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
