diff --git a/js/src/util.js b/js/src/util.js
index cb37f320..1ffaa13f 100644
--- a/js/src/util.js
+++ b/js/src/util.js
@@ -61,7 +61,18 @@ const Util = (($) => {
       if (typeof event.which === 'undefined') {
         return true
       } else if (typeof event.which === 'number' && event.which > 0) {
-        return !event.ctrlKey && !event.metaKey && !event.altKey && event.which !== 8 && event.which !== 9
+        return (
+          !evt.ctrlKey
+          && !evt.metaKey
+          && !evt.altKey
+          && evt.which != 8  // backspace
+          && evt.which != 9  // tab
+          && evt.which != 13 // enter
+          && evt.which != 16 // shift
+          && evt.which != 17 // ctrl
+          && evt.which != 20 // caps lock
+          && evt.which != 27 // escape
+        )
       }
       return false
     },