[jira] [Updated] (TAP5-1919) A Hidden that is also tracked by Validation Tracker

["Geoff Callender (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TAP5-1919?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Geoff Callender updated TAP5-1919:
----------------------------------

    Summary: A Hidden that is also tracked by Validation Tracker  (was: Hidden is not tracked by Validation Tracker)
    
> A Hidden that is also tracked by Validation Tracker
> ---------------------------------------------------
>
>                 Key: TAP5-1919
>                 URL: https://issues.apache.org/jira/browse/TAP5-1919
>             Project: Tapestry 5
>          Issue Type: Improvement
>          Components: tapestry-core
>    Affects Versions: 5.3
>            Reporter: Geoff Callender
>
> Since Hidden is not tracked by the Validation Tracker, its value is lost when a page redirects to display validation errors. I'd like to see a new component, say Tracked. I guess it would be the same as Hidden and extend AbstractTextField or similar.
> Why? A common use case is to use Hidden for an entity's version field in a Form to provide optimistic locking. By using Tracked instead of Hidden I could do this...
> 	<form t:type="Form" t:id="person" >
>  		<t:tracked value="person.version"/>
>  		:
> 	</form>
> ...instead of this...
> 	<form t:type="Form" t:id="person" >
>  		<t:hidden value="person.version"/>
>  		:
> 	</form>
> 	// This carries version through the redirect that follows a server-side validation failure.
> 	@Persist(PersistenceConstants.FLASH)
> 	private Integer versionFlash;
> 	void onPrepareForRender() throws Exception {
> 		person = findPerson(personId);
> 		// If the form has errors then we're redisplaying after a redirect.
> 		// Form will restore your input values but it's up to us to restore Hidden values.
> 		if (form.getHasErrors()) {
> 			person.setVersion(versionFlash);
> 		}
> 	}
> 	
> 	void onFailure() {
> 		versionFlash = person.getVersion();
> 	}
> Thoughts?
> Geoff

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