From ed4a8b51c594fbbad0759b21677484911f077d51 Mon Sep 17 00:00:00 2001
From: Hakim El Hattab
Date: Sat, 27 Apr 2013 18:32:56 -0400
Subject: auto play/pause youtube video when entering/leaving slide (#388)

---
 js/reveal.js | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'js/reveal.js')

diff --git a/js/reveal.js b/js/reveal.js
index d321dde..82a0741 100644
--- a/js/reveal.js
+++ b/js/reveal.js
@@ -1430,11 +1430,19 @@ var Reveal = (function(){
 	function startEmbeddedContent( slide ) {
 
 		if( slide ) {
+			// HTML5 media elements
 			toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
 				if( !el.hasAttribute( 'data-ignore' ) ) {
 					el.play();
 				}
 			} );
+
+			// YouTube embeds
+			toArray( slide.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
+				if( !el.hasAttribute( 'data-ignore' ) ) {
+					el.contentWindow.postMessage('{"event":"command","func":"playVideo","args":""}', '*');
+				}
+			});
 		}
 
 	}
@@ -1446,11 +1454,19 @@ var Reveal = (function(){
 	function stopEmbeddedContent( slide ) {
 
 		if( slide ) {
+			// HTML5 media elements
 			toArray( slide.querySelectorAll( 'video, audio' ) ).forEach( function( el ) {
 				if( !el.hasAttribute( 'data-ignore' ) ) {
 					el.pause();
 				}
 			} );
+
+			// YouTube embeds
+			toArray( slide.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
+				if( !el.hasAttribute( 'data-ignore' ) && typeof el.contentWindow.postMessage === 'function' ) {
+					el.contentWindow.postMessage('{"event":"command","func":"pauseVideo","args":""}', '*');
+				}
+			});
 		}
 
 	}
-- 
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