Using HTML5/javascript to generate and save a file

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1.00/5 (2 votes)

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And to be clear: I am not trying to access the filesystem without the users knowledge! The user will provide a file (probably via drag and drop), the script will transform the file in memory, and the user will be prompted to download the result. All of which should be "safe" activities as far as the browser is concerned.

What I have tried:

Making a very simple input html page

Posted 9-Feb-21 5:38am

Member 15068800

Updated 9-Feb-21 7:44am

PIEBALDconsult

v2

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20212a 9-Feb-21 13:19pm

I don't think javascript can manipulate a file.

CHill60 9-Feb-21 13:25pm

Use the FileSystemObject

20212a 9-Feb-21 13:37pm

That's not JavaScript is it?

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CHill60 · Answer 1 · 2021-02-09T07:25:00

Solution 1

Try this CP article as a starting point File Handling at Client Side Using Javascript[^]

[EDIT] A more modern approach is documented here - Using files from web applications - Web APIs | MDN[^]

Posted 9-Feb-21 7:25am

CHill60

Updated 9-Feb-21 7:49am

v2

Comments

20212a 9-Feb-21 13:38pm

That uses ActiveXObject which is only supported in IE, and I'm not even sure IE is supported anymore.

CHill60 9-Feb-21 13:58pm

IE due to retire August this year. IE mode can be supported in Chromium based Edge. There are also some (awful) work-arounds for other browsers. Nevertheless I have updated my solution with a more modern approach as question is explicitly tagged HTML5. OP appears to be a spammer anyway

20212a 9-Feb-21 14:00pm

Ya, looks like they might be trying to gain points.