Is it possible to check if a file exists on disk using Javascript (not running in a browser)? - Stack Overflow

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I am using an app that uses only JavaScript as its scripting language. I have a .ini file and I need to see if it exists. Is this possible?

Also, if it doesn't exist, how can I halt the execution?

I am using an app that uses only JavaScript as its scripting language. I have a .ini file and I need to see if it exists. Is this possible?

Also, if it doesn't exist, how can I halt the execution?

• javascript
• file-io

Share Improve this question Follow edited Jul 18, 2018 at 19:52 Marco Altieri 3,81822 gold badges3737 silver badges5050 bronze badges asked Sep 7, 2011 at 17:38 Joan VengeJoan Venge 331k223223 gold badges495495 silver badges706706 bronze badges 4

• what app are you using? it depends on what they provide for you. – Daniel A. White Commented Sep 7, 2011 at 17:41
• As long as Javascript is not running in the server, then it might be possible to do that. But I need to know the OS that you are targeting.? – billygoat Commented Sep 7, 2011 at 17:42
• Sorry it's Win7. Also the app I use doesn't give any extra functionality other than controlling the app, which are stuff like adding effects, text on an image, resize image, delete layers, etc. But no generic file IO or libs. – Joan Venge Commented Sep 7, 2011 at 17:45
• it would be helpful to know what it is. – Daniel A. White Commented Sep 7, 2011 at 18:12

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3 Answers 3

Sorted by: Reset to default 3

Ok doing something like this works:

var file = new File(datafile);
var result = file.open ('r');

if result is true, then the file exists, otherwise false means the file does not exist.

"Yes", assuming ActiveX can be used.

See FileSystemObject aka "FSO" (the FileExists method in particular). FSO is part of Windows Scripting.

It is also possible to use the MSXML load method to access a "file://" and catch the appropriate error. (I don't know if a vanilla XmlHttpRequest request of "file://" can be used here, and/or in what contexts... it might differ between the XHR from MSXML and the one baked into IE7/8 as well.)

Happy coding.

---

If the JavaScript runs from an HTA/HTML Aplication or Windows Sidgebar Gadget, etc, then it's in "Security Level 0" or "Demigod Mode".

On the other hand, an HTA runs as a fully trusted application and therefore has more privileges than a normal HTML file...

Try this:

var myfile = new File(myfile_path);

if (!myfile.exists) {
    alert(myfile + " could not be found!");
}

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