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
Contributors
Preface
Index

Using ServiceNow exposed JavaScript APIs


ServiceNow provides developers with some exposed JavaScript APIs to aid them with the scripts they write. This saves a lot of time in accessing records and fields in scripts in ServiceNow. There are a number of different classes and objects available to developers, some of which very helpful and others rarely used.

GlideRecord

One of the most common JavaScript APIs is the GlideRecord class, which is extremely handy and will fast become a staple of most scripting. GlideRecord is a way of finding and counting records in ServiceNow based on many different queries. It is quite similar to a SQL statement if that is something you are familiar with.

Let's have a look at how to use GlideRecord.

We'll take a look at how to query all the records in a particular table. The format of the GlideRecord script for this is shown in the following, with table_name being the only parameter. This needs to be the table name rather than the table label:

new GlideRecord('&lt...