Ticket #43003: HTML5required.php

<?php
declare(strict_types=1);
namespace HTML5required;

// Reject attempt to launch this script stand-alone.
if ( !defined( '\ABSPATH' ) ) { http_response_code( 403 ); exit( 'This script must not be launched stand-alone!' ); }

/**
 * HTML5 "required" Bug Widget.
 *
 * @author      Andy Schmidt <Andy_Schmidt@HM-Software.com>
 * @copyright   2017 H&M Systems Software, Inc.
 *
 * @wordpress-plugin
 * Plugin Name: HTML5required
 * Description: Reproduces bug with HTML5 "required" attribute in Widget form. Tested with WordPress 4.9.1 on PHP 7.1.12.
 * Version:     1.00.00
 * Author:      H&M Systems Software, Inc.
 */

error_reporting( E_ALL ); 
ini_set( 'display_errors', '1' );

\add_action( 'widgets_init', function(): void { \register_widget( __NAMESPACE__.'\Widget_HTML5works' ); } );
\add_action( 'widgets_init', function(): void { \register_widget( __NAMESPACE__.'\Widget_HTML5fails' ); } );

return;

class Widget_HTML5works extends \WP_Widget 
{
        public const BASE_ID            = 'html_does_work';             // Unique, lowercase base ID within WordPress.
        public const REQUIRED_ATTR      = '';                                   // NO "required" attribute in form();
        
        /*
         * Initializes the instance variables.
         */
        public function __construct() 
        {
                parent::__construct(    // Initialize instance variables.
                        static::BASE_ID, 
                        static::BASE_ID,                                                        // Name for the widget displayed on the configuration page.
                        [       //  Widget options for wp_register_sidebar_widget().
                                'description'   => 'Reproduces bug with HTML5 required attribute in Widget form.',
                                'classname'             => static::BASE_ID,
                        ]       
                );
        }
        
        /**
         * Front-end display of widget.
         *
         * @param array $args                           Display arguments, including the opening/closing HTML elements. 
         * @param array $instance                       Saved settings for this instance of the widget.
         *
         * @see WP_Widget::widget()
         */
        public function widget( $args, $instance )
        {
                /*
                 * Opening HTML Elements for the Container.
                 */
                echo $args[ 'before_widget' ];
                if ( !empty( $title ) ) {
                        echo $args[ 'before_title' ] . \apply_filters( 'widget_title', $instance[ 'title' ] ) . $args[ 'after_title' ];
                }
                
                /*
                 * Display Content.
                 */
                echo 'Hello World';
                
                /*
                 * Closing HTML Elements for the Container.
                 */
                echo $args[ 'after_widget' ];
        }
        
        /**
         * Back-end widget form.
         * 
         * Outputs the settings update form. The default width of the fully expanded
         * control form is 250 and changing it is discouraged.
         *
         * @param array $old_settings           Current settings for this instance.
         *
         * @return string                                       'noform' will hide the "save" button.
         * 
         * @see WP_Widget::form()
         */
        public function form( $old_settings )
        {
                ?>
<p>
        <label for="<?php echo \esc_attr( $this->get_field_id( 'title' ) ); ?>">Title:</label> 
        <input class="widefat" title="Optional title used for this instance." type="text" id="<?php echo \esc_attr( $this->get_field_id( 'title' ) ); ?>" name="<?php echo \esc_attr( $this->get_field_name( 'title' ) ); ?>" value="<?php echo \esc_attr( $old_settings[ 'title' ] ?? '' ); ?>">
</p>
<p>
        <label for="<?php echo \esc_attr( $this->get_field_id( 'addtlfld' ) ); ?>">Text:</label> 
        <input class="widefat" title="Additional text fails if required input." type="text" <?php echo static::REQUIRED_ATTR; ?>id="<?php echo \esc_attr( $this->get_field_id( 'addtlfld' ) ); ?>" name="<?php echo \esc_attr( $this->get_field_name( 'addtlfld' ) ); ?>" value="<?php echo \esc_attr( $old_settings[ 'addtlfld' ] ?? '' ); ?>">
</p>

        <?php
                return ''; 
        }
        
        /**
         * Sanitize and widget form values before saving.
         *
         * @param array $input                          Values gathered by settings update form.
         * @param array $old_settings           Previously saved instance settings from database.
         *
         * @return array|bool                           Sanitized instance settings to be saved. FALSE = Skip saving.
         * 
         * @see WP_Widget::update()
         */
        public function update( $input, $old_settings )
        {
                // processes widget options to be saved
                return $input;
        }
}

class Widget_HTML5fails extends Widget_HTML5works
{
        public const BASE_ID            = 'html_will_fail';                     // Unique, lowercase base ID within WordPress.
        public const REQUIRED_ATTR      = ' required="required" ';
}


/*EOF*/