图像验证

问题描述

function validatefileupload(Source, args)
{
  var fuData = document.getElementById(''<%= FileUpload1.ClientID %>'');
  var FileUploadPath = fuData.value;
  if(FileUploadPath =='''')
  {
    // There is no file selected
    args.IsValid = false;
  }
  else
  {
    var Extension = FileUploadPath.substring(FileUploadPath.lastIndexOf(''.'') + 1).toLowerCase();
    if (Extension == "jpg" || Extension == "gif" || Extension=="png" || Extension=="jpeg")
    {
      args.IsValid = true; // Valid file type
    }
    else
    {
      args.IsValid = false; // Not valid file type
    }
   }
}

当我选择一个文件时，它无法正常工作.请告诉我这段代码有什么问题.
正确地，当我上传任何图像时，它会显示错误消息!!! ...不会继续..

When I am selecting a file, it is not working correctly. Please tell me what is wrong in this code.
ACtually , when i upload any image it display the error message !!!... not going furthur ..

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