HTML input Type=file File Select a summary of the form (i)

HTML input Type=file in the process of uploading files in onchange, encountered the same file two times the issue of invalid upload.

recently in the process of doing the project, encountered the same file upload time, two uploads did not effect, found the information, found the reason:

It is explained as follows:

Input[type=file] Use onchange to do, onchange listen to the value of input, only when the content changes to trigger the time, and value in the upload of the file is the content of the file is saved, You only need to empty the value of the current input in the callback for the successful upload:

   event.target.value=‘‘;

HTML input Type=file File Select a summary of the form (i)