Easiest way to call a wicket method from javascript is imho to extends
AbstractDefaultAjaxBehavior - implement the respond() method, call
getCallbackScript() to obtain javascript that needs to be executed to
call the respond() method. The behavior must be added to a component
(or page, as page itself is also a component).
-Matej
On 3/16/07, Eelco Hillenius <[EMAIL PROTECTED]> wrote:
> Here is a super-simple example of creating a custom request listener.
>
> First, you create the new listener interface:
>
> public interface IHelloListener extends IRequestListener
> {
> public static final RequestListenerInterface INTERFACE = new
> RequestListenerInterface(
> IHelloListener.class);
>
> void onHello();
> }
>
> Note that it has a single method without parameters. This is a
> requirement as you can read from IRequestListener's JavaDocs. The
> other thing to note is the INTERFACE field; by instantiating a
> RequestListenerInterface you register the interface, and the field
> exposes a handle for constructing URLs using RequestCycle's UrlFor
> methods.
>
> Next, I simple patched the HelloWorld example like this:
>
> public class HelloWorld extends WicketExamplePage implements IHelloListener
> {
> public HelloWorld()
> {
> add(new Label("message", "Hello World!"));
> WebMarkupContainer link = new WebMarkupContainer("link");
> link.add(new SimpleAttributeModifier("href",
> RequestCycle.get().urlFor(this,
> IHelloListener.INTERFACE)));
> add(link);
> }
>
> public void onHello()
> {
> RequestCycle.get().setRequestTarget(new IRequestTarget()
> {
> public void detach(RequestCycle requestCycle)
> {
> }
>
> public void respond(RequestCycle requestCycle)
> {
>
> requestCycle.getResponse().write("<html><body>HELLO!</body></html>");
> }
> });
> }
> }
>
> The html is straightforward, with the link defined like: <a
> wicket:id="link">click me</a>
>
> And that's all there is to it: we created a new kind of listener for requests.
>
> Note that it is (still) bound to a page (or any arbitrary component).
> It is entirely possible to decouple this further, from the top of my
> head by providing a custom WebRequestCodingStrategy and override
> doEncode for your specific purpose. But if you are doing that, you
> probably might as well just create your own servlet.
>
> It is certainly a design goal for Wicket to be very extensible.
> However, it is *also* a goal to have different levels in our
> abstraction. I agree with Igor that having services so upfront in the
> architecture is or at least encourages scope creep, as it makes it too
> obvious for users to start coding their own as if they were a
> replacement for servlets and don't take the time to fully get into the
> component mind set. As you can see from the example, there are pretty
> much no limits to what you can do with Wicket, but we hope that doing
> things like creating custom listeners are only used as a last resort.
> And if you think you find a really good use, we'd appreciate it if you
> would communicate it as there might be something we missed and can
> result in a useful addition to Wicket.
>
> My 2c, and again, if you have good and specific use cases, share them :)
>
> Eelco
>
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