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

Jelly scripting

Jelly scripting knowledge is important to build custom pages and scripts, and also to amend Jelly code that exists in ServiceNow as part of the platform to work in a different way for your own purposes. We introduced Jelly scripting and how it can be used in a UI page in the last chapter. Let's remind ourselves what the Jelly tags ServiceNow gives us look like:

<?xml version="1.0" encoding="utf-8" ?>
<j:jelly trim="false" xmlns:j="jelly:core" xmlns:g="glide" xmlns:j2="null" xmlns:g2="null">


Once these tags are in place, we can start to include our Jelly code inside. This can be added to a UI page or UI macro. We will take a look at UI macros later in the chapter.


First, let's have a look at the <g:evaluate> tag. This tag allows us to write JavaScript inside the tag and set a variable value at the end, if required. 

The <g:evaluate> tag is arguably the most used tag in Jelly, and is certainly one to get to grips with. Remember...