[jira] Commented: (TAPESTRY-517) Using a FieldLabel component after the decorated form component causes the FieldLabel's id attribute to be wrong

["Jonas Maurus (JIRA)" <ta...@jakarta.apache.org>]

    [ http://issues.apache.org/jira/browse/TAPESTRY-517?page=comments#action_12317266 ] 

Jonas Maurus commented on TAPESTRY-517:
---------------------------------------

(sigh)... this only fixed the first half of the bug. If a FieldLabel for a form component is created after the component has rendered the FieldLabel creates a bogus component id in the "formids"-hidden field, causing the rewind to fail. Still digging...

> Using a FieldLabel component after the decorated form component causes the FieldLabel's id attribute to be wrong
> ----------------------------------------------------------------------------------------------------------------
>
>          Key: TAPESTRY-517
>          URL: http://issues.apache.org/jira/browse/TAPESTRY-517
>      Project: Tapestry
>         Type: Bug
>   Components: Framework
>     Versions: 4.0
>     Reporter: Jonas Maurus
>  Attachments: AbstractFormComponent.clientid_fix.diff
>
> Quoting from TAPESTRY-409:
> <!-- page definition -->
>   <component id="bookkeeperRCB" type="Checkbox">
>     <binding name="selected" value="hasBookkeeperRole" />
>   </component>
>   
>   <component id="adminRCB" type="Checkbox">
>     <binding name="selected" value="hasAdministratorRole" />
>   </component>
> <!-- page template -->
> <tr>
>   <td><input jwcid="bookkeeperRCB" type="checkbox" value="Y" /></td>
>   <td><label jwcid="@FieldLabel" for="bookkeeper"
>             field="ognl:components.bookkeeperRCB" displayName="message:form.roles.bookkeeper">Bookkeeper</label></td>
> </tr>
> <tr>
>   <td><input jwcid="adminRCB" type="checkbox" value="Y" /></td>
>   <td><label jwcid="@FieldLabel" for="admin"
>            field="ognl:components.adminRCB" displayName="message:form.roles.administrator">Administrator</label></td>
> </tr>
> yields:
> <tr>
>   <td><input type="checkbox" name="bookkeeperRCB" id="bookkeeperRCB" value="Y"/></td>
>   <td><label for="bookkeeperRCB$0">Bookkeeper</label></td>
> </tr>
> <tr>
>   <td><input type="checkbox" name="adminRCB" checked="checked" id="adminRCB" value="Y"/></td>
>   <td><label for="adminRCB$0">Administrator</label></td>
> </tr>
> as you can see the generated fieldnames ("bookkeeperRCB$0"...) are wrong. This always results in a stale-link exception.
> I tracked down the bug: FieldLabel calls prerenderField() which in turn causes an uniqueId to be allocated in AbstractFormComponent.renderIdAttribute. Everything works out when the FieldLabel precedes the form component it decorates. If it comes after the form component, IRequestCycle.getUniqueId() will already have stored an id for the component and return a new one.
> I'm not quite sure about the mechanics described above, as I don't fully understand FormSupportImpl yet, perhaps someone else can shed light on this.
> However, the allocated client id wasn't cached properly in AbstractFormComponent.renderIdAttribute. I'll attach a patch as soon as I've saved this bug report.

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