脚本宝典收集整理的这篇文章主要介绍了javascript代码实例教程-AngularJS学习--- AngularJS中数据双向绑定(two-way data-binding) orderBy step4，脚本宝典觉得挺不错的，现在分享给大家，也给大家做个参考。小宝典致力于为广大程序猿（媛）提供高品质的代码服务，请大家多多光顾小站，小宝典在此谢过。 1.切换工作目录
gIT checkout step-4 #切换分支,切换到第4步
npm start #启动项目
2.代码
app/index.htML
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SeArch: <input ng-model="query">
Sort by:
<select ng-model="orderProp">
<option value="name">Alphabetical</option>
<option value="age">Newest</option>
</select>
<ul class="phones">
<li ng-rePEat="phone in phones | filter:query | orderBy:orderPRop">
{{phone.name}}
<p>{{phone.snippet}}</p>
</li>
</ul>
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app/controllers.js
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VAR phonecatApp = Angular.module('phonecatApp', []);
phonecatApp.controller('PhoneListCtrl', function($scope) {
$scope.phones = [
{'name': 'Nexus S',
'snippet': 'Fast just got faster with Nexus S.',
'age': 1},
{'name': ';motorola XOOM™ with Wi-Fi',
'snippet': 'The Next, Next Generation tablet.',
'age': 2},
{'name': 'MOTOROLA XOOM™',
'snippet': 'The Next, Next Generation tablet.',
'age': 3}
];
$scope.orderProp = 'age';
});
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3.效果
按字母排序:
按时间排序:
很明显,相较于step-3,step-4新增加了排序功能
4.原理说明
首先,添加了<select> 标签:
<select ng-model="orderProp">
<option value="name">Alphabetical</option>
<option value="age">Newest</option>
</select>
其次,在filter中添加了orderBy:
<li ng-repeat="phone in phones | filter:query | orderBy:orderProp">
{{phone.name}}
<p>{{phone.snippet}}</p>
</li>
所以,根据angularjs的思想,一是model改变(可能是用户手动选择下拉框导致的),那么根据数据绑定原则(data-binding),view也将适时进行改变.
orderBy api:https://docs.angularjs.org/api/ng/filter/orderBy
orderBy usage(用法)
In HTML Template Binding(在HTML中的用法)
{{ orderBy_exPression | orderBy : expression : reverse}}
In JavaScript(在JS中的用法)
$filter('orderBy')(array, expression, reverse)
上面的例子是在HTML中用的,默认string类型的数据是按照字母表中数据排序的,而number数字类型的数据是按照数字大小进行排序的.
如果想要倒序,那么可以在上面的option value='-name',加上一个'-'即可.
5.测试
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amosli@amosli-pc:~/develop/angular-phonecat$ npm run protractor
> angular-phonecat@0.0.0 preprotractor /home/amosli/develop/angular-phonecat
> npm run update-webdriver
> angular-phonecat@0.0.0 preupdate-webdriver /home/amosli/develop/angular-phonecat
> npm install
> angular-phonecat@0.0.0 postinstall /home/amosli/develop/angular-phonecat
> bower install
> angular-phonecat@0.0.0 update-webdriver /home/amosli/develop/angular-phonecat
> webdriver-manager update
selenium standalone is up to date.
chromedriver is up to date.
> angular-phonecat@0.0.0 protractor /home/amosli/develop/angular-phonecat
> protractor test/protractor-conf.js
------------------------------------
PID: 5265 (capability: chrome #1)
------------------------------------
Using ChromeDriver directly...
..
Finished in 5.033 seconds
2 tests, 5 assertions, 0 failures
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这里执行的是端到端的测试,测试代码如下:
angular-phonecat/test/e2e/scenarios.js
amosli@amosli-pc:~/develop/angular-phonecat/test/e2e$ cat scenarios.js
'use strict';
/* https://docs.angularjs.org/guide/dev_guide.e2e-testing */
describe('PhoneCat App', function() {
describe('Phone list view', function() {
beforeeach(function() {
browser.get('app/index.html');
});
it('should filter the phone list as user types into the search box', function() {
var phoneList = element.all(by.repeater('phone in phones'));
var query = element(by.model('query'));
expect(phoneList.count()).toBe(3);
query.sendKeys('nexus');
expect(phoneList.count()).toBe(1);
query.clear();
query.sendKeys('motorola');
expect(phoneList.count()).toBe(2);
});
it('should be possible to control phone order via the drop down select box', function() {
var phoneNameColumn = element.all(by.repeater('phone in phones').column('{{phone.name}}'));
var query = element(by.model('query'));
function getnames() {
return phoneNameColumn.map(function(elm) {
return elm.getText();
});
}
query.sendKeys('tablet'); //let's narrow the dataset to make the test assertions shorter
expect(getNames()).toEqual([
"Motorola XOOM/u2122 with Wi-Fi",
"MOTOROLA XOOM/u2122"
]);
element(by.model('orderProp')).findElement(by.css('option[value="name"]')).click();
expect(getNames()).toEqual([
"MOTOROLA XOOM/u2122",
"Motorola XOOM/u2122 with Wi-Fi"
]);
});
});
});
觉得可用，就经常来吧！ 脚本宝典 欢迎评论哦！ js脚本，巧夺天工，精雕玉琢。小宝典献丑了！
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