问题描述
是否可以向菜单项添加自定义字段？
我想做的是在 wp 菜单界面中添加 「法语导航标签」 和 「法语标题属性」 的字段。
最佳解决方案
这将添加一个自定义字段到菜单项编辑。但是，在保存新添加的菜单项的菜单之前，您将看不到自定义字段。当您首次添加项目时，您将只看到标准字段。保存后，新的字段将可用于编辑。如果添加其他菜单项，您将再次保存菜单以查看和编辑新添加的项目的自定义字段。我希望这个解释是有道理的。
我可以创建和使用自定义步行器来创建菜单项编辑字段。当您首先在菜单中添加菜单项时，似乎完全用 jQuery 而不是 Walker 创建它，这就是为什么直到保存后才会看到自定义字段。
我创造性地称自定义字段我添加了”custom” 。所以你可以改变/编辑/复制你需要的任何值。在步行者中有评论显示我添加新字段的位置。
我希望这是有帮助的。
<?php
/**
* @package nav-menu-custom-fields
* @version 0.1.0
*/
/*
Plugin Name: Nav Menu Custom Fields
*/
/*
* Saves new field to postmeta for navigation
*/
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 $item object that will be passed to Walker_Nav_Menu_Edit_Custom
*/
add_filter( 'wp_setup_nav_menu_item','custom_nav_item' );
function custom_nav_item($menu_item) {
$menu_item->custom = get_post_meta( $menu_item->ID, '_menu_item_custom', true );
return $menu_item;
}
add_filter( 'wp_edit_nav_menu_walker', 'custom_nav_edit_walker',10,2 );
function custom_nav_edit_walker($walker,$menu_id) {
return 'Walker_Nav_Menu_Edit_Custom';
}
/**
* Copied from Walker_Nav_Menu_Edit class in core
*
* Create HTML list of nav menu input items.
*
* @package WordPress
* @since 3.0.0
* @uses Walker_Nav_Menu
*/
class Walker_Nav_Menu_Edit_Custom extends Walker_Nav_Menu {
/**
* @see Walker_Nav_Menu::start_lvl()
* @since 3.0.0
*
* @param string $output Passed by reference.
*/
function start_lvl(&$output) {}
/**
* @see Walker_Nav_Menu::end_lvl()
* @since 3.0.0
*
* @param string $output Passed by reference.
*/
function end_lvl(&$output) {
}
/**
* @see Walker::start_el()
* @since 3.0.0
*
* @param string $output Passed by reference. Used to append additional content.
* @param object $item Menu item data object.
* @param int $depth Depth of menu item. Used for padding.
* @param object $args
*/
function start_el(&$output, $item, $depth, $args) {
global $_wp_nav_menu_max_depth;
$_wp_nav_menu_max_depth = $depth > $_wp_nav_menu_max_depth ? $depth : $_wp_nav_menu_max_depth;
$indent = ( $depth ) ? str_repeat( "t", $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 = '';
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 = $original_object->post_title;
}
$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 = empty( $item->label ) ? $title : $item->label;
?>
<li id="menu-item-<?php echo $item_id; ?>" class="<?php echo implode(' ', $classes ); ?>">
<dl class="menu-item-bar">
<dt class="menu-item-handle">
<span class="item-title"><?php echo esc_html( $title ); ?></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"><abbr title="<?php esc_attr_e('Move up'); ?>">↑</abbr></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"><abbr title="<?php esc_attr_e('Move down'); ?>">↓</abbr></a>
</span>
<a class="item-edit" id="edit-<?php echo $item_id; ?>" title="<?php esc_attr_e('Edit Menu Item'); ?>" 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 ) ) );
?>"><?php _e( 'Edit Menu Item' ); ?></a>
</span>
</dt>
</dl>
<div class="menu-item-settings" 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-thin">
<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="description description-thin">
<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 window/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>
<?php
/*
* This is the added field
*/
?>
<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>
<?php
/*
* end added field
*/
?>
<div class="menu-item-actions description-wide submitbox">
<?php if( 'custom' != $item->type && $original_title !== false ) : ?>
<p class="link-to-original">
<?php 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' => $item_id,
),
remove_query_arg($removed_args, admin_url( 'nav-menus.php' ) )
),
'delete-menu_item_' . $item_id
); ?>"><?php _e('Remove'); ?></a> <span class="meta-sep"> | </span> <a class="item-cancel submitcancel" id="cancel-<?php echo $item_id; ?>" href="<?php echo esc_url( add_query_arg( array('edit-menu-item' => $item_id, 'cancel' => time()), remove_query_arg( $removed_args, 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();
}
}
?>
参考文献
注：本文内容整合自 Google/Baidu/Bing 辅助翻译的英文资料结果。如果您对结果不满意，可以加入我们改善翻译效果：薇晓朵技术论坛。