如何将自定义 HTML 添加到 wp_nav_menu?

问题描述

我熟悉 WordPress 并使用 WordPress 菜单系统.但我正在寻找一种将自定义 HTML 添加到 wp_nav_menu() 的方法.

I'm familiar with WordPress and using the WordPress menu system. But I'm looking for a way to add custom HTML to wp_nav_menu().

我正在尝试创建这样的菜单:

I'm trying to create a menu like this:

请注意产品下的下拉菜单如何包含图像和链接.我想重新创建这个.我看过一些插件，但更愿意编写代码.

Notice how the drop down menu under products contains an image and a link. I'd like to re-create this. I've looked at a few plugins, but would rather code it.

我不介意对图片和链接进行硬编码，但我希望保持使用 WordPress 管理菜单的灵活性.

I don't mind hard coding the image and link, but I'd like to keep the flexibility of using WordPress to manage the menus.

推荐答案

WordPress 通过菜单页面显示项目的方式是使用 walker 对象.在这种情况下，此对象的特定类称为 Walker_Nav_Menu.您可以在 wp-includes\nav-menu-template.php 中找到它.

The way WordPress goes through the menu pages to display the items, is using a walker object. In this case the specific class for this object is called Walker_Nav_Menu. You can find it in wp-includes\nav-menu-template.php.

Walker_Nav_Menu 是一个非常简单的类.您可以看到链接和菜单结构是如何在那里构建的.函数 start_el 和 end_el 用于构建菜单项.函数 start_lvl 和 end_lvl 用于嵌套菜单.在这种方法中，我们将主要使用 start_el 和 end_el.

The Walker_Nav_Menu is a pretty simple class. You are able to see, how the links and the menu structure are built there. The functions start_el and end_el are used to build the menu-items. Functions start_lvl and end_lvl are for nesting menus. In this approach we'll be mainly using start_el and end_el.

在您的 functions.php 中创建一个类，使用与父类非常相似的方法扩展 Walker_Nav_Menu:

In your functions.php create a class, to extend Walker_Nav_Menu with pretty similar methods to the parent class:

class Custom_Walker_Nav_Menu extends Walker_Nav_Menu {
  function start_el ( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
    // Copy all the start_el code from source, and modify
  }

  function end_el( &$output, $item, $depth = 0, $args = array() ) {
    // Copy all the end_el code from source, and modify
  }
}

在这些函数中，$item 是您的菜单项，如果您愿意，您可以使用它根据当前菜单项查询其他内容.请注意，我没有包含 start_lvl 和 end_lvl，但这并不重要，因为您的类将自动继承父类方法，如果没有被覆盖.

In those functions, the $item is your menu-item, with which you can query additional contents according to the current menu-item, if you want to. Note that I didn't include start_lvl and end_lvl, but that doesn't matter, since your class will automatically inherit the parent classes methods, if not overwritten.

然后，在您的主题文件中，您可以像这样调用 wp_nav_menu:

Then, in your theme files, you can call wp_nav_menu like this:

wp_nav_menu(array(
  'theme_location' => 'main',
  'container' => false,
  'menu_id' => 'nav',
  'depth' => 1,
  // This one is the important part:
  'walker' => new Custom_Walker_Nav_Menu
));

WordPress 将使用您自定义的类和函数，以便您可以修改输出的代码.

WordPress will use your custom class and functions, so that you can modify what code is output.

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