Specific form errors should be linked with ARIA

[Jono M]

For sighted users, form errors which appear beside their associated fields are easy to see and correct, but it's not the case for screen reader users. These errors should be linked with aria-describedby in a similar way to element descriptions, so that screen reader users can more easily find and fix errors.

Affects latest master

(WCAG Level A)

[Mahara Bot (dev-mahara)]

Patch for "master" branch: https://reviews.mahara.org/2968

[Mahara Bot (dev-mahara)]

Reviewed: https://reviews.mahara.org/2968
Committed: http://gitorious.org/mahara/mahara/commit/ac0562725f4458e62aadb3fb670521afe67723f9
Submitter: Son Nguyen (<email address hidden>)
Branch: master

commit ac0562725f4458e62aadb3fb670521afe67723f9
Author: Jono Mingard <email address hidden>
Date: Wed Jan 29 09:42:20 2014 +1300

Use aria-describedby to link form errors to inputs (Bug #1273841)

New element_descriptors() method in pieforms to return a list of HTML IDs
which describe the given element (description, error or both) used by all
pieforms types which can logically use aria-describedby for some or all of
their elements.

Change-Id: Ie480b267f8c944dfe4e4bb6f185e8ce3ad8dd3ee
Signed-off-by: Jono Mingard <email address hidden>