AngularJS學習--- 事件處理(Event Handlers) ng-click操作 step 10

本文主要通過介紹ng-click方法來對angularjs中的事件處理方法做個了解.

1.切換目錄

git checkout step-10
npm start

 

2.效果

點擊右邊的小圖片,那么左邊框中將顯示大圖片,示例如下:

 

3.代碼實現

查看step-9和step-10之間的代碼差異: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:控制器這里定義了一個setImage方法,就是將mainImageUrl的值設置為當前imageUrl.

 

 CSS(樣式)

app/css/app.css

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

改變鼠標移動上去的樣式為指針形.

 

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>
...

 

 這里定義了一個ng-click方法,這里將當前的img作為參數傳過去,然后,setImage方法將mainImageUrl的值替換為當前點擊的圖片,從而實現點擊小圖片,左邊的圖片被放大.

4.測試:

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/);
    });
  });

執行如下命令進行測試:

npm run protractor

#測試結果如下:
------------------------------------
PID: 4250 (capability: chrome #1)
------------------------------------

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

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

 

5.實驗:

在Controllers中的PhoneDetailCtrl加入:

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

同時在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>
...

效果如下圖所示:

 

 

這樣就完成了一個ng-click的操作.

 

 事件處理方法,除了ng-click還有其它如:

ngMousemove 

ngMouseleave

ngMouseover 

ngKeyup

ngSubmit

 ....

 可以根據個人需要進行選擇,和JS本身自帶的方法差不多,這里只不過angularjs又多封裝了一層.