AngularJS - 過濾器

過濾器用於修改資料。它們可以透過管道符（|）字元組合在表示式或指令中。以下列表顯示了常用的過濾器。

序號	名稱及描述
1	uppercase 將文字轉換為大寫文字。
2	lowercase 將文字轉換為小寫文字。
3	currency 將文字格式化為貨幣格式。
4	filter 根據提供的條件過濾陣列到其子集。
5	orderby 根據提供的條件對陣列進行排序。

大寫過濾器

使用管道字元將大寫過濾器新增到表示式中。這裡我們添加了大寫過濾器以全部大寫字母列印學生姓名。

Enter first name:<input type = "text" ng-model = "student.firstName">
Enter last name: <input type = "text" ng-model = "student.lastName">
Name in Upper Case: {{student.fullName() | uppercase}}

小寫過濾器

使用管道字元將小寫過濾器新增到表示式中。這裡我們添加了小寫過濾器以全部小寫字母列印學生姓名。

Enter first name:<input type = "text" ng-model = "student.firstName">
Enter last name: <input type = "text" ng-model = "student.lastName">
Name in Lower Case: {{student.fullName() | lowercase}}

貨幣過濾器

使用管道字元將貨幣過濾器新增到返回數字的表示式中。這裡我們添加了貨幣過濾器以使用貨幣格式列印費用。

Enter fees: <input type = "text" ng-model = "student.fees">
fees: {{student.fees | currency}}

過濾器

要僅顯示所需的科目，我們使用 subjectName 作為過濾器。

Enter subject: <input type = "text" ng-model = "subjectName">
Subject:
<ul>
   <li ng-repeat = "subject in student.subjects | filter: subjectName">
      {{ subject.name + ', marks:' + subject.marks }}
   </li>
</ul>

排序過濾器

要按分數對科目進行排序，我們使用 orderBy 分數。

Subject:
<ul>
   <li ng-repeat = "subject in student.subjects | orderBy:'marks'">
      {{ subject.name + ', marks:' + subject.marks }}
   </li>
</ul>

示例

以下示例顯示了所有上述提到的過濾器的用法。

testAngularJS.htm

線上演示

<html>
   <head>
      <title>Angular JS Filters</title>
      <script src = "https://ajax.googleapis.com/ajax/libs/angularjs/1.3.14/angular.min.js">
      </script>
   </head>
   
   <body>
      <h2>AngularJS Sample Application</h2>
      
      <div ng-app = "mainApp" ng-controller = "studentController">
         <table border = "0">
            <tr>
               <td>Enter first name:</td>
               <td><input type = "text" ng-model = "student.firstName"></td>
            </tr>
            <tr>
               <td>Enter last name: </td>
               <td><input type = "text" ng-model = "student.lastName"></td>
            </tr>
            <tr>
               <td>Enter fees: </td>
               <td><input type = "text" ng-model = "student.fees"></td>
            </tr>
            <tr>
               <td>Enter subject: </td>
               <td><input type = "text" ng-model = "subjectName"></td>
            </tr>
         </table>
         <br/>
         
         <table border = "0">
            <tr>
               <td>Name in Upper Case: </td><td>{{student.fullName() | uppercase}}</td>
            </tr>
            <tr>
               <td>Name in Lower Case: </td><td>{{student.fullName() | lowercase}}</td>
            </tr>
            <tr>
               <td>fees: </td><td>{{student.fees | currency}}
               </td>
            </tr>
            <tr>
               <td>Subject:</td>
               <td>
                  <ul>
                     <li ng-repeat = "subject in student.subjects | filter: subjectName |orderBy:'marks'">
                        {{ subject.name + ', marks:' + subject.marks }}
                     </li>
                  </ul>
               </td>
            </tr>
         </table>
      </div>
      
      <script>
         var mainApp = angular.module("mainApp", []);
         
         mainApp.controller('studentController', function($scope) {
            $scope.student = {
               firstName: "Mahesh",
               lastName: "Parashar",
               fees:500,
               
               subjects:[
                  {name:'Physics',marks:70},
                  {name:'Chemistry',marks:80},
                  {name:'Math',marks:65}
               ],
               fullName: function() {
                  var studentObject;
                  studentObject = $scope.student;
                  return studentObject.firstName + " " + studentObject.lastName;
               }
            };
         });
      </script>
      
   </body>
</html>

輸出

在 Web 瀏覽器中開啟檔案 testAngularJS.htm。檢視結果。

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