css hidden menu

CSS hidden menu is a commonly used web design technique. It can hide the menu bar through CSS styles to achieve a more concise and beautiful page effect. In this article, we will introduce the implementation principles, steps and common applications of CSS hidden menus.

1. The implementation principle of CSS hidden menu

The implementation principle of CSS hidden menu is to set the "visibility" or "display" attribute on the menu element by using CSS style to make the menu bar in Invisible or invisible in web pages. In this way, when the user needs to expand the menu, he or she can use the mouse hover or click event to make the menu bar appear according to the set CSS effect, thereby achieving the effect of hiding the menu.

2. Steps to implement CSS hidden menu

1. Write HTML code

To define the structure of the menu area in the HTML document, you can use an unordered list Element (

) and list item element (
• ) define menu items as follows:

  <ul class="menu">
    <li><a href="#">菜单项1</a></li>
    <li><a href="#">菜单项2</a></li>
    <li><a href="#">菜单项3</a></li>
    <li><a href="#">菜单项4</a></li>
  </ul>

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  2. Add CSS styles for the menu

  is To set the CSS style of the menu area, you can use the "visibility" or "display" attributes to hide the menu bar. Take the "visibility" attribute as an example to set the default and hover states of the menu area respectively:

  .menu {
    visibility: hidden;  /* 默认css hidden menu */
  }
  
  .menu:hover {
    visibility: visible;  /* 鼠标悬停显示菜单 */
  }

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  3. Perfect menu effect

  In order to achieve a better user experience, it is necessary to improve the effect of CSS hidden menu, such as adding menu animation, changing the background color of menu items, etc. The following is a set of sample codes:

  /* 当鼠标悬停在菜单上时，显示下拉动画 */
  .menu:hover > li {
    opacity: 0;
    transform: translateY(-20px);
    transition: all 0.3s ease;
  }
  
  .menu:hover > li:nth-child(1) {
    transition-delay: 0.1s;
  }
  
  .menu:hover > li:nth-child(2) {
    transition-delay: 0.2s;
  }
  
  .menu:hover > li:nth-child(3) {
    transition-delay: 0.3s;
  }
  
  .menu:hover > li:nth-child(4) {
    transition-delay: 0.4s;
  }
  
  /* 改变菜单项的背景色 */
  .menu > li:hover {
    background-color: #eee;
  }

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  3. Common applications

  1. Suitable for responsive design

  In mobile devices such as mobile phones and tablets, It is often necessary to use hidden menus to save space and improve user experience, as shown in the following figure:

  

  2. Suitable for page overflow problems

  Sometimes, there are too many or too long menu bars in a web page, which will affect the entire page layout. At this time, using CSS to hide the menu can solve the problem of page overflow, as shown in the following figure:

  

  3. Suitable for navigation bars or drop-down menus

  The navigation bar or drop-down menu bar of a website often requires multiple menu options. At this time, using hidden menus can simplify the page and improve user-friendliness. , as shown in the figure below:

  

  4. Summary

  CSS hidden menu is a common web design technique, which uses CSS styles to modify the menu bar. The control of hiding and showing can achieve a simpler and more beautiful web page, and is suitable for responsive design, page overflow problems, navigation bars and other scenarios. I hope that the introduction of this article can help readers better understand the implementation principles and application methods of CSS hidden menus, thereby improving the level and creativity of web design.

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