Testing if a Form or Browse is Already Open
It is often necessary in an Xbasic program to test if a form or browse window is already open. To do this, use the IS_OBJECT() function. For example, the following command tests if a form called Customers is already open. If not, it opens the form. If it is open, it gives focus to the form.
if (is_object(":customers")) then 'form is open :customers.show()'show the form :customers.activate()'give focus to the form :customers.restore()'restore window size in case 'user minimized window else :form.view("customers") 'open the form end if
IS_OBJECT(customer.this) IS_OBJECT(:customer.this) IS_OBJECT(":customer") IS_OBJECT("customer")