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Version: 5.x

REQUEST operator

The REQUEST operator creates an action that requests a value.

Syntax​

REQUEST requestAction 
DO doAction [ELSE elseAction]

Description​

The REQUEST operator creates an action that allows the separation of a request for a value from its handling.

Parameters​

  • requestAction

    A context-dependent action operator that requests a value.

  • doAction

    A context-dependent action operator that is executed if the input was completed successfully.

  • elseAction

    A context-dependent action operator that is executed if the input was cancelled.

Examples​

requestCustomer (Order o)  {
    LOCAL resultValue = STRING[100] ();
    REQUEST {
        ASK 'Choose from list?' DO
            DIALOG customers OBJECTS c = resultValue() CHANGE;
        ELSE
            INPUT = resultValue() CHANGE;
    } DO
        customer(o) <- resultValue();
}

FORM request
    OBJECTS o = Order
    PROPERTIES(o) customer ON CHANGE requestCustomer(o) // for example, group adjustment will be performed
;