Web Front-endCSS TutorialSteps to implement the drop-down tab menu effect of a responsive navigation bar using pure CSSSteps to implement the drop-down tab menu effect of a responsive navigation bar using pure CSS
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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