Basic HTML version of Foils prepared October 3 1999

Foil 24 User and System Events

From Tango Futures CEWES(ERDC) Tango Traing -- Sept 16-17 1999. by Geoffrey C. Fox


One can either share raw system message (click event occurred) or higher level user event generated by JavaScript invoked by event
Note Netscape 4.5 does NOT allow you to generate a general event in a page
  • You can invoke "click" events on form elements but not so events associated with layers
  • You can parse JavaScript invoked by event and transmit but this is unreliable
So User events are convenient and sometimes required
Function process() ...
Invoke Tango JS Interface
with user defined meaning
Click on Button which happens to
invoke some User JavaScript Code
Capture Click and
Invoke Tango JS Interface
with meaning that click occurred
Or



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