Updated March 23, 2023

Introduction to AngularJS Filters

The filter is used to filter the elements. In other words filter in angular js is used to filter the element and object and returned the filtered items. Basically filter selects a subset from the array from the original array.

Syntax:

{{ arrayexpression | filter : expression : comparator : anyPropertyKey }}

comparator: This property is used to determining the value, it compares the expected value from the filtered expression and the actual value from the object array.
anyPropertyKey: This is a special property that is used to match the value against the given property. it has a default value as $.
arrayexpression: It takes the array on which we applied the filter.
expression: It is used to select the items from the array after the filter conditions are met.

Example of AngularJS Filters

Following is an example of angularjs filters:

<!DOCTYPE html>
<html>
<head>
<title>AngularJS | filter Filter</title>
<script src=
"https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js">
</script>
</head>
<body>
<div ng-app="myApp" ng-controller="namesCtrl">
<h1 style="color:green;">Demo filter</h1>
<ol>
<strong>
<li ng-repeat="x in names | filter : 'm'">
{{ x }}
</li>
</strong>
</ol>
</div&gt
<script>
angular.module('myApp', []).controller(
'namesCtrl', function($scope) {
$scope.names = [
'xyz',
'abc',
'uth',
'ert',
'opu',
'wrf',
'mkl',
'hgt',
'mnv'
];
});
</script>
<p>
This will show the names contain "m" character filter.
</p>
</body>
</html>

Output:

List of the Filters available in AngularJS

Angular js provide many built-in filters which are listed below.

uppercase: This filter is used to format the string to upper case.
lowercase: This filter is used to format the string to lowercase.
currency: This filter is used to format a number to the current format.
orderBy: This filter is used to filter or order an array by an expression.
limitTo: This filter is used to limit the string/array into a specified length or number of elements or characters.
json: This filter is used to format the object to a JSON string.
filter: this filter selects the subset of items from an array.
date: This filter is used to format the date to the specified format.
number: This filter is used to format numbers to a string.

Examples to add filters to expression

Let us how to add filters to expression with the help of examples:

Example #1: Uppercase

Code:

<!DOCTYPE html>
<html>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js"></script>
<body>
<div ng-app="myApp" ng-controller="personCtrl">
<p>Upper case example: {{ lastName | uppercase }}</p>
</div>
<script>
angular.module('myApp', []).controller('personCtrl', function($scope) {
$scope.firstName = "xyz",
$scope.lastName = "abc"
});
</script>
</body>
</html>

Output :

Example #2: Lowercase

Code:

<!DOCTYPE html>
<html>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js"></script>
<body>
<div ng-app="myApp" ng-controller="personCtrl">
<p>Lower case example: {{ lastName | lowercase }}</p>
</div>
<script>
angular.module('myApp', []).controller('personCtrl', function($scope) {
$scope.firstName = "XYZ",
$scope.lastName = "ABC"
});
</script>
</body>
</html>

Output :

Example #3: currency

Code:

<!DOCTYPE html>
<html>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js"></script>
<body>
<div ng-app="myApp" ng-controller="currencyCtrl">
<h1>Price: {{ price | currency }}</h1>
</div>
<script>
var app = angular.module('myApp', []);
app.controller('currencyCtrl', function($scope) {
$scope.price = 60;
});
</script>
<p>Demo for currency filter. It will format a number to currency format</p>
</body>
</html>

Output :

Examples to add filters to directives

Let us see how to add filters to directives with the help of examples:

Example #1: orderBy

Code:

<!DOCTYPE html>
<html>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js"></script>
<body>
<p>Demo to show orderBy : </p>
<div ng-app="myApp" ng-controller="nameandcountryCtrl">
<table border="1" width="100%">
<tr>
<th ng-click="orderByMe('nameEmp')">Name Emp</th>
<th ng-click="orderByMe('countryEmp')">Country Emp</th>
</tr>
<tr ng-repeat="x in names | orderBy:myOrderBy">
<td>{{x.nameEmp}}</td>
<td>{{x.countryEmp}}</td>
</tr>
</table>
</div>
<script>
angular.module('myApp', []).controller('nameandcountryCtrl', function($scope) {
$scope.names = [
{nameEmp:'anil',countryEmp:'England'},
{nameEmp:'sumit',countryEmp:'Sweden'},
{nameEmp:'arpita',countryEmp:'Norway'},
{nameEmp:'pankaj',countryEmp:'Norway'},
{nameEmp:'joe',countryEmp:'Denmark'},
{nameEmp:'aman',countryEmp:'Sweden'},
{nameEmp:'viman',countryEmp:'Denmark'},
{nameEmp:'manav',countryEmp:'England'},
{nameEmp:'Kapil',countryEmp:'Netherland'}
];
$scope.orderByMe = function(x) {
$scope.myOrderBy = x;
}
});
</script>
</body>
</html>

Output :

Example #2: LimtTo

Code:

<!DOCTYPE html>
<html>
<script src=
"https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js">
</script>
<body>
<h2>Demo LimitTo </h2>
<br>
<br>
<div ng-app="myApp" ng-controller="myCtrl">
<strong>Input:</strong>
<br>
<input type="text" ng-model="string">
<br>
<br>
<strong>Output:</strong>
<br>
{{string|limitTo:8}}
</div>
<script>
var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
$scope.string = "";
});
</script>
</body>
</html>

Output:

Example #3: Json

Code:

<!DOCTYPE html>
<html>
<head>
<script src=
"https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js">
</script>
</head>
<body>
<div ng-app="result" ng-controller="resultCtrl">
<h1>JSON: To show name and salary</h1>
<pre>{{names | json}}</pre>
</div>
<script>
var app = angular.module('result', []);
app.controller('resultCtrl', function($scope) {
$scope.names = {
"Aman" : 356,
"Vijay" : 908,
"Pamkaj" : 645,
"Chinmay" : 195,
"Joe" : 740
};
});
</script>
</body>
</html>

Output :

Example #4: date

When we do not specify the date format it takes the default format as ‘MMM d, yyyy’. Here time zone parameter is optional. takes two parameter format and time zone.

Syntax:

{{ date | date : format : timezone }}

Some predefined date format is as follows:

“medium time”: Equivalent to “h:mm:ss a” (2:35:05 AM)
“short date”: Equivalent to “M/d/yy” (5/7/19)
“medium”: Equivalent to “MMM d, y h:mm: ss a”
“long date”: Equivalent to “MMMM d, y” (May 7, 2019)
“short”: Equivalent to “M/d/yy h: mm a”
“short-time”: Equivalent to “h: mm a” (2:35 AM)
“full date”: Equivalent to “EEEE, MMMM d, y” (Tuesday, May 7, 2019)
“medium date”: Equivalent to “MMM d, y” (May 7, 2019)

Code:

<!DOCTYPE html>
<html>
<head>
<title>Date Filter to show current date</title>
<script src=
"https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js">
</script>
</head>
<body>
<h5>Date Filter to show current date</h5>
<div ng-app="gfgApp" ng-controller="dateCntrl">
<p>{{ today | date : "dd.MM.y" }}</p>
</div>
<script>
var app = angular.module('gfgApp', []);
app.controller('dateCntrl', function($scope) {
$scope.today = new Date();
});
</script>
</body>
</html>

Output :

Example #5: number

code:

{{ string| number : fractionSize}}
<!DOCTYPE html>
<html>
<head>
<title>Number Filter</title>
<script src=
"https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js">
</script>
</head>
<body>
<div ng-app="gfgApp" ng-controller="numberCntrl">
<h3>Number filter demo</h3>
<p>Number : {{ value| number  : 2}}</p>
</div>
<script>
var app = angular.module('gfgApp', []);
app.controller('numberCntrl', function($scope) {
$scope.value = 75560.569;
});
</script>
</body>
</html>

Output:

Advantages of filters in AngularJs

Angular js provide us many built-in filters to filter our data according to our needs. But there is own more advantage that we can create our own custom filters.

Filters are used to manipulate our data. They provide faster processing and hence enhance the performance as well. Filters are very robust as well.

Conclusion

We can use filters anywhere in our angular application like a directive, expression, controller, etc. We can also create custom filters according to which property we want to sort our data. It also reduces code and makes it more readable and optimizes and by creating custom filters we can maintain them into separate files.

Quiz Result
Total Questions	Correct Answers	Wrong Answers	Percentage

Introduction to AngularJS Filters

Example of AngularJS Filters

List of the Filters available in AngularJS

Examples to add filters to expression

Example #1: Uppercase

Example #2: Lowercase

Examples to add filters to directives

Example #1: orderBy

Example #2: LimtTo

Example #3: Json

Example #4: date

Example #5: number

Advantages of filters in AngularJs

Conclusion

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