fixed onclick binding

frontend/frontend.js

@@ -1,7 +1,5 @@
 // All code in this file is licensed under the ISC license, provided in LICENSE.txt
-$('#update').click(function () {
-  updateData();
-});
+$('#update').click(updateData);
 // jQuery event binder
 
 function updateData () {

frontend/index.html

@@ -25,7 +25,7 @@
   </div>
 
   <div class="container">
-    <button id="update" class="btn btn-primary">Get data</button>
+    <button id="update" onclick="updateData()" class="btn btn-primary">Get data</button>
     <button id="download" class="btn btn-primary">Download</button>
     <button id="debug" class="btn btn-danger">DEBUG</button>
   </div>