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Which control have focus?

Posted on 1998-08-17
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Last Modified: 2010-04-16
How can I identify the control that have focus in an Applet? Im using Visual J++ 1.1 (JDK 1.0).
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Question by:pengch
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jdyer earned 100 total points
ID: 1221979
since you are using JDK 1.0 you should utilize the gotFocus message handler

Object focObj;

public boolean gotFocus( Event evt, Object arg )
{
focObj = evt.target;
}

this saves which object last received the focus, hence the one that currently has the focus.

Regards,
  jdyer
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by:pengch
ID: 1221980
I have several textfield in an applet. I need to identify which textfield having focus to emulate tab and limite the maximum caracter per field. But using method gotFocus of Applet, when a textfield adquire focus the method does not called (using Internet Explorer).
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Expert Comment

by:jdyer
ID: 1221981
How about lostFocus? Does that work in Internet Explorer.

Another hack of a sort would be to capture keyEvents, whichever TextField the last KeyEvent was in, save that and treat it as the one with Focus. There are obvious limitations of course. I don't know of anything else you could do though.

Generally this is difficult to do in JDK1.0.2, that's why the capability was added inherently in JDK1.1 and above.
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Author Comment

by:pengch
ID: 1221982
Ok, I will use keydown event´s evt.target to identify the control. Thanks!!
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