5e3715fbe14fc37ab8ffe111c45282f10f565320
max
  Thu Jul 15 06:05:05 2021 -0700
changes after code review, refs #27846

diff --git src/hg/js/utils.js src/hg/js/utils.js
index 47ddf0c..c29a20f 100644
--- src/hg/js/utils.js
+++ src/hg/js/utils.js
@@ -3,30 +3,31 @@
 // "use strict";
 
 // Don't complain about line break before '||' etc:
 /* jshint -W014 */
 
 var debug = false;
 
 
 // Google Analytics helper functions to send events, see src/hg/lib/googleAnalytics.c
 
 function gaOnButtonClick(ev) {
 /* user clicked a button: send event to GA, then execute the old handler */
     var button = ev.currentTarget;
     var buttonName = button.name;
     ga('send', 'event', 'buttonClick', buttonName);
+    if (button.oldOnClick) // most buttons did not have an onclick function at all (the default click is a listener)
         button.oldOnClick(ev);
 }
 
 function gaTrackButtons() {
   /* replace the click handler on all buttons with one the sends a GA event first, then handles the click */
   if (!window.ga || ga.loaded) // When using an Adblocker, the ga object does not exist
       return;
   var buttons = document.querySelectorAll('input[type=submit],input[type=button]');
   for (var i = 0; i < buttons.length; i++) {
        var b = buttons[i];
        b.oldOnClick = b.onclick;
        b.onclick = gaOnButtonClick; // addEventHandler would not work here, the default click stops propagation.
   }
 }
 // end Google Analytics helper functions