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| author | Igor Minar | 2011-05-02 10:16:50 -0700 | 
|---|---|---|
| committer | Igor Minar | 2011-06-06 22:28:38 -0700 | 
| commit | 6181ca600d3deced0a054551ff6c704bc17d6b7d (patch) | |
| tree | bd67f96eea18164c751a08c74d6124cddcc9d890 /docs/content/tutorial/step_04.ngdoc | |
| parent | 11e9572b952e49b01035e956c412d6095533031a (diff) | |
| download | angular.js-6181ca600d3deced0a054551ff6c704bc17d6b7d.tar.bz2 | |
new batch of tutorial docs
Diffstat (limited to 'docs/content/tutorial/step_04.ngdoc')
| -rwxr-xr-x | docs/content/tutorial/step_04.ngdoc | 362 | 
1 files changed, 201 insertions, 161 deletions
| diff --git a/docs/content/tutorial/step_04.ngdoc b/docs/content/tutorial/step_04.ngdoc index 0589ba75..c1fd00bb 100755 --- a/docs/content/tutorial/step_04.ngdoc +++ b/docs/content/tutorial/step_04.ngdoc @@ -1,161 +1,201 @@ -@workInProgress
 -@ngdoc overview
 -@name Tutorial: Step 4
 -@description
 -<table id="tutorial_nav">
 -<tr>
 -<td id="previous_step">{@link tutorial.step_03 Previous}</td>
 -<td id="step_result">{@link  http://angular.github.com/angular-phonecat/step-4/app Example}</td>
 -<td id="tut_home">{@link tutorial Tutorial Home}</td>
 -<td id="code_diff">{@link https://github.com/angular/angular-phonecat/compare/step-3...step-4 Code
 -Diff}</td>
 -<td id="next_step">{@link tutorial.step_05 Next}</td>
 -</tr>
 -</table>
 -
 -In this step, we add a feature that lets our users choose which way to order the phone list.
 -
 -__`app/index.html`:__
 -<pre>
 -...
 -  <ul class="predicates">
 -    <li>
 -      Search: <input type="text" name="query"/>
 -    </li>
 -    <li>
 -      Sort by:
 -      <select name="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>
 -
 -__`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>
 -
 -__`test/unit/controllerSpec.js`:__
 -<pre>
 -/* jasmine specs for controllers go here */
 -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>
 -
 -__`test/e2e/scenarios.js`:__
 -<pre>
 -/* jasmine-like end2end tests go here */
 -describe('PhoneCat App', function() {
 -
 -  describe('Phone list view', function() {
 -
 -    beforeEach(function() {
 -      browser().navigateTo('../../app/index.html');
 -    });
 -
 -
 -    it('should filter the phone list as user types into the search box', function() {
 -      expect(repeater('.phones li').count()).toBe(3);
 -
 -      input('query').enter('nexus');
 -      expect(repeater('.phones li').count()).toBe(1);
 -
 -      input('query').enter('motorola');
 -      expect(repeater('.phones li').count()).toBe(2);
 -    });
 -
 -
 -    it('should be possible to control phone order via the drop down select box', function() {
 -      input('query').enter('tablet'); //let's narrow the dataset to make the test assertions
 -      shorter
 -
 -      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>
 -
 -## Discussion:
 -
 -To provide dynamic ordering, we employ another one of angular's "array type augmenters" and let
 -the data binding do the rest of the work for us:
 -
 -* First, we provide a `<select>` element named `orderProp` for our users so they can choose to
 -sort the phone list either alphabetically or by the age of the phone.  We added the `age` property
 -to each phone record so we can sort by that field.
 -
 -* Like {@link angular.Array.filter $filter}, {@link angular.Array.orderBy $orderBy} is a built-in
 -method available on array objects in angular expressions.  In our UI template, we set up a select
 -box that lets the user set the `orderProp` model variable to one of the string constants: `age` or
 -`name`.
 -
 -* In our controller, we added a line to set the default value of `orderProp` to `age`.  If we
 -don't override the default value, angular uses the value of the first `<option>` element when it
 -initializes the data model.
 -
 -* Our unit test now verifies that our default ordering property is set.
 -
 -* We added an end-to-end test to verify that our select box ordering mechanism works properly.
 -
 -* Once again we added a little more CSS to improve the View.
 -
 -<table id="tutorial_nav">
 -<tr>
 -<td id="previous_step">{@link tutorial.step_03 Previous}</td>
 -<td id="step_result">{@link  http://angular.github.com/angular-phonecat/step-4/app Example}</td>
 -<td id="tut_home">{@link tutorial Tutorial Home}</td>
 -<td id="code_diff">{@link https://github.com/angular/angular-phonecat/compare/step-3...step-4 Code
 -Diff}</td>
 -<td id="next_step">{@link tutorial.step_05 Next}</td>
 -</tr>
 -</table>
 +@ngdoc overview +@name Tutorial: Step 4 +@description +<table id="tutorial_nav"> +<tr> +<td id="previous_step">{@link tutorial.step_03 Previous}</td> +<td id="step_result">{@link  http://angular.github.com/angular-phonecat/step-4/app Live Demo}</td> +<td id="tut_home">{@link tutorial Tutorial Home}</td> +<td id="code_diff">{@link https://github.com/angular/angular-phonecat/compare/step-3...step-4 Code +Diff}</td> +<td id="next_step">{@link tutorial.step_05 Next}</td> +</tr> +</table> + +In this step, you will add a feature to let your users select 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. + + +1. Reset your workspace to Step 4 using: + +    git checkout --force step-4 + +or + +    ./goto_step.sh 4 + +2. Refresh your browser or check the app out on {@link +http://angular.github.com/angular-phonecat/step-4/app our server}. 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 changes 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="predicates"> +    <li> +      Search: <input type="text" name="query"/> +    </li> +    <li> +      Sort by: +      <select name="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).$orderBy(orderProp)"> +      {{phone.name}} +      <p>{{phone.snippet}}</p> +    </li> +  </ul> +... +</pre> + +In the `index.html` template we made the following changes: + +* First, we added a `<select>` html element named `orderProp`, so that our users can pick from the +two provided sorting options. + +* We then chained the `$filter` method with `{@link angular.Array.orderBy $orderBy}` method to +further process the input into the repeater. + +Angular creates a two way data-binding between the select element and the `orderProp` model. +`orderProp` is then used as the input for the `$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. + + + + +## 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> +/* jasmine specs for controllers go here */ +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 nearest `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() { +      input('query').enter('tablet'); //let's narrow the dataset to make the test assertions +      shorter + +      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}. + +Now that you have added list sorting and tested the app, go to Step 5 to learn about angular +services and how angular uses dependency injection. + + +<table id="tutorial_nav"> +<tr> +<td id="previous_step">{@link tutorial.step_03 Previous}</td> +<td id="step_result">{@link  http://angular.github.com/angular-phonecat/step-4/app Live Demo}</td> +<td id="tut_home">{@link tutorial Tutorial Home}</td> +<td id="code_diff">{@link https://github.com/angular/angular-phonecat/compare/step-3...step-4 Code +Diff}</td> +<td id="next_step">{@link tutorial.step_05 Next}</td> +</tr> +</table> | 
