From 550795445e04a1b2c985ce2f58b125d0abe2817d Mon Sep 17 00:00:00 2001
From: Ben Alpert <spicyjalapeno@gmail.com>
Date: Mon, 19 May 2014 11:42:37 -0700
Subject: [PATCH] Use Object.prototype.hasOwnProperty for doc in IE8

Test Plan: Loaded ballmer-peak example in IE8 without errors and interacted with the text field.
---
 src/browser/ReactEventEmitter.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/browser/ReactEventEmitter.js b/src/browser/ReactEventEmitter.js
index 5481c2e9b8..5f1956d7d9 100644
--- a/src/browser/ReactEventEmitter.js
+++ b/src/browser/ReactEventEmitter.js
@@ -129,7 +129,9 @@ var topEventMapping = {
 var topListenersIDKey = "_reactListenersID" + String(Math.random()).slice(2);
 
 function getListeningForDocument(mountAt) {
-  if (!mountAt.hasOwnProperty(topListenersIDKey)) {
+  // In IE8, `mountAt` is a host object and doesn't have `hasOwnProperty`
+  // directly.
+  if (!Object.prototype.hasOwnProperty.call(mountAt, topListenersIDKey)) {
     mountAt[topListenersIDKey] = reactTopListenersCounter++;
     alreadyListeningTo[mountAt[topListenersIDKey]] = {};
   }