JavaScript works when calling with Node but only particularly when calling from HTML

Question

My externaljsfile.JS looks like this:

"use strict";

const fsLibrary  = require('fs');

function save_installform() {
  alert("Step1");
  fsLibrary.writeFile('/home/pi/newfile.txt', "Hello world.", (error) => {
    alert("Error");
  });
  alert("Written");
};

When calling it with node externaljsfile.js on my raspberry pi it works and creates the text file.

But when including it with src in my HTML server and then calling the function save_installform() with a button, there it only shows "Step 1" as alert like coded and breaks after. No "Error" or "Written" alert and no file.

Is this a permission problem or something like that?

https://www.geeksforgeeks.org/difference-between-node-js-and-javascript/#:~:text=Javascript%20is%20a%20programming%20language,is%20a%20Javascript%20runtime%20environment.&text=Javascript%20can%20only%20be%20run,be%20run%20outside%20the%20browser. — Manos Kounelakis, Feb 01 '21 at 16:10
There is likely an error showing up in your browser's console. Press F12 or otherwise bring up your browser's Developer Tools and see what errors are showing. — Heretic Monkey, Feb 01 '21 at 16:39

score 1 · Accepted Answer · answered Feb 01 '21 at 16:18

1

fs is a library for nodejs, you cannot use it on client-side. You can lookup for some methods to do so on client, like this: How to create a file in memory for user to download, but not through server?

answered Feb 01 '21 at 16:18

Viet

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Is there a way of creating a file with javascript the same way the shown nodejs-code does? – Tim Feb 01 '21 at 20:14
@Tim no. Client side js can't have access to file system – Manos Kounelakis Feb 02 '21 at 11:03
@Tim I used this https://www.npmjs.com/package/file-saver – Viet Feb 02 '21 at 14:39
@Viet This only provides to txt to the client, not the server – Tim Feb 03 '21 at 14:35

JavaScript works when calling with Node but only particularly when calling from HTML

1 Answers1