我有一个显示图像的模式。我希望手机上的图像能够在中间(垂直)居中,而不拉伸(stretch)它或任何东西,但无法实现。
这是我的模式(使用显示此模式的 JavaScript):
var modal = document.getElementById('imgmodal');
var img = document.getElementById('picture');
var modalImg = document.getElementById("img");
var download = document.getElementById('download-link');
img.onclick = function(){
modal.style.display = "block";
modalImg.src = this.src;
download.href = this.src;
}
var span = document.getElementById("close");
span.onclick = function() {
modal.style.display = "none";
}
/* exam_img */
#imgmodal {
display: none;
position: fixed;
z-index: 1;
padding-top: 80px;
left: 0;
top: 0;
width: 100%;
height: 100%; /* Full height */
background-color: rgb(0,0,0); /* Fallback color */
overflow: auto;
background-color: rgb(0,0,0); /* Black w/ opacity */
transition: 0.3s;
}
/* Modal Content (image) */
.content {
margin: auto;
display: block;
height: 90%;
}
/* Add Animation */
.content, #caption {
-webkit-animation-name: zoom;
-webkit-animation-duration: 0.6s;
animation-name: zoom;
animation-duration: 0.6s;
}
@-webkit-keyframes zoom {
from {-webkit-transform:scale(0)}
to {-webkit-transform:scale(1)}
}
@keyframes zoom {
from {transform:scale(0)}
to {transform:scale(1)}
}
/* 100% Image Width on Smaller Screens */
@media only screen and (max-width: 768px){
.content { /* I want image to be vertically centered on smaller screens)*/
width: 100%;
max-height: 90%;
height: auto;
}
#close {
top: 2px;
font-size: 40px;
}
#imgmodal {
padding-top: 50px;
}
#caption {
top: -1px;
}
}
<li class="exam_li">
<img id="picture" src="https://www.w3schools.com/css/img_fjords.jpg" alt="Slika Testa" width="60" height="60" class="img-resposive exam-img">
</li>
<div id="imgmodal">
<div id="caption">
<a id="download-link" download>
<span class="glyphicon glyphicon-download"></span>
<a id="download-link" download></a>
</div>
<span id="close">×</span>
<img class="content" id="img">
</div>
提前谢谢您! “工作”代码在这里:https://jsfiddle.net/dccLtfeh/
最佳答案
You need to add a css logic for the image to be vertically align on mobile device.
发布与顶部和翻译将执行逻辑。
Postion:relative
与 top:50%
一起使用,这将使图像从顶部移动 50%,然后 transform:translateY (-50%);
将其向上移动 25%,使其垂直居中。
@media only screen and (max-width: 768px) {
.content {
width: 100%;
height: auto;
position: relative;
top: calc(50% - 25px);
top: -moz-calc(50% - 25px);
top: -webkit-calc(50% - 25px);
transform: translateY(-50%);
-webkit-transform: translateY(-50%);
-moz-transform: translateY(-50%);
}
}
Here is the working code comaptible with mobile device. Check this on mobile device.
var modal = document.getElementById('imgmodal');
var img = document.getElementById('picture');
var modalImg = document.getElementById("img");
var download = document.getElementById('download-link');
img.onclick = function() {
modal.style.display = "block";
modalImg.src = this.src;
download.href = this.src;
}
var span = document.getElementById("close");
span.onclick = function() {
modal.style.display = "none";
}
.exam-img:hover {
cursor: pointer;
transition: 0.2s;
overflow: hidden;
}
/* exam_img */
#imgmodal {
display: none;
position: fixed;
z-index: 1;
padding-top: 80px;
left: 0;
top: 0;
width: 100%;
height: 100%;
/* Full height */
background-color: rgb(0, 0, 0);
/* Fallback color */
overflow: auto;
background-color: rgb(0, 0, 0);
/* Black w/ opacity */
transition: 0.3s;
}
/* Modal Content (image) */
.content {
margin: auto;
display: block;
height: 90%;
}
/* Caption of Modal Image */
#caption {
text-align: center;
color: #ccc;
position: absolute;
top: 15px;
left: 35px;
font-size: 40px;
margin-top: 0;
}
/* Add Animation */
.content,
#caption {
-webkit-animation-name: zoom;
-webkit-animation-duration: 0.6s;
animation-name: zoom;
animation-duration: 0.6s;
}
@-webkit-keyframes zoom {
from {
-webkit-transform: scale(0)
}
to {
-webkit-transform: scale(1)
}
}
@keyframes zoom {
from {
transform: scale(0)
}
to {
transform: scale(1)
}
}
/* The Close Button */
#close {
position: absolute;
top: 15px;
right: 35px;
color: #f1f1f1;
font-size: 40px;
font-weight: 100;
transition: 0.3s;
}
#close:hover,
#close:focus {
color: #989898;
text-decoration: none;
cursor: pointer;
}
#download-link {
font-size: 25px;
color: #f1f1f1;
font-weight: normal;
text-decoration: none;
transition: 0.2s;
padding: 10px;
}
#download-link:hover {
color: #989898;
}
/* 100% Image Width on Smaller Screens */
@media only screen and (max-width: 768px) {
.content {
width: 100%;
height: auto;
position: relative;
top: calc(50% - 25px);
top: -moz-calc(50% - 25px);
top: -webkit-calc(50% - 25px);
transform: translateY(-50%);
-webkit-transform: translateY(-50%);
-moz-transform: translateY(-50%);
}
#close {
top: 2px;
font-size: 40px;
}
#imgmodal {
padding-top: 50px;
}
#caption {
top: -1px;
}
@-webkit-keyframes zoom {
from {
-webkit-transform: scale(0) translateY(-50%);
}
to {
-webkit-transform: scale(1) translateY(-50%);
}
}
@keyframes zoom {
from {
transform: scale(0) translateY(-50%);
}
to {
transform: scale(1) translateY(-50%);
}
}
}
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<li class="exam_li"><img id="picture" src="https://www.w3schools.com/css/img_fjords.jpg" alt="Slika Testa" width="60" height="60" class="img-resposive exam-img"></li>
<div id="imgmodal">
<div id="caption"><a id="download-link" download><span class="glyphicon glyphicon-download"></span><a id="download-link" download></a></div>
<span id="close">×</span>
<img class="content" id="img">
关于javascript - 如何在模态中垂直居中图像?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/43654510/