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

Introduction to Jelly

Jelly is certainly a lesser known language to script in. It does not appear in the majority of ServiceNow, only on the outskirts of the platform. However, if you want to create custom pages in ServiceNow, it is a must to learn.

It is unfortunate that Jelly is a lesser known language, as documentation on how to use it is therefore also in short supply. Using pages already created in Jelly or the ServiceNow community can be very useful when getting started due to this general lack of information in the developer space.

One of the main areas you will find Jelly script is in UI pages, which we'll take a look at later in the chapter. Jelly code is found in XML field types, as it is a Java and XML scripting engine that allows XML to be turned into executable code.

When looking at Jelly script, you will see that it is almost always started and finished with the same tags. Let's have a look at this code:

<?xml version="1.0" encoding="utf-8" ?>
<j:jelly trim="false" xmlns...