wp_nav_menu为<div>和<ul>生成默认类，产生以下内容....
<div class="menu-horizontal-container">
<ul id="menu-horizontal" class="menu">
<li id="menu-item-14" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-14"><a href="#">Menu 1</a></li>
<li id="menu-item-18" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-18"><a href="#">Menu 2</a></li>
<li id="menu-item-19" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-19"><a href="#">Menu 3</a></li>
</ul>
</div>
...但我想将类和ID更改为以下内容....如何才能完成？
<div class="collapse navbar-collapse">
<ul class="nav navbar-nav navbar-right" id="main_navigation_menu">
<li><a href="#">Menu 1</a></li>
<li><a href="#">Menu 2</a></li>
<li><a href="#">Menu 3</a></li>
</ul>
</div>
答案 0 :(得分：1)
这是将@Oleg和@Nathan的贡献与两种可能的输出相结合的解决方案......同样重要的是声明主题 location 而不是菜单名称。
输出A - 没有Walker_Nav_Menu功能
wp_nav_menu(array(
'theme_location' => 'primary',
'container' => 'div',
'container_class' => 'collapse navbar-collapse',
'menu_class' => 'nav navbar-nav navbar-right',
'menu_id' => 'main_navigation_menu',
)) ;
制备：
<div class="collapse navbar-collapse">
<ul id="main_navigation_menu" class="nav navbar-nav navbar-right">
<li id="menu-item-14" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-14"><a href="#">Menu 1</a></li>
<li id="menu-item-18" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-18"><a href="#">Menu 2</a></li>
<li id="menu-item-19" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-19"><a href="#">Menu 3</a></li>
</ul>
</div>
输出B - 使用Walker_Nav_Menu功能但是在参数中将'echo'更改为TRUE：
wp_nav_menu(array(
'theme_location' => 'primary',
'container' => 'div',
'container_class' => 'collapse navbar-collapse',
'menu_class' => 'nav navbar-nav navbar-right',
'menu_id' => 'main_navigation_menu',
'echo' => true,
'walker' => new Walker_Custom_Menu,
)) ;
制备：
<div class="collapse navbar-collapse">
<ul id="main_navigation_menu" class="nav navbar-nav navbar-right">
<li><a href="#/">Menu 1</a></li>
<li><a href="#">Menu 2</a></li>
<li><a href="#">Menu 3</a></li>
</ul>
</div>
感谢@Oleg和@Nathan。
答案 1 :(得分：0)
您需要调整传递给wp_nav_menu的参数。特别需要设置'menu_class'，'menu_id'和'container_class'。
示例：
wp_nav_menu( array(
'theme_location' => 'menu-horizontal',
'container_class' => 'collapse navbar-collapse',
. . .
) );
进一步阅读：https://developer.wordpress.org/reference/functions/wp_nav_menu/
答案 2 :(得分：0)
将其添加到要显示菜单的位置。
$menuParameters = array(
'theme_location' => 'header-menu',
'container' => 'div',
'container_class' => 'collapse navbar-collapse',
'menu_class' => 'nav navbar-nav navbar-right',
'menu_id' => 'main_navigation_menu',
'echo' => false,
'walker' => new Walker_Custom_Menu,
);
将walker添加到function.php
class Walker_Custom_Menu extends Walker_Nav_Menu {
/**
* Start the element output.
*
* @see Walker::start_el()
*
* @since 3.0.0
* @since 4.4.0 'nav_menu_item_args' filter was added.
*
* @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 array $args An array of arguments. @see wp_nav_menu()
* @param int $id Current item ID.
*/
public function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
$indent = ( $depth ) ? str_repeat( "\t", $depth ) : '';
$classes = empty( $item->classes ) ? array() : (array) $item->classes;
$classes[] = 'menu-item-' . $item->ID;
/**
* Filter the arguments for a single nav menu item.
*
* @since 4.4.0
*
* @param array $args An array of arguments.
* @param object $item Menu item data object.
* @param int $depth Depth of menu item. Used for padding.
*/
$args = apply_filters( 'nav_menu_item_args', $args, $item, $depth );
/**
* Filter the CSS class(es) applied to a menu item's list item element.
*
* @since 3.0.0
* @since 4.1.0 The `$depth` parameter was added.
*
* @param array $classes The CSS classes that are applied to the menu item's `<li>` element.
* @param object $item The current menu item.
* @param array $args An array of {@see wp_nav_menu()} arguments.
* @param int $depth Depth of menu item. Used for padding.
*/
$class_names = join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item, $args, $depth ) );
$class_names = $class_names ? ' class="' . esc_attr( $class_names ) . '"' : '';
/**
* Filter the ID applied to a menu item's list item element.
*
* @since 3.0.1
* @since 4.1.0 The `$depth` parameter was added.
*
* @param string $menu_id The ID that is applied to the menu item's `<li>` element.
* @param object $item The current menu item.
* @param array $args An array of {@see wp_nav_menu()} arguments.
* @param int $depth Depth of menu item. Used for padding.
*/
$id = apply_filters( 'nav_menu_item_id', 'menu-item-'. $item->ID, $item, $args, $depth );
$id = $id ? ' id="' . esc_attr( $id ) . '"' : '';
$output .= $indent . '<li>';
$atts = array();
$atts['title'] = ! empty( $item->attr_title ) ? $item->attr_title : '';
$atts['target'] = ! empty( $item->target ) ? $item->target : '';
$atts['rel'] = ! empty( $item->xfn ) ? $item->xfn : '';
$atts['href'] = ! empty( $item->url ) ? $item->url : '';
/**
* Filter the HTML attributes applied to a menu item's anchor element.
*
* @since 3.6.0
* @since 4.1.0 The `$depth` parameter was added.
*
* @param array $atts {
* The HTML attributes applied to the menu item's `<a>` element, empty strings are ignored.
*
* @type string $title Title attribute.
* @type string $target Target attribute.
* @type string $rel The rel attribute.
* @type string $href The href attribute.
* }
* @param object $item The current menu item.
* @param array $args An array of {@see wp_nav_menu()} arguments.
* @param int $depth Depth of menu item. Used for padding.
*/
$atts = apply_filters( 'nav_menu_link_attributes', $atts, $item, $args, $depth );
$attributes = '';
foreach ( $atts as $attr => $value ) {
if ( ! empty( $value ) ) {
$value = ( 'href' === $attr ) ? esc_url( $value ) : esc_attr( $value );
$attributes .= ' ' . $attr . '="' . $value . '"';
}
}
/** This filter is documented in wp-includes/post-template.php */
$title = apply_filters( 'the_title', $item->title, $item->ID );
/**
* Filter a menu item's title.
*
* @since 4.4.0
*
* @param string $title The menu item's title.
* @param object $item The current menu item.
* @param array $args An array of {@see wp_nav_menu()} arguments.
* @param int $depth Depth of menu item. Used for padding.
*/
$title = apply_filters( 'nav_menu_item_title', $title, $item, $args, $depth );
$item_output = $args->before;
$item_output .= '<a'. $attributes .'>';
$item_output .= $args->link_before . $title . $args->link_after;
$item_output .= '</a>';
$item_output .= $args->after;
/**
* Filter a menu item's starting output.
*
* The menu item's starting output only includes `$args->before`, the opening `<a>`,
* the menu item's title, the closing `</a>`, and `$args->after`. Currently, there is
* no filter for modifying the opening and closing `<li>` for a menu item.
*
* @since 3.0.0
*
* @param string $item_output The menu item's starting HTML output.
* @param object $item Menu item data object.
* @param int $depth Depth of menu item. Used for padding.
* @param array $args An array of {@see wp_nav_menu()} arguments.
*/
$output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
}
}