标签内容文件图像预览脚本不起作用

Question

图片预览功能在第一个选项卡上可以正常使用，为什么它在其他选项卡上不起作用，我正在通过单击选项卡重新加载图像预览功能，我在网上找不到这方面的示例问题。
有什么想法吗？

<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>jQuery UI Tabs - Default functionality</title>
  <link rel="stylesheet" href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
  <script src="https://code.jquery.com/jquery-1.12.4.js"></script>
  <script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
  <script>
      $( function() {
        $( "#tabs" ).tabs();
    } );
    
    function PreviewImage() {
    var count   = $('.tab-content').data('id');
    var preview = document.getElementById('uploadPreview_'+count);
    var file    = document.getElementById('uploadImage_'+count).files[0];
    var reader  = new FileReader();

    reader.addEventListener("load", function () {
        preview.src = reader.result;
    }, false);

    if (file) {
        reader.readAsDataURL(file);
    }
};

$(document).on('click', '#tab',function(e){
    PreviewImage();
    e.preventDefault();
});
</script>
</head>
<body>
   <div id="tabs">
      <ul class="nav nav-tabs" data-toggle="tabs">
        <li id="tab"><a href="#tabs-1"> tab 1</a></li>
        <li id="tab"><a href="#tabs-2"> tab 2</a></li>
    </ul>
    <div id="tabs-1" class="tab-content" data-id="1">
     <img id="uploadPreview_1" src="" alt="background" class="img-responsive center-block widget-background" style="height: 180px; width: auto;"  alt="image-alt">
     <input id="uploadImage_1" type="file" accept="image/*" onchange="PreviewImage();"/>

 </div>
 <div id="tabs-2" class="tab-content" data-id="2">
     <img id="uploadPreview_2" src="" alt="background" class="img-responsive center-block widget-background" style="height: 180px; width: auto;"  alt="image-alt">
     <input id="uploadImage_2" type="file" accept="image/*" onchange="PreviewImage();"/>

 </div>
</div>
</body>
</html>

Answer 1

现在可以使用了。

我觉得光看代码就有道理

但是你可以看到我们需要传递上下文来预览图像。

$(function() {
  $("#tabs").tabs();
});

function PreviewImage(tab) {
  var preview = tab.parentNode.querySelector('img');
  var file =  tab.files[0]; 
  var reader = new FileReader();

  reader.addEventListener("load", function() {
    preview.src = reader.result;
  }, false);

  if (file) {
    reader.readAsDataURL(file);
  }
};

document.addEventListener('change', (e) => {
  if(e.target.matches('input[type="file"]')) {
    console.log(e.target);
    PreviewImage(e.target);
  }
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<link rel="stylesheet" href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>

<body>
  <div id="tabs">
    <ul class="nav nav-tabs" data-toggle="tabs">
      <!-- Corrected id : Should be unique / added class tab for click. -->
      <li id="tab1" class="tab"><a href="#tabs-1"> tab 1</a></li>
      <li id="tab2" class="tab"><a href="#tabs-2"> tab 2</a></li>
    </ul>
    <div id="tabs-1" class="tab-content" data-id="1">
      <img id="uploadPreview_1" src="" alt="background" class="img-responsive center-block widget-background" style="height: 180px; width: auto;" alt="image-alt">
      <input id="uploadImage_1"  type="file" accept="image/*" />

    </div>
    <div id="tabs-2" class="tab-content" data-id="2">
      <img id="uploadPreview_2" src="" alt="background" class="img-responsive center-block widget-background" style="height: 180px; width: auto;" alt="image-alt">
      <input id="uploadImage_2"  type="file" accept="image/*" />

    </div>
  </div>
</body>

标签内容文件图像预览脚本不起作用

Tabs content file image preview script not working

javascript

image

preview

while-loop

jquery-ui-tabs