问题描述
我希望垂直和水平居中我的非引导模式。
我该怎么做?
我已经给出了我使用过的 HTML CSS 和 JS 代码。
这是我所有的模态代码:
<!-- The Modal -->
<div id="myModal" class="modal center">
<!-- Modal content -->
<div class="modal-content">
<div class="modal-header">
<span class="close">×</span>
<h2>Modal Header</h2>
</div>
<div class="modal-body">
<p>Some text in the Modal Body</p>
<p>Some other text...</p>
</div>
<div class="modal-footer">
<h3>Modal Footer</h3>
</div>
</div>
</div>
/* 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: rgba(255,255,0.7); /* 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;
}
/* Modal Header */
.modal-header {
padding: 2px 16px;
background-color: #5cb85c;
color: white;
}
/* Modal Body */
.modal-body {padding: 2px 16px;}
/* Modal Footer */
.modal-footer {
padding: 2px 16px;
background-color: #5cb85c;
color: white;
}
/* Modal Content */
.modal-content {
position: relative;
background-color: #fefefe;
margin: auto;
padding: 0;
border: 1px solid #888;
width: 80%;
Box-shadow: 0 4px 8px 0 rgba(0,0.2),0 6px 20px 0 rgba(0,0.19);
animation-name: animatetop;
animation-duration: 0.4s
}
/* Add Animation */
@keyframes animatetop {
from {top: -300px; opacity: 0}
to {top: 0; opacity: 1}
}
// 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 on 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";
}
解决方法
由于它是一个 fixed
定位元素,您可以使用 transform: translate(-50%,-50%);
技巧:
/* The Modal (background) */
#blanket {
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
background-color: red;
/* Black w/ opacity */
}
.modal {
/* Hidden by default */
position: fixed;
/* Stay in place */
z-index: 1;
/* Sit on top */
left: 50%;
top: 50%;
transform: translate(-50%,-50%);
width: 100%;
/* Full width */
height: 250px;
/* Full height */
overflow: auto;
/* Enable scroll if needed */
}
/* 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;
}
/* Modal Header */
.modal-header {
padding: 2px 16px;
background-color: #5cb85c;
color: white;
}
/* Modal Body */
.modal-body {
padding: 2px 16px;
}
/* Modal Footer */
.modal-footer {
padding: 2px 16px;
background-color: #5cb85c;
color: white;
}
/* Modal Content */
.modal-content {
position: relative;
background-color: #fefefe;
margin: auto;
padding: 0;
border: 1px solid #888;
width: 80%;
box-shadow: 0 4px 8px 0 rgba(0,0.2),0 6px 20px 0 rgba(0,0.19);
animation-name: animatetop;
animation-duration: 0.4s
}
/* Add Animation */
@keyframes animatetop {
from {
top: -300px;
opacity: 0
}
to {
top: 0;
opacity: 1
}
}
<div id="blanket">
<div id="myModal" class="modal center">
<!-- Modal content -->
<div class="modal-content">
<div class="modal-header">
<span class="close">×</span>
<h2>Modal Header</h2>
</div>
<div class="modal-body">
<p>Some text in the Modal Body</p>
<p>Some other text...</p>
</div>
<div class="modal-footer">
<h3>Modal Footer</h3>
</div>
</div>
</div>
</div>