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Filters are used to modify the data. They can be clubbed in expression or directives using pipe (|) character. The following list 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>
<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 shows use of 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 the file testAngularJS.htm in a web browser. See the result.
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