Example theme change

web/js/demo-js-interop.js

@@ -11,6 +11,21 @@
         btn.addEventListener('click', function() {
             appState.onTokenReceived('token123');
         })
+
+        let colorChangeBtnRed = document.getElementById('colorChangeBtnRed');
+        colorChangeBtnRed.addEventListener('click', function() {
+            var hexColor = '#FF0000'.replace(/^#?([a-f\d])([a-f\d])([a-f\d])$/i
+                , (m, r, g, b) => '#ff' + r + r + g + g + b + b).substring(1); 
+            var numColor = parseInt(hexColor, 16);
+            appState.changeColor(numColor)            
+        })
         
+        let colorChangeBtnBlue = document.getElementById('colorChangeBtnBlue');
+        colorChangeBtnBlue.addEventListener('click', function() {
+            var hexColor = '#0000FF'.replace(/^#?([a-f\d])([a-f\d])([a-f\d])$/i
+                , (m, r, g, b) => '#ff' + r + r + g + g + b + b).substring(1); 
+            var numColor = parseInt(hexColor, 16);
+            appState.changeColor(numColor)            
+        })
     }
 }());