<h1 id="Cookbook..Deep.Linking">Cookbook: Deep Linking</h1>
<div class="cookbook--deep-linking"><p>Deep linking allows you to encode the state of the application in the URL so that it can be
bookmarked and the application can be restored from the URL to the same state.</p>

<p>While angular does not force you to deal with bookmarks in any particular way, it has services
which make the common case described here very easy to implement.</p>

<h2>Assumptions</h2>

<p>Your application consists of a single HTML page which bootstraps the application. We will refer
to this page as the chrome.
Your application is divided into several screens (or views) which the user can visit. For example,
the home screen, settings screen, details screen, etc. For each of these screens, we would like to
assign a URL so that it can be bookmarked and later restored. Each of these screens will be
associated with a controller which define the screen's behavior. The most common case is that the
screen will be constructed from an HTML snippet, which we will refer to as the partial. Screens can
have multiple partials, but a single partial is the most common construct. This example makes the
partial boundary visible using a blue line.</p>

<p>You can make a routing table which shows which URL maps to which partial view template and which
controller.</p>

<h2>Example</h2>

<p>In this example we have a simple app which consist of two screens:</p>

<ul>
<li>Welcome: url <code>welcome</code> Show the user contact information.</li>
<li>Settings: url <code>settings</code> Show an edit screen for user contact information.</li>
</ul>

<h2>Demo Source Code</h2>
<div source-edit="deepLinking" source-edit-deps="angular.js angular-sanitize.js script.js" source-edit-html="index.html-4 settings.html welcome.html" source-edit-css="style.css" source-edit-js="script.js-3" source-edit-unit="" source-edit-scenario="scenario.js-5"></div>
<div class="tabbable"><div class="tab-pane" title="index.html">
<pre class="prettyprint linenums" ng-set-text="index.html-4" ng-html-wrap="deepLinking angular.js angular-sanitize.js script.js"></pre>
<script type="text/ng-template" id="index.html-4">
    <div ng-controller="AppCntl">
      <h2>Your App Chrome</h2>
      [ <a href="welcome">Welcome</a> | <a href="settings">Settings</a> ]
      <hr/>
      <span class="partial-info">
        Partial: {{$route.current.template}}
      </span>
      <div ng-view></div>
      <small>Your app footer </small>
    </div>
 </script>
</div>
<div class="tab-pane" title="settings.html">
<pre class="prettyprint linenums" ng-set-text="settings.html"></pre>
<script type="text/ng-template" id="settings.html">
   <label>Name:</label>
   <input type="text" ng:model="form.name" required>

   <div ng:repeat="contact in form.contacts">
     <select ng:model="contact.type">
       <option>url</option>
       <option>email</option>
       <option>phone</option>
     </select>
     <input type="text" ng:model="contact.url">
     [ <a href="" ng:click="form.contacts.$remove(contact)">X</a> ]
   </div>
   <div>
     [ <a href="" ng:click="form.contacts.$add()">add</a> ]
   </div>

   <button ng:click="cancel()">Cancel</button>
   <button ng:click="save()">Save</button>
 </script>
</div>
<div class="tab-pane" title="welcome.html">
<pre class="prettyprint linenums" ng-set-text="welcome.html"></pre>
<script type="text/ng-template" id="welcome.html">
   Hello {{person.name}},
   <div>
     Your contact information:
     <div ng:repeat="contact in person.contacts">{{contact.type}}:
       <span ng-bind-html="contact.url|linky"></span>
     </div>
   </div>
 </script>
</div>
<div class="tab-pane" title="style.css">
<pre class="prettyprint linenums" ng-set-text="style.css"></pre>
<style type="text/css" id="style.css">
   [ng-view] {
     border: 1px solid blue;
     margin: 0;
     padding:1em;
   }

   .partial-info {
      background-color: blue;
      color: white;
      padding: 3px;
    }
 </style>
</div>
<div class="tab-pane" title="script.js">
<pre class="prettyprint linenums" ng-set-text="script.js-3"></pre>
<script type="text/ng-template" id="script.js-3">
   angular.module('deepLinking', ['ngSanitize'])
     .config(function($routeProvider) {
        $routeProvider.
          when("/welcome",  {template:'welcome.html',  controller:WelcomeCntl}).
          when("/settings", {template:'settings.html', controller:SettingsCntl});
     });

   AppCntl.$inject = ['$scope', '$route']
   function AppCntl($scope, $route) {
    $scope.$route = $route;

    // initialize the model to something useful
    $scope.person = {
     name:'anonymous',
     contacts:[{type:'email', url:'anonymous@example.com'}]
    };
   }

   function WelcomeCntl($scope) {
    $scope.greet = function() {
     alert("Hello " + $scope.person.name);
    };
   }

   function SettingsCntl($scope, $location) {
    $scope.cancel = function() {
     $scope.form = angular.copy($scope.person);
    };

    $scope.save = function() {
     angular.copy($scope.form, $scope.person);
     $location.path('/welcome');
    };

    $scope.cancel();
   }
 </script>
</div>
<div class="tab-pane" title="End to end test">
<pre class="prettyprint linenums" ng-set-text="scenario.js-5"></pre>
<script type="text/ng-template" id="scenario.js-5">
   it('should navigate to URL', function() {
     element('a:contains(Welcome)').click();
     expect(element('[ng-view]').text()).toMatch(/Hello anonymous/);
     element('a:contains(Settings)').click();
     input('form.name').enter('yourname');
     element(':button:contains(Save)').click();
     element('a:contains(Welcome)').click();
     expect(element('[ng-view]').text()).toMatch(/Hello yourname/);
   });
 </script>
</div>
</div><h2>Demo Source Code</h2>
<div class="well  doc-example-live" ng-embed-app="deepLinking" ng-set-html="index.html-4" ng-eval-javascript="script.js-3"></div>

<h2>Things to notice</h2>

<ul>
<li>Routes are defined in the <code>AppCntl</code> class. The initialization of the controller causes the
initialization of the <a href="api/angular.module.ng.$route"><code>$route</code></a> service with the proper URL
routes.</li>
<li>The  <a href="api/angular.module.ng.$route"><code>$route</code></a> service then watches the URL and instantiates the
appropriate controller when the URL changes.</li>
<li>The  <a href="api/angular.module.ng.$compileProvider.directive.ngView"><code>ngView</code></a> widget loads the
view when the URL changes. It also sets the view scope to the newly instantiated controller.</li>
<li>Changing the URL is sufficient to change the controller and view. It makes no difference whether
the URL is changed programatically or by the user.</li>
</ul></div>
