Patch to Fancybox that add accessibility improvement by disabling background tabbing and return focus to tabbed element after close. This feature can be turn on/off by setting the tabFocus option. Check this pull request for more info: https://github.com/fancyapps/fancyBox/pull/526

accessibility_patch.diff

# HG changeset patch
# User etienne <[email protected]>
# Date 1363923789 14400
# Node ID af13fed965d5dadc1b1cac9eb73a0be664f0101f
# Parent  532037e7911b9e9f7c06715117ad61873c6ccb9a
Added option to use tab key to focus prev, next and close navigation in fancybox.

diff --git a/mmac/utils/static/mmac/js/libs/fancybox/jquery.fancybox.js b/mmac/utils/static/mmac/js/libs/fancybox/jquery.fancybox.js
--- a/mmac/utils/static/mmac/js/libs/fancybox/jquery.fancybox.js
+++ b/mmac/utils/static/mmac/js/libs/fancybox/jquery.fancybox.js
@@ -15,6 +15,8 @@
 
 	var W = $(window),
 		D = $(document),
+		base_focusable_elements,
+
 		F = $.fancybox = function () {
 			F.open.apply( this, arguments );
 		},
@@ -171,6 +173,9 @@
 			prevEasing : 'swing',
 			prevMethod : 'changeOut',
 
+            // Disable tab key navigation on prev, next, close (used for accessibility)
+            tabFocus : false,
+
 			// Enable default helpers
 			helpers : {
 				overlay : true,
@@ -354,6 +359,13 @@
 
 			F.group = group;
 
+            if (F.opts && F.opts.tabFocus) {
+                // Remove enter key for next so it can be use to trigger
+                // focused navigation element
+                delete F.opts.keys.next[13];
+                F.fancybox_disable_base_elements();
+            }
+
 			return F._start(F.opts.index);
 		},
 
@@ -417,6 +429,10 @@
 				F.wrap.stop(true, true).removeClass('fancybox-opened');
 
 				F.transitions[ F.current.closeMethod ]();
+
+				if (F.current && F.current.tabFocus) {
+        			F.fancybox_enable_base_elements();
+				}
 			}
 		},
 
@@ -764,6 +780,25 @@
 			$.event.trigger(event + '.fb');
 		},
 
+        fancybox_disable_base_elements: function() {
+            // Special Credit and Thanks to whatcould's edit for fancyBox 1
+            // https://github.com/whatcould/fancybox/commit/231087ba1399d84589e29488cb98a2acb9e84624
+            base_focusable_elements.each(function(){
+                // push the previous tab-index into a data attrib
+                var el = $(this);
+                el.data('prev-tabindex', el.attr('tabindex'));
+                el.attr('tabindex', '-1');
+            });
+        },
+
+        fancybox_enable_base_elements: function() {
+            // reset the tabindex back to what we put in the data-attrib.
+            base_focusable_elements.each(function(){
+                var el = $(this);
+                el.attr('tabindex', el.data('prev-tabindex'));
+            });
+        },
+
 		isImage: function (str) {
 			return isString(str) && str.match(/(^data:image\/.*,)|(\.(jp(e|g|eg)|gif|png|bmp|webp)((\?|#).*)?$)/i);
 		},
@@ -1494,6 +1529,10 @@
 				inner  : null
 			});
 
+            if (obj.tabFocus) {
+                $(obj.element).focus();
+            }
+
 			F.trigger('afterClose', obj);
 		}
 	});
@@ -1962,6 +2001,10 @@
 			};
 		}
 
+        if (!base_focusable_elements) {
+            base_focusable_elements = $('a, input, button, select, textarea, iframe');
+        }
+
 		if ( $.support.fixedPosition === undefined ) {
 			$.support.fixedPosition = (function() {
 				var elem  = $('<div style="position:fixed;top:20px;"></div>').appendTo('body'),