How can I achieve uploading same files as a batch using jQuery?

When uploading some image/audio/video files in the same batch I want the file selected in the one field should not get accepted in the other buttons. How can I achieve this?

From stackoverflow

• sorry the question does not make much sense. Can you try to explain in more detail and maybe post some code or a link to your issue.

• I think you are asking how to make it so no two files in a list of file upload boxes are the same, so you don't accidentally upload the same file twice.

  This could be easily done using the input.onchange event. When you add a new file input box, assign its onchange event to a function like this one:

  function fileChanged()
  {
          $(createFileInput()).insertAfter(this).wrap('<p>' + '</p>').change(fileChanged);
  
          if(!isFileUnique(this))
          {
              $(this).remove();
  
              alert('You already chose to upload this file.\nPlease choose a different file.');
  
              return false;
          }
  
          return true;
  }
  

  Use some helper functions:

  function isFileUnique(input) {
      if(input.value == '')
          return true;
  
      var fileInputs = $(input).parents('form').find('input:file');
  
      var sameInputs = $.grep(fileInputs, function(item, index) {
          if(item == input)
              return false;
  
          if(item.value == input.value)
              return true;
  
          return false;
      });
  
      return sameInputs.length == 0;
  }
  
  function createFileInput() {
      var input = document.createElement('input');
  
      input.type = 'file';
  
      return input;
  }
  

  Things are a little complicated because you can't do a mere "this.value = '';" So we just delete "this" and create a new input field. We need to create a new one anyway (so the user can upload an extra file), so it the issue is counteracted.

  (Return values for fileChanged aren't needed, because I don't think file inputs will allow Javascript to ignore the change command.)