Error message handling has changed between Daeja ViewONE Professional 3.1.X and 4.1.X
Though the following behaviors were changed after ViewONE 3.1, can we restore the new behavior to old one?
1) When the image file to be shown does not exist: On ViewONE 3.1, the error message box appears. On ViewONE 4.1 or later, the error message is displayed in the viewer.
2) When the javascript function to handle the event of the viewer does not exist: On ViewONE 3.1, the script error is displayed in IE. On ViewONE 4.1 or later, no error is displayed.
1) The behavior has improved in this area since the error now displays in the viewer, there is no ambiguity about where the error comes from. So there is no intention to revert this back to 3.1 behavior. You could use event 5 (document opened) or event 61 (document open failed) to display your own error dialog using the JavaScript alert() function. Note that event 61 is only available in 4.0.4 or later. You can refer to the following KnowledgeCenter.
Event handlers and event handling
https://www.ibm.com/support/knowledgecenter/SSTPHR_4.1.5/com.ibm.viewone.configuring/dvojs018.htm
Events IDs and descriptions
https://www.ibm.com/support/knowledgecenter/SSTPHR_4.1.5/com.ibm.viewone.configuring/dvojs020.htm
2) The missing/incorrect event handler function would be considered a programming error and therefore not something that should be exposed to end users so again, this is an improvement over previous behavior. So there is no intention to revert this back to 3.1 behavior. Further information for the programmer would be available by setting the HTML parameter <param name="traceJavascript" value="true"/> and then inspecting the Java console where a message should appear indicating that the viewer was unable to find the function.