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Mastering ServiceNow Scripting

You're reading from   Mastering ServiceNow Scripting Leverage JavaScript APIs to perform client-side and server-side scripting on ServiceNow instances

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Product type Paperback
Published in Feb 2018
Publisher Packt
ISBN-13 9781788627092
Length 226 pages
Edition 1st Edition
Languages
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Author (1):
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Andrew Kindred Andrew Kindred
Author Profile Icon Andrew Kindred
Andrew Kindred
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Table of Contents (14) Chapters Close

Preface 1. Getting Started FREE CHAPTER 2. Exploring the ServiceNow Glide Class 3. Introduction to Client-Side Scripting 4. Advanced Client-Side Scripting 5. Introduction to Server-Side Scripting 6. Advanced Server-Side Scripting 7. Introduction to Custom Pages 8. Scripting with Jelly 9. Debugging the Script 10. Best Practices 11. Deployments with the Update Sets 12. Building a Custom Application Using ServiceNow Scripting 13. Other Books You May Enjoy

System performance best practices


There are a number of attributes that make up the perceived performance of an instance. These can be greatly effected by badly coded scripts or a large number of them that are not required.

One of the most common ways scripting can cause perceived performance delays is when an excess of client scripts are used when a form opens. This causes a big delay in browser rendering and parsing, which is very apparent to the user. As we have mentioned before, a best practice in this scenario is to limit the amount of client scripts created only to those essential, and to ensure that server calls are kept to a minimum.

If information is needed for an onLoad client script, then consider a display business rule instead of calling the server from a client script. 

Using this method, we can obtain the information we need from the server from the display business rule before displaying a form. Then, we run client-side code in a client script that will be able to use the information...

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