在我的导航栏中，第一个按钮可以工作，但下一个按钮不起作用。后续按钮仅调用第一个按钮。我还想让我的导航响应汉堡包图标。我无法感知可能的解决方案。我知道 Javascript 仅调用第一个按钮，我想Javascript按类调用后续按钮。我不知道如何解决这个问题。我浏览的一些解决方案，只有按钮，但我希望按钮在导航栏中可单击。和其他一些解决方案，在导航栏上有下拉菜单，但单击菜单本身时它们不会关闭，但在窗口中单击时会关闭
2 回答
Helenr
TA贡献1780条经验 获得超3个赞
注1：删除重复的ID。多个元素切勿具有相同的 ID。
注2：使用 时document.getElementById("myDropdown")，只会返回一个元素（&第一个元素）。
注3：我们可以使用类来代替“ID”。请检查下面的javascript代码以显示相应的下拉列表。
//JS
function myFunction(event) {
var clickedElement = event.target;
console.log(clickedElement);
if (clickedElement.nodeName != 'BUTTON') {
clickedElement = clickedElement.parentElement;
}
var dropdownElement = clickedElement.nextElementSibling;
dropdownElement.classList.add('tempClass'); //adding tempclass to avoid this in below loop
var allOtherDropdowns = document.getElementsByClassName('dropdown-content');
//close all other dropdowns
for (var i = 0; i < allOtherDropdowns.length; i++) {
if (!allOtherDropdowns[i].classList.contains('tempClass')) {
allOtherDropdowns[i].classList.remove('show');
}
}
dropdownElement.classList.toggle("show");
dropdownElement.classList.remove('tempClass'); //removing the temp class here
}
//HTML
<div class="dropdown">
<button class="dropbtn" onclick="myFunction(event)">Upgrade 2
<i class="fa fa-caret-down"></i>
</button>
<div class="dropdown-content">
<a href="#" onclick="myFunc();">item 1</a>
<a href="#">item 2</a>
<a href="#">item 3</a>
</div>
</div>
function myFunc() {
alert('You clicked a submenu item')
}
/* When the user clicks on the button,
toggle between hiding and showing the dropdown content */
function myFunction(event) {
var clickedElement = event.target;
console.log(clickedElement);
if (clickedElement.nodeName != 'BUTTON') {
clickedElement = clickedElement.parentElement;
}
var dropdownElement = clickedElement.nextElementSibling;
dropdownElement.classList.add('tempClass'); //adding tempclass to avoid this in below loop
var allOtherDropdowns = document.getElementsByClassName('dropdown-content');
//close all other dropdowns
for (var i = 0; i < allOtherDropdowns.length; i++) {
if (!allOtherDropdowns[i].classList.contains('tempClass')) {
allOtherDropdowns[i].classList.remove('show');
}
}
dropdownElement.classList.toggle("show");
dropdownElement.classList.remove('tempClass'); //removing the temp class here
}
// Close the dropdown if the user clicks outside of it
window.onclick = function(e) {
if (!e.target.matches('.dropbtn')) {
var allDropdowns = document.getElementsByClassName('dropdown-content');
//close all other dropdowns
for (var i = 0; i < allDropdowns.length; i++) {
allDropdowns[i].classList.remove('show');
}
}
}
.navbar {
overflow: hidden;
background-color: #333;
font-family: Arial, Helvetica, sans-serif;
}
.navbar a {
float: left;
font-size: 16px;
color: white;
text-align: center;
padding: 14px 16px;
text-decoration: none;
}
.dropdown {
float: left;
overflow: hidden;
}
.dropdown .dropbtn {
cursor: pointer;
font-size: 16px;
border: none;
outline: none;
color: white;
padding: 14px 16px;
background-color: inherit;
font-family: inherit;
margin: 0;
}
.navbar a:hover,
.dropdown:hover .dropbtn,
.dropbtn:focus {
background-color: red;
}
.dropdown-content {
display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
z-index: 1;
}
.dropdown-content a {
float: none;
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
text-align: left;
}
.dropdown-content a:hover {
background-color: #ddd;
}
.show {
display: block;
}
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
</head>
<body>
<div class="navbar">
<div class="dropdown">
<button class="dropbtn" onclick="myFunction(event)">Upgrade 1
<i class="fa fa-caret-down"></i>
</button>
<div class="dropdown-content">
<a href="#" onclick="myFunc();">item 1</a>
<a href="#">item 2</a>
<a href="#">item 3</a>
</div>
</div>
<div class="dropdown">
<button class="dropbtn" onclick="myFunction(event)">Upgrade 2
<i class="fa fa-caret-down"></i>
</button>
<div class="dropdown-content">
<a href="#" onclick="myFunc();">item 1</a>
<a href="#">item 2</a>
<a href="#">item 3</a>
</div>
</div>
<div class="dropdown">
<button class="dropbtn" onclick="myFunction(event)">Upgrade 3
<i class="fa fa-caret-down"></i>
</button>
<div class="dropdown-content">
<a href="#" onclick="myFunc();">item 1</a>
<a href="#">item 2</a>
<a href="#">item 3</a>
</div>
</div>
</div>
<h3>Dropdown Menu inside a Navigation Bar</h3>
<p>Click on the "Dropdown" link to see the dropdown menu.</p>
</body>
</html>
qq_遁去的一_1
TA贡献1725条经验 获得超7个赞
function myFunction() {
document.getElementById("myDropdown").classList.toggle("show");
document.getElementById("myDropdown1").classList.remove("show");
document.getElementById("myDropdown2").classList.remove("show");
}
function myFunction1() {
document.getElementById("myDropdown1").classList.toggle("show");
document.getElementById("myDropdown").classList.remove("show");
document.getElementById("myDropdown2").classList.remove("show");
}
function myFunction2() {
document.getElementById("myDropdown2").classList.toggle("show");
document.getElementById("myDropdown1").classList.remove("show");
document.getElementById("myDropdown").classList.remove("show");
}
// Close the dropdown if the user clicks outside of it
window.onclick = function(e) {
if (!e.target.matches('.dropbtn')) {
var myDropdown = document.getElementById("myDropdown");
var myDropdown1 = document.getElementById("myDropdown1");
var myDropdown2 = document.getElementById("myDropdown2");
if (myDropdown.classList.contains('show')) {
myDropdown.classList.remove('show');
}
if (myDropdown1.classList.contains('show')) {
myDropdown1.classList.remove('show');
}
if (myDropdown2.classList.contains('show')) {
myDropdown2.classList.remove('show');
}
}
}
我认为相同的 Id 是问题所在
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