ServiceNow: Building Powerful Workflows

Controlling fields

Most people intuitively understand the controls for a field, especially read and write. If a field is restricted for the create rule, it is read-only only when the record has not yet been saved. In the absence of a create field rule, the platform will use write rules for the field. This means that create field rules are often not used.

Even less relevant are delete field rules. They have no effect at all.

Just like GlideRecord has canWrite and canRead functions, so does GlideElement. So, you can call current.<field>.canWrite() in server-side scripts to see whether the rules let the user edit a field.

When creating field rules, especially if there are many fields on the table, consider whether you will be generally permissive ...