Hi Marcel,
The binding of the listener to the event is done automatically by
tapestry based either on the @OnEvent annotation or by naming
convention.
The context argument is simply used to allow for additional
information to be encoded into the url which will be provided to the
handler in the form of method parameters.
For example:
.html:
<a href="${myLink}">My Link</a>
.java:
@Inject
private ComponentResources resources;
public Link getMyLink() {
return resources.createEventLink("myevent","value1");
}
@Inject
private ComponentSource componentSource;
Object onMyevent(String name) {
//do something interesting. Here, we look up a page based on the
page name provided in name.
return componentSource.getPage(name);
}
And that's it. Now when you click "MyLink", the "onMyevent" method
will be called, passing in "value1" as the value of the "name"
parameter.
* The values in context will be converted to and from strings via the
ValueEncoder service & contributions.
* Events always bubble in T5, so your handler has to be either at the
level of the component which has the link, or in a class that wraps
that component. That is, suppose the following page structure:
page x
- component a
- event link, event is "foo".
- event link, event is "bar".
The handler for the "foo" event must be in either component a or in
page x. The handler for "bar" must be in page x. A handler for the
"bar" event in component a won't be called by clicking the event link
of page x.
HTH,
Robert
On Nov 3, 2008, at 11/312:05 PM , Marcel Sammut wrote:
I'm aware of the large gap between 3 and 5 and may require some
redesign on
my part. That is why I'm using native tapestry links. In 5.0.15, the
ComponentResources class has the createActionLink deprecated in
favor of
createEventLink. There are only 2 difference between ActionLink and
EventLink according to the API, the way it is controlled and the way
it is
triggered.
I do want to use an EventLink in my situation, and do this through
ComponentResources.createEventLink(). The tutorials show you how to
use the
ActionLink in a template, whereas in my case, the component is
created via
Java code. Perhaps I do not understand what the "context" argument
in the
createEventLink() method is used for. I believe that the first
argument
would be the name of the method to invoke? How do you identify the
handler
of the event when creating the EventLink? Tutorials show this
binding done
through the @OnEvent annotation and specifying the event name via the
"component" attribute in the annotation or the "id" attribute of the
element.
How would I bind these properties using a pure Java implementation?
My
previous T3 components never had a template file, and rendered purly
in
Java.
Thanks
- Marcel
Peter Stavrinides wrote:
Hi Marcel
Tapestry 5 is not like 3, most of the boilerplate code is gone, it
appears
to me that you are trying to do too much... have you gone through the
tutorials yet? I think you will be pleasantly surprised how simple
yet
powerful T5 is. You also haven't quite grasped the difference between
ActionLink and EventLink and PageLink (it sounds like you want an
EventLink)
cheers
Peter
Thanks!
I seem to be able to render the anchor component based on the Link
being
created from the ComponentResources.createActionLink(). However, the
action
does not seem to be fired when I hook up the event using the @OnEvent
annotation. The anchor is rendered using the MarkupWriter.element()
method
using the Link object to define the href attribute.
Note, that the creating and rendering of the action anchor is done
purely
in
Java...no template.
My anchor renders the following url:
mypage.pagelayout/activate Activate
There is a page called Home/MyPage and on this page is a component
called
PageLayout which is an extension of my Layout component. In the
PageLayout
component, I have my "activate" event handler as follows:
@OnEvent(component="activate")
public Object activate() {
...
}
Any idea why the activate event is not being called and how I can
hook the
event to the action?
Thanks Once Again.
Marcel
Howard Lewis Ship wrote:
${createURL} click me
You just have to provide getCreateURL() as a wrapper around
ComponentResources.createActionLink().
You don't instantiate a component, just @Inject the
ComponentResources.
On Fri, Oct 31, 2008 at 5:24 PM, Marcel Sammut <[EMAIL PROTECTED]>
wrote:
Thanks for the quick response. My delima is that I need to have a
reference
to the link in the .tml template. I was hoping to just use a
pure Java
implementation to let the developer configure the menu via code.
In order to do this, I believe I have to inject the
ComponentResources
object of my container when instantiating the AbstractLink
component.
Any
idea to do that?
Thanks,
Marcel
Robert Zeigler wrote:
Why not just use ComponentResources.createActionLink and
ComponentResources.createPageLink?
.tml:
$somelink Link Text
.java:
@Inject
private ComponentResources resources;
public String getSomeLink() {
return
resources
.createPageLink("mypage",true,contextValue1,contextValue2,...);
}
Robert
On Oct 31, 2008, at 10/315:04 PM , Marcel Sammut wrote:
Greetings,
I'm looking at porting my 3.0 tapestry web application to v5
and I'm
trying
to build a menu component which accepts a parameter of type
ArrayList that
contains a list of AbstractLink objects. These items get
rendered
in a menu
layout etc. The page that this menu component exists on will
create, at
runtime, the set of desired menu item and pass them to the menu
component.
This sounds straight forward, however, I am unable to determin
how to
instantiate, for example, a new instance of a ActionLink. In the
previous
version (3.0), I simply rendered the anchor myself and
generated the
URi in
a custom implementation. I was hoping that in T5, I would be
able
to use
the internal Link components since they do pretty much what I was
doing in
3.0.
Is there a way, in code, to create a new ActionLink component and
have it
act as the model for another component to be rendered?
Your thoughts are much appreciated.
- Marcel
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