quick edit custom meta

<?php
/**
     *
     * Add 'Disponibilità' in Quick Edit
     */

    function etdispo_quickedit_custom_posts_columns( $posts_columns ) {
        $posts_columns['et2018-quantita_birra'] = __( 'Disponibilità', 'etdispo' );
        return $posts_columns;
    }
    add_filter( 'manage_post_posts_columns', 'etdispo_quickedit_custom_posts_columns' );

    function etdispo_quickedit_custom_column_display( $column_name, $post_id ) {
        if ( 'et2018-quantita_birra' == $column_name ) {
            $etdispo_regi = get_post_meta( $post_id, 'et2018-quantita_birra', true );

            if ( $etdispo_regi ) {
                echo esc_html( $etdispo_regi );
            } else {
                esc_html_e( 'N/A', 'etdispo' );
            }
        }
    }
    add_action( 'manage_post_posts_custom_column', 'etdispo_quickedit_custom_column_display', 10, 2 );

    function etdispo_quickedit_fields( $column_name, $post_type, $post_id ) {
        if ( 'et2018-quantita_birra' != $column_name )
            return;
        $etdispo_regi = get_post_meta( $post_id, 'et2018-quantita_birra', true );
        ?>
        <fieldset class="inline-edit-col-right">
            <div class="inline-edit-col">
                <label>
                    <span class="title"><?php esc_html_e( 'Disponibilità', 'etdispo' ); ?></span>
                    <span class="input-text-wrap">
                    <input type="text" name="et2018-quantita_birra" class="etdispoedit" value="">
                </span>
                </label>
            </div>
        </fieldset>
        <?php
    }
    add_action( 'quick_edit_custom_box', 'etdispo_quickedit_fields', 10, 3 );
    function etdispo_quickedit_save_post( $post_id, $post ) {
        // if called by autosave, then bail here
        if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE )
            return;

        // if this "post" post type?
        if ( $post->post_type != 'post' )
            return;

        // does this user have permissions?
        if ( ! current_user_can( 'edit_post', $post_id ) )
            return;

        // update!
        if ( isset( $_POST['et2018-quantita_birra'] ) ) {
            update_post_meta( $post_id, 'et2018-quantita_birra', $_POST['et2018-quantita_birra'] );
        }
    }
    add_action( 'save_post', 'etdispo_quickedit_save_post', 10, 2 );

    function etdispo_quickedit_javascript() {
        $current_screen = get_current_screen();
        if ( $current_screen->id != 'edit-post' || $current_screen->post_type != 'post' )
            return;

        // Ensure jQuery library loads
        wp_enqueue_script( 'jquery' );
        ?>
        <script type="text/javascript">
            jQuery( function( $ ) {
                $( '#the-list' ).on( 'click', 'a.editinline', function( e ) {
                    e.preventDefault();
                    var editDispo = $(this).data( 'edit-dispo' );
                    inlineEditPost.revert();
                    $( '.etdispoedit' ).val( editDispo ? editDispo : '' );
                });
            });
        </script>
        <?php
    }
    add_action( 'admin_print_footer_scripts-edit.php', 'etdispo_quickedit_javascript' );
    /* Qui */
    function etdispo_quickedit_set_data( $actions, $post ) {
        $found_value = get_post_meta( $post->ID, 'et2018-quantita_birra', true );

        if ( $found_value ) {
            if ( isset( $actions['inline hide-if-no-js'] ) ) {
                $new_attribute = sprintf( 'data-edit-dispo="%s"', esc_attr( $found_value ) );
                $actions['inline hide-if-no-js'] = str_replace( 'class=', "$new_attribute class=", $actions['inline hide-if-no-js'] );
            }
        }

        return $actions;
    }
    add_filter('post_row_actions', 'etdispo_quickedit_set_data', 10, 2);