Hi Wicketeers,
I've just started into using Ajax in my Wicket apps and somehow
ended up using a specific pattern. My question is "Is this pattern the
Wicket Way" and if not, what is the "Wicket Way".
Situation:
The pages I am ajax enabling consist of many panels. Some panels
have navigational elements that need to trigger changes in other
panels at different levels of the heirachy.
The Pattern
My pattern is to pass down the webpage to subsequent panels as
required. At the mainpage level I have a swap routine for each panel
that needs change via ajax.
My code ends up looking like this :
public class PublicBasePage extends WebPage {
public PublicBasePage(){
PublicLeftNavPanel publicLeftNavPanel = new
PublicLeftNavPanel("publicleftnavpanel",this);
add(publicLeftNavPanel);
...
...
}
void swapMainContent(Panel thePanel,AjaxRequestTarget target){
thePanel.setOutputMarkupId(true);
centerBox.replaceWith(thePanel);
if (target != null) {
target.addComponent(thePanel);
}
centerBox = thePanel;
}
... More of these swaps for each element in the page that is
ajaxified. Could be abstracted a bit more
... I also have a version that works for the non-ajax
case so it falls back cleanly
}
--
public class PublicLeftNavPanel extends Panel {
public PublicLeftNavPanel(String id, final PublicBasePage
mainPage){
super(id);
AjaxFallbackLink residentialLink = new
AjaxFallbackLink("residential") {
@Override
public void onClick(AjaxRequestTarget target) {
mainPage.swapMainContent(new
PublicResidentialMainPanel("centerbox"),target);
}
};
residentialLink.setAutoEnable(true);
add(residentialLink);
... More of these ajaxlinks for each link element in
the navigation bar
}
}
So, what is happening is the navigation panel calls back into the
webpage to do the swap required in lower level panels that live in
different branches of the tree.
It works but doesn't feel right and in all my googling I could not
find a clear answer on specifically what to do when you have
disconnected panels and one panel needs to trigger an update in the
other one. I imagine its obvious so my apologies.
I did find a link to "Loose coupling"
(http://techblog.molindo.at/2008/09/wicket-loose-coupling-of-componens-for-ajax-updates.html)
but that seemed a bit of a ways to go to accomplish the task (although
very elegant).
Thanks for setting me straight before I go too far with this,
John-
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