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@veekram

veekram/read-write-file.js

Created June 1, 2018 11:12
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Read Write to file with javascript
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read-write-file.js
/// write to file
var txtFile = "c:/test.txt";
var file = new File(txtFile);
var str = "My string of text";
file.open("w"); // open file with write access
file.writeln("First line of text");
file.writeln("Second line of text " + str);
file.write(str);
file.close();
/// read from file
var txtFile = "c:/test.txt"
var file = new File(txtFile);
file.open("r"); // open file with read access
var str = "";
while (!file.eof) {
// read each line of text
str += file.readln() + "\n";
}
file.close();
alert(str);
////////////////////////////////////////////////////
/**
* writeTextFile write data to file on hard drive
* @param string filepath Path to file on hard drive
* @param sring output Data to be written
*/
function writeTextFile(filepath, output) {
var txtFile = new File(filepath);
txtFile.open("w"); //
txtFile.writeln(output);
txtFile.close();
}
////////////////////////////////////////////////////
/**
* readTextFile read data from file
* @param string filepath Path to file on hard drive
* @return string String with file data
*/
function readTextFile(filepath) {
var str = "";
var txtFile = new File(filepath);
txtFile.open("r");
while (!txtFile.eof) {
// read each line of text
str += txtFile.readln() + "\n";
}
return str;
}
////////////////////////////////////////////////////
// Great parse examples with result to process file
// http://www.w3schools.com/jsref/jsref_parseint.asp
// var a = parseInt("10"); // 10
// var b = parseInt("10.00"); // 10
// var c = parseInt("10.33"); // 10
// var d = parseInt("34 45 66"); // 34
// var e = parseInt(" 60 "); // 60
// var f = parseInt("40 years"); // 40
// var g = parseInt("He was 40"); // NaN
//
// var h = parseInt("10",10); // 10
// var i = parseInt("010"); // 10
// var j = parseInt("10",8); // 8
// var k = parseInt("0x10"); // 16
// var l = parseInt("10",16); // 16
// http://www.w3schools.com/jsref/jsref_parsefloat.asp
// var a = parseFloat("10"); // 10
// var b = parseFloat("10.00"); // 10
// var c = parseFloat("10.33"); // 10.33
// var d = parseFloat("34 45 66"); // 34
// var e = parseFloat(" 60 "); // 60
// var f = parseFloat("40 years"); // 40
// var g = parseFloat("He was 40"); // NaN
@Blyzz616
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Blyzz616 commented Apr 13, 2021 •
edited
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Hi there Veekram,
I'm trying to write a file to a linux system. I tried your code (modified) and it doesnt' seem to do anything. Any Idea how I can get it working?

Here's what I used:

<html>
  <head>
  </head>
  <body>
    <script>
      var txtFile = "/tmp/testing.txt";
      var file = new File(txtFile);
      var str = "My string of text";
 
      file.open("w"); // open file with write access
      file.writeln(str);
      file.write(str);
      file.close();
    </script>
<h1>some text</h1>
  </body>
</html>

@minaschar
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you are wrong, this doesn't work

@darksidebug
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I did try your way but unfortunately, the new File doesn't work. how did you make it work?

@EntityPlantt
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I'm curious, can I use this code for reading and writing files on a website like my Github site?
The problem it doesn't work for local files is that Google Chrome and other browsers, for security options, don't want to run that code.

@veekram
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Author

veekram commented Nov 1, 2021

I'm curious, can I use this code for reading and writing files on a website like my Github site? The problem it doesn't work for local files is that Google Chrome and other browsers, for security options, don't want to run that code.

I am not sure what i used this script actually for. Sorry about that -_-

@EntityPlantt
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Ok, thanks 😀

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