0) I don't usually extend components; I prefer building things based
on composition. That said:
2) This will work iff your parent class also implements a
"defaultName" method that the subclass overrides. Just tried it to be
sure.
3) You can provide getters and setters for the property. Promise. :)
But the question at stake is /when/ you can access the bound value for
supplying a default, and in that, you may be correct.
Robert
On Feb 12, 2009, at 2/122:18 PM , Yunhua Sang wrote:
Hi Robert,
2) I tried your way, it doesn't work; it doesn't work even back to
5.0.18.
3) I don't think the get/set methods would work for parameters; look
at ParameterWorker class, it's fairly complicated because of the
implementation of the binding magic.
Thanks,
Richard
On Thu, Feb 12, 2009 at 2:56 PM, Robert Zeigler <robe...@scazdl.org>
wrote:
1) Since Child extends Parent, it already has a name @Parameter.
2) If you want to provide the default in the child, you can always
provide
the "default" method:
String defaultName() {
return "Tom";
}
3) Otherwise, access in the child via code is mediated through
normal java
channels: create a public (or protected) getter and setter in the
Parent
class.
Robert
On Feb 12, 2009, at 2/1212:45 PM , Yunhua Sang wrote:
Hi Howard,
Can you show me in a child component, how to access a parameter
defined in parent by using another way? I cannot find api which
isn't
internal about it. By the way, seems it's also diffcult to provide
default binding for a parameter within parent because function
bindParameter(String parameterName, Binding binding) is internal as
well.
Thanks,
Yunhua
On Thu, Feb 12, 2009 at 11:10 AM, Howard Lewis Ship <hls...@gmail.com
>
wrote:
It looks to me like theres an ambiguity here: I don't think a child
component should be allowed to declare a second parameter, "name"
in
this example, that is already defined in a super-class.
On Wed, Feb 11, 2009 at 12:20 PM, Yunhua Sang <yunhua.s...@gmail.com
>
wrote:
Hello Howard,
It turns out the error occurs only when the child wants to
provide its
own default binding for a parameter originally defined in parent;
example:
public class Parent {
@Parameter
private String name;
void setupRender() {
name.toUpperCase(); // NPE happens here
}
}
public class Child extends Parent{
@Parameter("prop:name")
private String name;
public String getName() {
return "Tom";
}
}
Page class:
public class ChildExample {
@Component
private Child child;
}
Template ChildExample.tml:
<html xmlns:t="http://tapestry.apache.org/schema/tapestry_5_0_0.xsd
">
<h3>Test</h3>
<t:child t:id="child"/>
</html>
I am sorry for my previous inaccurate information and thanks for
looking into it.
Yunhua
On Wed, Feb 11, 2009 at 2:15 PM, Howard Lewis Ship <hls...@gmail.com
>
wrote:
I'm not aware of anything that's changed in this area; could you
elaborate?
On Wed, Feb 11, 2009 at 10:56 AM, Yunhua Sang <yunhua.s...@gmail.com
>
wrote:
Hello all,
It seems there is no clear document about how to access a
parameter
defined in parent component; previous to 5.0.18, I was using
the way
of declaring the parameter again in child class and it worked
well;
however looks like some changes in 5.1.0.0 broke the way,
seems there
is no link between the parameter with same name in parent and
child
now.
The problem is when I am USING a tapestry component, it's such a
comfortable experience; but when I write a sub-class of a
component, I
am getting frustrated: a lot of methods are package visible;
there is
no clear way for parameter manipulation, a typical question:
can I
update an attibute of parameter in parent class? If
inheritance is not
a good practice in Tapestry, there should be a document about
it.
Thanks in advance for any help,
Yunhua
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