如何防止下拉菜单从用户点击进入时关闭？
我遵循W3Schools网站上关于从按钮制作下拉菜单的教程。 一切工作正常除了当用户点击下拉菜单内的菜单本身消失。
我想在用户点击按钮时创建一个登录按钮，它显示一个下拉菜单，他/她可以输入他/她的用户名和密码，然后单击登录。
如果用户点击下拉菜单之外的任何其他区域，我想保留该功能，它会自动关闭下拉菜单。
我的问题是，当用户点击里面的任何区域的下拉菜单中消失。 如何在使用JavaScript的情况下单击下拉菜单时防止它消失？ 怎么样使用jQuery （我还没有真正熟悉jQuery）
/* 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 menu 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');
}
}
}
}/* Dropdown Button */
.dropbtn {
background-color: #4CAF50;
color: white;
padding: 16px;
font-size: 16px;
border: none;
cursor: pointer;
}
/* Dropdown button on hover & focus */
.dropbtn:hover, .dropbtn:focus {
background-color: #3e8e41;
}
/* The container <div> - needed to position the dropdown content */
.dropdown {
position: relative;
display: inline-block;
}
/* Dropdown Content (Hidden by Default) */
.dropdown-content {
display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
}
/* Contents inside the dropdown */
.dropdown-content input, .dropdown-content button {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
}
/* Change color of dropdown links on hover */
.dropdown-content a:hover {background-color: #f1f1f1}
/* Show the dropdown menu (use JS to add this class to the .dropdown-content container when the user clicks on the dropdown button) */
.show {display:block;}<div class="dropdown">
<button onclick="myFunction()" class="dropbtn">LOG IN</button>
<div id="myDropdown" class="dropdown-content">
<input type="text" name="username" placeholder="Enter username"/>
<input type="text" name="password" placeholder="Enter password"/>
<button type="submit" name="submit">Submit</button>
</div>
</div>在window.onClick处理程序中，我们添加一个条件来排除“下拉内容”及其子项。
/* 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 menu if the user clicks outside of it
window.onclick = function(event) {
if (!event.target.matches('.dropbtn')) {
// [BEGIN][Here is the condition]
if (event.target.matches('.dropdown-content') || event.target.matches('.dropdown-content *') ) {
event.stopPropagation();
return;
}
// [END][Here is the condition]
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');
}
}
}
}/* Dropdown Button */
.dropbtn {
background-color: #4CAF50;
color: white;
padding: 16px;
font-size: 16px;
border: none;
cursor: pointer;
}
/* Dropdown button on hover & focus */
.dropbtn:hover, .dropbtn:focus {
background-color: #3e8e41;
}
/* The container <div> - needed to position the dropdown content */
.dropdown {
position: relative;
display: inline-block;
}
/* Dropdown Content (Hidden by Default) */
.dropdown-content {
display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
}
/* Contents inside the dropdown */
.dropdown-content input, .dropdown-content button {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
}
/* Change color of dropdown links on hover */
.dropdown-content a:hover {background-color: #f1f1f1}
/* Show the dropdown menu (use JS to add this class to the .dropdown-content container when the user clicks on the dropdown button) */
.show {display:block;}<div class="dropdown">
<button onclick="myFunction()" class="dropbtn">LOG IN</button>
<div id="myDropdown" class="dropdown-content">
<input type="text" name="username" placeholder="Enter username"/>
<input type="text" name="password" placeholder="Enter password"/>
<button type="submit" name="submit">Submit</button>
</div>
</div>当你点击内部下拉菜单时，你不应该删除显示类
/* 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 menu if the user clicks outside of it
window.onclick = function(event) {
if (event.target.matches('.dropdown-content *')) {
return;
}
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');
}
}
}
}/* Dropdown Button */
.dropbtn {
background-color: #4CAF50;
color: white;
padding: 16px;
font-size: 16px;
border: none;
cursor: pointer;
}
/* Dropdown button on hover & focus */
.dropbtn:hover, .dropbtn:focus {
background-color: #3e8e41;
}
/* The container <div> - needed to position the dropdown content */
.dropdown {
position: relative;
display: inline-block;
}
/* Dropdown Content (Hidden by Default) */
.dropdown-content {
display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
}
/* Contents inside the dropdown */
.dropdown-content input, .dropdown-content button {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
}
/* Change color of dropdown links on hover */
.dropdown-content a:hover {background-color: #f1f1f1}
/* Show the dropdown menu (use JS to add this class to the .dropdown-content container when the user clicks on the dropdown button) */
.show {display:block;}<div class="dropdown">
<button onclick="myFunction()" class="dropbtn">LOG IN</button>
<div id="myDropdown" class="dropdown-content">
<input type="text" class="form-input" name="username" placeholder="Enter username"/>
<input type="text" class="form-input" name="password" placeholder="Enter password"/>
<button type="submit" name="submit">Submit</button>
</div>
</div>上一篇: How To Prevent Drop Down Menu From Closing When User Clicks Into It?