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站长朋友们在使用的过程中，当做成自适应网站，引入Bootstrap框架的时候，希望可以输出Bootstrap结构的导航栏菜单，这样就够利用Bootstrap提供的样式进行菜单的显示。这篇WordPress教程里我们就向大家介绍一下如何在wordpress网站中输出Bootstrap结构的菜单。 我们先来看一下Bootstrap导航栏结构HTML代码:
WordPress一般采用wp_nav_menu函数输出导航栏菜单，而通过该函数输出的菜单是得不到上述的html结构的。可喜的是wp_nav_menu函数支持自定义输出html结构。 wordpress中wp_nav_menu函数的参数如下所示： '','container' => 'div','container_class' => '','container_id' => '','menu_class' => 'menu','menu_id' => '','echo' => true,'fallback_cb' => 'wp_page_menu','before' => '','after' => '','link_before' => '','link_after' => '','items_wrap' => ' ','depth' => 0,'walker' => ''
);
wp_nav_menu( $defaults );
?>我们要修改的是walker参数。 1. 切换到主题目录，打开functions.php文件，加入以下代码： attr_title,'divider' ) == 0 && $depth === 1 ) {
$output .= $indent . ' - title,'divider') == 0 && $depth === 1 ) {
$output .= $indent . '
- attr_title,'dropdown-header') == 0 && $depth === 1 ) {
$output .= $indent . '
- classes ) ? array() : (array) $item->classes;
$classes[] = 'menu-item-' . $item->ID;
$class_names = join( ' ',apply_filters( 'nav_menu_css_class',array_filter( $classes ),$args ) );
if ( $args->has_children )
$class_names .= ' dropdown';
if ( in_array( 'current-menu-item',$classes ) )
$class_names .= ' active';
$class_names = $class_names ? ' class="' . esc_attr( $class_names ) . '"' : '';
$id = apply_filters( 'nav_menu_item_id','menu-item-'. $item->ID,$args );
$id = $id ? ' id="' . esc_attr( $id ) . '"' : '';
$output .= $indent . '';
$atts = array();
$atts['title'] = ! empty( $item->title ) ? $item->title : '';
$atts['target'] = ! empty( $item->target ) ? $item->target : '';
$atts['rel'] = ! empty( $item->xfn ) ? $item->xfn : '';
// If item has_children add atts to a.
if ( $args->has_children && $depth === 0 ) {
$atts['href'] = '#';
$atts['data-toggle'] = 'dropdown';
$atts['class'] = 'dropdown-toggle';
$atts['aria-haspopup'] = 'true';
} else {
$atts['href'] = ! empty( $item->url ) ? $item->url : '';
}
$atts = apply_filters( 'nav_menu_link_attributes',$atts,$args );
$attributes = '';
foreach ( $atts as $attr => $value ) {
if ( ! empty( $value ) ) {
$value = ( 'href' === $attr ) ? esc_url( $value ) : esc_attr( $value );
$attributes .= ' ' . $attr . '="' . $value . '"';
}
}
$item_output = $args->before;
/*
* Glyphicons
* ===========
* Since the the menu item is NOT a Divider or Header we check the see
* if there is a value in the attr_title property. If the attr_title
* property is NOT null we apply it as the class name for the glyphicon.
*/
if ( ! empty( $item->attr_title ) )
$item_output .= 'attr_title ) . '"> ';
else
$item_output .= '';
$item_output .= $args->link_before . apply_filters( 'the_title',$item->title,$item->ID ) . $args->link_after;
$item_output .= ( $args->has_children && 0 === $depth ) ? ' ' : '';
$item_output .= $args->after;
$output .= apply_filters( 'walker_nav_menu_start_el',$item_output,$depth,$args );
}
}
/**
* Traverse elements to create list from elements.
*
* Display one element if the element doesn't have any children otherwise,* display the element and its children. Will only traverse up to the max
* depth and no ignore elements under that depth.
*
* This method shouldn't be called directly,use the walk() method instead.
*
* @see Walker::start_el()
* @since 2.5.0
*
* @param object $element Data object
* @param array $children_elements List of elements to continue traversing.
* @param int $max_depth Max depth to traverse.
* @param int $depth Depth of current element.
* @param array $args
* @param string $output Passed by reference. Used to append additional content.
* @return null Null on failure with no changes to parameters.
*/
public function display_element( $element,&$children_elements,$max_depth,$args,&$output ) {
if ( ! $element )
return;
$id_field = $this->db_fields['id'];
// Display this element.
if ( is_object( $args[0] ) )
$args[0]->has_children = ! empty( $children_elements[ $element->$id_field ] );
parent::display_element( $element,$children_elements,$output );
}
/**
* Menu Fallback
* =============
* If this function is assigned to the wp_nav_menu's fallback_cb variable
* and a manu has not been assigned to the theme location in the WordPress
* menu manager the function with display nothing to a non-logged in user,* and will add a link to the WordPress menu manager if logged in as an admin.
*
* @param array $args passed from the wp_nav_menu function.
*
*/
public static function fallback( $args ) {
if ( current_user_can( 'manage_options' ) ) {
extract( $args );
$fb_output = null;
if ( $container ) {
$fb_output = '<' . $container;
if ( $container_id )
$fb_output .= ' id="' . $container_id . '"';
if ( $container_class )
$fb_output .= ' class="' . $container_class . '"';
$fb_output .= '>';
}
$fb_output .= '';
echo $fb_output;
}
}
}
2. 在需要的地方（header.php文件中）通过如下代码输出导航栏菜单： （编辑：安卓应用网）
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