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https://issues.apache.org/jira/browse/TAP5-1919?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13262635#comment-13262635
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Geoff Callender commented on TAP5-1919:
---------------------------------------
Is Tapestry 5.4 going to make this redundant by ditching the Post/Redirect/Get
pattern following server-side validation errors?
> 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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