Ticket #64796: dummy-list-table.php

<?php
/**
 * Plugin Name: Dummy List Table
 * Description: Minimal list table example with extra_tablenav button.
 */

add_action( 'admin_menu', function() {
        add_management_page(
                'Dummy List Table',
                'Dummy List Table',
                'manage_options',
                'dummy-list-table',
                function() {
                        $table = new Dummy_List_Table();
                        $table->prepare_items();
                        echo '<div class="wrap">';
                        echo '<h1>Dummy List Table</h1>';
                        echo '<form method="post">';
                        $table->display();
                        echo '</form>';
                        echo '</div>';
                }
        );
} );

add_action( 'admin_init', function() {
        class Dummy_List_Table extends WP_List_Table {
                public function get_columns() {
                        return array(
                                'title' => 'Title',
                                'value' => 'Value',
                        );
                }

                public function prepare_items() {
                        $this->_column_headers = array( $this->get_columns(), array(), array() );
                        $this->items = array(
                                array( 'title' => 'Item One', 'value' => 'Alpha' ),
                                array( 'title' => 'Item Two', 'value' => 'Beta' ),
                                array( 'title' => 'Item Three', 'value' => 'Gamma' ),
                        );
                }

                protected function column_default( $item, $column_name ) {
                        return esc_html( $item[ $column_name ] );
                }

                protected function extra_tablenav( $which ) {
                        printf(
                                '<button class="button" type="submit" name="dummy_action" value="export">%s</button>',
                                esc_html( 'Export' )
                        );
                }
        }
} );