关于可点击的下拉菜单
[英]About clickable dropdown menu
问题描述
我点击此链接尝试创建可点击的下拉菜单。
我注意到链接中的代码用于一个下拉菜单，我认为该代码用于创建下拉菜单。
<div class="dropdown">
<button onclick="myFunction()" class="dropbtn">Dropdown</button>
<div id="myDropdown" class="dropdown-content">
<a href="#home">Home</a>
<a href="#about">About</a>
<a href="#contact">Contact</a>
</div>
</div>
我尝试创建另外两个下拉菜单，所以我将上面的代码复制了两次
2nd dropdown
<div class="dropdown">
<button onclick="myFunction()" class="dropbtn">Dropdown2</button>
<div id="myDropdown" class="dropdown-content">
<a href="#home">Home2</a>
<a href="#about">About2</a>
<a href="#contact">Contact2</a>
</div>
</div>
3rd dropdown
<div class="dropdown">
<button onclick="myFunction()" class="dropbtn">Dropdown3</button>
<div id="myDropdown" class="dropdown-content">
<a href="#home">Home2</a>
<a href="#about">About2</a>
<a href="#contact">Contact2</a>
我没有在标签和标签内进行任何编辑，因此我单击“在链接上运行”以查看结果。
只有第一个下拉菜单（原始菜单）可以显示菜单，其他两个下拉菜单则不显示任何内容。
我想原因是第二个下拉菜单和第三个下拉菜单在and标记内没有适当的内容。 因此，我开始修改和标记中的代码。
这是我为第二个下拉菜单和第三个下拉菜单添加的完整代码。
<!DOCTYPE html>
<html>
<head>
<style>
/*1st dropdown*/
.dropbtn {
background-color: #4CAF50;
color: white;
padding: 16px;
font-size: 16px;
border: none;
cursor: pointer;
}
.dropbtn:hover, .dropbtn:focus {
background-color: #3e8e41;
}
.dropdown {
position: relative;
display: inline-block;
}
.dropdown-content {
display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 160px;
overflow: auto;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
z-index: 1;
}
.dropdown-content a {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
}
.dropdown a:hover {background-color: #f1f1f1}
.show {display:block;}
/*2nd dropdown*/
.dropbtn2 {
background-color: #4CAF50;
color: white;
padding: 16px;
font-size: 16px;
border: none;
cursor: pointer;
}
.dropbtn2:hover, .dropbtn2:focus {
background-color: #3e8e41;
}
.dropdown2 {
position: relative;
display: inline-block;
}
.dropdown-content2 {
display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 160px;
overflow: auto;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
z-index: 1;
}
.dropdown-content2 a {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
}
.dropdown2 a:hover {background-color: #f1f1f1}
.show2 {display:block;}
/*3rd dropdown*/
.dropbtn3 {
background-color: #4CAF50;
color: white;
padding: 16px;
font-size: 16px;
border: none;
cursor: pointer;
}
.dropbtn3:hover, .dropbtn2:focus {
background-color: #3e8e41;
}
.dropdown3 {
position: relative;
display: inline-block;
}
.dropdown-content3 {
display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 160px;
overflow: auto;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
z-index: 1;
}
.dropdown-content3 a {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
}
.dropdown3 a:hover {background-color: #f1f1f1}
.show3 {display:block;}
</style>
</head>
<body>
<h2>Clickable Dropdown</h2>
<p>Click on the button to open the dropdown menu.</p>
1st dropdown
<div class="dropdown">
<button onclick="myFunction()" class="dropbtn">Dropdown</button>
<div id="myDropdown" class="dropdown-content">
<a href="#home">Home</a>
<a href="#about">About</a>
<a href="#contact">Contact</a>
</div>
</div>
2nd dropdown
<div class="dropdown2">
<button onclick="myFunction2()" class="dropbtn2">Dropdown2</button>
<div id="myDropdown2" class="dropdown-content2">
<a href="#home">Home2</a>
<a href="#about">About2</a>
<a href="#contact">Contact2</a>
</div>
</div>
3rd dropdown
<div class="dropdown3">
<button onclick="myFunction3()" class="dropbtn3">Dropdown3</button>
<div id="myDropdown3" class="dropdown-content3">
<a href="#home">Home3</a>
<a href="#about">About3</a>
<a href="#contact">Contact3</a>
</div>
</div>
<script>
/* When the user clicks on the button,
toggle between hiding and showing the dropdown content */
function myFunction() {
document.getElementById("myDropdown").classList.toggle("show");
}
// Close the dropdown if the user clicks outside of it
window.onclick = function(event) {
if (!event.target.matches('.dropbtn')) {
var dropdowns = document.getElementsByClassName("dropdown-content");
var i;
for (i = 0; i < dropdowns.length; i++) {
var openDropdown = dropdowns[i];
if (openDropdown.classList.contains('show')) {
openDropdown.classList.remove('show');
}
}
}
}
//for 2nd dropdown
function myFunction2() {
document.getElementById("myDropdown2").classList.toggle("show2");
}
// Close the dropdown if the user clicks outside of it
window.onclick = function(event) {
if (!event.target.matches('.dropbtn2')) {
var dropdowns = document.getElementsByClassName("dropdown-content2");
var i;
for (i = 0; i < dropdowns.length; i++) {
var openDropdown = dropdowns[i];
if (openDropdown.classList.contains('show2')) {
openDropdown.classList.remove('show2');
}
}
}
}
//for 3rd dropdown
function myFunction3() {
document.getElementById("myDropdown3").classList.toggle("show3");
}
// Close the dropdown if the user clicks outside of it
window.onclick = function(event) {
if (!event.target.matches('.dropbtn3')) {
var dropdowns = document.getElementsByClassName("dropdown-content3");
var i;
for (i = 0; i < dropdowns.length; i++) {
var openDropdown = dropdowns[i];
if (openDropdown.classList.contains('show3')) {
openDropdown.classList.remove('show3');
}
}
}
}
</script>
</body>
</html>
当我运行代码时，单击所有按钮都可以打开下拉菜单。 但是，当我在下拉菜单之外单击时，只有第三个按钮可以关闭下拉菜单，而第一个和第二个按钮仍会打开下拉菜单。
这是我的问题。
- 复制另外两套代码以创建另外两个下拉菜单似乎不是一个好习惯，因为代码会变得混乱，不利于调试，即使有更新，我也会多次更改代码。
但是，如果不复制另外两组代码，则另外两个下拉菜单将不起作用。
- 即使我复制了另外两套代码来创建另外两个下拉菜单，我也不理解当鼠标从菜单中单击时下拉菜单不会关闭。
请感谢您的建议。 谢谢。
1 个解决方案
解决方案1
0 已采纳 2017-05-09 08:19:25
您将覆盖window.onclick事件函数的三倍。 仅启动最后一个功能。 如果将三个功能合而为一，则可以使用。
现在的代码：
<!DOCTYPE html> <html> <head> <style> /*1st dropdown*/ .dropbtn { background-color: #4CAF50; color: white; padding: 16px; font-size: 16px; border: none; cursor: pointer; } .dropbtn:hover, .dropbtn:focus { background-color: #3e8e41; } .dropdown { position: relative; display: inline-block; } .dropdown-content { display: none; position: absolute; background-color: #f9f9f9; min-width: 160px; overflow: auto; box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2); z-index: 1; } .dropdown-content a { color: black; padding: 12px 16px; text-decoration: none; display: block; } .dropdown a:hover {background-color: #f1f1f1} .show {display:block;} /*2nd dropdown*/ .dropbtn2 { background-color: #4CAF50; color: white; padding: 16px; font-size: 16px; border: none; cursor: pointer; } .dropbtn2:hover, .dropbtn2:focus { background-color: #3e8e41; } .dropdown2 { position: relative; display: inline-block; } .dropdown-content2 { display: none; position: absolute; background-color: #f9f9f9; min-width: 160px; overflow: auto; box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2); z-index: 1; } .dropdown-content2 a { color: black; padding: 12px 16px; text-decoration: none; display: block; } .dropdown2 a:hover {background-color: #f1f1f1} .show2 {display:block;} /*3rd dropdown*/ .dropbtn3 { background-color: #4CAF50; color: white; padding: 16px; font-size: 16px; border: none; cursor: pointer; } .dropbtn3:hover, .dropbtn2:focus { background-color: #3e8e41; } .dropdown3 { position: relative; display: inline-block; } .dropdown-content3 { display: none; position: absolute; background-color: #f9f9f9; min-width: 160px; overflow: auto; box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2); z-index: 1; } .dropdown-content3 a { color: black; padding: 12px 16px; text-decoration: none; display: block; } .dropdown3 a:hover {background-color: #f1f1f1} .show3 {display:block;} </style> </head> <body> <h2>Clickable Dropdown</h2> <p>Click on the button to open the dropdown menu.</p> 1st dropdown <div class="dropdown"> <button onclick="myFunction()" class="dropbtn">Dropdown</button> <div id="myDropdown" class="dropdown-content"> <a href="#home">Home</a> <a href="#about">About</a> <a href="#contact">Contact</a> </div> </div> 2nd dropdown <div class="dropdown2"> <button onclick="myFunction2()" class="dropbtn2">Dropdown2</button> <div id="myDropdown2" class="dropdown-content2"> <a href="#home">Home2</a> <a href="#about">About2</a> <a href="#contact">Contact2</a> </div> </div> 3rd dropdown <div class="dropdown3"> <button onclick="myFunction3()" class="dropbtn3">Dropdown3</button> <div id="myDropdown3" class="dropdown-content3"> <a href="#home">Home3</a> <a href="#about">About3</a> <a href="#contact">Contact3</a> </div> </div> <script> /* When the user clicks on the button, toggle between hiding and showing the dropdown content */ function myFunction() { document.getElementById("myDropdown").classList.toggle("show"); } //for 2nd dropdown function myFunction2() { document.getElementById("myDropdown2").classList.toggle("show2"); } //for 3rd dropdown function myFunction3() { document.getElementById("myDropdown3").classList.toggle("show3"); } // Close the dropdown if the user clicks outside of it window.onclick = function(event) { if (!event.target.matches('.dropbtn')) { var dropdowns = document.getElementsByClassName("dropdown-content"); var i; for (i = 0; i < dropdowns.length; i++) { var openDropdown = dropdowns[i]; if (openDropdown.classList.contains('show')) { openDropdown.classList.remove('show'); } } } if (!event.target.matches('.dropbtn2')) { var dropdowns = document.getElementsByClassName("dropdown-content2"); var i; for (i = 0; i < dropdowns.length; i++) { var openDropdown = dropdowns[i]; if (openDropdown.classList.contains('show2')) { openDropdown.classList.remove('show2'); } } } if (!event.target.matches('.dropbtn3')) { var dropdowns = document.getElementsByClassName("dropdown-content3"); var i; for (i = 0; i < dropdowns.length; i++) { var openDropdown = dropdowns[i]; if (openDropdown.classList.contains('show3')) { openDropdown.classList.remove('show3'); } } } } </script> </body> </html>
导航下拉菜单不可点击
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