最近tennfy在用Bootstrap重写博客主题,由于之前没有用过Bootstrap,所以也是花了不少功夫来了解Bootstrap。Bootstrap提供了很完整的css样式布局,对于有一定前端基础的人来说真的非常方便。
利用Bootstrap做wordpress主题遇到的第一个问题就是输出Bootstrap导航栏结构的菜单,这样才能够利用Bootstrap提供的样式进行菜单的显示。本文就来介绍下如何实现wordpress输出Bootstrap的菜单结构。
Bootstrap导航栏结构
常见的Bootstrap导航栏为如下形式:
defaultnavbar_demo
其HTML结构为:
自定义wp_nav_menu函数
熟悉wordpress的朋友都知道,wordpress一般采用wp_nav_menu函数输出菜单,而通过该函数输出的菜单是得不到上述的html结构的。不过值得高兴的是,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:
$defaults = array(
"theme_location" => "",
"menu" => "",
"container" => "div",
"container_class" => "",
"container_id" => "",
"menu_class" => "menu",
"menu_id" => "",
"echo" => true,
"fallback_cb" => "wp_page_menu",
"before" => "",
"after" => "",
"link_before" => "",
"link_after" => "",
"items_wrap" => "
- %3$s",
- ";
} else if ( strcasecmp( $item->title, "divider") == 0 && $depth === 1 ) {
$output .= $indent . " - ";
} else if ( strcasecmp( $item->attr_title, "dropdown-header") == 0 && $depth === 1 ) {
$output .= $indent . " - " . esc_attr( $item->title );
} else if ( strcasecmp($item->attr_title, "disabled" ) == 0 ) {
$output .= $indent . " - " . esc_attr( $item->title ) . "";
} else {
$class_names = $value = "";
$classes = empty( $item->classes ) ? array() : (array) $item->classes;
$classes[] = "menu-item-" . $item->ID;
$class_names = join( " ", apply_filters( "nav_menu_css_class", array_filter( $classes ), $item, $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, $item, $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, $item, $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, $item, $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, $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, $max_depth, $depth, $args, $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 .= "
if ( $menu_id )
$fb_output .= " id="" . $menu_id . """;
if ( $menu_class )
$fb_output .= " class="" . $menu_class . """;
$fb_output .= ">";
$fb_output .= "Add a menu";
$fb_output .= "";
if ( $container )
$fb_output .= "" . $container . ">";
echo $fb_output;
}
}
}[wordpress主题]WordPress输出Bootstrap导航栏结构的菜单例子
http://m.bbyears.com/css/94557.html
推荐访问:wordpress教程 wordpress大学
"depth" => 0,
"walker" => ""
);
wp_nav_menu( $defaults );
?>
其中,我们需要修改的就是walker参数。
输出Bootstrap导航栏结构菜单
在header.php中,通过如下代码输出导航栏菜单:
上面代码中walker参数的值是一个类,所以接下来你需要添加这个类,在主题的functions.php文件中添加下面代码:
/**
* Class Name: wp_bootstrap_navwalker
* GitHub URI: https://github.com/twittem/wp-bootstrap-navwalker
* Description: A custom WordPress nav walker class to implement the Bootstrap 3 navigation style in a custom theme using the WordPress built in menu manager.
* Version: 2.0.4
* Author: Edward McIntyre - @twittem
* License: GPL-2.0+
* License URI: http://www.gnu.org/licenses/gpl-2.0.txt
*/
class wp_bootstrap_navwalker extends Walker_Nav_Menu {
/**
* @see Walker::start_lvl()
* @since 3.0.0
*
* @param string $output Passed by reference. Used to append additional content.
* @param int $depth Depth of page. Used for padding.
*/
public function start_lvl( &$output, $depth = 0, $args = array() ) {
$indent = str_repeat( "\t", $depth );
$output .= "\n$indent
- \n";
}
/**
* @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 int $current_page Menu item ID.
* @param object $args
*/
public function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
$indent = ( $depth ) ? str_repeat( "\t", $depth ) : "";
/**
* Dividers, Headers or Disabled
* =============================
* Determine whether the item is a Divider, Header, Disabled or regular
* menu item. To prevent errors we use the strcasecmp() function to so a
* comparison that is not case sensitive. The strcasecmp() function returns
* a 0 if the strings are equal.
*/
if ( strcasecmp( $item->attr_title, "divider" ) == 0 && $depth === 1 ) {
$output .= $indent . "