How to implement an infinite level drop-down menu using HTML, CSS and jQuery

How to use HTML, CSS and jQuery to implement unlimited levels of drop-down menus

With the continuous enrichment of website functions, drop-down menus have become a common interactive element in web design one. In actual development, we often encounter situations where we need to implement multi-level drop-down menus. This article will introduce how to use HTML, CSS and jQuery to implement an infinite level drop-down menu, and give specific code examples.

1. Preparation
Before starting to write code, we need to prepare some basic files, including:

<li>HTML file (index.html): used to build web pages Structure. <li>CSS file (style.css): used to define the style of the web page. <li>jQuery library file: used to achieve interactive effects.

2. HTML structure
The following is a simple HTML structure example for creating a three-level drop-down menu:

<nav>
  <ul>
    <li>
       <a href="#">菜单1</a>
       <ul>
          <li>
             <a href="#">子菜单1</a>
             <ul>
                <li><a href="#">子菜单1-1</a></li>
                <li><a href="#">子菜单1-2</a></li>
             </ul>
          </li>
          <li><a href="#">子菜单2</a></li>
       </ul>
    </li>
    <li><a href="#">菜单2</a></li>
    <li><a href="#">菜单3</a></li>
  </ul>
</nav>

In this example, we use None Sequence lists<ul></ul> and list items<li> are used to organize the structure of the menu, and anchor points<a></a> are used to create menu items.

3. CSS Style
The following is a simple CSS style example to beautify the appearance of the drop-down menu:

nav ul {
  list-style: none;
  padding-left: 0;
  background: #f0f0f0;
}

nav ul ul {
  display: none;
}

nav ul li:hover > ul {
  display: block;
}

nav ul li {
  display: inline-block;
  position: relative;
}

nav ul li a {
  display: block;
  padding: 10px 20px;
  text-decoration: none;
  color: #333;
}

nav ul ul {
  position: absolute;
  top: 100%;
  left: 0;
}

In this example, we use CSS styles to set the menu Appearance, including background color, spacing between list items, styles on mouseover, etc.

4. jQuery implementation
The following is a simple jQuery code example to achieve an infinite level drop-down menu effect:

$(document).ready(function() {
  $('nav ul ul').hide();
  $('nav ul li').hover(function() {
    $(this).children('ul').stop().slideDown(200);
  }, function() {
    $(this).children('ul').stop().slideUp(200);
  });
});

In this example, we use jQueryhover() method to monitor the mouse hover event of the menu. When the mouse hovers over the menu item, the submenu will expand in a sliding manner; when the mouse leaves the menu item, the submenu will expand in a sliding manner. Slide to retract.

5. Result Display
Integrate the above HTML, CSS and jQuery codes together, save and run the web page, and we will see a drop-down menu that can be infinitely expanded. When the mouse hovers over the menu item, the submenu will expand in a sliding manner; when the mouse leaves the menu item, the submenu will collapse in a sliding manner.

Summary
This article introduces how to use HTML, CSS and jQuery to implement an infinite level drop-down menu. Through the definition of reasonable HTML structure and CSS styles, as well as using jQuery's event listening and animation effects, we can easily implement a drop-down menu that can dynamically expand and collapse. I hope this article helps you understand and use unlimited levels of drop-down menus!

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