關於可點擊的下拉菜單
[英]About clickable dropdown menu
問題描述
我點擊此鏈接嘗試創建可點擊的下拉菜單。
我注意到鏈接中的代碼用於一個下拉菜單，我認為該代碼用於創建下拉菜單。
<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>
我嘗試創建另外兩個下拉菜單，所以我將上面的代碼復制了兩次
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>
我沒有在標簽和標簽內進行任何編輯，因此我單擊“在鏈接上運行”以查看結果。
只有第一個下拉菜單（原始菜單）可以顯示菜單，其他兩個下拉菜單則不顯示任何內容。
我想原因是第二個下拉菜單和第三個下拉菜單在and標記內沒有適當的內容。 因此，我開始修改和標記中的代碼。
這是我為第二個下拉菜單和第三個下拉菜單添加的完整代碼。
<!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>
當我運行代碼時，單擊所有按鈕都可以打開下拉菜單。 但是，當我在下拉菜單之外單擊時，只有第三個按鈕可以關閉下拉菜單，而第一個和第二個按鈕仍會打開下拉菜單。
這是我的問題。
- 復制另外兩套代碼以創建另外兩個下拉菜單似乎不是一個好習慣，因為代碼會變得混亂，不利於調試，即使有更新，我也會多次更改代碼。
但是，如果不復制另外兩組代碼，則另外兩個下拉菜單將不起作用。
- 即使我復制了另外兩套代碼來創建另外兩個下拉菜單，我也不理解當鼠標從菜單中單擊時下拉菜單不會關閉。
請感謝您的建議。 謝謝。
1 個解決方案
解決方案1
0 已采納 2017-05-09 08:19:25
您將覆蓋window.onclick事件函數的三倍。 僅啟動最后一個功能。 如果將三個功能合而為一，則可以使用。
現在的代碼：
<!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>
導航下拉菜單不可點擊
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