Event triggering in Capture 12c

Hi All,

I want to display a popup whenever i press  F5 from my keyboard  in capture client. I've the below script which is deployed in capture, seems it's not getting triggered. How i can check the logs whether which part of this script is causing problem? I'v enabled console log, but it's not appearing neither in server log nor in console log. Can anyone let me know where i'm doing it wrong?

load('nashorn:mozilla_compat.js');

importClass(java.awt.event.KeyEvent);

importClass(javax.swing.JOptionPane);

importClass(java.lang.System);

importClass(javax.script.ScriptException);

importClass(java.lang.Class);

print("Before FieldProcessKey");