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.
S.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 Upper 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> </head> <body> <h2>AngularJS Sample Application</h2> <div ng-app="" 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> function studentController($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> <script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.2.15/angular.min.js"></script> </body> </html>
Output
Open the file testAngularJS.htm in a web browser. See the result.
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