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Re: Write variables to file?

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On 10.09.2013 05:10, Robert Crandal wrote:> Can I use Javascript to 
write data into a text file on the
 > client machine?  I tried experiement with cookie objects, but this
 > didn't produce the results that I wanted.
 >
 > My webpage will display a form with text fields.  The user
 > will type in data.  I then want to save this data somehow on
 > the client machine.

Simple answer: no.

Imagine what harm a "bad hacker" could do if you could write directly to 
a user's ordinary file system.

All the direct storage mechanims in a browser are sand-boxed, being Web 
Storage (localStorage and sessionStorage), File API (currently only 
supported in Chrome), Indexed DB or WebSQL (latter now deprecated but 
still widely supported).

You can however provide the text file as a data-uri and make it 
available from a link with the new download attribute set so when a user 
clicks the link a save as file requester will appear allowing user to 
save the file initially set with the name you set.

You can encode data-uri's as Base64 or printed-quotable. You can also 
use a Blob object to retrieve a link from.

You can create this element dynamically using document.createElement() 
(and hint: you can also produce a click event for it) or simply set the 
download and href attributes on an existing a element at run-time.


-- 
Ken Fyrstenberg
Abdias Software
http://abdiassoftware.com/
(remove usenet- from address)

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Thread

Write variables to file? "Robert Crandal" <rcranz143101@gmail.com> - 2013-09-10 03:10 -0700
  Re: Write variables to file? Denis McMahon <denismfmcmahon@gmail.com> - 2013-09-10 10:24 +0000
  Re: Write variables to file? Richard Maher <maher_rjSPAMLESS@hotmail.com> - 2013-09-10 18:42 +0800
  Re: Write variables to file? Martin Honnen <mahotrash@yahoo.de> - 2013-09-10 12:45 +0200
  Re: Write variables to file? JJ <duh@nah.meh> - 2013-09-10 18:13 +0700
    Re: Write variables to file? Ken <usenet-so@abdiassoftware.com> - 2013-09-10 12:15 -0500
    Re: Write variables to file? dhtml <dhtmlkitchen@gmail.com> - 2013-09-30 00:44 -0700
  Re: Write variables to file? Ken <usenet-so@abdiassoftware.com> - 2013-09-10 12:31 -0500

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