add utils angular module and navigation check factory

app/assets/javascripts/admin/all.js

@@ -22,6 +22,7 @@
 //= require ./payment_methods/payment_methods
 //= require ./products/products
 //= require ./shipping_methods/shipping_methods
+//= require ./utils/utils
 //= require ./users/users
 //= require textAngular.min.js
 //= require textAngular-sanitize.min.js

app/assets/javascripts/admin/enterprises/controllers/enterprise_controller.js.coffee

@@ -1,11 +1,15 @@
 angular.module("admin.enterprises")
-  .controller "enterpriseCtrl", ($scope, Enterprise, longDescription, PaymentMethods, ShippingMethods) ->
+  .controller "enterpriseCtrl", ($scope, longDescription, Enterprise, PaymentMethods, ShippingMethods, NavigationCheck) ->
     $scope.Enterprise = Enterprise.enterprise
     $scope.PaymentMethods = PaymentMethods.paymentMethods
     $scope.ShippingMethods = ShippingMethods.shippingMethods
+    # htmlVariable is used by textAngular wysiwyg for the long descrtiption.
     $scope.htmlVariable = longDescription
-    $scope.$on "$routeChangeStart", (event, newUrl, oldUrl) ->
-      event.preventDefault()
+    # Provide a callback for a warning message displayed when leaving the page.
+    navigationCallback = ->
+      "You are editing an enterprise!"
+
+    NavigationCheck.register navigationCallback
 
     for payment_method in $scope.PaymentMethods
       payment_method.selected = payment_method.id in $scope.Enterprise.payment_method_ids

app/assets/javascripts/admin/enterprises/enterprises.js.coffee

@@ -1 +1 @@
-angular.module("admin.enterprises", ["admin.payment_methods", "admin.shipping_methods", "admin.users", "textAngular"])
+angular.module("admin.enterprises", ["admin.payment_methods", "admin.utils", "admin.shipping_methods", "admin.users", "textAngular"])

app/assets/javascripts/admin/utils/services/navigation_check.js.coffee

@@ -0,0 +1,37 @@
+angular.module("admin.utils")
+  .factory "NavigationCheck", ($window, $rootScope) ->
+    callbacks = []
+
+    # Action for regular browser navigation.
+    onBeforeUnloadHandler = ($event) ->
+      message = getMessage()
+      if message
+        ($event or $window.event).preventDefault()
+        message
+
+    # Action for angular navigation.
+    locationChangeStartHandler = ($event) ->
+      message = getMessage()
+      if message and not $window.confirm(message)
+        $event.stopPropagation() if $event.stopPropagation
+        $event.preventDefault() if $event.preventDefault
+        $event.cancelBubble = true
+        $event.returnValue = false
+
+    # Runs callback functions to retreive most recently added non-empty message.
+    getMessage = ->
+      message = null
+      message = callback() ? message for callback in callbacks
+      message
+
+    register = (callback) ->
+      callbacks.push callback
+
+    if $window.addEventListener
+      $window.addEventListener "beforeunload", onBeforeUnloadHandler
+    else
+      $window.onbeforeunload = onBeforeUnloadHandler
+
+    $rootScope.$on "$locationChangeStart", locationChangeStartHandler
+
+    return register: register

app/assets/javascripts/admin/utils/utils.js.coffee

@@ -0,0 +1 @@
+angular.module("admin.utils", [])