[BUGFIX] Abort submit if required fields are not filled

Resolves: #71497
Releases: master
Change-Id: I7f4d8336735c872ca049799a0844b827f5ab3ee6
Reviewed-on: https://review.typo3.org/44693


Reviewed-by: Andreas Allacher <andreas.allacher@gmx.at>
Tested-by: Andreas Allacher <andreas.allacher@gmx.at>
Reviewed-by: Michael Oehlhof <typo3@oehlhof.de>
Tested-by: Michael Oehlhof <typo3@oehlhof.de>
Reviewed-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Tested-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Andreas Fernandez <typo3@scripting-base.de>

typo3/sysext/backend/Resources/Public/JavaScript/SplitButtons.js

@@ -54,6 +54,10 @@ define(['jquery', 'TYPO3/CMS/Backend/Icons'], function($, Icons) {
 
 			// Disable submit buttons
 			$form.on('submit', function() {
+				if ($form.find('.has-error').length > 0) {
+					return false;
+				}
+
 				var $affectedButton,
 					$splitButton = $me.closest('.t3js-splitbutton');