Trending September 2023 # Angularjs Filters &Amp; Angularjs Custom Filter With Example # Suggested October 2023 # Top 11 Popular | Lifecanntwaitvn.com

Trending September 2023 # Angularjs Filters &Amp; Angularjs Custom Filter With Example # Suggested October 2023 # Top 11 Popular

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What is Filter in AngularJS?

A Filter in AngularJS helps to format the value of an expression to display to the user without changing the original format. For example, if you want your string in either lowercase or uppercase, you can do it using filters. There are built-in filters such as ‘lowercase’, ‘uppercase’, which can retrieve the lowercase and uppercase output accordingly.

AngularJS Custom Filter

Sometimes the built-in filters in Angular cannot meet the needs or requirements for filtering output. In such a case, an AngularJS custom filter can be created, which can pass the output in the required manner.

Similarly, for numbers, you can use other filters. During this tutorial, we will see the different standard built-in filters available in Angular.

In this tutorial, you will learn-

How to Create Custom Filter in AngularJS

In the below custom filter AngularJS example, we are going to pass a string to the view from the controller via the scope object, but we don’t want the string to be displayed as it is.

We want to ensure that whenever we display the string, we will pass a custom filter in AngularJS, which will append another string and display the completed string to the user.

var app = angular.module(‘DemoApp’,[]); app.filter(‘Demofilter’,function(){ return function(input) { return input + ” Tutorial” } });

app.controller(‘DemoController’,function($scope){

$scope.tutorial =”Angular”; });

Code Explanation:

Here we are passing a string “Angular” in a member variable called tutorial and attaching it to the scope object.

Angular provides the filter service which can be used to create our custom filter. The ‘Demofilter’ is a name given to our filter.

This is the standard way in which custom filters in AngularJS are defined wherein a function is returned. This function is what contains the custom code to create the custom filter. In our function, we are taking a string “Angular” which is passed from our view to the filter and appending the string “Tutorial” to this.

We are using our Demofilter on our member variable which was passed from the controller to the view.

If the code is executed successfully, the following Output will be shown when you run your code in the browser.

Output:

From the output,

It can be seen that our custom filter has been applied and

The word ‘Tutorial’ has been appended at the end of the string, which was passed in member variable tutorial.

Lowercase Filter in AngularJS

This filter takes on a string output and formats the string and displays all the characters in the string as lowercase.

Let’s look at an example of AngularJS filters with the AngularJS to lowercase option.

In the below example, we will use a controller to send a string to a view via the scope object. We will then use a filter in the view to convert the string to lowercase.

var app = angular.module(‘DemoApp’,[]); app.controller(‘DemoController’,function($scope){

$scope.tutorialName =”Angular JS”; });

Code Explanation:

Here we are passing a string, which is a combination of lowercase and uppercase characters in a member variable called “tutorialName” and attaching it to the scope object. The value of the string being passed is “AngularJS”.

If the code is executed successfully, the following Output will be shown when you run your code in the browser.

Output:

From the output

It can be seen that the string “AngularJS” which was passed in the variable tutorialName which was a combination of lowercase and uppercase characters has been executed.

After execution, the final output is in lowercase as shown above.

Uppercase Filter in AngularJS

This filter is similar to the lowercase filter; the difference is that takes on a string output and formats the string and displays all the characters in the string as uppercase.

Let’s look at an example of capitalize filter AngularJS with the lowercase option.

In the below AngularJS capitalize example, we will use a controller to send a string to a view via the scope object. We will then use a filter in the view to convert the string to uppercase.

var app = angular.module(‘DemoApp’,[]); app.controller(‘DemoController’,function($scope){

$scope.tutorialName =”Angular JS”; });

Code Explanation:

Here we are passing a string which is a combination of lowercase and uppercase characters “Angular JS” in a member variable called “tutorialName” and attaching it to the scope object.

If the code is executed successfully, the following Output will be shown when you run your code in the browser.

Output:

From the output,

It can be seen that the string which was passed in the variable tutorialName which was a combination of lowercase and uppercase characters has been outputted in all uppercase.

Number Filter in AngularJS

This filter formats a number and can apply a limit to the decimal points for a number.

Let’s look at an example of AngularJS filters with the number option.

In the example below,

We wanted to showcase how we can use the number filter to format a number to display with a restriction of 2 decimal places.

We will use a controller to send a number to a view via the scope object. We will then use a filter in the view to apply the number filter.

var app = angular.module(‘DemoApp’,[]); app.controller(‘DemoController’,function($scope){

$scope.tutorialID =3.565656; });

Code Explanation:

Here we are passing a number with a larger number of decimal places in a member variable called tutorialID and attaching it to the scope object.

If the code is executed successfully, the following Output will be shown when you run your code in the browser.

Output:

From the output,

It can be seen that the number which was passed in the variable tutorialID which had a large number of decimal points has been limited to 2 decimal places because of the number: 2 filters which was applied.

Currency Filter in AngularJS

This filter formats a currency filter to a number.

Suppose, if you wanted to display a number with a currency such as $, then this filter can be used.

In the below example, we will use a controller to send a number to a view via the scope object. We will then use a filter in the view to apply the current filter.

var app = angular.module(‘DemoApp’,[]); app.controller(‘DemoController’,function($scope){

$scope.tutorialprice =20.56; });

Code Explanation:

Here we are passing a number in a member variable called tutorialprice and attaching it to the scope object.

If the code is executed successfully, the following Output will be shown when you run your code in the browser.

Output:

From the output

It can be seen the currency symbol has been appended to the number which was passed in the variable tutorialprice.

In our case, since the language settings are English (United States), the $ symbol is inserted as the currency.

JSON Filter in AngularJS

This filter formats a JSON like input and applies the AngularJS JSON filter to give the output in JSON.

In the below example, we will use a controller to send a JSON type object to a view via the scope object. We will then use a filter in the view to apply the JSON filter.

var app = angular.module(‘DemoApp’,[]); app.controller(‘DemoController’,function($scope){

$scope.tutorial ={TutorialID:12,tutorialName:”Angular”}; });

Code Explanation:

Here we are passing a number in a member variable called “tutorial” and attaching it to the scope object. This member variable contains a JSON type string of Tutorial ID:12, and TutorialName:”Angular”.

If the code is executed successfully, the following Output will be shown when you run your code in the browser.

Output:

From the output,

It can be seen that the JSON like a string is parsed and displayed a proper JSON object in the browser.

Summary:

Filters are used to change the way the output is displayed to the user.

Angular provides built-in filters such as the lowercase and uppercase filters to change the output of strings to lower and uppercase respectively.

There is also a provision for changing the way numbers are displayed by using the number filter by specifying the number of decimal points to be displayed in the number.

One can also use the currency filter to append the currency symbol to any number.

If there is a requirement to have JSON specific output, angular also provides the JSON filter for filtering any JSON like string into JSON format.

If there is a requirement that is not met by any of the filters defined in angular, then you can create your custom filter and add your custom code to determine the type of output you want from the filter.

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