Append to file using Javascript

Question

I have the following script:

document.open("text","c:\\path\\to\\file\\browser.txt");

appendChild(navigator.appCodeName + ";");
appendChild(navigator.appName + ";");
appendChild(navigator.appVersion + ";");
appendChild(navigator.userAgent + ";");
appendChild(navigator.platform + ";");
appendChild(is_java + ";");

// ----------------------

if (is_opera) {
     appendChild("<TT>***Version numbers here are only valid</TT><BR>");
     appendChild("<TT>***if Opera is set to identify itself as Opera</TT><BR>");
     appendChild("<TT>***use is_opera vars instead</TT><BR>");
     }
     appendChild(is_major + ";");
     appendChild(is_minor + ";");

// ----------------------

if (is_opera) {
     if (is_opera7up) {
     appendChild(is_js);
         } else {
         appendChild(is_js);
         }
             } else {
             appendChild(is_js + ";");
             }

// ----------------------

appendChild(is_screen + ";");
if (window.screen) {
     appendChild(screen.height + ";");
     appendChild(screen.width + ";");
     appendChild(screen.availHeight + ";");
     appendChild(screen.availWidth + ";");
     appendChild(screen.colorDepth + ";");
}

// ----------------------

if (is_Flash) {
     appendChild(is_FlashVersion);
     } else {
     appendChild("unknown");
     }

document.close();

It does what I want it to do by collecting browser information. HOWEVER, it is not writing information to the file. How do I make it append the browser information to the text file?

You see the appendChild -- I also tried using document.write (which puts the information on the screen).

I am a Javascript newbie so please make your answers as straightforward as possible. Thank you.

You cannot simply create an arbitrary file via JavaScript hosted in a web browser. What is your rationale/end goal for this? — Alex K.
– Alex K., Commented Aug 10, 2015 at 16:29
shouldn't you be storing a reference to the document you opened? as in var myDoc = document.open("text","c:\\path\\to\\file\\browser.txt"); myDoc.appendChild(navigator.appCodeName + ";"); ... — RAEC
– RAEC, Commented Aug 10, 2015 at 16:32
What is your appendChild() function? What does it try to do? Where's the code for it? — jfriend00
– jfriend00, Commented Aug 10, 2015 at 16:35
@AlexK.: I'm just trying to log some browser information for users of a local intranet. — Mr_Thomas
– Mr_Thomas, Commented Aug 10, 2015 at 16:35

fielfdjf · Accepted Answer · 2015-08-10 16:38:33Z

1

You can not do this. Beacuse browser can not write file.

You can use node.js https://nodejs.org/api/fs.html

answered Aug 10, 2015 at 16:38

fielfdjf

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Community · Accepted Answer · 2017-05-23 12:14:38Z

0

You can generate a file for download. Check the solutions here:

Javascript: Create and save file, and Using HTML5/Javascript to generate and save a file

edited May 23, 2017 at 12:14

CommunityBot

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answered Aug 10, 2015 at 16:43

Tolbxela

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Community · Accepted Answer · 2017-05-23 12:14:38Z

-2

This is a very common newbie Javascript question that you could answer for yourself with a quick Google search. Web browsers will not let you write files to the local filesystem.

(This question should be closed as a dup. For example: Is it possible to write to a file (on a disk) using JavaScript?)

edited May 23, 2017 at 12:14

CommunityBot

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answered Aug 10, 2015 at 16:42

Ghazgkull

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2 Comments

Mr_Thomas Over a year ago

I did a Google search but it seemed all that I was getting was Vbscript and ASP examples which, obviously, I don't want.

Ghazgkull Over a year ago

Okay. Well, the answer is "No". The browsers won't let Javascript write files to the local filesystem because it would be a security problem. Imagine the damage a malicious website could do if they could write files to disk.

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