如何将所选文件与js进行比较

Question

我使用https://github.com/blueimp/jQuery-File-Upload上传文件。但基本上它使用原生的javascript 文件界面。我需要检查用户是否没有两次上传同一个文件。问题是文件接口确实允许访问文件路径。

那么如何以最小的系统负载比较文件？ 感谢。

Answer 1

您可以跟踪在数组中成功上传的文件，并在添加新文件时检查它是否已存在于数组中：

var uploadedFiles = new Array();

$(inputSelector).fileupload({
  /* your configuration */
}).on('fileuploadadd', function (e, data) {
  /* this is called when a file is added for upload */

  var file = data.files[0];
  console.log('added '+file.name+','+file.type+','+file.size);

  /*
   * check here if a file with the same name, type and size has been 
   * stored in the uploadedFiles array 
   */ 

}).on('fileuploaddone', function (e, data) {
  /* this is called when a file has been uploaded successfully */

  var file = data.files[0];
  console.log('uploaded'+file.name+','+file.type+','+file.size);

  uploadedFiles.push(file);

});