fix(demos): debounce setRoot call

demos/component-docs/helpers.ts

@@ -68,3 +68,18 @@ export function getPageFor(hash) {
         'tabs': TabsPage
     }[hash]
 }
+
+export function debounce(func, wait, immediate) {
+    var timeout;
+    return function() {
+        var context = this, args = arguments;
+        var later = function() {
+            timeout = null;
+            if (!immediate) func.apply(context, args);
+        };
+        var callNow = immediate && !timeout;
+        clearTimeout(timeout);
+        timeout = setTimeout(later, wait);
+        if (callNow) func.apply(context, args);
+    };
+};

demos/component-docs/index.ts

@@ -26,7 +26,7 @@ class DemoApp {
               this.nextPage = ActionSheetPage;
             }
             let nav = this.app.getComponent('nav');
-            nav.setRoot(this.nextPage);
+            helpers.debounce(nav.setRoot(this.nextPage), 100, true);
           }
         });
       });