Using an HTML Tag to Create Action Events
You can use a combination of the HTML Tag on any input field and a browser script to create action events. For an input field, you can use HTML event functions such as onchange, onblur, onfocus, etc. to trigger actions which you can define in a browser script custom field.
For example, in an input custom field we put an onchange event in the HTML Tag box:
They can reference other fields that appear on the same form page, but they will have to know the field name/id (not the custom field name) in order to get it to work.