模式关闭按钮不起作用

Question

这是代码。如果我打开模态，关闭按钮将不起作用，并且在刷新页面之前不会关闭。

// Get the modal
var modal = document.getElementById('myModal');
// Get the button that opens the modal
var btn = document.getElementById("myBtn");
// 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";
}
// 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";
  }
}

/* Create three columns of equal width */
.columns {
  float: left;
  width: 33.3%;
  padding: 8px;
}
/* Style the list */
.price {
  list-style-type: none;
  border: 1px solid #eee;
  margin: 0;
  padding: 0;
  -webkit-transition: 0.3s;
  transition: 0.3s;
}
/* Add shadows on hover */
.price:hover {
  box-shadow: 0 8px 12px 0 rgba(0, 0, 0, 0.2)
}
/* Pricing header */
.price .header {
  background-color: #111;
  color: white;
  font-size: 25px;
}
/* List items */
.price li {
  border-bottom: 1px solid #eee;
  padding: 20px;
  text-align: center;
}
/* Grey list item */
.price .grey {
  background-color: #eee;
  font-size: 20px;
}
/* The "Sign Up" button */
.button {
  background-color: #4CAF50;
  border: none;
  color: white;
  padding: 10px 25px;
  text-align: center;
  text-decoration: none;
  font-size: 18px;
}
/* Change the width of the three columns to 100% 
    (to stack horizontally on small screens) */
@media only screen and (max-width: 600px) {
  .columns {
    width: 100%;
  }
}
/* The Modal (background) */
.modal {
  display: none;
  /* Hidden by default */
  position: fixed;
  /* Stay in place */
  z-index: 1;
  /* Sit on top */
  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/Box */
.modal-content {
  background-color: #fefefe;
  margin: 15% auto;
  /* 15% from the top and centered */
  padding: 20px;
  border: 1px solid #888;
  width: 80%;
  /* Could be more or less, depending on screen size */
}
/* The Close Button */
.close {
  color: #aaa;
  float: right;
  font-size: 28px;
  font-weight: bold;
}
.close:hover,
.close:focus {
  color: black;
  text-decoration: none;
  cursor: pointer;
}

<div class="columns">
  <ul class="price">
    <li class="header">Hard Drive Format</li>
    <li class="grey">£10</li>
    <li>Format Hard Drive</li>
    <li>Removes ALL Files From Drive</li>
    <li>Fresh Install Windows</li>
    <li class="grey"><button onclick="document.getElementById('myModal').style.display='block'">Sign 
    Up</button></li>
  </ul>
</div>
<!-- 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>

我想要的只是在单击按钮时关闭模态。

Answer 1

在你的代码中，没有id myBtn的元素

所以删除以下代码

// Get the button that opens the modal
var btn = document.getElementById("myBtn");
// When the user clicks the button, open the modal 
btn.onclick = function() {
modal.style.display = "block";
}

它会正常工作

Answer 2

您没有为按钮提供 ID。因此，javascript在向按钮添加事件侦听器的那一行失败了。因此，以下语句未执行。

<div class="columns">
<ul class="price">
<li class="header">Hard Drive Format</li>
<li class="grey">£10</li>
<li>Format Hard Drive</li>
<li>Removes ALL Files From Drive</li>
<li>Fresh Install Windows</li>
<li class="grey"><button id="myBtn">Sign Up</button></li>
</ul>
</div>
<!-- The Modal -->
<div id="myModal" style="display:none;" class="modal">
<!-- Modal content -->
<div class="modal-content">
<span class="close">&times;</span>
<p>Some text in the Modal..</p>
</div>
</div>
// Get the modal
var modal = document.getElementById('myModal');
// Get the button that opens the modal
var btn = document.getElementById("myBtn");
// 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";
}
// 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";
}
}

这是解决方案：https://jsfiddle.net/xf7whk0o/

Answer 3

在关闭按钮中使用它。

data-dismiss="modal">

像这样使用它：

<button type="btn btn-default" data-dismiss="modal">CLOSE</button>