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@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>
|
