Allow specific custom events to exit trigger early if there are no handlers bound...

diff --git a/src/event.js b/src/event.js
index 9a63b5f93e0910221ccfff1602520ceb0993d151..d39bf7ac0bce2eaa9c8a7bc25f3b0ba41e283833 100644 (file)
--- a/src/event.js
+++ b/src/event.js
@@ -276,6 +276,14 @@ jQuery.event = {
                        }
                }
        },
+       
+       // Events that are safe to short-circuit if no handlers are attached.
+       // Native DOM events should not be added, they may have inline handlers.
+       customEvent: {
+               "getData": true,
+               "setData": true,
+               "changeData": true
+       },
 
        trigger: function( event, data, elem ) {
                // Event object or event type
@@ -293,7 +301,7 @@ jQuery.event = {
                        jQuery.Event(type);
 
                if ( type.indexOf("!") >= 0 ) {
-               // Exclusive events trigger only for the bare event type (no namespaces)
+                       // Exclusive events trigger only for the bare event type (no namespaces)
                        event.type = type = type.slice(0, -1);
                        event.exclusive = true;
                }
@@ -305,7 +313,12 @@ jQuery.event = {
                }
                event.namespace = namespaces.join(".");
                event.namespace_re = new RegExp("(^|\\.)" + namespaces.join("\\.(?:.*\\.)?") + "(\\.|$)");
-               
+
+               if ( jQuery.event.customEvent[ type ] && !jQuery.event.global[ type ] ) {
+                       // No jQuery handlers for this event type, and it can't have inline handlers
+                       return;
+               }
+
                // Handle a global trigger
                if ( !elem ) {
                        // Don't bubble custom events when global (to avoid too much overhead)