A patch to CKEditor's image2 plugin, which makes the alt text field required.

make-ckeditor-image2-alt-text-required.patch

From f788a1a6c27be0fb421d2758492f9366b895ba20 Mon Sep 17 00:00:00 2001
From: Bryan Braun <[email protected]>
Date: Tue, 18 Nov 2014 14:43:17 -0500
Subject: [PATCH] Make the alt-text field required (and add a class for styling
 it).

Signed-off-by: Bryan Braun <[email protected]>
---
 dialogs/image2.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/dialogs/image2.js b/dialogs/image2.js
index 319be69..0fb7021 100644
--- a/dialogs/image2.js
+++ b/dialogs/image2.js
@@ -425,13 +425,15 @@ CKEDITOR.dialog.add( 'image2', function( editor ) {
 					{
 						id: 'alt',
 						type: 'text',
+            className: 'ck-alt-required',
 						label: lang.alt,
 						setup: function( widget ) {
 							this.setValue( widget.data.alt );
 						},
 						commit: function( widget ) {
 							widget.setData( 'alt', this.getValue() );
-						}
+						},
+            validate: CKEDITOR.dialog.validate.notEmpty( 'Alternative text is required.' )
 					},
 					{
 						type: 'hbox',
-- 
2.0.4