Hello all, I am new to Tapestry, and have been working through several of the tutorial examples. Something in particular that I am trying to do (and struggling to do so) is the chaining together of multiple select components. The approach to do so appears fairly straightforward, as documented towards the bottom of the page here:
http://tapestry.apache.org/tapestry5.2-dev/tapestry-core/ref/org/apache/tapestry5/corelib/components/Select.html http://tapestry.apache.org/tapestry5.2-dev/tapestry-core/ref/org/apache/tapestry5/corelib/components/Select.html So, what I want to do is: 1. Load up a page that has a single populated select component visible 2. When a value is selected, a second select component should become visible, populated with values specific to what was chosen in the first select component The linked example above describes exactly this, and so I copied this code into my project. This included the following files: *1. CarMaker.java* public enum CarMaker { MERCEDES, AUDI, BMW; } *2. SelectZoneDemo.tml* <html xmlns:t="http://tapestry.apache.org/schema/tapestry_5_1_0.xsd";> <t:form> <p> <t:errors /> </p> <p> <t:select t:id="carMaker" validate="required" zone="modelZone" /> </p> <t:zone t:id="modelZone" id="modelZone"> <t:if test="carMaker"> <p> <t:select t:id="carModel" model="availableModels" validate="required"/> </p> </t:if> </t:zone> <p> <t:submit value="literal:Submit" /> </p> </t:form> </html> *3. SelectZoneDemo.java* public class SelectZoneDemo { @Inject private Messages messages; @Property @Persist private CarMaker carMaker; @Property @Persist private String carModel; @InjectComponent private Zone modelZone; @Property @Persist private List<String> availableModels; public Object onValueChanged(CarMaker maker) { availableModels = findAvailableModels(maker); return modelZone.getBody(); } public List<String> findAvailableModels(final CarMaker maker) { switch (maker) { case AUDI: return Arrays.asList("A4", "A6", "A8"); case BMW: return Arrays.asList("3 Series", "5 Series", "7 Series"); case MERCEDES: return Arrays.asList("C-Class", "E-Class", "S-Class"); default: return Arrays.asList(); } } } Now, this all compiles fine, and using Jetty I can quickly start up the server and access the SelectZoneDemo page. When the page loads, the "CarMaker" select is visible and populated. When I select a value from this component, I have verified that the onValueChanged method in SelectZoneDemo.java is called (this was verified by adding the @Log annotation). However, the method never exits and never returns the modelZone.getBody() to the page. What I see in the console is the following: [DEBUG] pages.SelectZoneDemo [ENTER] onValueChanged(BMW) [DEBUG] pages.SelectZoneDemo [ENTER] findAvailableModels(BMW) [DEBUG] pages.SelectZoneDemo [ EXIT] findAvailableModels [["3 Series", "5 Series", "7 Series"]] As you can see, there's no EXIT log for onValueChanged. What I've been able to determine through some trial and error, is that the point at which the method "hangs" is on this line of onValueChanged: availableModels = findAvailableModels(maker); Furthermore, through additional testing I was able to determine that the act of setting any value at all to availableModels will result in the onValueChanged method not exiting. For example, I tried simply doing this: availableModels = new ArrayList<String>(); ...and got the same result. Now, if I comment out the line that sets a value to availableModels, the onValueChanged method will exit, but the modelZone on SelectZoneDemo.tml remains hidden. At this point, I'm completed stumped. I've googled everything that I can think of, and at this point I'm sure that my problem must be a fundamental misunderstanding of how Tapestry works. If anyone could offer some assistance, I would be very grateful. -- View this message in context: http://tapestry.1045711.n5.nabble.com/Chaining-of-Select-components-tp4705879p4705879.html Sent from the Tapestry - Dev mailing list archive at Nabble.com. --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@tapestry.apache.org For additional commands, e-mail: dev-h...@tapestry.apache.org
