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Steps to implement the drop-down tab menu effect of a responsive navigation bar using pure CSS

WBOYOriginal: 2023-10-28 09:58:491682browse

Pure CSS steps to implement the drop-down tab menu effect of the responsive navigation bar

The navigation bar is one of the common elements in web pages, and the drop-down tab menu It is an effect often used in navigation bars and can provide more navigation options. This article will introduce how to use pure CSS to implement a responsive navigation bar drop-down tab menu effect.

Step 1: Build a basic HTML structure

We first need to build a basic HTML structure for demonstration and add some styles to the navigation bar. The following is a simple HTML structure:

<!DOCTYPE html>
<html>
  <head>
    <title>响应式导航栏</title>
    <style>
      /* 导航栏样式 */
      .navbar {
        background-color: #333;
        overflow: hidden;
      }
      
      /* 导航栏选项样式 */
      .navbar a {
        float: left;
        color: #fff;
        text-align: center;
        padding: 14px 16px;
        text-decoration: none;
      }
      
      /* 导航栏选项悬停样式 */
      .navbar a:hover {
        background-color: #ddd;
        color: #333;
      }
    </style>
  </head>
  <body>
    <div class="navbar">
      <a href="#">首页</a>
      <a href="#">新闻</a>
      <a href="#">图片</a>
      <a href="#">视频</a>
      <a href="#">论坛</a>
      <a href="#">联系我们</a>
      <a href="javascript:void(0);" class="icon" onclick="responsiveMenu()">
        <i class="fa fa-bars"></i>
      </a>
    </div>
  </body>
</html>

Step 2: Add CSS styles

Next, we need to add some CSS styles to achieve the effect of a responsive navigation bar. We can use media queries to define styles for different screen sizes. The following is an example CSS style:

/* 全局样式 */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* 导航栏选项隐藏样式 */
.navbar a:not(:first-child) {
  display: none;
}

/* 响应式导航栏样式 */
@media screen and (max-width: 600px) {
  .navbar a:not(:first-child) {
    display: none;
  }
  
  /* 显示导航栏选项 */
  .navbar a.icon {
    float: right;
    display: block;
  }
  
  /* 导航栏选项悬停样式 */
  .navbar.responsive a.icon {
    background-color: #ddd;
    color: #333;
  }
  
  /* 导航栏选项悬停后的下拉菜单样式 */
  .navbar.responsive .navbar-dropdown {
    display: block;
  }
  
  /* 导航栏下拉菜单样式 */
  .navbar-dropdown {
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    min-width: 160px;
    z-index: 1;
  }
  
  /* 导航栏下拉菜单选项样式 */
  .navbar-dropdown a {
    color: #000;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
  }
  
  /* 导航栏下拉菜单选项悬停样式 */
  .navbar-dropdown a:hover {
    background-color: #f1f1f1;
  }
}

Step 3: Add JavaScript code

In realizing the effect of the responsive navigation bar, we also need to use JavaScript to control the expansion and collapse of the menu. The following is a simple JavaScript code example:

/* 响应式导航栏菜单展开与收起的函数 */
function responsiveMenu() {
  var x = document.getElementById("myTopnav");
  if (x.className === "navbar") {
    x.className += " responsive";
  } else {
    x.className = "navbar";
  }
}

Step 4: Add drop-down menu content

Finally, we need to add the content of the drop-down menu to the navigation bar. This part of the content will be placed in a <div> tag, and the <code>.navbar-dropdown class will be used for style control. Here is an example:

<div class="navbar-dropdown">
  <a href="#">音乐</a>
  <a href="#">游戏</a>
  <a href="#">电影</a>
  <a href="#">书籍</a>
</div>

In summary, through the above four steps, we can achieve a simple pure CSS responsive navigation bar drop-down tab menu effect. Using media queries and JavaScript, we can display and hide content in different screen sizes to provide users with a better experience.

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