Flexibility added to Syntax of Smart Devices User Events

Unofficial Content

Sometimes in our applications we need to evalute special conditions or use auxiliar methods, on User Events. To acomplish that on GeneXus X Evolution 2 we needed to call a procedure to evaluate the condition (or exectue the method) and return the result back. As from GeneXus X Evolution 3, we are able to evaluate complex conditions, and use auxiliar methods on User Events. 
The following things could be inside an expression:

  • Variables
  • Attributes
  • Constants
  • Methods
  • Functions
  • Control properties
  • Operators (+, -, *, /, ^)

Examples

Event 'clientEvent'
     &Number1 = 45
     &Number2 = 34
     If &Number1 > &Number2
       msg('Condition evaluated successfully')
     Endif
EndEvent

Event 'clientEvent'
     &String = &Number.ToString()
EndEvent

Benefits

The following are some of the benefits of this feature: 

  • Avoid calling a procedure for every complex condition evaluated on user events.
  • Avoid calling a procedure for every auxiliar method used on user events.
  • More clarity on your GeneXus code.