如何启动模态表单 UL 项目

Question

如何使任何 li 项在单击时启动模式。单击a时，我正在尝试登录到控制台，但它没有登录到控制台。所有代码也可以在此代码笔中看到：https://codepen.io/centem/pen/KKPJQQg

// Get the modal
var modal = document.getElementById("myModal");
// Get the button that opens the modal
var btn = document.querySelectorAll(".a");
// Get the <span> element that closes the modal
var span = document.getElementsByClassName("close")[0];
// When the user clicks the button, open the modal 
btn.onclick = function() {
modal.style.display = "block";
console.log("item clicked");
}
// When the user clicks on <span> (x), close the modal
span.onclick = function() {
modal.style.display = "none";
}
// When the user clicks anywhere outside of the modal, close it
window.onclick = function(event) {
if (event.target == modal) {
modal.style.display = "none";
}
}

Answer 1

您的问题是，将所有a的集合保存在btn变量中。集合没有onclick功能，因此当您单击其中一个按钮时不起作用。您必须为btn集合中的每个a设置onclick函数。例如：

// Get the modal
var modal = document.getElementById("myModal");
// Get the button that opens the modal
var btn = document.querySelectorAll(".a");
// Get the <span> element that closes the modal
var span = document.getElementsByClassName("close")[0];
// When the user clicks the button, open the modal 
for (let i = 0; i < btn.length; i++) {
btn[i].onclick = function() {
modal.style.display = "block";
console.log("item clicked");
}
}
// When the user clicks on <span> (x), close the modal
span.onclick = function() {
modal.style.display = "none";
}
// When the user clicks anywhere outside of the modal, close it
window.onclick = function(event) {
if (event.target == modal) {
modal.style.display = "none";
}
}

ul {
list-style-type: none;
}
.modal {
display: none; /* Hidden by default */
position: fixed; /* Stay in place */
z-index: 1; /* Sit on top */
padding-top: 100px; /* Location of the box */
left: 0;
top: 0;
width: 100%; /* Full width */
height: 100%; /* Full height */
overflow: auto; /* Enable scroll if needed */
background-color: rgb(0,0,0); /* Fallback color */
background-color: rgba(0,0,0,0.4); /* Black w/ opacity */
}
/* Modal Content */
.modal-content {
background-color: #fefefe;
margin: auto;
padding: 20px;
border: 1px solid #888;
width: 80%;
}
/* The Close Button */
.close {
color: #aaaaaa;
float: right;
font-size: 28px;
font-weight: bold;
}
.close:hover,
.close:focus {
color: #000;
text-decoration: none;
cursor: pointer;
}

<a>some other anchor tag</a>
<ul>
<li><a class="a" href="#">item</a></li>
<li><a class="a" href="#">item</a></li>
<li><a class="a" href="#">item</a></li>
</ul>
<!-- The Modal -->
<div id="myModal" class="modal">
<!-- Modal content -->
<div class="modal-content">
<span class="close">&times;</span>
<p>Some text in the Modal..</p>
</div>
</div>