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Posted to dev@tapestry.apache.org by "Geoff Callender (JIRA)" <de...@tapestry.apache.org> on 2008/09/08 14:08:46 UTC
[jira] Created: (TAPESTRY-2648) AJAX ActionLink exception if
clicked as page loads
AJAX ActionLink exception if clicked as page loads
--------------------------------------------------
Key: TAPESTRY-2648
URL: https://issues.apache.org/jira/browse/TAPESTRY-2648
Project: Tapestry
Issue Type: Bug
Affects Versions: 5.0.14
Reporter: Geoff Callender
I have a page with 2 ActionLinks - the first link updates the whole page; the second link specifies a zone.
If you click on the two links in quick succession then an exception is thrown. Alternatively, just Reload the page and click on the second link before the page has finished reloading and you'll get the same exception.
Here's the page, with source: http://202.177.217.122:8080/jumpstart/examples/javascript/ajax
Here's the exception:
A component event handler method returned the value org.apache.tapestry5.internal.structure.BlockImpl@80937b. Return type org.apache.tapestry5.internal.structure.BlockImpl can not be handled. Configured return types are java.lang.Class, java.lang.String, java.net.URL, org.apache.tapestry5.Link, org.apache.tapestry5.StreamResponse, org.apache.tapestry5.runtime.Component.
I understand that Tapestry doesn't hook up zones etc. until the DOM is loaded. It's also been suggested to "check Request#isXhr in your event handler to see if it's an AJAX request - if it's not you can't return a Block, so you'll have to figure out another way to do what needs to be done."
However, since this symptom will afflict every AJAX ActionLink out-of-the-box, it would be nice if the framework handled it so we don't have to code around it.
Geoff
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Re: [jira] Commented: (TAP5-1) AJAX ActionLink exception if clicked
as page loads
Posted by Angelo Turetta <at...@bestunion.it>.
Howard M. Lewis Ship (JIRA) wrote:
> [ https://issues.apache.org/jira/browse/TAP5-1?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12645281#action_12645281 ]
>
> Howard M. Lewis Ship commented on TAP5-1:
> -----------------------------------------
>
> This leaves, as a question, how to handle graceful degradation from Ajax to traditional (page oriented) behavior ... which was the intent of leaving the href unchanged even when zone parameter was bound.
I think this is worth a new 'Improvement' issue, just not to forget the
big TODO this fix leaves...
Angelo.
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[jira] Commented: (TAP5-1) AJAX ActionLink exception if clicked as
page loads
Posted by "Howard M. Lewis Ship (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/TAP5-1?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12645281#action_12645281 ]
Howard M. Lewis Ship commented on TAP5-1:
-----------------------------------------
I'm modifying the components to write out a href attribute as "#" (or action="#" for Form) and put the true URL in the JavaScript. This means the link will do nothing (possibly a page refresh, depending on browser) until the JavaScript links in. This leaves, as a question, how to handle graceful degradation from Ajax to traditional (page oriented) behavior ... which was the intent of leaving the href unchanged even when zone parameter was bound.
> AJAX ActionLink exception if clicked as page loads
> --------------------------------------------------
>
> Key: TAP5-1
> URL: https://issues.apache.org/jira/browse/TAP5-1
> Project: Tapestry 5
> Issue Type: Bug
> Affects Versions: 5.0.15
> Reporter: Geoff Callender
> Assignee: Howard M. Lewis Ship
>
> I have a page with 2 ActionLinks - the first link updates the whole page; the second link specifies a zone.
> If you click on the two links in quick succession then an exception is thrown. Alternatively, just Reload the page and click on the second link before the page has finished reloading and you'll get the same exception.
> Here's the page, with source: http://202.177.217.122:8080/jumpstart/examples/javascript/ajax
> Here's the exception:
> A component event handler method returned the value org.apache.tapestry5.internal.structure.BlockImpl@80937b. Return type org.apache.tapestry5.internal.structure.BlockImpl can not be handled. Configured return types are java.lang.Class, java.lang.String, java.net.URL, org.apache.tapestry5.Link, org.apache.tapestry5.StreamResponse, org.apache.tapestry5.runtime.Component.
> I understand that Tapestry doesn't hook up zones etc. until the DOM is loaded. It's also been suggested to "check Request#isXhr in your event handler to see if it's an AJAX request - if it's not you can't return a Block, so you'll have to figure out another way to do what needs to be done."
> However, since this symptom will afflict every AJAX ActionLink out-of-the-box, it would be nice if the framework handled it so we don't have to code around it.
> Geoff
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[jira] Commented: (TAPESTRY-2648) AJAX ActionLink exception if
clicked as page loads
Posted by "Howard M. Lewis Ship (JIRA)" <de...@tapestry.apache.org>.
[ https://issues.apache.org/jira/browse/TAPESTRY-2648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12630041#action_12630041 ]
Howard M. Lewis Ship commented on TAPESTRY-2648:
------------------------------------------------
I can't help but wonder if this is not a wide problem than just Tapestry; any application that uses Prototype and defers (as is strongly suggested) linking event handlers until the dom:loaded event may be subject to this.
What would be necessary to fully address this would be to use different actions for traditional requests vs. Ajax requests, so that a traditional request can be identified in the Ajax pipeline and ... what? Ignored? That wouldn't work either, you'd see a blank page after clicking what looked like an Ajax link.
> AJAX ActionLink exception if clicked as page loads
> --------------------------------------------------
>
> Key: TAPESTRY-2648
> URL: https://issues.apache.org/jira/browse/TAPESTRY-2648
> Project: Tapestry
> Issue Type: Bug
> Components: tapestry-core
> Affects Versions: 5.0.14
> Reporter: Geoff Callender
>
> I have a page with 2 ActionLinks - the first link updates the whole page; the second link specifies a zone.
> If you click on the two links in quick succession then an exception is thrown. Alternatively, just Reload the page and click on the second link before the page has finished reloading and you'll get the same exception.
> Here's the page, with source: http://202.177.217.122:8080/jumpstart/examples/javascript/ajax
> Here's the exception:
> A component event handler method returned the value org.apache.tapestry5.internal.structure.BlockImpl@80937b. Return type org.apache.tapestry5.internal.structure.BlockImpl can not be handled. Configured return types are java.lang.Class, java.lang.String, java.net.URL, org.apache.tapestry5.Link, org.apache.tapestry5.StreamResponse, org.apache.tapestry5.runtime.Component.
> I understand that Tapestry doesn't hook up zones etc. until the DOM is loaded. It's also been suggested to "check Request#isXhr in your event handler to see if it's an AJAX request - if it's not you can't return a Block, so you'll have to figure out another way to do what needs to be done."
> However, since this symptom will afflict every AJAX ActionLink out-of-the-box, it would be nice if the framework handled it so we don't have to code around it.
> Geoff
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[jira] Updated: (TAP5-1) Clicking on a link that updates a zone
before the page has fully loaded will result in a full page update and,
often, a server-side exception
Posted by "Howard M. Lewis Ship (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/TAP5-1?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Howard M. Lewis Ship updated TAP5-1:
------------------------------------
Summary: Clicking on a link that updates a zone before the page has fully loaded will result in a full page update and, often, a server-side exception (was: AJAX ActionLink exception if clicked as page loads)
> Clicking on a link that updates a zone before the page has fully loaded will result in a full page update and, often, a server-side exception
> ---------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: TAP5-1
> URL: https://issues.apache.org/jira/browse/TAP5-1
> Project: Tapestry 5
> Issue Type: Bug
> Affects Versions: 5.0.15
> Reporter: Geoff Callender
> Assignee: Howard M. Lewis Ship
> Fix For: 5.0.16
>
>
> I have a page with 2 ActionLinks - the first link updates the whole page; the second link specifies a zone.
> If you click on the two links in quick succession then an exception is thrown. Alternatively, just Reload the page and click on the second link before the page has finished reloading and you'll get the same exception.
> Here's the page, with source: http://202.177.217.122:8080/jumpstart/examples/javascript/ajax
> Here's the exception:
> A component event handler method returned the value org.apache.tapestry5.internal.structure.BlockImpl@80937b. Return type org.apache.tapestry5.internal.structure.BlockImpl can not be handled. Configured return types are java.lang.Class, java.lang.String, java.net.URL, org.apache.tapestry5.Link, org.apache.tapestry5.StreamResponse, org.apache.tapestry5.runtime.Component.
> I understand that Tapestry doesn't hook up zones etc. until the DOM is loaded. It's also been suggested to "check Request#isXhr in your event handler to see if it's an AJAX request - if it's not you can't return a Block, so you'll have to figure out another way to do what needs to be done."
> However, since this symptom will afflict every AJAX ActionLink out-of-the-box, it would be nice if the framework handled it so we don't have to code around it.
> Geoff
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[jira] Commented: (TAP5-1) Clicking on a link that updates a zone
before the page has fully loaded will result in a full page update and,
often, a server-side exception
Posted by "Inge Solvoll (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/TAP5-1?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12650187#action_12650187 ]
Inge Solvoll commented on TAP5-1:
---------------------------------
I tried someting now. Actually, if you just add the following in the link:
onclick= function() {return false;}
the link just does not respond to clicks before it has been zone-initialized by tapestry. Apparently, the zone-init replaces this onclick function, and voila, I avoid the ugly crash.
Better than crashing, IMO.
> Clicking on a link that updates a zone before the page has fully loaded will result in a full page update and, often, a server-side exception
> ---------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: TAP5-1
> URL: https://issues.apache.org/jira/browse/TAP5-1
> Project: Tapestry 5
> Issue Type: Bug
> Affects Versions: 5.0.15
> Reporter: Geoff Callender
> Assignee: Howard M. Lewis Ship
> Fix For: 5.0.16
>
>
> I have a page with 2 ActionLinks - the first link updates the whole page; the second link specifies a zone.
> If you click on the two links in quick succession then an exception is thrown. Alternatively, just Reload the page and click on the second link before the page has finished reloading and you'll get the same exception.
> Here's the page, with source: http://202.177.217.122:8080/jumpstart/examples/javascript/ajax
> Here's the exception:
> A component event handler method returned the value org.apache.tapestry5.internal.structure.BlockImpl@80937b. Return type org.apache.tapestry5.internal.structure.BlockImpl can not be handled. Configured return types are java.lang.Class, java.lang.String, java.net.URL, org.apache.tapestry5.Link, org.apache.tapestry5.StreamResponse, org.apache.tapestry5.runtime.Component.
> I understand that Tapestry doesn't hook up zones etc. until the DOM is loaded. It's also been suggested to "check Request#isXhr in your event handler to see if it's an AJAX request - if it's not you can't return a Block, so you'll have to figure out another way to do what needs to be done."
> However, since this symptom will afflict every AJAX ActionLink out-of-the-box, it would be nice if the framework handled it so we don't have to code around it.
> Geoff
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[jira] Closed: (TAP5-1) Clicking on a link that updates a zone
before the page has fully loaded will result in a full page update and,
often, a server-side exception
Posted by "Howard M. Lewis Ship (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/TAP5-1?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Howard M. Lewis Ship closed TAP5-1.
-----------------------------------
Resolution: Fixed
Fix Version/s: 5.0.16
> Clicking on a link that updates a zone before the page has fully loaded will result in a full page update and, often, a server-side exception
> ---------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: TAP5-1
> URL: https://issues.apache.org/jira/browse/TAP5-1
> Project: Tapestry 5
> Issue Type: Bug
> Affects Versions: 5.0.15
> Reporter: Geoff Callender
> Assignee: Howard M. Lewis Ship
> Fix For: 5.0.16
>
>
> I have a page with 2 ActionLinks - the first link updates the whole page; the second link specifies a zone.
> If you click on the two links in quick succession then an exception is thrown. Alternatively, just Reload the page and click on the second link before the page has finished reloading and you'll get the same exception.
> Here's the page, with source: http://202.177.217.122:8080/jumpstart/examples/javascript/ajax
> Here's the exception:
> A component event handler method returned the value org.apache.tapestry5.internal.structure.BlockImpl@80937b. Return type org.apache.tapestry5.internal.structure.BlockImpl can not be handled. Configured return types are java.lang.Class, java.lang.String, java.net.URL, org.apache.tapestry5.Link, org.apache.tapestry5.StreamResponse, org.apache.tapestry5.runtime.Component.
> I understand that Tapestry doesn't hook up zones etc. until the DOM is loaded. It's also been suggested to "check Request#isXhr in your event handler to see if it's an AJAX request - if it's not you can't return a Block, so you'll have to figure out another way to do what needs to be done."
> However, since this symptom will afflict every AJAX ActionLink out-of-the-box, it would be nice if the framework handled it so we don't have to code around it.
> Geoff
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[jira] Commented: (TAP5-1) Clicking on a link that updates a zone
before the page has fully loaded will result in a full page update and,
often, a server-side exception
Posted by "Inge Solvoll (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/TAP5-1?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12649348#action_12649348 ]
Inge Solvoll commented on TAP5-1:
---------------------------------
I agree with Thiago, graceful degradation is important and I would like to keep the link in the href.
If you have many links on the page that needs zone init, it is very likely that the user will click one of them before init is complete. Of course, if I was serious about graceful degradation, I should have already provided a non-XHR fallback and I wouldn't be barking up the T5-tree :)
Having said that, I would like an elegant solution to enable my XHR-enabled clients to avoid this problem. A javascript event telling me that tapestry init has finished would be helpful. Thiagos suggestion in the previous post, disabling/hiding links with javascript, is probably a good default behaviour. After all, in most cases the links will display right away anyway and the user won't notice that they were gone.
> Clicking on a link that updates a zone before the page has fully loaded will result in a full page update and, often, a server-side exception
> ---------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: TAP5-1
> URL: https://issues.apache.org/jira/browse/TAP5-1
> Project: Tapestry 5
> Issue Type: Bug
> Affects Versions: 5.0.15
> Reporter: Geoff Callender
> Assignee: Howard M. Lewis Ship
> Fix For: 5.0.16
>
>
> I have a page with 2 ActionLinks - the first link updates the whole page; the second link specifies a zone.
> If you click on the two links in quick succession then an exception is thrown. Alternatively, just Reload the page and click on the second link before the page has finished reloading and you'll get the same exception.
> Here's the page, with source: http://202.177.217.122:8080/jumpstart/examples/javascript/ajax
> Here's the exception:
> A component event handler method returned the value org.apache.tapestry5.internal.structure.BlockImpl@80937b. Return type org.apache.tapestry5.internal.structure.BlockImpl can not be handled. Configured return types are java.lang.Class, java.lang.String, java.net.URL, org.apache.tapestry5.Link, org.apache.tapestry5.StreamResponse, org.apache.tapestry5.runtime.Component.
> I understand that Tapestry doesn't hook up zones etc. until the DOM is loaded. It's also been suggested to "check Request#isXhr in your event handler to see if it's an AJAX request - if it's not you can't return a Block, so you'll have to figure out another way to do what needs to be done."
> However, since this symptom will afflict every AJAX ActionLink out-of-the-box, it would be nice if the framework handled it so we don't have to code around it.
> Geoff
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[jira] Commented: (TAP5-1) Clicking on a link that updates a zone
before the page has fully loaded will result in a full page update and,
often, a server-side exception
Posted by "Inge Solvoll (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/TAP5-1?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12649351#action_12649351 ]
Inge Solvoll commented on TAP5-1:
---------------------------------
The big question is: what global event should trigger the javascript that disables the links? It sure can't be dom:loaded together with zone-init, which would leave the situation pretty much unchanged :)
Maybe inline javascript (this.onclick = function() {return false}) generated server side based on information from the request?
> Clicking on a link that updates a zone before the page has fully loaded will result in a full page update and, often, a server-side exception
> ---------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: TAP5-1
> URL: https://issues.apache.org/jira/browse/TAP5-1
> Project: Tapestry 5
> Issue Type: Bug
> Affects Versions: 5.0.15
> Reporter: Geoff Callender
> Assignee: Howard M. Lewis Ship
> Fix For: 5.0.16
>
>
> I have a page with 2 ActionLinks - the first link updates the whole page; the second link specifies a zone.
> If you click on the two links in quick succession then an exception is thrown. Alternatively, just Reload the page and click on the second link before the page has finished reloading and you'll get the same exception.
> Here's the page, with source: http://202.177.217.122:8080/jumpstart/examples/javascript/ajax
> Here's the exception:
> A component event handler method returned the value org.apache.tapestry5.internal.structure.BlockImpl@80937b. Return type org.apache.tapestry5.internal.structure.BlockImpl can not be handled. Configured return types are java.lang.Class, java.lang.String, java.net.URL, org.apache.tapestry5.Link, org.apache.tapestry5.StreamResponse, org.apache.tapestry5.runtime.Component.
> I understand that Tapestry doesn't hook up zones etc. until the DOM is loaded. It's also been suggested to "check Request#isXhr in your event handler to see if it's an AJAX request - if it's not you can't return a Block, so you'll have to figure out another way to do what needs to be done."
> However, since this symptom will afflict every AJAX ActionLink out-of-the-box, it would be nice if the framework handled it so we don't have to code around it.
> Geoff
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[jira] Commented: (TAP5-1) AJAX ActionLink exception if clicked as
page loads
Posted by "Geoff Callender (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/TAP5-1?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12645188#action_12645188 ]
Geoff Callender commented on TAP5-1:
------------------------------------
Indeed, that's what I ended up doing in that page.
> AJAX ActionLink exception if clicked as page loads
> --------------------------------------------------
>
> Key: TAP5-1
> URL: https://issues.apache.org/jira/browse/TAP5-1
> Project: Tapestry 5
> Issue Type: Bug
> Affects Versions: 5.0.15
> Reporter: Geoff Callender
>
> I have a page with 2 ActionLinks - the first link updates the whole page; the second link specifies a zone.
> If you click on the two links in quick succession then an exception is thrown. Alternatively, just Reload the page and click on the second link before the page has finished reloading and you'll get the same exception.
> Here's the page, with source: http://202.177.217.122:8080/jumpstart/examples/javascript/ajax
> Here's the exception:
> A component event handler method returned the value org.apache.tapestry5.internal.structure.BlockImpl@80937b. Return type org.apache.tapestry5.internal.structure.BlockImpl can not be handled. Configured return types are java.lang.Class, java.lang.String, java.net.URL, org.apache.tapestry5.Link, org.apache.tapestry5.StreamResponse, org.apache.tapestry5.runtime.Component.
> I understand that Tapestry doesn't hook up zones etc. until the DOM is loaded. It's also been suggested to "check Request#isXhr in your event handler to see if it's an AJAX request - if it's not you can't return a Block, so you'll have to figure out another way to do what needs to be done."
> However, since this symptom will afflict every AJAX ActionLink out-of-the-box, it would be nice if the framework handled it so we don't have to code around it.
> Geoff
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[jira] Assigned: (TAP5-1) AJAX ActionLink exception if clicked as
page loads
Posted by "Howard M. Lewis Ship (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/TAP5-1?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Howard M. Lewis Ship reassigned TAP5-1:
---------------------------------------
Assignee: Howard M. Lewis Ship
> AJAX ActionLink exception if clicked as page loads
> --------------------------------------------------
>
> Key: TAP5-1
> URL: https://issues.apache.org/jira/browse/TAP5-1
> Project: Tapestry 5
> Issue Type: Bug
> Affects Versions: 5.0.15
> Reporter: Geoff Callender
> Assignee: Howard M. Lewis Ship
>
> I have a page with 2 ActionLinks - the first link updates the whole page; the second link specifies a zone.
> If you click on the two links in quick succession then an exception is thrown. Alternatively, just Reload the page and click on the second link before the page has finished reloading and you'll get the same exception.
> Here's the page, with source: http://202.177.217.122:8080/jumpstart/examples/javascript/ajax
> Here's the exception:
> A component event handler method returned the value org.apache.tapestry5.internal.structure.BlockImpl@80937b. Return type org.apache.tapestry5.internal.structure.BlockImpl can not be handled. Configured return types are java.lang.Class, java.lang.String, java.net.URL, org.apache.tapestry5.Link, org.apache.tapestry5.StreamResponse, org.apache.tapestry5.runtime.Component.
> I understand that Tapestry doesn't hook up zones etc. until the DOM is loaded. It's also been suggested to "check Request#isXhr in your event handler to see if it's an AJAX request - if it's not you can't return a Block, so you'll have to figure out another way to do what needs to be done."
> However, since this symptom will afflict every AJAX ActionLink out-of-the-box, it would be nice if the framework handled it so we don't have to code around it.
> Geoff
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[jira] Commented: (TAP5-1) AJAX ActionLink exception if clicked as
page loads
Posted by "Howard M. Lewis Ship (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/TAP5-1?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12645114#action_12645114 ]
Howard M. Lewis Ship commented on TAP5-1:
-----------------------------------------
Further, your code can inject the Request object and check its .isXHR() method to determine what to return: probably this (the current page object) for a non-Ajax request.
> AJAX ActionLink exception if clicked as page loads
> --------------------------------------------------
>
> Key: TAP5-1
> URL: https://issues.apache.org/jira/browse/TAP5-1
> Project: Tapestry 5
> Issue Type: Bug
> Affects Versions: 5.0.15
> Reporter: Geoff Callender
>
> I have a page with 2 ActionLinks - the first link updates the whole page; the second link specifies a zone.
> If you click on the two links in quick succession then an exception is thrown. Alternatively, just Reload the page and click on the second link before the page has finished reloading and you'll get the same exception.
> Here's the page, with source: http://202.177.217.122:8080/jumpstart/examples/javascript/ajax
> Here's the exception:
> A component event handler method returned the value org.apache.tapestry5.internal.structure.BlockImpl@80937b. Return type org.apache.tapestry5.internal.structure.BlockImpl can not be handled. Configured return types are java.lang.Class, java.lang.String, java.net.URL, org.apache.tapestry5.Link, org.apache.tapestry5.StreamResponse, org.apache.tapestry5.runtime.Component.
> I understand that Tapestry doesn't hook up zones etc. until the DOM is loaded. It's also been suggested to "check Request#isXhr in your event handler to see if it's an AJAX request - if it's not you can't return a Block, so you'll have to figure out another way to do what needs to be done."
> However, since this symptom will afflict every AJAX ActionLink out-of-the-box, it would be nice if the framework handled it so we don't have to code around it.
> Geoff
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[jira] Updated: (TAPESTRY-2648) AJAX ActionLink exception if
clicked as page loads
Posted by "Geoff Callender (JIRA)" <de...@tapestry.apache.org>.
[ https://issues.apache.org/jira/browse/TAPESTRY-2648?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Geoff Callender updated TAPESTRY-2648:
--------------------------------------
Component/s: tapestry-core
> AJAX ActionLink exception if clicked as page loads
> --------------------------------------------------
>
> Key: TAPESTRY-2648
> URL: https://issues.apache.org/jira/browse/TAPESTRY-2648
> Project: Tapestry
> Issue Type: Bug
> Components: tapestry-core
> Affects Versions: 5.0.14
> Reporter: Geoff Callender
>
> I have a page with 2 ActionLinks - the first link updates the whole page; the second link specifies a zone.
> If you click on the two links in quick succession then an exception is thrown. Alternatively, just Reload the page and click on the second link before the page has finished reloading and you'll get the same exception.
> Here's the page, with source: http://202.177.217.122:8080/jumpstart/examples/javascript/ajax
> Here's the exception:
> A component event handler method returned the value org.apache.tapestry5.internal.structure.BlockImpl@80937b. Return type org.apache.tapestry5.internal.structure.BlockImpl can not be handled. Configured return types are java.lang.Class, java.lang.String, java.net.URL, org.apache.tapestry5.Link, org.apache.tapestry5.StreamResponse, org.apache.tapestry5.runtime.Component.
> I understand that Tapestry doesn't hook up zones etc. until the DOM is loaded. It's also been suggested to "check Request#isXhr in your event handler to see if it's an AJAX request - if it's not you can't return a Block, so you'll have to figure out another way to do what needs to be done."
> However, since this symptom will afflict every AJAX ActionLink out-of-the-box, it would be nice if the framework handled it so we don't have to code around it.
> Geoff
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[jira] Commented: (TAP5-1) Clicking on a link that updates a zone
before the page has fully loaded will result in a full page update and,
often, a server-side exception
Posted by "Thiago H. de Paula Figueiredo (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/TAP5-1?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12649338#action_12649338 ]
Thiago H. de Paula Figueiredo commented on TAP5-1:
--------------------------------------------------
I would really like this href="#" behaviour to be rolled back, because it completely prevents the graceful degradation of AJAX links. One other possible solution would be to generate links as before, but use JavaScript to disable them. When the DOM is fully loaded, reenable the links through JavaScript.
> Clicking on a link that updates a zone before the page has fully loaded will result in a full page update and, often, a server-side exception
> ---------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: TAP5-1
> URL: https://issues.apache.org/jira/browse/TAP5-1
> Project: Tapestry 5
> Issue Type: Bug
> Affects Versions: 5.0.15
> Reporter: Geoff Callender
> Assignee: Howard M. Lewis Ship
> Fix For: 5.0.16
>
>
> I have a page with 2 ActionLinks - the first link updates the whole page; the second link specifies a zone.
> If you click on the two links in quick succession then an exception is thrown. Alternatively, just Reload the page and click on the second link before the page has finished reloading and you'll get the same exception.
> Here's the page, with source: http://202.177.217.122:8080/jumpstart/examples/javascript/ajax
> Here's the exception:
> A component event handler method returned the value org.apache.tapestry5.internal.structure.BlockImpl@80937b. Return type org.apache.tapestry5.internal.structure.BlockImpl can not be handled. Configured return types are java.lang.Class, java.lang.String, java.net.URL, org.apache.tapestry5.Link, org.apache.tapestry5.StreamResponse, org.apache.tapestry5.runtime.Component.
> I understand that Tapestry doesn't hook up zones etc. until the DOM is loaded. It's also been suggested to "check Request#isXhr in your event handler to see if it's an AJAX request - if it's not you can't return a Block, so you'll have to figure out another way to do what needs to be done."
> However, since this symptom will afflict every AJAX ActionLink out-of-the-box, it would be nice if the framework handled it so we don't have to code around it.
> Geoff
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[jira] Commented: (TAP5-1) Clicking on a link that updates a zone
before the page has fully loaded will result in a full page update and,
often, a server-side exception
Posted by "Thiago H. de Paula Figueiredo (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/TAP5-1?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12649349#action_12649349 ]
Thiago H. de Paula Figueiredo commented on TAP5-1:
--------------------------------------------------
Inge said: "After all, in most cases the links will display right away anyway and the user won't notice that they were gone."
Just to make my opinion clear, I'm not suggesting that the links should be hidden, just disable them (when they're clicked, they do nothing, but still appear in the page).
> Clicking on a link that updates a zone before the page has fully loaded will result in a full page update and, often, a server-side exception
> ---------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: TAP5-1
> URL: https://issues.apache.org/jira/browse/TAP5-1
> Project: Tapestry 5
> Issue Type: Bug
> Affects Versions: 5.0.15
> Reporter: Geoff Callender
> Assignee: Howard M. Lewis Ship
> Fix For: 5.0.16
>
>
> I have a page with 2 ActionLinks - the first link updates the whole page; the second link specifies a zone.
> If you click on the two links in quick succession then an exception is thrown. Alternatively, just Reload the page and click on the second link before the page has finished reloading and you'll get the same exception.
> Here's the page, with source: http://202.177.217.122:8080/jumpstart/examples/javascript/ajax
> Here's the exception:
> A component event handler method returned the value org.apache.tapestry5.internal.structure.BlockImpl@80937b. Return type org.apache.tapestry5.internal.structure.BlockImpl can not be handled. Configured return types are java.lang.Class, java.lang.String, java.net.URL, org.apache.tapestry5.Link, org.apache.tapestry5.StreamResponse, org.apache.tapestry5.runtime.Component.
> I understand that Tapestry doesn't hook up zones etc. until the DOM is loaded. It's also been suggested to "check Request#isXhr in your event handler to see if it's an AJAX request - if it's not you can't return a Block, so you'll have to figure out another way to do what needs to be done."
> However, since this symptom will afflict every AJAX ActionLink out-of-the-box, it would be nice if the framework handled it so we don't have to code around it.
> Geoff
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