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Question

我是网络开发的初学者，我正在尝试了解如何使用 bs4navwalker 在我的导航栏菜单中添加固定顶部 class CSS，只有当我在首页时

当我在主页时，我应该有：

<nav class="navbar fixed-top navbar-expand-md navbar-dark bg-primary">

在其他页面中：

<nav class="navbar navbar-expand-md navbar-dark bg-primary">

你能帮帮我吗？

Answer 1

    <?php
//Before wallker add this
    if (is_home() || is_front_page()) {
      $navBarClasses = 'navbar fixed-top navbar-expand-md navbar-dark bg-primary';
    } else {
      $navBarClasses = 'navbar navbar-expand-md navbar-dark bg-primary';
    }
//Insert variable $navBarClasses in walker param 'menu_class' =>
    wp_nav_menu([
         'menu'            => 'top',
         'theme_location'  => 'top',
         'container'       => 'div',
         'container_id'    => 'bs4navbar',
         'container_class' => 'collapse navbar-collapse',
         'menu_id'         => false,
         'menu_class'      => $navBarClasses,
         'depth'           => 2,
         'fallback_cb'     => 'bs4navwalker::fallback',
         'walker'          => new bs4navwalker()
       ]);
    ?>

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