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Learning ServiceNow

You're reading from   Learning ServiceNow Get started with ServiceNow administration and development to manage and automate your IT Service Management processes

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Product type Paperback
Published in Mar 2017
Publisher Packt
ISBN-13 9781785883323
Length 358 pages
Edition 1st Edition
Languages
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Authors (2):
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Sylvain Hauser Sylvain Hauser
Author Profile Icon Sylvain Hauser
Sylvain Hauser
Tim Woodruff Tim Woodruff
Author Profile Icon Tim Woodruff
Tim Woodruff
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Toc

Table of Contents (14) Chapters Close

1. The Interface FREE CHAPTER 2. Lists and Forms 3. UI Customization 4. Understanding Data and Relationships 5. Tasks and Workflows 6. UI and Data Policies 7. User Administration and Security 8. Introduction to Scripting 9. The Server-side Glide API 10. The Client-side Glide API 11. Server-side Scripting 12. Client-side Scripting 13. Debugging 14. Pro Tips

Scripting in UI Policies


UI Policy conditions are evaluated both on-load (if the On Load tick-box is selected on the Advanced view) and whenever an update is made to any field on a form in ServiceNow. When an update is made, the condition on the UI Policy is re-evaluated. If the condition returns true, then the UI Policy Actions run. If the conditions return false (and Reverse if false is enabled) then the opposite of the UI Policy Actions run.

Understanding that these events all happen within the browser (AKA the client) tells us that UI Policies are evaluated client-side. In the Advanced view of the UI Policy form, there is a Script section. In this section, if the Run Scripts tick-box is selected, two script input fields will be displayed: Execute if true, and Execute if false. Each script has a pre-defined default value, which acts as the scaffolding for the script:

function onCondition() { 
 
} 

Any code you write inside of that function will be executed client-side, and thus will have...

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