4D v13.4

Before subselection

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4D v13.4
Before subselection

Before subselection 


 

Before subselection ( subtable ) -> Function result 
Parameter Type   Description
subtable  Subtable in Subtable for which to test if subrecord pointer is before the first selected subrecord
Function result  Boolean in Yes (TRUE) or No (FALSE)

Subtables are no longer supported starting with version 11 of 4D. A compatibility mechanism ensures the functioning of this command in converted databases; however, it is strongly recommended to replace any subtables with standard related tables.

Before subselection returns True when the current subrecord pointer is before the first subrecord of subtable. Before subselection is used to check whether or not PREVIOUS SUBRECORD has moved the pointer before the first subrecord. If the current subselection is empty, Before subselection returns True.

Example  

The following example is an object method for a button. When the button is clicked, the pointer moves to the previous subrecord. If the pointer is before the first subrecord, it moves to the last subrecord:

 PREVIOUS SUBRECORD([People]Children) ` Move to the previous subrecord
 If(Before subselection([People]Children) ` If we have gone too far...
    LAST SUBRECORD([People]Children) ` move to the last subrecord
 End if

 
PROPERTIES 

Product: 4D
Theme: Subrecords
Number: 199

This command is deprecated and should not be used anymore

 
INDEX

Alphabetical list of commands

 
HISTORY 

Modified: 4D v11 SQL

 
SEE ALSO 

PREVIOUS SUBRECORD