Client Script - OnLoad with Realtime Scenarios and Use Cases


Organizations can automate business processes and manage IT service operations with ServiceNow, a robust platform. Using client-side scripting to extend and customize functionality is one of ServiceNow's primary features.

This post will discuss using ServiceNow's OnLoad client scripts to improve user experience and expedite workflows. In order to reinforce learning, we'll go over the fundamentals of OnLoad client scripts, offer real-world examples, and incorporate scenario-based questions.

Comprehending OnLoad Client Scripts

In ServiceNow, these scripts run whenever a form loads or is refreshed within the user interface. With the help of these scripts, developers can carry out a variety of tasks, including changing form fields, verifying data, and initiating business logic in response to particular circumstances. OnLoad scripts are frequently used to enhance user interaction and modify form behavior.

OnLoad Client Scripts

OnLoad Client Scripts: What Are They?

In ServiceNow, JavaScript functions known as OnLoad client scripts are launched whenever a form loads or is refreshed within the user interface.

Developers can modify form elements, check data, and start actions based on predefined criteria with these scripts. Organizations can customize ServiceNow forms to match their specific user preferences and business requirements by utilizing OnLoad scripts.

function onLoad() {
    // Your script logic here

The onLoad() function is automatically invoked when the form loads or refreshes. Within this function, developers can access form elements using the g_form API, interact with user data, and perform various actions.

Scenario 1. Setting Default Field Values

Requirement: When a new incident record is created, the Priority field should be set to "3 - Moderate" by default.

function onLoad() {
    var priorityField = g_form.getField('priority');
    if (g_form.isNewRecord())
        priorityField.setValue('3 - Moderate');

Scenario 2. Hiding Fields Based on User Role

Requirement: Hide the Assignment Group field for users with the "ITIL" role.

function onLoad() {
    var assignmentGroupField = g_form.getField('assignment_group');
    if (g_user.hasRole('itil'))

Scenario 3. Displaying Confirmation Message

Requirement: Display a confirmation message when a form is loaded.

function onLoad() {
    alert('Welcome to ServiceNow!');

Scenario-Based Questions

  1. How can you use OnLoad client scripts to set default field values in ServiceNow?
  2. Explain how you would hide a field based on the user's role using OnLoad client scripts.
  3. Provide a code snippet to display a confirmation message when a form is loaded in ServiceNow using OnLoad client scripts.


ServiceNow's OnLoad client scripts provide an effective way to modify forms and enhance user experience. Developers can improve the functionality of ServiceNow applications and expedite business processes by mastering the use of OnLoad scripts. Although there are countless applications for OnLoad scripts, the scenarios presented in this article show some real-world examples. Discover more features and try out various scenarios to fully realize the customization possibilities of ServiceNow.\

I hope this article is useful. Happy learning, and bye until next time.

Similar Articles