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Sunday, February 12, 2017

AngularJS - Filters

Filters are used to change modify the data and can be clubbed in expression or directives using pipe character. Following is the list of 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 filter

To display only required subjects, we've used subjectName as filter.
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>

orderby filter

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

Example

Following example will showcase all the above mentioned filters.
testAngularJS.htm
<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>

Output

Open textAngularJS.htm in a web browser. See the result.
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