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AngularJS - Filters
  • 时间：2025-02-11

AngularJS - Filters

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Filters are used to modify the data. They can be clubbed in expression or directives using pipe (|) character. The following pst shows the commonly used filters.

Sr.No. Name & Description
1

uppercase

converts a text to upper case text.
2

lowercase

converts a text to lower case text.
3

currency

formats text in a currency format.
4

filter

filter the array to a subset of it based on provided criteria.
5

orderby

orders the array based on provided criteria.

Uppercase Filter

Add uppercase filter to an expression using pipe character. Here we ve added uppercase filter to print student name in all capital letters.

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}}

Lowercase Filter

Add lowercase filter to an expression using pipe character. Here we ve added lowercase filter to print student name in all lowercase letters.

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}}

Currency Filter

Add currency filter to an expression returning number using pipe character. Here we ve added currency filter to print fees using currency format.

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

Filter

To display only required subjects, we use subjectName as filter.

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

OrderBy Filter

To order subjects by marks, we use orderBy marks.

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

Example

The following example shows use of all the above mentioned filters.

testAngularJS.htm

<html>
   <head>
      <title>Angular JS Filters</title>
      <script src = "https://ajax.googleapis.com/ajax/pbs/angularjs/1.3.14/angular.min.js">
      </script>
   </head>
   
   <body>
      <h2>AngularJS Sample Apppcation</h2>
      
      <span 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>
                     <p ng-repeat = "subject in student.subjects | filter: subjectName |orderBy: marks ">
                        {{ subject.name +  , marks:  + subject.marks }}
                     </p>
                  </ul>
               </td>
            </tr>
         </table>
      </span>
      
      <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>

Output

Open the file testAngularJS.htm in a web browser. See the result.