GET Command VALID Clause UDF Executed For Each Entry

• Microsoft FoxBASE+ for MS-DOS, version 2.1
• Microsoft FoxPro for MS-DOS, versions 1.02, 2.0, 2.5, and 2.5a
• Microsoft FoxPro for Windows, versions 2.5 and 2.5a

SUMMARY

When a GET statement VALID clause contains a user-defined function (UDF), the UDF is executed each time the user leaves the field.

MORE INFORMATION

The following code illustrates that a VALID clause UDF is executed each time the user leaves the field. After creating the two files below, enter DO TEST.PRG at the dot prompt. The code demonstrates that whenever the user presses TAB or ENTER to move to the next GET field, the UDF executes, even when the user does not change the value of the "num2" field from zero.

   * TEST.PRG
   CLEAR
   SET TALK OFF
   STORE 0 TO num1,num2,num3
   @3,10 SAY "NUMBER 1: " GET num1
   @5,10 SAY "NUMBER 2: " GET num2 VALID myudf()
   @7,10 SAY "NUMBER 3: " GET num3
   READ SAVE

   * MYUDF.PRG
   PUBLIC mreturn
   mreturn=.F.
   @15,15 SAY "IN MYUDF()                            "
   IF num2<>0
     @15,26 SAY "AND VALUE CHANGED FROM ZERO"
     mreturn=.T.
   ENDIF
   RETURN mreturn