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

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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