When your request is an ajax call, you can use the following construct
to use the JavaScriptSupport service:
ajaxResponseRenderer.addCallback(new JavaScriptCallback() {
@Override
public void run(JavaScriptSupport javascriptSupport) {
// Your code here
}
}
Op 27/09/2018 om 10:59 schreef Davide Vecchi:
Hello everybody,
I am having exactly the same problem described in the thread linked below, that
is the exception
"No object of type org.apache.tapestry5.services.javascript.JavaScriptSupport is
available from the Environment"
that occurs only if the event handler is handling an Ajax request:
http://apache-tapestry-mailing-list-archives.1045711.n5.nabble.com/No-object-of-type-org-apache-tapestry5-services-javascript-JavaScriptSupport-is-available-from-the-E-tp5551633p5551729.html
My stacktrace is at the bottom of this email.
The event being handled in my case is the click on an EventLink that has its
t:zone attribute set to the name of a zone.
In that thread jochenfrey explains that he solved the problem using the Trigger component
to "get Tapestry Initializer Calls into the Response", which I think is what I
need as well.
However, I don't know where in the template the <trigger> tag must be placed.
I'm also not sure what the event handler of the trigger should do in order to provide
JavaScript to the EventLink handler. So those are my two questions.
My understanding is that the Trigger event handler should push the
JavaScriptSupport instance on the stack, so I do:
environment.push(JavaScriptSupport.class, javaScriptSupport);
but I'm not sure that's what is needed, and anyway it doesn't work for me, it
get that exception.
I have put the <trigger> tag immediately after the opening tag of the zone the
EventLink is bound to:
========================================================================
<t:zone id="myBoundZone" >
<t:trigger event="javaScriptNeeded" />
......
</t:zone>
<form t:type="form" t:id="mainForm">
<t:zone t:id="mainZone1">
......
<t:zone t:id="mainZone2">
......
<t:eventlink t:id="myLink" t:zone="myBoundZone" >
Click me.
</t:eventlink>
</t:zone>
</t:zone>
</form>
----------------------------------------------------------------------------------------------------------------------
@Environmental
private JavaScriptSupport javaScriptSupport;
@Inject
private Environment environment;
void onJavaScriptNeeded()
{
this.environment.push(JavaScriptSupport.class,
this.javaScriptSupport);
}
========================================================================
I don't know if the following matters, however:
* The zone the EventLink is bound to is defined only in the template (in
the Java code I never need to return that zone from any method or do anything
with it so I did not create any Zone field for that zone).
* In the template, the EventLink is itself inside a zone, which is nested
inside another zone.
* The "javaScriptNeeded" event occurs when the page is loaded. It does
not occur when I click the link.
Thanks for any possible hint.
org.apache.tapestry5.ioc.util.UnknownValueException: No object of type
org.apache.tapestry5.services.javascript.JavaScriptSupport is available from
the Environment.
at
org.apache.tapestry5.internal.services.EnvironmentImpl.peekRequired(EnvironmentImpl.java:96)
at $Environment_4a157190551.peekRequired(Unknown Source)
at $Environment_4a157190347.peekRequired(Unknown Source)
at
org.apache.tapestry5.internal.transform.EnvironmentalWorker$EnvironmentalConduit.get(EnvironmentalWorker.java:59)
at
mypackage.tapestry.pages.main.MyPage.conduit_get_javaScriptSupport(MyAccount.java)
at
mypackage.tapestry.pages.main.MyPage.onChangeCredentialsBtn(MyAccount.java:814)
at
mypackage.tapestry.pages.main.MyPage.dispatchComponentEvent(MyAccount.java)
at
org.apache.tapestry5.internal.structure.ComponentPageElementImpl.dispatchEvent(ComponentPageElementImpl.java:917)
at
org.apache.tapestry5.internal.structure.ComponentPageElementImpl.processEventTriggering(ComponentPageElementImpl.java:1102)
at
org.apache.tapestry5.internal.structure.ComponentPageElementImpl.access$3100(ComponentPageElementImpl.java:57)
at
org.apache.tapestry5.internal.structure.ComponentPageElementImpl$5.invoke(ComponentPageElementImpl.java:1047)
at
org.apache.tapestry5.internal.structure.ComponentPageElementImpl$5.invoke(ComponentPageElementImpl.java:1044)
at
org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:82)
at
org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:72)
at
org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1260)
at
org.apache.tapestry5.internal.structure.ComponentPageElementResourcesImpl.invoke(ComponentPageElementResourcesImpl.java:154)
at
org.apache.tapestry5.internal.structure.ComponentPageElementImpl.triggerContextEvent(ComponentPageElementImpl.java:1043)
at
org.apache.tapestry5.internal.services.AjaxComponentEventRequestHandler.handle(AjaxComponentEventRequestHandler.java:110)
at
org.apache.tapestry5.internal.services.ajax.AjaxFormUpdateFilter.handle(AjaxFormUpdateFilter.java:56)
at $ComponentEventRequestHandler_4a157190730.handle(Unknown
Source)
at $ComponentEventRequestHandler_4a157190574.handle(Unknown
Source)
at
org.apache.tapestry5.internal.services.AjaxFilter.handle(AjaxFilter.java:42)
at $ComponentEventRequestHandler_4a157190575.handle(Unknown
Source)
at
org.apache.tapestry5.upload.internal.services.UploadExceptionFilter.handle(UploadExceptionFilter.java:76)
at $ComponentEventRequestHandler_4a157190575.handle(Unknown
Source)
at
org.apache.tapestry5.modules.TapestryModule$37.handle(TapestryModule.java:2216)
at $ComponentEventRequestHandler_4a157190575.handle(Unknown
Source)
at $ComponentEventRequestHandler_4a157190441.handle(Unknown
Source)
at
org.apache.tapestry5.internal.services.ComponentRequestHandlerTerminator.handleComponentEvent(ComponentRequestHandlerTerminator.java:43)
at
org.apache.tapestry5.internal.services.DeferredResponseRenderer.handleComponentEvent(DeferredResponseRenderer.java:45)
at
$ComponentRequestHandler_4a157190443.handleComponentEvent(Unknown Source)
at
org.apache.tapestry5.services.InitializeActivePageName.handleComponentEvent(InitializeActivePageName.java:39)
at
$ComponentRequestHandler_4a157190443.handleComponentEvent(Unknown Source)
at
org.apache.tapestry5.internal.services.RequestOperationTracker$1.perform(RequestOperationTracker.java:55)
at
org.apache.tapestry5.internal.services.RequestOperationTracker$1.perform(RequestOperationTracker.java:52)
at
org.apache.tapestry5.ioc.internal.OperationTrackerImpl.perform(OperationTrackerImpl.java:110)
at
org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.perform(PerThreadOperationTracker.java:84)
at
org.apache.tapestry5.ioc.internal.RegistryImpl.perform(RegistryImpl.java:1266)
at
org.apache.tapestry5.internal.services.RequestOperationTracker.handleComponentEvent(RequestOperationTracker.java:47)
at
$ComponentRequestHandler_4a157190443.handleComponentEvent(Unknown Source)
....
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