From e8235bbc1277bfe3728658db1171ab908ce163b2 Mon Sep 17 00:00:00 2001
From: Mark Boas <markb@happyworm.com>
Date: Thu, 11 Feb 2021 13:19:16 +0100
Subject: [PATCH] 24 detects if Velocity has been placed on the jQuery object

---
 js/hyperaudio-lite.js | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/js/hyperaudio-lite.js b/js/hyperaudio-lite.js
index 691c9c4..0b33184 100644
--- a/js/hyperaudio-lite.js
+++ b/js/hyperaudio-lite.js
@@ -21,7 +21,8 @@ var hyperaudiolite = (function () {
     currentTime,
     windowHash,
     hashArray,
-    hashVar;
+    hashVar,
+    velocity;
 
 
   function init(mediaElementId, m) {
@@ -160,6 +161,8 @@ var hyperaudiolite = (function () {
         }
       }
     }
+
+    velocity = Velocity || jQuery.Velocity || window.jQuery.Velocity;
   }
 
   function getSelectionMediaFragment() {
@@ -346,11 +349,14 @@ var hyperaudiolite = (function () {
         }
 
         if (currentParaIndex != paraIndex) {
-          Velocity(scrollNode, "scroll", {
-            container: transcript,
-            duration: 800,
-            delay: 0
-          });
+
+          if (typeof velocity !== 'undefined') {
+            velocity(scrollNode, "scroll", {
+              container: transcript,
+              duration: 800,
+              delay: 0
+            });
+          }
 
           newPara = true;