[Piano] updated Piano sources2.2_release

Change-Id: I78648f109ae5f9af36f2b3692ee3d3f794c81b3f

1 files changed, 12 insertions, 2 deletions

diff --git a/js/main.js b/js/main.js
index fbbec59..986eb8a 100644
--- a/js/main.js
+++ b/js/main.js
@@ -52,6 +52,12 @@ function Piano() {
 		$('#back').bind('touchend', function (event) {
 			$(this).removeClass('active');
 		});
+
+		document.addEventListener('webkitvisibilitychange', function () {
+			if (document.webkitVisibilityState === 'visible') {
+				self.audioInit()
+			}
+		})
 	};
 
 	Piano.prototype.onPianoKeyTouchDown = function onPianoKeyTouchDown(data) {
@@ -107,8 +113,12 @@ function Piano() {
 		this.touchPianoKey[touchId] = element.id;
 		if (this.audio[nrAudio]) {
 			if (this.audio[nrAudio].src) {
-				this.audio[nrAudio].pause();
-				this.audio[nrAudio].currentTime = 0;
+				try {
+					this.audio[nrAudio].pause();
+					this.audio[nrAudio].currentTime = 0;
+				} catch (err) {
+					console.error(err);
+				}
 			} else {
 				this.audio[nrAudio].src = this.audio[nrAudio].name + ".wav";
 			}