From 8039eae2d2b3a749c3ddc711ce5b5cfd708f1a23 Mon Sep 17 00:00:00 2001
From: Adam Bradley <adambradley25@gmail.com>
Date: Mon, 14 Sep 2015 23:20:17 -0500
Subject: [PATCH] prevent double navigations to the same view

---
 ionic/components/nav/nav-router.ts       |  5 +++++
 ionic/components/view/view-controller.ts | 28 ++++++++++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/ionic/components/nav/nav-router.ts b/ionic/components/nav/nav-router.ts
index 36b1230cb0..f76488ceb6 100644
--- a/ionic/components/nav/nav-router.ts
+++ b/ionic/components/nav/nav-router.ts
@@ -49,6 +49,11 @@ export class NavRouter extends RouterOutlet {
     var componentType = nextInstruction.componentType;
     var childRouter = this._parentRouter.childRouter(componentType);
 
+    // prevent double navigations to the same view
+    var lastView = this.nav.last();
+    if (lastView && lastView.componentType === componentType && lastView.params.data === nextInstruction.params) {
+      return Promise.resolve();
+    }
 
     // tell the ViewController which componentType, and it's params, to navigate to
     return this.nav.push(componentType, nextInstruction.params);
diff --git a/ionic/components/view/view-controller.ts b/ionic/components/view/view-controller.ts
index dfdff88c1f..9a795a2060 100644
--- a/ionic/components/view/view-controller.ts
+++ b/ionic/components/view/view-controller.ts
@@ -640,6 +640,34 @@ export class ViewController extends Ion {
     util.array.remove(this.items, itemOrIndex);
   }
 
+  /**
+   * First view item in this view controller's stack. This would
+   * not return an item which is about to be destroyed.
+   * @returns {TODO} TODO
+   */
+  first() {
+    for (let i = 0, l = this.items.length; i < l; i++) {
+      if (!this.items[i].shouldDestroy) {
+        return this.items[i];
+      }
+    }
+    return null;
+  }
+
+  /**
+   * Last view item in this view controller's stack. This would
+   * not return an item which is about to be destroyed.
+   * @returns {TODO} TODO
+   */
+  last() {
+    for (let i = this.items.length - 1; i >= 0; i--) {
+      if (!this.items[i].shouldDestroy) {
+        return this.items[i];
+      }
+    }
+    return null;
+  }
+
   /**
    * TODO
    * @param {TODO} item  TODO