Hello folks! welcome back to a new edition of our tutorial on AngularJS. In this tutorial, we're going to be studying about AngularJS Filters.
Filters are used to modify a data. They can be grouped in expression or directives using pipe (|) character. Following table is a list of the commonly used filters -
Filters are used to modify a data. They can be grouped in expression or directives using pipe (|) character. Following table is a list of 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 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}}
READ: AngularJS | Controllers
Currency Filter
Include currency filter to an expression that return a number via pipe character. Here we have 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 make use of 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 use orderBy marks.
Subject: <ul> <li ng-repeat = "subject in student.subjects | orderBy:'marks'"> {{ subject.name + ', marks:' + subject.marks }} </li> </ul>
Example
The following example below illustrates the use of all the above mentioned filters.
Create a file testAngularJS.html.
Create a file testAngularJS.html.
<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: "Kennedy", lastName: "Nkpara", fees:1000, 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.html in any web browser and see the result -
AngularJS Sample Application
| Enter first name: | |
| Enter last name: | |
| Enter fees: | |
| Enter subject: |
| Name in Upper Case: | KENNEDY NKPARA |
| Name in Lower Case: | kennedy nkpara |
| fees: | $1000.00 |
| Subject: |
|
READ: AngularJS | Directives
Alright guys! This is where we are going to be rounding up for this tutorial. In our next tutorial, we are going to be studying about AngularJS Tables.
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Thanks for reading and bye for now.