From: JJ Allaire <jj@rstudio.org>
Date: Thu, 14 Feb 2013 10:26:46 +0000 (-0500)
Subject: ontouchstart null check in addEventListeners
X-Git-Tag: 2.3.0~51^2
X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=2cfabed9f3337d2b0dd14b686050e7c9ad60c1ff;p=reveal.js.git

ontouchstart null check in addEventListeners
---

diff --git a/js/reveal.js b/js/reveal.js
index d315c89..7572569 100644
--- a/js/reveal.js
+++ b/js/reveal.js
@@ -408,7 +408,7 @@ var Reveal = (function(){
 		}
 
 		if ( config.controls && dom.controls ) {
-			var actionEvent = 'ontouchstart' in window ? 'touchstart' : 'click';
+			var actionEvent = 'ontouchstart' in window && window.ontouchstart != null ? 'touchstart' : 'click';
 			dom.controlsLeft.forEach( function( el ) { el.addEventListener( actionEvent, onNavigateLeftClicked, false ); } );
 			dom.controlsRight.forEach( function( el ) { el.addEventListener( actionEvent, onNavigateRightClicked, false ); } );
 			dom.controlsUp.forEach( function( el ) { el.addEventListener( actionEvent, onNavigateUpClicked, false ); } );