From 7dbf07242083ac783595dab345dc9c41a54a6357 Mon Sep 17 00:00:00 2001
From: Louis Yu <yuluyi1991@gmail.com>
Date: Mon, 27 Mar 2017 11:16:25 +0800
Subject: [PATCH] feat: added syncEvent module

---
 react/syncEvent.js | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 react/syncEvent.js

diff --git a/react/syncEvent.js b/react/syncEvent.js
new file mode 100644
index 0000000..0292b83
--- /dev/null
+++ 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);
+    });
+  }
+}