An example:
http://jumpstart.doublenegative.com.au/jumpstart/examples/javascript/modal/1
<http://jumpstart.doublenegative.com.au/jumpstart/examples/javascript/modal/1>
> On 27 Sep 2018, at 7:06 pm, Nathan Quirynen <[email protected]>
> wrote:
>
> 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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