Angular Filters Introduction for Beginners with CodeGPT

In Angular, filters are used to format data before it is displayed to the user. Filters can be used to manipulate data, change its formatting, and transform it in various ways. Filters are extremely powerful and can greatly enhance the user experience of your Angular application.

In this tutorial, we will cover 10 commonly used filters in Angular, along with examples of how to use them in your Angular application.

1. Currency Filter: The currency filter is used to format a number as a currency. It takes an optional parameter that specifies the currency symbol to be used. Here is an example of how to use the currency filter in Angular:

{{ price | currency:'USD' }}

1. Date Filter: The date filter is used to format a date. It takes an optional parameter that specifies the format of the date. Here is an example of how to use the date filter in Angular:

{{ date | date:'yyyy-MM-dd' }}

1. Uppercase Filter: The uppercase filter is used to convert a string to uppercase. Here is an example of how to use the uppercase filter in Angular:

{{ text | uppercase }}

1. Lowercase Filter: The lowercase filter is used to convert a string to lowercase. Here is an example of how to use the lowercase filter in Angular:

{{ text | lowercase }}

1. Number Filter: The number filter is used to format a number. It takes an optional parameter that specifies the number of decimal places to display. Here is an example of how to use the number filter in Angular:

{{ number | number:2 }}

1. Json Filter: The json filter is used to convert an object to a JSON string. Here is an example of how to use the json filter in Angular:

{{ object | json }}

1. LimitTo Filter: The limitTo filter is used to limit the number of items displayed in an array. Here is an example of how to use the limitTo filter in Angular:

<div ng-repeat="item in items | limitTo:5">
  {{ item }}
</div>

1. Filter Filter: The filter filter is used to filter an array based on a given expression. Here is an example of how to use the filter filter in Angular:

<div ng-repeat="item in items | filter:'searchTerm'">
  {{ item }}
</div>

1. OrderBy Filter: The orderBy filter is used to order an array by a given expression. Here is an example of how to use the orderBy filter in Angular:

<div ng-repeat="item in items | orderBy:'propertyName'">
  {{ item }}
</div>

1. Custom Filter: You can also create custom filters in Angular. Custom filters are created using the filter method of the Angular module. Here is an example of how to create and use a custom filter in Angular:

angular.module('app', [])
  .filter('customFilter', function() {
    return function(input) {
      return input.toUpperCase();
    };
  });

{{ text | customFilter }}

In conclusion, filters are a powerful feature of Angular that can greatly enhance the user experience of your application. By using built-in filters and creating custom filters, you can easily format and manipulate data in your Angular application. I hope this tutorial has helped you understand the basics of filters in Angular and how to use them in your own projects.