[ Close ] Introducing Carbon Fields Version 3 - now with Gutenberg Blocks Support


Documentation > Containers > Widgets


Widget containers are used to create custom widgets for your theme. Each widget is defined as a PHP class. Widget classes must extend the Widget class and must have at least two methods – constructor __construct() and front_end().

The constructor must be named after the class and it must call the method setup($name, $description, $fields, $classname), where:

Parameter Description
$name Name of the widget, used in the back-end
$description Description of the widget, used in the back-end
$fields Array of fields
$classname (optional) Provide a custom class attribute for the widget.

The front_end($args, $instance) method is responsible for rendering your widget in the front-end. Here you have access to all values saved for the fields you defined in the constructor via the $instance parameter.

After you define your class, it is important that you register your new widget during the widgets_init action.

use Carbon_Fields\Widget;
use Carbon_Fields\Field;

class ThemeWidgetExample extends Widget {
    // Register widget function. Must have the same name as the class
    function __construct() {
        $this->setup('Theme Widget - Example', 'Displays a block with title/text', array(
            Field::make('text', 'title', 'Title')->set_default_value('Hello World!'),
            Field::make('textarea', 'content', 'Content')->set_default_value('Lorem Ipsum dolor sit amet')

    // Called when rendering the widget in the front-end
    function front_end($args, $instance) {
        echo $args['before_title'] . $instance['title'] . $args['after_title'];
        echo '<p>' . $instance['content'] . '</p>';

function load_widgets() {

And you should add the following hook to your theme functions.php:

add_action('widgets_init', 'load_widgets');

You can setup control options (like width) of your widget by adding a $form_options definition at beginning of your custom widget class. Example:

protected $form_options = array(
    'width' => 500

In case you want to disable the default widget wrappers that come from your sidebar, you can disable $this->print_wrappers in the __construct() method of your widget. Example:

function __construct() {
    $this->setup('Widget Title', __('Widget Description'), array(
        Field::make('text', 'title', 'Title')->set_default_value('Hello World!'),

    $this->print_wrappers = false;

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