无法垂直居中模式图像

Question

我正在处理这个照片库，单击图像缩略图后会打开一个模式以显示全尺寸图像。

模态工作完美，但当图像高度较短时，图像不会显示在中心。 我所说的中心是垂直的。 从水平上看，它完全位于中心。

模态代码取自W3School 的网站，我通过删除标题稍微更改了 html 和 css。

我试过的：

我尝试通过在.modal类中添加以下代码来使模态居中：

  top:50%; 
  left:50%; 
  transform:translate(-50%, -50%); 

还尝试了margin: 0 auto 。 但似乎没有任何效果。

这是模态的工作版本，其图像不垂直居中：

 // Get the modal const modal = document.querySelector(".modal"); // Get the image and insert it inside the modal - use its "alt" text as a caption const img = document.querySelectorAll(".myImg"); const modalImg = document.querySelector(".img01"); img.forEach((item) => { item.onclick = function(e) { modal.style.display = "block"; modalImg.src = e.target.src; } }); // Get the <span> element that closes the modal var span = document.getElementsByClassName("close")[0]; // When the user clicks on <span> (x), close the modal span.onclick = function() { modal.style.display = "none"; } window.onclick = function(event) { if (event.target == modal) { modal.style.display = 'none'; } }

 .myImg { border-radius: 5px; cursor: pointer; -webkit-transition: 0.3s; -o-transition: 0.3s; transition: 0.3s; } .myImg:hover { opacity: 0.7; } .modal { display: none; position: fixed; z-index: 999; padding-top: 35px; left: 0; top: 0; width: 100%; height: 100%; overflow: auto; background-color: rgb(0, 0, 0); background-color: rgba(0, 0, 0, 0.9); } /* Modal Content (image) */ .modal-content { margin: auto; display: block; } /* Add Animation */ .modal-content { -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 { -webkit-transform: scale(0); transform: scale(0) } to { -webkit-transform: scale(1); transform: scale(1) } } /* The Close Button */ .close { position: absolute; top: 15px; right: 35px; color: #f1f1f1; font-size: 40px; font-weight: bold; -webkit-transition: 0.3s; -o-transition: 0.3s; transition: 0.3s; } .close:hover, .close:focus { color: #bbb; text-decoration: none; cursor: pointer; }

 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <img class="myImg" src="https://lazykcamping.com/assets/Slide-3-Field.jpg" style="width:100%;max-width:500px"> <!-- The Modal --> <div class="modal"> <span class="close">&times;</span> <img class="modal-content img01"> </div>

我怎样才能垂直居中？

Answer 1

将此添加到.modal-content

position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%,-50%);

Answer 2

这应该使模态图像居中。 签入全屏视图。

编辑：一行 JS，两行 CSS。 （其余的是你的代码）

 // Get the modal const modal = document.querySelector(".modal"); // Get the image and insert it inside the modal - use its "alt" text as a caption const img = document.querySelectorAll(".myImg"); const modalImg = document.querySelector(".img01"); img.forEach((item) => { item.onclick = function(e) { modal.style.setProperty("display", "flex", "important"); modalImg.src = e.target.src; } }); // Get the <span> element that closes the modal var span = document.getElementsByClassName("close")[0]; // When the user clicks on <span> (x), close the modal span.onclick = function() { modal.style.display = "none"; } window.onclick = function(event) { if (event.target == modal) { modal.style.display = 'none'; } }

 .myImg { border-radius: 5px; cursor: pointer; -webkit-transition: 0.3s; -o-transition: 0.3s; transition: 0.3s; } .myImg:hover { opacity: 0.7; } .modal { display: none; position: fixed; align-items: center; justify-content: center; z-index: 999; padding-top: 35px; left: 0; top: 0; width: 100%; height: 100%; overflow: auto; background-color: rgb(0, 0, 0); background-color: rgba(0, 0, 0, 0.9); } .center-img{ display: flex; align-items: center; justify-content: center; } /* Modal Content (image) */ .modal-content { margin: auto; display: block; } /* Add Animation */ .modal-content { -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 { -webkit-transform: scale(0); transform: scale(0) } to { -webkit-transform: scale(1); transform: scale(1) } } /* The Close Button */ .close { position: absolute; top: 15px; right: 35px; color: #f1f1f1; font-size: 40px; font-weight: bold; -webkit-transition: 0.3s; -o-transition: 0.3s; transition: 0.3s; } .close:hover, .close:focus { color: #bbb; text-decoration: none; cursor: pointer; }

 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <img class="myImg" src="https://lazykcamping.com/assets/Slide-3-Field.jpg" style="width:100%;max-width:500px"> <!-- The Modal --> <div class="modal"> <span class="close">&times;</span> <img class="modal-content img01"> </div>