some minor alert shit

js/dist/dropdown.js

@@ -82,7 +82,7 @@ var Dropdown = (function ($) {
 
       value: function toggle() {
         if (this.disabled || $(this).hasClass(ClassName.DISABLED)) {
-          return;
+          return false;
         }
 
         var parent = Dropdown._getParentFromElement(this);
@@ -109,7 +109,7 @@ var Dropdown = (function ($) {
         $(parent).trigger(showEvent);
 
         if (showEvent.isDefaultPrevented()) {
-          return;
+          return false;
         }
 
         this.focus();
@@ -242,9 +242,19 @@ var Dropdown = (function ($) {
 
         var index = items.indexOf(event.target);
 
-        if (event.which === 38 && index > 0) index--; // up
-        if (event.which === 40 && index < items.length - 1) index++; // down
-        if (! ~index) index = 0;
+        if (event.which === 38 && index > 0) {
+          // up
+          index--;
+        }
+
+        if (event.which === 40 && index < items.length - 1) {
+          // down
+          index++;
+        }
+
+        if (! ~index) {
+          index = 0;
+        }
 
         items[index].focus();
       }