How to do Simple non-Ajax Javascript Behaviour?

[Lester Chua]

Hi,

Hmmm, I have a simple thing which should be easy but I just cant figure 
out on Wicket.

1. I have an input box.
2. I need to "attach" a javascript to this box to monitor key presses. 
Basically I need to fire a js on the keyup event.

I've googled but have not found the answer to a basically simple thing.
I've tried the following which I realise wont work since the rendering 
should not be into the header (or should it?)

public class KeyPressTagBehavior extends AbstractBehavior
{
   private static final long serialVersionUID = 262920170424255562L;
   private Component component;

   public void bind(Component component)
   {
       this.component = component;
       component.setOutputMarkupId(true);
   }

   public void renderHead(IHeaderResponse iHeaderResponse)
   {
       super.renderHead(iHeaderResponse);
       iHeaderResponse.renderOnEventJavascript(
               component.getMarkupId(),
               "keyup",
               "alert('Key Up!')");       
   }
}


Then done a simple

TextField field = new TextField("somefield");
field.add(new KeyPressTagBehavior());

I realised that the renderHead will render into the head. But cant find 
a reference in the API to let me add it into the TextField. What is the 
correct way to do this?

Regards,

Lester

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