隐藏/显示菜单 onclick javascript
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Hide/show menu onclick javascript
提问by pythonious
I want to do a hide/show menu that shows when you click the p-tag with id menuand hides when you click the same p-tag — but apparently I'm useless on JavaScript. I don't want to use jQuery, I really want to learn this! Someone out there?
我想做一个隐藏/显示菜单，当您单击p带有 id的-tag时显示menu并在单击相同的p-tag时隐藏- 但显然我对 JavaScript 毫无用处。我不想使用jQuery，我真的很想学习这个！外面有人吗？
Here is my HTML:
这是我的 HTML：
<nav>
<p id="menu"> Menu</p>
<ul id="menu-box">
<li><a href="index.html">Start</a></li>
<li><a href="animal.html">Animal</a></li>
<li><a href="pictures.html">Pictures</a></li>
</ul>
</nav>
Here is my JavaScript (so far):
这是我的 JavaScript（到目前为止）：
function setUp() {
document.getElementById("menu").onclick = setMenu;
}
function setMenu() {
var menuBox = document.getElementById("menu-box");
menuBox.className = "menuBox";
}
setUp();
回答by Thomas Orlita
function toggleMenu() {
var menuBox = document.getElementById('menu-box');
if(menuBox.style.display == "block") { // if is menuBox displayed, hide it
menuBox.style.display = "none";
}
else { // if is menuBox hidden, display it
menuBox.style.display = "block";
}
}<p id="menu" onclick="toggleMenu()"> Menu</p>
<ul id="menu-box" style="display: block">
<li><a href="index.html">Start</a></li>
<li><a href="animal.html">Animal</a></li>
<li><a href="pictures.html">Pictures</a></li>
</ul>回答by Asm Hijas
If your learning this drop down ,then i suggest you to learn it from this button :)
如果你学习这个下拉菜单，那么我建议你从这个按钮学习它:)
<div class="dropdown">
<button onclick="myFunction()" class="dropbtn">Dropdown</button>
<div id="myDropdown" class="dropdown-content">
<a href="#">Link 1</a>
<a href="#">Link 2</a>
<a href="#">Link 3</a>
</div>
</div>
and add this style
并添加此样式
/* 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);
}
/* Links inside the dropdown */
.dropdown-content a {
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;}
Now toggle the hide and show with javascript
现在使用 javascript 切换隐藏和显示
When the user clicks on the button, toggle between hiding and showing the dropdown content
当用户点击按钮时，在隐藏和显示下拉内容之间切换
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');
}
}
}
}
回答by Szymon Pajka
Use this:
用这个：
window.nav = {
status: false,
menu: function(){
if (nav.status){
// here put class when menu is open - eg:
document.getElementById("menu-box").className = "menu-box menuopen";
nav.status = false;
} else {
// here put class when menu is closed - eg:
document.getElementById("menu-box").className = "menu-box";
nav.status = true;
}
}
}.menu-box{
display: none;
}
.menuopen{
display: block;
}<nav>
<p id="menu" onclick="nav.menu()"> Menu</p>
<ul id="menu-box">
<li><a href="index.html">Start</a></li>
<li><a href="animal.html">Animal</a></li>
<li><a href="pictures.html">Pictures</a></li>
</ul>
</nav>