Ryan,
Here is some more of my code
public void pageBeginRender(PageEvent pageEvent){
if (!pageEvent.getRequestCycle().isRewinding()){
// if doing a render and the channel list is empty then
obtain a
new channel list and persist.
if
((getChannelSetup()==null)||(getChannelSetup().size()==0)){
try {
refreshCelloPagesSettings();
} catch (Exception e) {
e.printStackTrace();
}
}
System.out.println("rendering");
} else {
System.out.println("rewinding");
}
}
public void refreshCelloPagesSettings(){
Cello6 cello6=null;
try {
cello6 = getCello6DAO().get(getCelloSerialNumber());
} catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (Exception e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
if (cello6==null) return;
setChannelSetup(getCello6DAO().getChannelSetup(getCelloSerialNumber()));
setBatteryAlarm(getCello6().isBatteryAlarm());
byte rate = (byte)cello6.getLoggingRate();
setLoggingRate(rate);
}
I only initialise setChannelSetup when getChannelSetup is null, i.e.
when the page is first called and renders.
I will trace the page with breakpoints and see what happens.
On 14/10/06, Ryan Holmes <[EMAIL PROTECTED]> wrote:
Without seeing more of your code, my guess it that you are
unconditionally calling setChannelSetup() in your pageBeginRender
method. Something like this:
public void pageBeginRender(PageEvent event) {
setChannelSetup(new ArrayList<Cello6ChannelSetup>());
}
Remember that pageBeginRender is called *every time* the page is
rendered, not just the first time the page is displayed. So, if your
button calls a listener method that does something along the lines of
this:
public void addNewSetup() {
Cello6ChannelSetup setup = new Cello6ChannelSetup(...);
getChannelSetup().add(setup);
}
Then the pageBeginRender method runs *after* your listener method,
thus wiping out the change by re-initializing the list. I can
probably guess your next question, but I'll wait to see if I'm on the
right track first.
FYI, a good way to get a handle on Tapestry behavior for things like
this is to set a breakpoint in your listener method and in your
pageBeginRender method so you can see the order in which they are
called.
-Ryan
On Oct 14, 2006, at 11:52 AM, Jabbar wrote:
> Hello,
>
> I've been struggling all day editing persistent page properties and
> finding that the values of the properties is not what I expected after
> the render phases
>
> The persistant page property is
>
> @Persist
> public abstract List<Cello6ChannelSetup> getChannelSetup();
> public abstract void setChannelSetup(List<Cello6ChannelSetup> d);
>
> This gets sets in PageBeginRender when the page is first called. A
> button on the page is pressed which changes the property of one of the
> elements of the list. After the render the value of the channelSetup
> property is not what I expect.
>
> Does anybody have any ideas?
>
> Thanks
>
> --
> Thanks
>
> A Jabbar Azam
>
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Ryan Holmes, CISSP
[EMAIL PROTECTED]
ph. (213) 626-0026
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Thanks
A Jabbar Azam
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