Thanks guys, that was it. Worked right away.
Now my problem is solved, but I'm wondering how off-track I was when I thought
that the Trigger component was the way to go about this. Is Trigger intended
for different situations, or is it just another possible appropriate way of
solving this problem, or would it have been possible to solve this using
Trigger but it wouldn't have been the right way ?
In any case, as usual I solved my problem by asking here, thanks again.
-----Original Message-----
From: JumpStart <geoff.callender.jumpst...@gmail.com>
Sent: Thursday, September 27, 2018 14:21
To: Tapestry users <users@tapestry.apache.org>
Subject: Re: Using JavaScript during Ajax request
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 <nat...@pensionarchitects.be>
> 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-JavaScriptSu
>> pport-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(MyPage.java)
>> at
>> mypackage.tapestry.pages.main.MyPage.onMyLink(MyPage.java:814)
>> at
>> mypackage.tapestry.pages.main.MyPage.dispatchComponentEvent(MyPage.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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