我正在做一个WebApp,在那里人们将上传2张图像,我需要通过python代码来传递这些图像。因此,我只想让他们在上传2张图像后发送。

我一直在阅读其他文章,例如:

How to disable submit button until file is selected

Enable submit button after uploading more than 1 file

但是我无法将其推断为我的情况:

<!DOCTYPE html>
<html>
<head>
    <link rel="stylesheet" type="text/css" href="https://unpkg.com/file-upload-with-preview@3.4.3/dist/file-upload-with-preview.min.css">
</head>


<body>
  <!-- Uploader -->
<div class="custom-file-container" data-upload-id="myImage">
    <label>Upload your images <a href="javascript:void(0)" class="custom-file-container__image-clear" title="Clear Image">&times;</a></label>

    <label class="custom-file-container__custom-file" >
      <form id="upload-form" action="{{url_for('upload')}}" method="POST" enctype="multipart/form-data">
      <input type="file" class="custom-file-container__custom-file__custom-file-input" accept="image/*" aria-label="Choose File" multiple>
      <input type="hidden" name="MAX_FILE_SIZE" value="10485760" />
      <span class="custom-file-container__custom-file__custom-file-control"></span>
    </label>
    <div class="custom-file-container__image-preview"></div>
</div>
<input type="submit" name="send" disabled/>
</div>


<script src="https://unpkg.com/file-upload-with-preview@3.4.3/dist/file-upload-with-preview.min.js"></script>

<script>
      var upload = new FileUploadWithPreview('myImage', {showDeleteButtonOnImages: true, text: {chooseFile: 'Nom del fitxer', browse: 'Examina'}})
</script>

<script src="https://code.jquery.com/jquery-1.9.1.min.js"></script>

<script>

$(document).ready(
    function(){
        $('input:file').change(
            function(){
                if ($(this).val()) {
                    $('input:submit').attr('disabled',false);;
                }
            }
            );
    });

</script>

</body>
</html>


添加的最后一个脚本是第一个链接中给出的解决方案,它可以正常工作,但不是我想要的。

文件上传器代码来自https://github.com/promosis/file-upload-with-preview,在这里我看到有一个称为selectedFilesCount的方法可能有用。

感谢您的时间,如果您在我的代码中看到一些废话,则感到抱歉,但是我是这些语言的新手...

最佳答案

您可以从上传对象中插入upload.cachedFileArray以检查array长度,以验证是否已选择2个文件进行上传。这是通过受window event listeners fileUploadWithPreview:imageSelectedfileUploadWithPreview:imageDelete绑定的toggle()函数检查的,因此,如果在选择图像后将其删除,则仍可以执行规则2:



$(document).ready(function() {

});

var toggle = function() {
  //console.log(upload.cachedFileArray.length);
  if (upload.cachedFileArray.length == 2) {
    $('input:submit').attr('disabled', false);
  } else {
    $('input:submit').attr('disabled', true);
  }
};

window.addEventListener('fileUploadWithPreview:imageSelected', function(e) {
  // optionally you could pass the length into the toggle function as a param
  // console.log(e.detail.cachedFileArray.length);
  toggle();
});

window.addEventListener('fileUploadWithPreview:imageDeleted', function(e) {
  // optionally you could pass the length into the toggle function as a param
  // console.log(e.detail.cachedFileArray.length);
  toggle();
});

<!DOCTYPE html>
<html>

<head>
  <link rel="stylesheet" type="text/css" href="https://unpkg.com/file-upload-with-preview@3.4.3/dist/file-upload-with-preview.min.css">
</head>

<body>
  <!-- Uploader -->
  <div class="custom-file-container" data-upload-id="myImage">
    <label>Upload your images <a href="javascript:void(0)" class="custom-file-container__image-clear" title="Clear Image">&times;</a></label>

    <label class="custom-file-container__custom-file">
      <form id="upload-form" action="{{url_for('upload')}}" method="POST" enctype="multipart/form-data">
      <input type="file" class="custom-file-container__custom-file__custom-file-input" accept="image/*" aria-label="Choose File" multiple>
      <input type="hidden" name="MAX_FILE_SIZE" value="10485760" />
      <span class="custom-file-container__custom-file__custom-file-control"></span>
    </label>
    <div class="custom-file-container__image-preview"></div>
  </div>
  <input type="submit" name="send" disabled/>
  </div>
  <script src="https://unpkg.com/file-upload-with-preview@3.4.3/dist/file-upload-with-preview.min.js"></script>
  <script>
    var upload = new FileUploadWithPreview('myImage', {
      showDeleteButtonOnImages: true,
      text: {
        chooseFile: 'Nom del fitxer',
        browse: 'Examina'
      }
    });
  </script>
  <script src="https://code.jquery.com/jquery-1.9.1.min.js"></script>
</body>

</html>

关于javascript - 如何在多个文件上传器中启用提交按钮直到条件?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/55958372/

10-11 12:55
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