Siebel Object Interfaces Reference > Browser Scripting >
Table 76 lists a summary of the business component events.
Called when a value is changed by the user in the user interface.
This Browser Script event is invoked after the server round trip if the Immediate Post Changes property of the Business Component field is set to TRUE.
NOTE: This event is not invoked on picklists and multivalue fields.
BusComp_PreSetFieldValue (fieldName, value)