

2. Alert If the Record Is New or Not

function onLoad() {
    if (g_form.isNewRecord()) {
        alert('This is new Record');
    } else {
        alert('This is not a new record');
    }
}

3. Use of Different APIs

function onLoad() {
    g_form.setReadOnly('u_email', true);
    g_form.setValue('u_description', 'hiiiiiii');
    g_form.clearOptions('u_category');
    g_form.getLabelOf('u_number');
    g_form.addInfoMessage('hi');
    g_form.setMandatory('u_first_name', true);
    g_form.setMandatory('u_last_name', true);
 
    if (g_user.hasRole('admin')) {
        g_form.removeOption('u_state', 'Maharashtra');
    }
}

4. Show Field After Record Creation (Hide in New Record)

function onLoad() {
    if (g_form.isNewRecord()) {
        g_form.setVisible("u_convert_to", false);
    } else {
        g_form.setVisible("u_convert_to", true);
    }
}

5. Populate Email & Short Description When Assigned To Changes

function onChange(control, oldValue, newValue, isLoading, isTemplate) {
    if (isLoading || newValue === '') {
        return;
    }
 
    var p = g_form.getReference("u_assigned_to").email;
    g_form.setValue("u_email", p);
    g_form.setMandatory("u_first_name", true);
    g_form.setValue("u_short_description", 'This is :' + g_user.getFullName());
}

6. Populate User’s First Name in Short Description

function onChange(control, oldValue, newValue, isLoading, isTemplate) {
    if (isLoading || newValue === '') {
        return;
    }
 
    var name = g_form.getReference("u_assigned_to");
    g_form.setValue("u_short_description", 'This is ' + name.first_name);
 
    alert(newValue);
    alert(oldValue);
}

7. Confirm Details Before Form Submit

function onSubmit() {
    var a = g_form.getValue("u_first_name");
    var b = g_form.getValue("u_last_name");
 
    var con = confirm(
        'You Entered below details -\n' +
        'The first name is: ' + a + '\n' +
        'The last name is: ' + b + '\n' +
        'Do you confirm the details?'
    );
 
    if (con == true) {
        return;
    } else {
        return false;
    }
}