如何使用JavaScript,HTML和CSS来制作一个图像按钮,它可以做到以下几点?
当它被点击时,它应该打开一个包含链接的下拉菜单。 请提供完整的代码。 下面是图像/按钮,我有代码:如何使用JavaScript,HTML和CSS来制作一个图像按钮,它可以做到以下几点?
<div class="navBar"> <img src="nav_icon.jpg" class="navButton" alt="Navigation Links">
<div class="dropdown-content">
<a href="#">Home</a>
<a href="#">Get Involved</a>
<a href="#">About Us</a>
<a href="#">Contact Us</a>
</div>
</div>
这里是CSS部分(这是不是真的有关:)
.dropdown-content{ display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
}
.navButton{
height:20px;
width:20px;
}
.navBar{
float:right;
height: 10px;
width:20%;
padding-top:4.2%;
position: relative;
display: inline-block;
}
我试过下面的例子中,这不是创造我想要的,让所有的链接出现: W3 Schools
回答:
从HTML
您提供,如果用W3School's Example比较您的标记,我看到了两个问题:导致你的菜单不能正常工作。我已在下面列出它们:
下拉菜单中应该有
id
属性。<div id="myDropdown" class="dropdown-content">
// ^^^----- This id attribute should be added.
你忘了加上
.navButton
单击事件处理程序,将切换每个被点击一次下拉菜单。<img src="nav_icon.jpg" class="navButton" onclick="myFunction()" alt="Navigation Links">
// ^^^ Add this inline click handler
/* 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('.navButton')) {
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 */ .navButton {
height:20px;
width:20px;
}
/* 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;}
<div class="navBar"> <img src="nav_icon.jpg" class="navButton" onclick="myFunction()" alt="Navigation Links">
<div id="myDropdown" class="dropdown-content">
<a href="#">Home</a>
<a href="#">Get Involved</a>
<a href="#">About Us</a>
<a href="#">Contact Us</a>
</div>
</div>
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