You can read a local file from javascript.

Tue, 12/09/2008 - 20:42 — chrisdew

It turns out that you can access a local file from javascript.

To do so, you need a file upload field. When the user chooses a file to upload, javascript gets read access to that file immediately, even if the form is never submitted.

This access allows client-side javascript validation and processing of file upload fields.

Can anyone think of an interesting use for this? Some mundane possibilities are:

Resize a large image in javascript, before uploading it.
Virus-check a file in javascript (yes, very inefficient)
Allow a pyjamas/GWT client-side app to load a file from the local filesystem.
Maliciously access/upload a file which a user has selected by mistake, before they submit the form.

I discovered this feature during development of the next-generation appliance platform for ApplianSys Ltd. It's nice to be able to warn a user, client-side, before they upload an incorrect multi-megabyte firmware image.

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Tue, 02/16/2010 - 08:16 — rugusha

reading local file system using javascript

eeeh, thats very interesting!
could u please send me sme working code that can implement that?
Thanxs.

Thu, 12/03/2009 - 16:57 — calvert

Благодарю!

Спасибо Вам за то что вы есть !

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