Tech Tip: Utility to clear listbox

PRODUCT: 4D | VERSION: 15.x | PLATFORM: Mac & Win

Published On: July 6, 2017

Below is an utility method to help clear listboxes. This will delete all the columns in the listbox

// Method: UTIL_CLEAR_LB
// Parameters:
// $1 - Pointer to listbox

C_POINTER($lb;$1)
C_LONGINT($numCols;$i)
$lb:=$1

$numCols:=LISTBOX Get number of columns($lb->)
For ($i;$numCols;1;-1)
LISTBOX DELETE COLUMN($lb->;$i)
End for

CLEAR VARIABLE($lb->)

Example of usage:

UTIL_CLEAR_LB(->myListBox)