JavaScript：点击按钮后在 div 中加载图像

Question

我有一个隐藏的 div（通过使用最大高度和过渡），当我单击一个按钮时它会显示出来。此 div 包含多个图像，这些图像会在您首次加载网站时加载。我希望它们在我单击按钮时加载以显示 div，以使网站更轻便。

<!DOCTYPE html>
<html>
<head>
  <style>
    .class1 {
      max-height:0px;
      transition:max-height 1s;
      overflow:hidden;
    }
  </style>
  <script>
    function show() {
      document.getElementById('id1').style.maxHeight = "200px";
    }
  </script>
</head>
<body>
  <button onclick="show()">Show Images</button>
  <hr>
 
  <div id="id1" class="class1">
    <img src="img1.jpg" alt="">
    <img src="img2.jpg" alt="">
    <img src="img3.jpg" alt="">
    <img src="img4.jpg" alt="">
  </div>
 
  <hr>
</body>
</html>

Answer 1

试试这个代码

<!DOCTYPE html>
<html>
<head>
  <style>
    .class1 {
      max-height:0px;
      transition:max-height 1s;
      overflow:hidden;
    }
  </style>
  <script>
    function show() {
      document.getElementById('id1').innerHTML= '<img src="img1.jpg" alt=""><img src="img2.jpg" alt=""><img src="img3.jpg" alt=""><img src="img4.jpg" alt="">';
      document.getElementById('id1').style.maxHeight = "200px";
    }
  </script>
</head>
<body>
  <button onclick="show()">Show Images</button>
  <hr>

  <div id="id1" class="class1">

  </div>

  <hr>
</body>
</html>

Answer 2

这是工作 fiddle https://jsfiddle.net/6ve7ub79/

您可以使用 jQuery

轻松完成

jQuery

$(document).ready(function(){
$('button').bind('click', function(){
$('.i1').attr('src', 'img1.jpg');
$('.i2').attr('src', 'img2.jpg');
$('.i3').attr('src', 'img3.jpg');
$('.i4').attr('src', 'img4.jpg');
});
});

HTML

<button onclick="show()">Show Images</button>
<hr>
<div id="id1" class="class1">
<img class="i1" src="" alt="">
<img class="i2" src="" alt="">
<img class="i3" src="" alt="">
<img class="i4" src="" alt="">
</div>
<hr>

CSS

.class1 {
  transition:max-height 1s;
}

Answer 3

我建议在 img 标签上使用一个属性来存储预期的 src 属性，然后将其应用于按钮点击。这将避免在 JavaScript.

中维护 src url 列表

HTML

<button onclick="show()">Show Images</button>
<hr>

<div id="id1" class="class1">
  <img data-src="http://lorempixel.com/400/200" alt="">
  <img data-src="http://lorempixel.com/400/200" alt="">
  <img data-src="http://lorempixel.com/400/200" alt="">
  <img data-src="http://lorempixel.com/400/200" alt="">
</div>

<hr>

JS

function show() {
  document.getElementById('id1').style.maxHeight = "200px";
  var images = document.querySelectorAll("#id1 img");
  for(var i = 0; i < images.length; i++)
  {
    images[i].src = images[i].getAttribute('data-src');
  }
}

码笔-http://codepen.io/anon/pen/KrZvpJ

Answer 4

<!DOCTYPE html>
<html>
<head>
  <style>
    .class1 {
      max-height:0px;
      transition:max-height 1s;
      overflow:hidden;
    }
  </style>
  <script>
    function show() {
      document.getElementById('id1').style.maxHeight = "200px";
    }
  </script>
</head>
<body>
  <button onclick="show()">Show Images</button>
  <hr>
 
  <div id="id1" class="class1">
    <img src="img1.jpg" alt="">
    <img src="img2.jpg" alt="">
    <img src="img3.jpg" alt="">
    <img src="img4.jpg" alt="">
  </div>
 
  <hr>
</body>
</html>

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