A UI Policy conditionally performs a limited set of actions on a form, such as making a field mandatory or hiding it from view. Internally, this uses a client-side class called
GlideForm, which is also available for use by the System Administrator.
Just like Business Rules, ServiceNow also provides some global variables that smooth the interaction with the platform. On every form, you'll find a
g_form object instantiated from
For more information, check out the wiki at http://wiki.servicenow.com/?title=GlideForm.