js实现带菜单栏目搜索的下拉菜单

在下拉菜单栏目比较多的时候，用户查找栏目阅读会很麻烦，为了提高用户体验度，加个栏目搜索会很方便。这篇文章主要介绍了js实现带菜单栏目搜索的下拉菜单,感觉挺实用的,需要的朋友可以参考下

js实现带搜索的下拉菜单 — 基础 HTML 代码

<div class="dropdown">
 <button onclick="myFunction()" class="dropbtn">下拉菜单</button>
 <div id="myDropdown" class="dropdown-content">
 <input type="text" placeholder="Search.." id="myInput" onkeyup="filterFunction()">
 <a href="#about" rel="external nofollow" >Google</a>
 <a href="#base" rel="external nofollow" >Runoob</a>
 <a href="#blog" rel="external nofollow" >Taobao</a>
 <a href="#contact" rel="external nofollow" >Wiki</a>
 <a href="#custom" rel="external nofollow" >Zhihu</a>
 <a href="#support" rel="external nofollow" >Tmall</a>
 <a href="#tools" rel="external nofollow" >Weibo</a>
 </div>
</div>

js实现带搜索的下拉菜单 — 菜单的样式：

/* 下拉菜单按钮 */
.dropbtn {
 background-color: #04AA6D;
 color: white;
 padding: 16px;
 font-size: 16px;
 border: none;
 cursor: pointer;
}
 
/* 鼠标移动到下拉菜单按钮到样式*/
.dropbtn:hover, .dropbtn:focus {
 background-color: #3e8e41;
}
 
/* 搜索框 */
#myInput {
 box-sizing: border-box;
 background-image: url('searchicon.png');
 background-position: 14px 12px;
 background-repeat: no-repeat;
 font-size: 16px;
 padding: 14px 20px 12px 45px;
 border: none;
 border-bottom: 1px solid #ddd;
}
 
/* 搜索框获取焦点的样式 */
#myInput:focus {outline: 3px solid #ddd;}
 
/* 容器 <div> - 定位下拉菜单 */
.dropdown {
 position: relative;
 display: inline-block;
}
 
/* 下拉菜单内容 (默认隐藏) */
.dropdown-content {
 display: none;
 position: absolute;
 background-color: #f6f6f6;
 min-width: 230px;
 border: 1px solid #ddd;
 z-index: 1;
}
 
/* 下拉菜单链接样式 */
.dropdown-content a {
 color: black;
 padding: 12px 16px;
 text-decoration: none;
 display: block;
}
 
/* 鼠标移动到链接上的样式 */
.dropdown-content a:hover {background-color: #f1f1f1}
 
/* 显示下拉菜单 (使用 JS 添加 .dropdown-content 类) */
.show {display:block;}

js实现带搜索的下拉菜单 — JavaScript 代码：

/* 点击按钮设置下拉菜单的显示与隐藏 */
function myFunction() {
 document.getElementById("myDropdown").classList.toggle("show");
}
 
/* 搜索功能 */
function filterFunction() {
 var input, filter, ul, li, a, i;
 input = document.getElementById("myInput");
 filter = input.value.toUpperCase();
 div = document.getElementById("myDropdown");
 a = div.getElementsByTagName("a");
 for (i = 0; i < a.length; i++) {
 txtValue = a[i].textContent || a[i].innerText;
 if (txtValue.toUpperCase().indexOf(filter) > -1) {
 a[i].style.display = "";
 } else {
 a[i].style.display = "none";
 }
 }
}