Not sure if I'm understanding your sequence, but I don't see an AJAX
request there. Tapestry can return zone(s) in response to an AJAX request
(ie. XHR). Do these help?
http://jumpstart.doublenegative.com.au/jumpstart/examples/ajax/eventlink
http://jumpstart.doublenegative.com.au/jumpstart/examples/ajax/form
Geoff
On 25 March 2014 23:41, Davide Vecchi <d...@amc.dk> wrote:
> Sorry for the double post. After I posted the first one I realized I had
> unsubscribed from the mailing list some time ago, so I subscribed and sent
> the question again. I thought the one I had sent while unsubscribed
> wouldn't show up (it hadn't at that time). My apologies.
>
> -----Original Message-----
> Sent: Tuesday, March 25, 2014 12:27
> To: users@tapestry.apache.org
> Subject: Updating a zone from a property method
>
> I have a zone to show possible errors that might occur in a get* method
> called by Tapestry during page rendering to retrieve the value for a
> property (String myValue in the example below).
>
> So in this getMyValue() method I set the error message into another
> property (@Property String errorMessage) and I call addRender to update the
> template zone errorZone, where ${errorMessage} is placed.
>
> My problem is that this call to addRender has no effect: the errorMessage
> is not shown. But if I just reload the page it is shown.
>
> Below is a testable example. I'm trying to find out what's the right way
> to update a zone from a get* method called by Tapestry during page
> rendering.
>
> #####################################
> TestRender.tml:
> #####################################
>
>
> <html xmlns:t="http://tapestry.apache.org/schema/tapestry_5_1_0.xsd";>
>
> <t:zone id="errorZone" t:id="errorZone">
>
> <t:if t:test="isError">
>
> <div style="background-color:
> yellow;">${errorMessage}</div>
>
> </t:if>
>
> </t:zone>
>
> myValue: ${myValue}
>
> </html>
>
>
> #####################################
> TestRender.java:
> #####################################
>
> import java.util.Date;
>
> import org.apache.tapestry5.PersistenceConstants;
> import org.apache.tapestry5.annotations.InjectComponent;
> import org.apache.tapestry5.annotations.Persist;
> import org.apache.tapestry5.annotations.Property;
> import org.apache.tapestry5.corelib.components.Zone;
> import org.apache.tapestry5.ioc.annotations.Inject;
> import org.apache.tapestry5.services.ajax.AjaxResponseRenderer;
>
> public class TestRender
> {
>
> @Persist(PersistenceConstants.FLASH)
> @Property
> private boolean isError;
>
> @Persist(PersistenceConstants.FLASH)
> @Property
> private String errorMessage;
>
> @InjectComponent
> @Property
> private Zone errorZone;
>
> @Inject
> private AjaxResponseRenderer ajaxResponseRenderer;
>
> @Persist
> private String myValue;
>
> public void setupRender()
> {
> System.out.println(new Date() + " setupRender() was
> executed. It does nothing at all.");
> }
>
> public String getMyValue()
> {
> if (this.myValue == null)
> {
> System.out.println(new Date() + " myValue was null,
> so getMyValue() is setting it...");
>
> this.myValue = "My value at " + new Date();
>
> this.isError = true;
> this.errorMessage = "Let's say there was an error so
> I want to show this error message.";
>
> this.ajaxResponseRenderer.addRender(this.errorZone);
>
> /* I expected this addRender to cause the error
> message to be shown right away
> without the need to reload the page, but this is
> not the case. */
>
> System.out.println(new Date() + " getMyValue() has
> just called addRender.");
> }
> else
> {
> System.out.println(new Date() + " myValue was NOT
> null, so getMyValue() did nothing at all.");
> }
> return this.myValue;
> }
> }
>
>
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