将自定义字段添加到导航菜单项

Question

我正在尝试将自定义数据添加到我的菜单项（例如，data-*属性）或下拉列表以选择链接target等。

通过屏幕选项，我们有链接目标，标题属性，CSS类，链接关系（XFN）和描述（见下面的截图），但没有一个真正提供我想要的。

我想过寻找高级自定义字段的扩展，或类似的东西，但我没有看到类似的东西，也没有通过我的主题functions.php文件。

Answer 1

您可以尝试Carbon Fields Framework它为菜单项提供自定义字段。即使你正在使用AFC，你仍然可以添加插件，两者都可以一起工作。

Answer 2

我终于找到了a good tutorial with lots of details and explanations如何实现这一点。这篇文章解释了WordPress plugin Sweet Custom Menu的工作原理，并且我已经能够将功能添加到我当前的主题中。

截至今天，插件已经过两年多时间更新，但它仍然可以达到预期效果。

Answer 3

我遇到了同样的问题，我可以找到一个ACF插件，可以为菜单项启用自定义字段。它被称为location-nav-menu-for-acf，可以在这里找到：https://wordpress.org/plugins/location-nav-menu-for-acf/

Answer 4

add_filter( 'wp_edit_nav_menu_walker', 'custom_nav_edit_walker',10,2 );
function custom_nav_edit_walker($walker,$menu_id) {
    return 'Walker_Nav_Menu_Edit_Custom';
}

/*
 * Saves new field navmenu
 */
add_action('wp_update_nav_menu_item', 'custom_nav_update',10, 3);
function custom_nav_update($menu_id, $menu_item_db_id, $args ) {
    if ( is_array($_REQUEST['menu-item-custom']) ) {
        $custom_value = $_REQUEST['menu-item-custom'][$menu_item_db_id];
        update_post_meta( $menu_item_db_id, '_menu_item_custom', $custom_value );
    }
}

/*
 * Adds value of new field to Navmenu
 */
add_filter( 'wp_setup_nav_menu_item','custom_nav_item' );
function custom_nav_item($menu_item) {
    $menu_item->custom = get_post_meta( $menu_item->ID, '_menu_item_custom', true );
    return $menu_item;
}


class Walker_Nav_Menu_Edit_Custom extends Walker_Nav_Menu  {
    function start_lvl( &$output, $depth = 0, $args = array() ) {}

        /**
         * Ends the list of after the elements are added.
         *
         * @see Walker_Nav_Menu::end_lvl()
         *
         * @since 3.0.0
         *
         * @param string $output Passed by reference.
         * @param int    $depth  Depth of menu item. Used for padding.
         * @param array  $args   Not used.
         */
         function end_lvl( &$output, $depth = 0, $args = array() ) {}

        /**
         * Start the element output.
         *
         * @see Walker_Nav_Menu::start_el()
         * @since 3.0.0
         *
         * @global int $_wp_nav_menu_max_depth
         *
         * @param string $output Used to append additional content (passed by reference).
         * @param object $item   Menu item data object.
         * @param int    $depth  Depth of menu item. Used for padding.
         * @param array  $args   Not used.
         * @param int    $id     Not used.
         */
         function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
            global $_wp_nav_menu_max_depth;
            $_wp_nav_menu_max_depth = $depth > $_wp_nav_menu_max_depth ? $depth : $_wp_nav_menu_max_depth;

            ob_start();
            $item_id      = esc_attr( $item->ID );
            $removed_args = array(
                'action',
                'customlink-tab',
                'edit-menu-item',
                'menu-item',
                'page-tab',
                '_wpnonce',
            );

            $original_title = false;
            if ( 'taxonomy' == $item->type ) {
                $original_title = get_term_field( 'name', $item->object_id, $item->object, 'raw' );
                if ( is_wp_error( $original_title ) ) {
                    $original_title = false;
                }
            } elseif ( 'post_type' == $item->type ) {
                $original_object = get_post( $item->object_id );
                $original_title  = get_the_title( $original_object->ID );
            } elseif ( 'post_type_archive' == $item->type ) {
                $original_object = get_post_type_object( $item->object );
                if ( $original_object ) {
                    $original_title = $original_object->labels->archives;
                }
            }

            $classes = array(
                'menu-item menu-item-depth-' . $depth,
                'menu-item-' . esc_attr( $item->object ),
                'menu-item-edit-' . ( ( isset( $_GET['edit-menu-item'] ) && $item_id == $_GET['edit-menu-item'] ) ? 'active' : 'inactive' ),
            );

            $title = $item->title;

            if ( ! empty( $item->_invalid ) ) {
                $classes[] = 'menu-item-invalid';
                /* translators: %s: title of menu item which is invalid */
                $title = sprintf( __( '%s (Invalid)' ), $item->title );
            } elseif ( isset( $item->post_status ) && 'draft' == $item->post_status ) {
                $classes[] = 'pending';
                /* translators: %s: title of menu item in draft status */
                $title = sprintf( __( '%s (Pending)' ), $item->title );
            }

            $title = ( ! isset( $item->label ) || '' == $item->label ) ? $title : $item->label;

            $submenu_text = '';
            if ( 0 == $depth ) {
                $submenu_text = 'style="display: none;"';
            }

            ?>
            <li id="menu-item-<?php echo $item_id; ?>" class="<?php echo implode( ' ', $classes ); ?>">
                <div class="menu-item-bar">
                    <div class="menu-item-handle">
                        <span class="item-title"><span class="menu-item-title"><?php echo esc_html( $title ); ?></span> <span class="is-submenu" <?php echo $submenu_text; ?>><?php _e( 'sub item' ); ?></span></span>
                        <span class="item-controls">
                            <span class="item-type"><?php echo esc_html( $item->type_label ); ?></span>
                            <span class="item-order hide-if-js">
                                <a href="
                                <?php
                                    echo wp_nonce_url(
                                        add_query_arg(
                                            array(
                                                'action'    => 'move-up-menu-item',
                                                'menu-item' => $item_id,
                                            ),
                                            remove_query_arg( $removed_args, admin_url( 'nav-menus.php' ) )
                                        ),
                                        'move-menu_item'
                                    );
                                ?>
                                " class="item-move-up" aria-label="<?php esc_attr_e( 'Move up' ); ?>">&#8593;</a>
                                |
                                <a href="
                                <?php
                                    echo wp_nonce_url(
                                        add_query_arg(
                                            array(
                                                'action'    => 'move-down-menu-item',
                                                'menu-item' => $item_id,
                                            ),
                                            remove_query_arg( $removed_args, admin_url( 'nav-menus.php' ) )
                                        ),
                                        'move-menu_item'
                                    );
                                ?>
                                " class="item-move-down" aria-label="<?php esc_attr_e( 'Move down' ); ?>">&#8595;</a>
                            </span>
                            <a class="item-edit" id="edit-<?php echo $item_id; ?>" href="
                                                                        <?php
                                                                        echo ( isset( $_GET['edit-menu-item'] ) && $item_id == $_GET['edit-menu-item'] ) ? admin_url( 'nav-menus.php' ) : add_query_arg( 'edit-menu-item', $item_id, remove_query_arg( $removed_args, admin_url( 'nav-menus.php#menu-item-settings-' . $item_id ) ) );
                                                                        ?>
                            " aria-label="<?php esc_attr_e( 'Edit menu item' ); ?>"><span class="screen-reader-text"><?php _e( 'Edit' ); ?></span></a>
                        </span>
                    </div>
                </div>

                <div class="menu-item-settings wp-clearfix" id="menu-item-settings-<?php echo $item_id; ?>">
                    <?php if ( 'custom' == $item->type ) : ?>
                        <p class="field-url description description-wide">
                            <label for="edit-menu-item-url-<?php echo $item_id; ?>">
                                <?php _e( 'URL' ); ?><br />
                                <input type="text" id="edit-menu-item-url-<?php echo $item_id; ?>" class="widefat code edit-menu-item-url" name="menu-item-url[<?php echo $item_id; ?>]" value="<?php echo esc_attr( $item->url ); ?>" />
                            </label>
                        </p>
                    <?php endif; ?>
                    <p class="description description-wide">
                        <label for="edit-menu-item-title-<?php echo $item_id; ?>">
                            <?php _e( 'Navigation Label' ); ?><br />
                            <input type="text" id="edit-menu-item-title-<?php echo $item_id; ?>" class="widefat edit-menu-item-title" name="menu-item-title[<?php echo $item_id; ?>]" value="<?php echo esc_attr( $item->title ); ?>" />
                        </label>
                    </p>
                    <p class="field-title-attribute field-attr-title description description-wide">
                        <label for="edit-menu-item-attr-title-<?php echo $item_id; ?>">
                            <?php _e( 'Title Attribute' ); ?><br />
                            <input type="text" id="edit-menu-item-attr-title-<?php echo $item_id; ?>" class="widefat edit-menu-item-attr-title" name="menu-item-attr-title[<?php echo $item_id; ?>]" value="<?php echo esc_attr( $item->post_excerpt ); ?>" />
                        </label>
                    </p>
                    <p class="field-link-target description">
                        <label for="edit-menu-item-target-<?php echo $item_id; ?>">
                            <input type="checkbox" id="edit-menu-item-target-<?php echo $item_id; ?>" value="_blank" name="menu-item-target[<?php echo $item_id; ?>]"<?php checked( $item->target, '_blank' ); ?> />
                            <?php _e( 'Open link in a new tab' ); ?>
                        </label>
                    </p>
                    <p class="field-css-classes description description-thin">
                        <label for="edit-menu-item-classes-<?php echo $item_id; ?>">
                            <?php _e( 'CSS Classes (optional)' ); ?><br />
                            <input type="text" id="edit-menu-item-classes-<?php echo $item_id; ?>" class="widefat code edit-menu-item-classes" name="menu-item-classes[<?php echo $item_id; ?>]" value="<?php echo esc_attr( implode( ' ', $item->classes ) ); ?>" />
                        </label>
                    </p>
                    <p class="field-xfn description description-thin">
                        <label for="edit-menu-item-xfn-<?php echo $item_id; ?>">
                            <?php _e( 'Link Relationship (XFN)' ); ?><br />
                            <input type="text" id="edit-menu-item-xfn-<?php echo $item_id; ?>" class="widefat code edit-menu-item-xfn" name="menu-item-xfn[<?php echo $item_id; ?>]" value="<?php echo esc_attr( $item->xfn ); ?>" />
                        </label>
                    </p>
                    <p class="field-description description description-wide">
                        <label for="edit-menu-item-description-<?php echo $item_id; ?>">
                            <?php _e( 'Description' ); ?><br />
                            <textarea id="edit-menu-item-description-<?php echo $item_id; ?>" class="widefat edit-menu-item-description" rows="3" cols="20" name="menu-item-description[<?php echo $item_id; ?>]"><?php echo esc_html( $item->description ); // textarea_escaped ?></textarea>
                            <span class="description"><?php _e( 'The description will be displayed in the menu if the current theme supports it.' ); ?></span>
                        </label>
                    </p>
                    <p class="field-custom description description-wide">
                        <label for="edit-menu-item-custom-<?php echo $item_id; ?>">
                            <?php _e( 'Custom' ); ?><br />
                            <input type="text" id="edit-menu-item-custom-<?php echo $item_id; ?>" class="widefat code edit-menu-item-custom" name="menu-item-custom[<?php echo $item_id; ?>]" value="<?php echo esc_attr( $item->custom ); ?>" />
                        </label>
                    </p>                
                    <fieldset class="field-move hide-if-no-js description description-wide">
                        <span class="field-move-visual-label" aria-hidden="true"><?php _e( 'Move' ); ?></span>
                        <button type="button" class="button-link menus-move menus-move-up" data-dir="up"><?php _e( 'Up one' ); ?></button>
                        <button type="button" class="button-link menus-move menus-move-down" data-dir="down"><?php _e( 'Down one' ); ?></button>
                        <button type="button" class="button-link menus-move menus-move-left" data-dir="left"></button>
                        <button type="button" class="button-link menus-move menus-move-right" data-dir="right"></button>
                        <button type="button" class="button-link menus-move menus-move-top" data-dir="top"><?php _e( 'To the top' ); ?></button>
                    </fieldset>

                    <div class="menu-item-actions description-wide submitbox">
                        <?php if ( 'custom' != $item->type && $original_title !== false ) : ?>
                            <p class="link-to-original">
                                <?php
                                /* translators: %s: original title */
                                printf( __( 'Original: %s' ), '<a href="' . esc_attr( $item->url ) . '">' . esc_html( $original_title ) . '</a>' );
                                ?>
                            </p>
                        <?php endif; ?>
                        <a class="item-delete submitdelete deletion" id="delete-<?php echo $item_id; ?>" href="
                                                                                            <?php
                                                                                            echo wp_nonce_url(
                                                                                                add_query_arg(
                                                                                                    array(
                                                                                                        'action'    => 'delete-menu-item',
                                                                                                        'menu-item' => $item_id,
                                                                                                    ),
                                                                                                    admin_url( 'nav-menus.php' )
                                                                                                ),
                                                                                                'delete-menu_item_' . $item_id
                                                                                            );
                                                                                            ?>
                        "><?php _e( 'Remove' ); ?></a> <span class="meta-sep hide-if-no-js"> | </span> <a class="item-cancel submitcancel hide-if-no-js" id="cancel-<?php echo $item_id; ?>" href="
                        <?php
                        echo esc_url(
                            add_query_arg(
                                array(
                                    'edit-menu-item' => $item_id,
                                    'cancel'         => time(),
                                ),
                                admin_url( 'nav-menus.php' )
                            )
                        );
                        ?>
                            #menu-item-settings-<?php echo $item_id; ?>"><?php _e( 'Cancel' ); ?></a>
                    </div>

                    <input class="menu-item-data-db-id" type="hidden" name="menu-item-db-id[<?php echo $item_id; ?>]" value="<?php echo $item_id; ?>" />
                    <input class="menu-item-data-object-id" type="hidden" name="menu-item-object-id[<?php echo $item_id; ?>]" value="<?php echo esc_attr( $item->object_id ); ?>" />
                    <input class="menu-item-data-object" type="hidden" name="menu-item-object[<?php echo $item_id; ?>]" value="<?php echo esc_attr( $item->object ); ?>" />
                    <input class="menu-item-data-parent-id" type="hidden" name="menu-item-parent-id[<?php echo $item_id; ?>]" value="<?php echo esc_attr( $item->menu_item_parent ); ?>" />
                    <input class="menu-item-data-position" type="hidden" name="menu-item-position[<?php echo $item_id; ?>]" value="<?php echo esc_attr( $item->menu_order ); ?>" />
                    <input class="menu-item-data-type" type="hidden" name="menu-item-type[<?php echo $item_id; ?>]" value="<?php echo esc_attr( $item->type ); ?>" />
                </div><!-- .menu-item-settings-->
                <ul class="menu-item-transport"></ul>
            <?php
            $output .= ob_get_clean();
        }
}