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The main reason why webmasters like to use AJAX technology to submit
user data input is that unlike conventional form submit it can transfer
data to the server without refreshing webpage. This technology can also
capable to display the response from server side to the client computer.
But AJAX technology can only transfer text data in UTF-8 format. So
upload file using AJAX technology is not possible. But using iframe
object it is possible to create an interface over a HTML form such that
it produces an effect AJAX upload, i.e. it can upload one or more files
without refreshing the webpage and also display the server response. more...
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