${...} doesn't do what you think it does. It specifically extracts
the expression and converts it to a String, and the expression is
read-only.
Bind it like this:
itemsPerPage="itemsPerPage"
this binds the component parameter field directly to the containing
page's property, so it's read/write.
The use of ${...} was intended for attributes ordinary
(non-component) elements.
On Sun, Sep 18, 2011 at 1:39 PM, Ken in Nashua <[email protected]> wrote:
>
> Folks,
>
> I have a page feeding read/write property
>
> Home.JAVA
> @Property(read = true, write = true) // no
> getter/setter needed
> @Persist("session")
> private int itemsPerPage;
>
> to a component parameter
>
> Gallery.JAVA
> @Property(read = true, write = true)
> @Parameter(required = true, cache = true, defaultPrefix = "50")
> private int itemsPerPage;
>
> @BeginRender
>
> public void beginRender()
>
> {
>
> //itemsPerPage = 50;
>
> //tableColumns = 3;
>
> }
>
> org.apache.tapestry5.runtime.ComponentEventExceptionFailure
> writing parameter 'value' of component
> Home:gallerywidget.itemsperpageselect: Failure writing parameter
> 'itemsPerPage' of component Home:gallerywidget: Binding
> org.apache.tapestry5.internal.services.AttributeExpansionBinding@3e963f38
> is read-only.
>
> here are some sources... to possbly indicate the issue but I cannot spot why.
>
> Any ideas ? I would think that the annotations provided are sufficient? Also
> if I try to set a value to this parameter within the component I receive the
> same thing...
>
>
> HOME.TML
> ...
> <t:form t:id="galleryForm" t:name="galleryForm" clientValidation="true">
> <t:errors/>
>
> <t:Gallery t:id="GalleryWidget"
> collection="${collection}"
> itemsPerPage="${itemsPerPage}"
> tableColumns="${tableColumns}"
> cursor="${cursor}"
> />
> </t:form>
>
> </t:layout>
>
>
>
--
Howard M. Lewis Ship
Creator of Apache Tapestry
The source for Tapestry training, mentoring and support. Contact me to
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http://howardlewisship.com
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