[TAP5-1919] Hidden field component that participates with validation (ValidationTracker)

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Incomplete
• Affects Version/s: 5.3
• Component/s: tapestry-core
• Labels: bulk-close-candidate
• Assignee: Unassigned
• Reporter: Geoff Callender
• Created: 26/Apr/12 12:58
• Updated: 22/Aug/16 06:48
• Resolved: 22/Aug/16 06:48

Description

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

Issue Links

• is related to: TAP5-1812 Hidden component does't store submitted value if validation failed