AngularJS学习--- 事件处理(Event Handlers) ng-click操作 step 10

本文主要通过介绍ng-click方法来对angularjs中的事件处理方法做个了解.

1.切换目录

git checkout step-10
npm start

2.效果

点击右边的小图片,那么左边框中将显示大图片,示例如下:

3.代码实现

查看step-9和step-10之间的代码差异:https://github.com/angular/angular-phonecat/compare/step-9...step-10

 Controllers(控制器)

app/js/controllers.js:

'use strict';

/* Controllers */

var phonecatControllers = angular.module('phonecatControllers', []);

phonecatControllers.controller('PhoneListCtrl', ['$scope', '$http',
  function($scope, $http) {
    $http.get('phones/phones.json').success(function(data) {
      $scope.phones = data;
    });

    $scope.orderProp = 'age';
  }]);

phonecatControllers.controller('PhoneDetailCtrl', ['$scope', '$routeParams', '$http',
  function($scope, $routeParams, $http) {
    $http.get('phones/' + $routeParams.phoneId + '.json').success(function(data) {
      $scope.phone = data;
      $scope.mainImageUrl = data.images[0];
    });

    $scope.setImage = function(imageUrl) {
      $scope.mainImageUrl = imageUrl;
    }
  }]);

 注:控制器这里定义了一个setImage方法,就是将mainImageUrl的值设置为当前imageUrl.

 CSS(样式)

app/css/app.css

ul.phone-thumbs img:hover {
   cursor: pointer;
 }

改变鼠标移动上去的样式为指针形.

Template(模板)

app/partials/phone-detail.html

<img ng-src="{{mainImageUrl}}" class="phone">

...

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

 这里定义了一个ng-click方法,这里将当前的img作为参数传过去,然后,setImage方法将mainImageUrl的值替换为当前点击的图片,从而实现点击小图片,左边的图片被放大.

4.测试:

test/e2e/scenarios.js

...
  describe('Phone detail view', function() {

...

    it('should display the first phone image as the main phone image', function() {
      expect(element(by.css('img.phone')).getAttribute('src')).toMatch(/img/phones/nexus-s.0.jpg/);
    });


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

      element(by.css('.phone-thumbs li:nth-child(1) img')).click();
      expect(element(by.css('img.phone')).getAttribute('src')).toMatch(/img/phones/nexus-s.0.jpg/);
    });
  });

执行如下命令进行测试:

npm run protractor

#测试结果如下:
------------------------------------
PID: 4250 (capability: chrome #1)
------------------------------------

Using ChromeDriver directly...
.......

Finished in 9.867 seconds
7 tests, 11 assertions, 0 failures

5.实验:

在Controllers中的PhoneDetailCtrl加入:

$scope.hello = function(name) {
        alert('Hello ' + (name || 'world') + '!');
    }

同时在phone-detail.html中加入:

<h1>{{phone.name}}</h1>
 <button id="{{phone.name}}" ng-click="hello(phone.name)">Hello</button>
<p>{{phone.description}}</p>
...

效果如下图所示:

这样就完成了一个ng-click的操作.

 事件处理方法,除了ng-click还有其它如:

ngMousemove 

ngMouseleave

ngMouseover 

ngKeyup

ngSubmit

 ....

 可以根据个人需要进行选择,和JS本身自带的方法差不多,这里只不过angularjs又多封装了一层.