Yeah that's what I thought. And I tried it, but visually nothing happened. I'll give it another shot.

Sent from my iPhone
http://friendfeed.com/astubbs

On 31/05/2009, at 7:15 AM, Igor Vaynberg <igor.vaynb...@gmail.com> wrote:

you can just replace the entire panel with a new instance.

-igor

On Sat, May 30, 2009 at 3:11 AM, Antony Stubbs <antony.stu...@gmail.com > wrote:
We use AjaxLazyLoadingPanel, and want to be able to trigger the process of showing the indicator, and requesting the panels contents with a separate Ajax request, after the first complete render has finished. I.e. do the whole process over and over, without having to reload the entire page.

I came up with this, which I was surprised actually worked first try :)
gotta love Wicket.

But perhaps there's a better way to do it ? A simpler way? Something I'm missing? I tried simply replacing the lazy loading panel with a new instance of one but that didn't seem to have an effect - I think the magic is in the
adding a new AbstractAjaxBehaviour on each request.


import org.apache.wicket.Component;
import org.apache.wicket.ajax.AbstractDefaultAjaxBehavior;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.extensions.ajax.markup.html.AjaxLazyLoadPanel;
import org.apache.wicket.markup.html.IHeaderResponse;

/**
 * An {...@link AjaxLazyLoadPanel} extension which allows it to
* {...@link #restart(AjaxRequestTarget)} the process of showing the loading
 * indicator, then load it's contents using a separate Ajax request.
 *
 * @author Antony Stubbs
 */
abstract public class ReloadingAjaxLazyPanel extends AjaxLazyLoadPanel {

   private static final long serialVersionUID = 1L;

   public ReloadingAjaxLazyPanel(String id) {
       super( id );
   }

   /**
    * Causes the {...@link AjaxLazyLoadPanel} to re-display the loading
indicator,
    * then in a seperate ajax request, get it's contents.
    *
    * @param target
    */
   public void restart(AjaxRequestTarget target) {
       target.addComponent( this );

       // replace panel contents with loading icon
       Component loadingComponent = getLoadingComponent( "content" );

       this.replace( loadingComponent );

       // add ajax behaviour to install call back
       loadingComponent.add( new AbstractDefaultAjaxBehavior() {

           private static final long serialVersionUID = 1L;

           @Override
           protected void respond(AjaxRequestTarget target) {
               Component component =
ReloadingAjaxLazyPanel.this.getLazyLoadComponent( "content" );
               ReloadingAjaxLazyPanel.this.replace(
component.setRenderBodyOnly( true ) );
               target.addComponent( ReloadingAjaxLazyPanel.this );
               // setState((byte)2);
           }

           @Override
           public void renderHead(IHeaderResponse response) {
               super.renderHead( response );
               response.renderOnDomReadyJavascript(
getCallbackScript().toString() );
           }

       } );
   }

}

As you can see, there is duplication from AjaxLazyLoadingPanel - which would
need re-factoring in order to remove. - no problem there.
But also, because the setState method is private, I can't use that state
system.

Regards,
Antony Stubbs,
NZ
http://friendfeed.com/astubbs



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