wordpress制作符合Bootstrap的导航栏菜单(带二级菜单)
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新手学做网站时使用wordpress程序做网站,它有一个很棒的功能,就是在后台创建导航菜单,在后台我们可以任意的拖动导航栏目。wordpress程序结合Bootstrap框架,就可以制作出一个响应式的动态网站。并且可以自动调用后台的导航栏目。
前面的课程,我们讲到了bootstrap响应式导航如何制作,给出了静态的响应式导航制作方法。那么如何让wordpress制作符合Bootstrap的导航栏菜单呢?
wordpress制作符合Bootstrap的导航栏菜单分为二种:
一种是:只需要一级导航,不带二级菜单。
代码如下:
<nav class="navbar navbar-default">
<div class="container-fluid">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="https://www.xuewangzhan.net/">学做网站论坛</a>
</div>
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav">
<?php if(function_exists('wp_nav_menu')) wp_nav_menu(array('theme_location' =>'topmenu','container' => false, 'items_wrap' => '%3$s','depth' => 1 )); ?>
</ul>
</div><!-- /.navbar-collapse -->
</div><!-- /.container-fluid -->
</nav>
另一种:输出带有下拉二级菜单导航。
WordPress一般采用wp_nav_menu函数输出导航栏菜单,默认输出的导航菜单是不符合Bootstrap下拉菜单的,如果我们想输出带有下拉二级菜单导航,需要我们通过模板函数进行自定义输出html结构。
方法如下:
- 打开自己模板模板函数functions.php,加入以下代码:(如果报错,替换这一句: $output .= "\n$indent<ul role=\"menu\" class=\" dropdown-menu\">\n"; )
//添加菜单功能
if ( function_exists('register_nav_menus')) {register_nav_menus(array('topmenu' => ' 顶部菜单'));}
/*定义bootstrap二级菜单导航
*/
class wp_bootstrap_navwalker extends Walker_Nav_Menu {public function start_lvl( &$output, $depth = 0, $args = array() ) {
$indent = str_repeat( "\t", $depth );
$output .= $indent.'<ul role="menu" class=" dropdown-menu">';
}public function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
$indent = ( $depth ) ? str_repeat( "\t", $depth ) : '';if ( strcasecmp( $item->attr_title, 'divider' ) == 0 && $depth === 1 ) {
$output .= $indent . '<li role="presentation" class="divider">';
} else if ( strcasecmp( $item->title, 'divider') == 0 && $depth === 1 ) {
$output .= $indent . '<li role="presentation" class="divider">';
} else if ( strcasecmp( $item->attr_title, 'dropdown-header') == 0 && $depth === 1 ) {
$output .= $indent . '<li role="presentation" class="dropdown-header">' . esc_attr( $item->title );
} else if ( strcasecmp($item->attr_title, 'disabled' ) == 0 ) {
$output .= $indent . '<li role="presentation" class="disabled"><a href="#">' . esc_attr( $item->title ) . '</a>';
} else {$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 . '<li' . $id . $value . $class_names .'>';
$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'] = $item->url;
$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;
if ( ! empty( $item->attr_title ) )
$item_output .= '<a'. $attributes .'><span class="glyphicon ' . esc_attr( $item->attr_title ) . '"></span> ';
else
$item_output .= '<a'. $attributes .'>';
$item_output .= $args->link_before . apply_filters( 'the_title', $item->title, $item->ID ) . $args->link_after;
$item_output .= ( $args->has_children && 0 === $depth ) ? ' <span class="caret"></span></a>' : '</a>';
$item_output .= $args->after;
$output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
}
}
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 );
}
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 .= '<ul';
if ( $menu_id )
$fb_output .= ' id="' . $menu_id . '"';
if ( $menu_class )
$fb_output .= ' class="' . $menu_class . '"';
$fb_output .= '>';
$fb_output .= '<li><a href="' . admin_url( 'nav-menus.php' ) . '">Add a menu</a></li>';
$fb_output .= '</ul>';
if ( $container )
$fb_output .= '</' . $container . '>';
echo $fb_output;
}
}
} - 在网站需要显示导航的地方(header.php文件中)通过如下代码输出带二级菜单导航栏:
<nav class="navbar navbar-default">
<div class="container">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="https://www.xuewangzhan.net/">学做网站论坛</a>
</div> <!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<?php
wp_nav_menu( array(
'theme_location' => 'topmenu',
'depth' => 2,
'container' => false,
'menu_class' => 'nav navbar-nav',
'fallback_cb' => 'wp_page_menu',
//添加或更改walker参数
'walker' => new wp_bootstrap_navwalker())
);
?></div><!-- /.navbar-collapse -->
</div><!-- /.container-fluid -->
</nav> - 通过上面的代码,就可以输出带二级导航的菜单了。但是现在的二级菜单是点击后再出现的,如果想做成鼠标经过时,弹出二级菜单,请参考:bootstrap下拉菜单鼠标悬停弹出