RE: why read ony ComponentEventException
Thanks Howard... i wondered if this one would get your attention and glad I can
move onward.
maybe i am getting old in my age but I got 5 years of hard C, 10 years of C++,
12 years of JAVA and a boat load of front end to back end...
conceptual expression parsing and de-referencing caught me up a bit I guess...
and I have thought recently (as I have in the past with tap3 and tap4)... why
does tapestry have to be so hard... but I think it's just me
maybe I am asking too much for these semantics should be flagged too... and
articulated for the developer
anyway... thanks... in the end tapestry is worth it and I could not think of
developing with anything else as extensible and flexible
- cheers
From: kcola...@live.com
To: users@tapestry.apache.org
Subject: why read ony ComponentEventException
Date: Sun, 18 Sep 2011 16:39:21 -0400
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
why read ony ComponentEventException
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
Re: why read ony ComponentEventException
${...} 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 ${...} was intended for attributes ordinary
(non-component) elements.
On Sun, Sep 18, 2011 at 1:39 PM, Ken in Nashua kcola...@live.com wrote:
Folks,
I have a page feeding read/write property
Home.JAVA
@Property(read = true, write = true) // no
getter/setter needed
@Persist(session)
private int itemsPerPage;
to a component parameter
Gallery.JAVA
@Property(read = true, write = true)
@Parameter(required = true, cache = true, defaultPrefix = 50)
private int itemsPerPage;
@BeginRender
public void beginRender()
{
//itemsPerPage = 50;
//tableColumns = 3;
}
org.apache.tapestry5.runtime.ComponentEventExceptionFailure
writing parameter 'value' of component
Home:gallerywidget.itemsperpageselect: Failure writing parameter
'itemsPerPage' of component Home:gallerywidget: Binding
org.apache.tapestry5.internal.services.AttributeExpansionBinding@3e963f38
is read-only.
here are some sources... to possbly indicate the issue but I cannot spot why.
Any ideas ? I would think that the annotations provided are sufficient? Also
if I try to set a value to this parameter within the component I receive the
same thing...
HOME.TML
...
t:form t:id=galleryForm t:name=galleryForm clientValidation=true
t:errors/
t:Gallery t:id=GalleryWidget
collection=${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
learn how I can get you up and productive in Tapestry fast!
(971) 678-5210
http://howardlewisship.com
-
To unsubscribe, e-mail: users-unsubscr...@tapestry.apache.org
For additional commands, e-mail: users-h...@tapestry.apache.org
