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-@ngdoc overview
-@name Tutorial: 4 - Two-way Data Binding
-@description
-
-<ul doc:tutorial-nav="4"></ul>
-
-
-In this step, you will add a feature to let your users control the order of the items in the phone
-list. The dynamic ordering is implemented by creating a new model property, wiring it together with
-the repeater, and letting the data binding magic do the rest of the work.
-
-
-<doc:tutorial-instructions step="4"></doc:tutorial-instructions>
-
-
-You should see that in addition to the search box, the app displays a drop down menu that allows
-users to control the order in which the phones are listed.
-
-The most important differences between Steps 3 and 4 are listed below. You can see the full diff on
-{@link https://github.com/angular/angular-phonecat/compare/step-3...step-4 GitHub}:
-
-
-## Template
-
-__`app/index.html`:__
-<pre>
-...
-  <ul class="controls">
-    <li>
-      Search: <input type="text" ng:model="query"/>
-    </li>
-    <li>
-      Sort by:
-      <select ng:model="orderProp">
-        <option value="name">Alphabetical</option>
-        <option value="age">Newest</option>
-      </select>
-    </li>
-  </ul>
-
-  <ul class="phones">
-    <li ng:repeat="phone in phones.$filter(query).$orderBy(orderProp)">
-      {{phone.name}}
-      <p>{{phone.snippet}}</p>
-    </li>
-  </ul>
-...
-</pre>
-
-We made the following changes to the `index.html` template:
-
-* First, we added a `<select>` html element named `orderProp`, so that our users can pick from the
-two provided sorting options.
-
-      <img src="img/tutorial/tutorial_04-06_final.png">
-
-* We then chained the `$filter` method with {@link api/angular.module.ng.$filter.orderBy `$orderBy`} method to
-further process the input into the repeater. `$orderBy` is a utility method similar to {@link
-api/angular.module.ng.$filter.filter `$filter`}, but instead of filtering an array, it reorders it.
-
-Angular creates a two way data-binding between the select element and the `orderProp` model.
-`orderProp` is then used as the input for the `$orderBy` method.
-
-As we discussed in the section about data-binding and the repeater in step 3, whenever the model
-changes (for example because a user changes the order with the select drop down menu), Angular's
-data-binding will cause the view to automatically update. No bloated DOM manipulation code is
-necessary!
-
-
-
-## Controller
-
-__`app/js/controller.js`:__
-<pre>
-/* App Controllers */
-
-function PhoneListCtrl() {
-  this.phones = [{"name": "Nexus S",
-                  "snippet": "Fast just got faster with Nexus S.",
-                  "age": 0},
-                 {"name": "Motorola XOOM™ with Wi-Fi",
-                  "snippet": "The Next, Next Generation tablet.",
-                  "age": 1},
-                 {"name": "MOTOROLA XOOM™",
-                  "snippet": "The Next, Next Generation tablet.",
-                  "age": 2}];
-
-  this.orderProp = 'age';
-}
-</pre>
-
-* We modified the `phones` model - the array of phones - and added an `age` property to each phone
-record. This property is used to order phones by age.
-
-* We added a line to the controller that sets the default value of `orderProp` to `age`. If we had
-not set the default value here, angular would have used the value of the first `<option>` element
-(`'name'`) when it initialized the data model.
-
-  This is a good time to talk about two-way data-binding. Notice that when the app is loaded in the
-browser, "Newest" is selected in the drop down menu. This is because we set `orderProp` to `'age'`
-in the controller. So the binding works in the direction from our model to the UI. Now if you
-select "Alphabetically" in the drop down menu, the model will be updated as well and the phones
-will be reordered. That is the data-binding doing its job in the opposite direction — from the UI
-to the model.
-
-
-
-## Test
-
-The changes we made should be verified with both a unit test and an end-to-end test. Let's look at
-the unit test first.
-
-__`test/unit/controllerSpec.js`:__
-<pre>
-describe('PhoneCat controllers', function() {
-
-  describe('PhoneListCtrl', function() {
-    var scope, $browser, ctrl;
-
-    beforeEach(function() {
-      ctrl = new PhoneListCtrl();
-    });
-
-
-    it('should create "phones" model with 3 phones', function() {
-      expect(ctrl.phones.length).toBe(3);
-    });
-
-
-    it('should set the default value of orderProp model', function() {
-      expect(ctrl.orderProp).toBe('age');
-    });
-  });
-});
-</pre>
-
-
-The unit test now verifies that the default ordering property is set.
-
-We used Jasmine's API to extract the controller construction into a `beforeEach` block, which is
-shared by all tests in the parent `describe` block.
-
-To run the unit tests, once again execute the `./scripts/test.sh` script and you should see the
-following output.
-
-        Chrome: Runner reset.
-        ..
-        Total 2 tests (Passed: 2; Fails: 0; Errors: 0) (3.00 ms)
-          Chrome 11.0.696.57 Mac OS: Run 2 tests (Passed: 2; Fails: 0; Errors 0) (3.00 ms)
-
-
-Let's turn our attention to the end-to-end test.
-
-__`test/e2e/scenarios.js`:__
-<pre>
-...
-    it('should be possible to control phone order via the drop down select box',
-        function() {
-
-      // narrow the dataset to make the test assertions shorter
-      input('query').enter('tablet');
-
-      expect(repeater('.phones li', 'Phone List').column('a')).
-          toEqual(["Motorola XOOM\u2122 with Wi-Fi",
-                   "MOTOROLA XOOM\u2122"]);
-
-      select('orderProp').option('alphabetical');
-
-      expect(repeater('.phones li', 'Phone List').column('a')).
-          toEqual(["MOTOROLA XOOM\u2122",
-                   "Motorola XOOM\u2122 with Wi-Fi"]);
-    });
-...
-</pre>
-
-The end-to-end test verifies that the ordering mechanism of the select box is working correctly.
-
-You can now refresh the browser tab with the end-to-end test runner to see the tests run, or you
-can see them running on {@link
-http://angular.github.com/angular-phonecat/step-4/test/e2e/runner.html
-Angular's server}.
-
-# Experiments
-
-* In the `PhoneListCtrl` controller, remove the statement that sets the `orderProp` value and
-you'll see that the ordering as well as the current selection in the dropdown menu will default to
-"Alphabetical".
-
-* Add an `{{orderProp}}` binding into the `index.html` template to display its current value as
-text.
-
-# Summary
-
-Now that you have added list sorting and tested the app, go to {@link step_05 step 5} to learn
-about Angular services and how Angular uses dependency injection.
-
-
-<ul doc:tutorial-nav="4"></ul>