If Textfield is empty then deactive a button

Hello,
I have a Textfield and a Button with a Trigger. The Trigger like this code:
DECLARE
eingabe2 VARCHAR2(20);
BEGIN
eingabe2 := :eingabe;
IF eingabe2 = '' THEN :eingabe := 3;
END IF;
END;
I need a Trigger that the Button deactive, when the Textfield is empty.
Can someone Help me?
The Variable "eingabe" is the name of my Textfield.
Greetings

@Dipin ojha
Thank you, it works!
But i have found an other problem. ;-)
How can i change it, that the button ist so long deaktiv
till i write something in the Textfield ?
Because i have an "OK" button and i want, that the button is
active if something is writing in the textfield.
Hi,
wie man ein trigger direkt macht, wei_ ich.
Ich mvchte es gerade jetzt so haben, dass der Button erst
aktiv wird, wenn der User etwas in das Textfeld eingetragen hat,
weil ist ja blvd wenn man OK klicken kann, aber dann nix im textfeld steht.
Ps: Hast Du ICQ?

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If Textfield is empty then deactive a button

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