如何获取多个div的背景图像并将它们用作模态图像的来源JavaScript？

Question

我正在创建一个图片库，我希望能够在点击时打开全尺寸图片。

问题是我没有使用 img 标签，我使用 div 和 background-image 创建它。

我知道如何使用 id 对单个图像执行此操作，代码如下。但是，我无法使用 classes 使其与多个 div 一起使用。这可能很简单，但我知道基本的 JavaScript 不足以完成这项任务。我在这个问题上搜索了很多但没有结果。我尝试过 lightbox 但无法使其与背景图像一起使用。任何帮助将不胜感激，甚至是一些让我走上正确道路的提示。

var modal = document.getElementById("myModal");
var img = document.getElementById("tehran");
var backgroundImage = img.style.backgroundImage.slice(4, -1).replace(/"/g, '');
var modalImg = document.getElementById("img01");
var captionText = document.getElementById("caption");
img.onclick = function() {
  modal.style.display = "block";
  modalImg.src = backgroundImage;
}
// close the modal
var span = document.getElementsByClassName("close")[0];
span.onclick = function() {
  modal.style.display = "none";
}

.close {
  position: absolute;
  top: 15px;
  right: 35px;
  color: #f1f1f1;
  font-size: 40px;
  font-weight: bold;
  transition: 0.3s;
}

.close:hover,
.close:focus {
  color: #bbb;
  text-decoration: none;
  cursor: pointer;
}

.img {
  display: block;
  width: 200px;
  height: 100%;
  margin-right: 10px;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  cursor: pointer;
}

.img-container {
  display: flex;
  height: 100px;
  min-height: 20rem;
}

.modal {
  display: none;
  position: fixed;
  z-index: 1;
  padding-top: 100px;
  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 {
  margin: auto;
  display: block;
  width: 80%;
  max-width: 700px;
  animation-name: zoom;
  animation-duration: 0.6s;
}

@keyframes zoom {
  from {
    transform: scale(0)
  }
  to {
    transform: scale(1)
  }
}

<body>
  <div class="img-container">
    <div id="tehran" class="img" style="background-image: url(https://images.unsplash.com/photo-1524567492592-cee28084482e?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=600&q=60)"></div>
    <div id="masuleh" class="img" style="background-image: url(https://images.unsplash.com/photo-1567317255448-8e6c04e22114?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=634&q=80)"></div>
    <div id="zanjan" class="img" style="background-image: url(https://images.unsplash.com/photo-1518727577784-f62f1115eefb?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1050&q=80)"></div>
  </div>

  <!-- The Modal -->
  <div id="myModal" class="modal">

    <!-- The Close Button -->
    <span class="close">&times;</span>

    <!-- Modal Content -->
    <img id="img01" class="modal-content">
    <div id="caption"></div>
  </div>
</body>

Answer 1

（我还做了一些 css 修改，使模态图像不会溢出页面）

var modal = document.getElementById("myModal");
Array.from(document.querySelectorAll('.img-container .img')).forEach(function(img){
img.onclick = function() {
  var backgroundImage = img.style.backgroundImage.slice(4, -1).replace(/"/g, '');
  modal.style.display = "flex";
  modalImg.src = backgroundImage;
}
});
var modalImg = document.getElementById("img01");
var captionText = document.getElementById("caption");

// close the modal
var span = document.getElementsByClassName("close")[0];
span.onclick = function() {
  modal.style.display = "none";
}

.close {
  position: absolute;
  top: 15px;
  right: 35px;
  color: #f1f1f1;
  font-size: 40px;
  font-weight: bold;
  transition: 0.3s;
}

.close:hover,
.close:focus {
  color: #bbb;
  text-decoration: none;
  cursor: pointer;
}

.img {
  display: block;
  width: 200px;
  height: 100%;
  margin-right: 10px;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  cursor: pointer;
}

.img-container {
  display: flex;
  height: 100px;
  min-height: 20rem;
}

.modal {
  display: none;
  position: fixed;
  z-index: 1;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  box-sizing: border-box;
  overflow: auto;
  background-color: rgb(0, 0, 0);
  background-color: rgba(0, 0, 0, 0.9);
  justify-content: center;
  align-items: center;
}

.modal-content {
  margin: auto;
  display: block;
  width: 80%;
  max-width: 700px;
  max-height: 80%;
  object-fit: contain;
  -o-object-fit: contain;
  animation-name: zoom;
  animation-duration: 0.6s;
}

@keyframes zoom {
  from {
    transform: scale(0)
  }
  to {
    transform: scale(1)
  }
}

<body>
  <div class="img-container">
    <div id="tehran" class="img" style="background-image: url(https://images.unsplash.com/photo-1524567492592-cee28084482e?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=600&q=60)"></div>
    <div id="masuleh" class="img" style="background-image: url(https://images.unsplash.com/photo-1567317255448-8e6c04e22114?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=634&q=80)"></div>
    <div id="zanjan" class="img" style="background-image: url(https://images.unsplash.com/photo-1518727577784-f62f1115eefb?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1050&q=80)"></div>
  </div>

  <!-- The Modal -->
  <div id="myModal" class="modal">

    <!-- The Close Button -->
    <span class="close">&times;</span>

    <!-- Modal Content -->
    <img id="img01" class="modal-content">
    <div id="caption"></div>
  </div>
</body>

Answer 2

您必须定位所有元素（按 class），然后遍历它们以附加事件（点击).

此外，由于 img 具有预定义的含义，我建议您使用其他名称，如 class 除了img.

您可以尝试以下方式：

var modal = document.getElementById("myModal");
var img = document.querySelectorAll(".myImg");

var modalImg = document.getElementById("img01");
var captionText = document.getElementById("caption");
img.forEach(function(img){
  var backgroundImage = img.style.backgroundImage.slice(4, -1).replace(/"/g, '');
  img.onclick = function() {
    modal.style.display = "block";
    modalImg.src = backgroundImage;
  }
});
// close the modal
var span = document.getElementsByClassName("close")[0];
span.onclick = function() {
  modal.style.display = "none";
}

.img-container {
  display: flex;
  height: 100px;
  min-height: 20rem;
}

.myImg {
  display: block;
  width: 200px;
  height: 100%;
  margin-right: 10px;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  cursor: pointer;
}

.modal {
  display: none;
  position: fixed;
  z-index: 1;
  padding-top: 100px;
  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 {
  margin: auto;
  display: block;
  width: 80%;
  max-width: 700px;
  animation-name: zoom;
  animation-duration: 0.6s;
}

@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: bold;
  transition: 0.3s;
}

.close:hover,
.close:focus {
  color: #bbb;
  text-decoration: none;
  cursor: pointer;
}

<body>
  <div class="img-container">
    <div id="tehran" class="myImg" style="background-image: url(https://images.unsplash.com/photo-1524567492592-cee28084482e?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=600&q=60)"></div>
    <div id="masuleh" class="myImg" style="background-image: url(https://images.unsplash.com/photo-1567317255448-8e6c04e22114?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=634&q=80)"></div>
    <div id="zanjan" class="myImg" style="background-image: url(https://images.unsplash.com/photo-1518727577784-f62f1115eefb?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1050&q=80)"></div>
  </div>

  <!-- The Modal -->
  <div id="myModal" class="modal">

    <!-- The Close Button -->
    <span class="close">&times;</span>

    <!-- Modal Content -->
    <img id="img01" class="modal-content">
    <div id="caption"></div>
  </div>
</body>

如何获取多个div的背景图像并将它们用作模态图像的来源JavaScript？

How to get the background-image of multiple divs and use them as the source of modal images with JavaScript?

javascript

jquery

image-processing

image-gallery