I don't think the list: prefix is part of Tapestry itself, but of a
third-party module. Anyway, any context not dead simple is better served by
being done in Java instead of the template. That's the Tapestry philosophy.
On Wed, Oct 3, 2018 at 4:17 PM Ross, Cyndy <cyndy.r...@reged.com> wrote:
>
> try
> <t:eventlink t:event="changeRelation" t:async="true"
> t:context="list:account.get('test').userUuid, friend"> Change Relation
> </t:eventlink>
>
> square brackets doesn't work for me either. not sure why list: is not
> documented.
>
> cheers,
> Cyndy
> ________________________________________
> From: D. R. [d.re...@googlemail.com.INVALID]
> Sent: Tuesday, October 02, 2018 10:48 AM
> To: users@tapestry.apache.org
> Subject: eventlink with multiple context parameters
>
> Hi @all,
>
> I am confused about calling a java method with an eventlink and multiple
> context parameters:
> t:context="[account.get('test').userUuid, friend]" does not work, see
> below please.
>
> Following stuff is in my Java class:
>
> @Property(write = false)
> private final String friend = "friend";
> public AbstractMap<String, UserAccount> getAccount() {
> UserAccount userAcc = userAccounts.get(loopContactIndex);
> AbstractMap<String, UserAccount> test = new HashMap<String,
> UserAccount>();
> test.put("test", userAcc);
> return test;
> }
>
> void onChangeRelation(final String uuid, final String relation) {
> // no chance to come inside here...
> }
>
>
> void onForget(final String uuid) {
> // everything ok here...
> }
>
> It is no problem to call "onForget" with this eventlink:
> <t:eventlink t:event="forget" t:async="true"
> t:context="account.get('test').userUuid"> Forget </t:eventlink>
>
> But if I try to call an eventlink like:
> <t:eventlink t:event="changeRelation" t:async="true"
> t:context="[account.get('test').userUuid, friend]"> Change Relation
> </t:eventlink>
>
> then I get following exception:
>
> Exception assembling root component of page profile/User: Exception
> assembling embedded component 'usercontactlist' (of type
> com.myapp.t5.components.profile.UserContactList, within profile/User):
> Could not convert '[account.get('test').userUuid, friend]' into a
> component parameter binding: Exception generating conduit for expression
> '[account.get('test').userUuid, friend]': Class java.lang.Object does
> not contain a property (or public field) named 'userUuid'.
>
> Now I tried this eventlink:
> <t:eventlink t:event="changeRelation" t:async="true"
> t:context="[${account.get('test').userUuid}, friend]"> Change Relation
> </t:eventlink>
> And the page loads successful.
>
> But a click on this eventlink, calls the wrong method with only one
> parameter which is converted to java.lang.String:
>
> void onChangeRelation(final Object param) {
> System.out.println(param.getClass().getName() + ": " + param);
> }
>
> Console --> java.lang.String: [018260e7-844c-44a5-aefc-12faa80de42c,
> friend]
>
> means t:context="[${account.get('test').userUuid}, friend]" is
> interpreted as a String.
>
> if I remove the Map and return UserAccount directly in "getAccount()"
> the code works great:
> <t:eventlink t:event="changeRelation" t:async="true"
> t:context="[account.userUuid, friend]"> Change Relation </t:eventlink>
>
> Furthermore I tried to replace the AbstractMap with Optional class:
> <t:eventlink t:event="changeRelation" t:async="true"
> t:context="[account.get().userUuid, friend]"> Change Relation
> </t:eventlink>
>
> With this I get the same exception:
>
> Exception assembling root component of page profile/User: Exception
> assembling embedded component 'usercontactlist' (of type
> com.myapp.t5.components.profile.UserContactList, within profile/User):
> Could not convert '[account.get().userUuid, friend]' into a component
> parameter binding: Exception generating conduit for expression
> '[account.get().userUuid, friend]': Class java.lang.Object does not
> contain a property (or public field) named 'userUuid'.
>
> Why the second level is treated as Object, if i want to get a value in
> the third level?
> (i know, we could solve that by providing another getter in the java
> class, but this violates "code less, deliver more" :-)
> Why does this occur only in case of an eventlink with multiple parameters?
> What i am doing wrong?
>
> Thanks for help!
>
>
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--
Thiago
