The rowpostupdate event may be called from web pages developed in Web Designer and processed by a USoft page engine service.
You can use this event to prevent the user from moving on to a different row, perhaps because a specific value must be supplied or changed in the currently selected row.
How to use
Find or create an Event Listener object with Event Type = rowquery. Event Listeners are in the Web Designer Controls catalog:
Insert the event listener into the data source object. Insert a callClientScript action into the event listener. Use this action's Script property to code the behaviour that you want to see when the event occurs.