Book Image

Mastering ServiceNow Scripting

By : Andrew Kindred
Book Image

Mastering ServiceNow Scripting

By: Andrew Kindred

Overview of this book

Industry giants like RedHat and NetApp have adopted ServiceNow for their operational needs, and it is evolving as the number one platform choice for IT Service management. ServiceNow provides their clients with an add-on when it comes to baseline instances, where scripting can be used to customize and improve the performance of instances. It also provides inbuilt JavaScript API for scripting and improving your JavaScript instance. This book will initially cover the basics of ServiceNow scripting and the appropriate time to script in a ServiceNow environment. Then, we dig deeper into client-side and server-side scripting using JavaScipt API. We will also cover advance concepts like on-demand functions, script actions, and best practices. Mastering ServiceNow Scripting acts as an end-to-end guide for writing, testing, and debugging scripts of ServiceNow. We cover update sets for moving customizations between ServiceNow instances, jelly scripts for making custom pages, and best practices for all types of script in ServiceNow. By the end of this book, you will have hands-on experience in scripting ServiceNow using inbuilt JavaScript API.
Table of Contents (18 chapters)
Title Page
Packt Upsell

Client-side Glide classes

The client-side Glide classes are for use in scripts that are run directly in front of the user. These include manipulating and working with form fields and user data and being able to call server-side scripts to return values in the database.


I would say that GlideForm or g_form is the most used client-side class. It is mainly used for getting data from the fields on the form and setting values to those fields as well. We can also change elements of those fields using g_form.

We'll start by looking at how to get and set values from and into fields:

var stateValue = g_form.getValue('state');

The string value inside the speech marks is the database name for the field. Make sure you use the name rather than the label when getting a value using g_form. The getValue method essentially puts the value of a field into a variable for you. This then allows you to use that variable to check against other data or pass as a parameter into a function: