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Filters for AngularJS Basic knowledge notes

  • 2020-06-07 04:02:43
  • OfStack

Filters are used to change and modify data and can be placed in expressions or pipe directives. Here is a list of commonly used filters.

S.No. Name description
1 Capital convert text to capital text.
2 Lower case converts text to lower case text.
Currency currency format format text.
Filter the array according to 1 subset of the supplied criteria.
Sort sort provides the standard base array. Uppercase filter

Add an uppercase filter using an expression with a pipe character. Here, a uppercase filter is added to print the student's name in all uppercase 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 filters, using expressions with pipe characters. Add a lowercase filter here to print student names in 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

An expression that returns a number using a pipe character. Here, we added a filter that USES currency format for printing costs. 


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

Filters of filters

To display only the desired topics, we use subjectName as the 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>

Sort filter

To sort topics by tag, we use the orderBy tag.

Subject: 


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

example

The following example shows all of the above filters.

testAngularJS.html 


<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>

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