@workInProgress
@ngdoc overview
@name Tutorial: Step 10
@description
<table id="tutorial_nav">
<tr>
<td id="previous_step">{@link tutorial.step_9 Previous}</td>
<td id="step_result">{@link  http://angular.github.com/angular-phonecat/step-10/app Example}</td>
<td id="tut_home">{@link tutorial Tutorial Home}</td>
<td id="code_diff">{@link
https://github.com/angular/angular-phonecat/commit/abe1e13c7d9e725fdd3b811ca5ec28ea0d973aab Code
Diff}</td>
<td id="next_step">{@link tutorial.step_11 Next}</td>
</tr>
</table>

In this step we will add a phone image swapping feature. We want to be able to click on a
thumbnail image in the phone details page, and have that action change the large phone image to
match the selection.

__`app/partials/phone-detail.html`.__
<pre>
<img ng:src="{{mainImageUrl}}" class="phone"/>

<h1>{{phone.name}}</h1>

<p>{{phone.description}}</p>

<ul class="phone-thumbs">
  <li ng:repeat="img in phone.images">
    <img ng:src="{{img}}" ng:click="setImage(img)">
  </li>
</ul>
...
</pre>

__`app/js/controllers.js`.__
<pre>
...
function PhoneDetailCtrl($xhr) {
  var self = this;

  $xhr('GET', 'phones/' + self.params.phoneId + '.json', function(code, response) {
    self.phone = response;
    self.mainImageUrl = response.images[0];
  });

  self.setImage = function(imageUrl) {
    self.mainImageUrl = imageUrl;
  }
}

//PhoneDetailCtrl.$inject = ['$xhr'];
</pre>

__`test/e2e/scenarios.js`.__
<pre>
/* jasmine-like end2end tests go here */
...
  describe('Phone detail view', function() {

    beforeEach(function() {
      browser().navigateTo('../../app/index.html#/phones/nexus-s');
    });


    it('should display nexus-s page', function() {
      expect(binding('phone.name')).toBe('Nexus S');
    });

    it('should display "0.large" image as the main phone image', function() {
       expect(element('img.phone').attr('src')).toBe('img/phones/nexus-s.0.jpg');
    });


    it('should swap main image if a thumbnail image is clicked on', function() {
      element('.phone-thumbs li:nth-child(3) img').click();
      expect(element('img.phone').attr('src')).toBe('img/phones/nexus-s.2.jpg');

      element('.phone-thumbs li:nth-child(1) img').click();
      expect(element('img.phone').attr('src')).toBe('img/phones/nexus-s.0.jpg');
    });
  });
});
</pre>

## Discussion:

Adding the phone image swapping feature is fairly straightforward:

- We defined the `mainImageUrl` model variable in the details controller (`PhoneDetailCtrl`) and
set the default value of `mainImageUrl` to the first image in the array of images.
- We created a `setImage` controller method to change `mainImageUrl` to the image clicked on by
the user.
- We registered an `ng:click` handler for thumb images to use the `setImage` controller method.
- And of course, we added e2e tests for our new feature.


<table id="tutorial_nav">
<tr>
<td id="previous_step">{@link tutorial.step_9 Previous}</td>
<td id="step_result">{@link  http://angular.github.com/angular-phonecat/step-10/app Example}</td>
<td id="tut_home">{@link tutorial Tutorial Home}</td>
<td id="code_diff">{@link
https://github.com/angular/angular-phonecat/commit/abe1e13c7d9e725fdd3b811ca5ec28ea0d973aab Code
Diff}</td>
<td id="next_step">{@link tutorial.step_11 Next}</td>
</tr>
</table>