我希望在我的菜单的下拉菜单中显示菜单说明。
我正在使用带有下拉列表的Nav Menu Walker，该下拉菜单支持我当前菜单的Bootstrap，我有一个Nav Menu Walker的示例，只有描述。
我如何将描述放入下拉链接？ （链接 - 说明）
以下是带有描述的助行器：
$class_names = $value = '';
$classes = empty( $item->classes ) ? array() : (array) $item->classes;
$class_names = join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item ) );
$class_names = ' class="'. esc_attr( $class_names ) . '"';
$output .= $indent . '<li id="menu-item-'. $item->ID . '"' . $value . $class_names .'>';
$attributes = ! empty( $item->attr_title ) ? ' title="' . esc_attr( $item->attr_title ) .'"' : '';
$attributes .= ! empty( $item->target ) ? ' target="' . esc_attr( $item->target ) .'"' : '';
$attributes .= ! empty( $item->xfn ) ? ' rel="' . esc_attr( $item->xfn ) .'"' : '';
$attributes .= ! empty( $item->url ) ? ' href="' . esc_attr( $item->url ) .'"' : '';
$prepend = '<strong>';
$append = '</strong>';
$description = ! empty( $item->description ) ? '<span>'.esc_attr( $item->description ).'</span>' : '';
if($depth != 0)
{
$description = $append = $prepend = "";
}
$item_output = $args->before;
$item_output .= '<a'. $attributes .'>';
$item_output .= $args->link_before .$prepend.apply_filters( 'the_title', $item->title, $item->ID ).$append;
$item_output .= $description.$args->link_after;
$item_output .= '</a>';
$item_output .= $args->after;
$output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
}
}
这是我现在的步行者：
class wp_bootstrap_navwalker extends Walker_Nav_Menu {
/* Start of the <ul>
*
* Note on $depth: Counterintuitively, $depth here means the "depth right before we start this menu".
* So basically add one to what you'd expect it to be
*/
function start_lvl(&$output, $depth) {
$tabs = str_repeat("\t", $depth);
// If we are about to start the first submenu, we need to give it a dropdown-menu class
if ($depth == 0 || $depth == 1) { //really, level-1 or level-2, because $depth is misleading here (see note above)
$output .= "\n{$tabs}<ul class=\"dropdown-menu\">\n";
} else {
$output .= "\n{$tabs}<ul>\n";
}
return;
}
/* End of the <ul>
*
* Note on $depth: Counterintuitively, $depth here means the "depth right before we start this menu".
* So basically add one to what you'd expect it to be
*/
function end_lvl(&$output, $depth) {
if ($depth == 0) { // This is actually the end of the level-1 submenu ($depth is misleading here too!)
// we don't have anything special for Bootstrap, so we'll just leave an HTML comment for now
$output .= '<!--.dropdown-->';
}
$tabs = str_repeat("\t", $depth);
$output .= "\n{$tabs}</ul>\n";
return;
}
/* Output the <li> and the containing <a>
* Note: $depth is "correct" at this level
*/
function start_el(&$output, $item, $depth, $args) {
global $wp_query;
$indent = ($depth) ? str_repeat("\t", $depth) : '';
$class_names = $value = '';
$classes = empty($item->classes) ? array() : (array)$item->classes;
/* If this item has a dropdown menu, add the 'dropdown' class for Bootstrap */
if ($item->hasChildren) {
$classes[] = 'dropdown';
// level-1 menus also need the 'dropdown-submenu' class
if ($depth == 1) {
$classes[] = 'dropdown-submenu';
}
}
$prepend = '<strong>';
$append = '</strong>';
$description = !empty($item->description) ? '<span>' . esc_attr($item->description) . '</span>' : '';
if ($depth != 0) {
$description = $append = $prepend = "";
}
/* This is the stock Wordpress code that builds the <li> with all of its attributes */
$class_names = join(' ', apply_filters('nav_menu_css_class', array_filter($classes), $item));
$class_names = ' class="' . esc_attr($class_names) . '"';
$output .= $indent . '<li id="menu-item-' . $item->ID . '"' . $value . $class_names . '>';
$attributes = !empty($item->attr_title) ? ' title="' . esc_attr($item->attr_title) . '"' : '';
$attributes .= !empty($item->target) ? ' target="' . esc_attr($item->target) . '"' : '';
$attributes .= !empty($item->xfn) ? ' rel="' . esc_attr($item->xfn) . '"' : '';
$attributes .= !empty($item->url) ? ' href="' . esc_attr($item->url) . '"' : '';
$item_output = $args->before;
/* If this item has a dropdown menu, make clicking on this link toggle it */
if ($item->hasChildren && $depth == 0) {
$item_output .= '<a' . $attributes . ' class="dropdown-toggle" data-toggle="dropdown">';
} else {
$item_output .= '<a' . $attributes . '>';
}
$item_output .= $args->link_before . apply_filters('the_title', $item->title, $item->ID) . $args->link_after;
/* Output the actual caret for the user to click on to toggle the menu */
if ($item->hasChildren && $depth == 0) {
$item_output .= '<b class="caret"></b></a>';
} else {
$item_output .= '</a>';
}
$item_output .= $args->after;
$output .= apply_filters('walker_nav_menu_start_el', $item_output, $item, $depth, $args);
return;
}
/* Close the <li>
* Note: the <a> is already closed
* Note 2: $depth is "correct" at this level
*/
function end_el(&$output, $item, $depth, $args) {
$output .= '</li>';
return;
}
/* Add a 'hasChildren' property to the item
* Code from: http://wordpress.org/support/topic/how-do-i-know-if-a-menu-item-has-children-or-is-a-leaf#post-3139633
*/
function display_element($element, &$children_elements, $max_depth, $depth = 0, $args, &$output) {
// check whether this item has children, and set $item->hasChildren accordingly
$element->hasChildren = isset($children_elements[$element->ID]) && !empty($children_elements[$element->ID]);
// continue with normal behavior
return parent::display_element($element, $children_elements, $max_depth, $depth, $args, $output);
}
}
答案 0 :(得分：1)
目前还不完全清楚您要在何处放置说明，但是，例如，如果您想在链接标题之后使用它，则可以在start_el函数中的Walker中执行以下操作：< / p>
您目前的位置：
/* If this item has a dropdown menu, make clicking on this link toggle it */
if ($item->hasChildren && $depth == 0) {
$item_output .= '<a' . $attributes . ' class="dropdown-toggle" data-toggle="dropdown">';
} else {
$item_output .= '<a' . $attributes . '>';
}
$item_output .= $args->link_before . apply_filters('the_title', $item->title, $item->ID) . $args->link_after;
将最后一行替换为：
$item_output .= $args->link_before . apply_filters('the_title', $item->title, $item->ID);
$item_output .= ' - <span class="desc">' . $item->description . '</span>';
$item_output .= $args->link_after;
这会在标题后插入menu_item说明（如title - description）。
如果您只想要子菜单上的说明，请使用以下变体：
$item_output .= $args->link_before . apply_filters('the_title', $item->title, $item->ID);
if ($depth > 0) {
$item_output .= ' - <span class="desc">' . $item->description . '</span>';
}
$item_output .= $args->link_after;