feat: added syncEvent module

vagusX · Mar 27, 2017 · 7dbf072 · 7dbf072
1 parent 41cced3
commit 7dbf072
Showing 1 changed file with 17 additions and 0 deletions.
diff --git a/react/syncEvent.js b/react/syncEvent.js
@@ -0,0 +1,17 @@
+module.exports = function syncEvent(node, eventName, newEventHandler) {
+  var eventNameLc = eventName[0].toLowerCase() + eventName.substring(1);
+  var eventStore = node.__events || (node.__events = {});
+  var oldEventHandler = eventStore[eventNameLc];
+
+  // Remove old listener so they don't double up.
+  if (oldEventHandler) {
+    node.removeEventListener(eventNameLc, oldEventHandler);
+  }
+
+  // Bind new listener.
+  if (newEventHandler) {
+    node.addEventListener(eventNameLc, eventStore[eventNameLc] = function handler(e) {
+      newEventHandler.call(this, e);
+    });
+  }
+}