How to use HTML, CSS and jQuery to implement advanced functions of unlimited levels of vertical menus

How to use HTML, CSS and jQuery to implement the advanced functions of unlimited levels of vertical menu

In modern web design, vertical menu is a common navigation element. The realization of unlimited levels of vertical menu is one of the important functions to improve user experience. This article explains how to implement this advanced functionality using HTML, CSS, and jQuery, and provides specific code examples.

1. HTML structure

First, we need to create a basic HTML structure to accommodate the vertical menu. Here is a simple example:

<ul id="menu">
  <li><a href="#">菜单项一</a></li>
  <li><a href="#">菜单项二</a>
    <ul>
      <li><a href="#">子菜单项一</a></li>
      <li><a href="#">子菜单项二</a></li>
      <li><a href="#">子菜单项三</a></li>
      <li><a href="#">子菜单项四</a>
        <ul>
          <li><a href="#">子子菜单项一</a></li>
          <li><a href="#">子子菜单项二</a></li>
        </ul>
      </li>
    </ul>
  </li>
  <li><a href="#">菜单项三</a></li>
  <li><a href="#">菜单项四</a></li>
</ul>

In this example, we have used an unordered list ul to create the menu. Each menu item contains a link <a href="#">, and possibly subordinate menus.

2. CSS Style

Next, we need to use CSS to add styles to the menu items. Here are some basic styles to set the appearance of the menu:

#menu {
  list-style-type: none;
  padding: 0;
  margin: 0;
}

#menu li {
  position: relative;
}

#menu li ul {
  position: absolute;
  display: none;
}

#menu li:hover > ul {
  display: block;
  left: 100%;
  top: 0;
}

In this example, we use position: relative to set the relative positioning of the menu items. The lower-level menu ul sets the display attribute to none to hide it. Use display: block to display lower-level menus when the mouse is hovering over a menu item.

3. jQuery function

Finally, we need to use jQuery to realize the advanced function of the menu, that is, the infinite level drop-down menu. Here is some sample code:

$(document).ready(function() {
  $('#menu li').click(function() {
    $(this).children('ul').slideToggle();
  });
});

This code will add a click event to each menu item after the document has loaded. When a menu item is clicked, use the slideToggle() function to switch the display and hiding of the lower-level menu.

Through the above code example, we can implement an infinite-level vertical menu, and each menu item can expand and collapse subordinate menus.

Summary

In this article, we introduced how to use HTML, CSS, and jQuery to implement the advanced functionality of an infinite-level vertical menu. Through reasonable HTML structure, CSS styles and jQuery's dynamic effects, we can create a highly interactive and easy-to-operate navigation menu. Readers can further customize and expand according to their own needs to meet different design requirements.

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