Writing data to a local text file with javascript

I have created a procedure to write content to a text file in my local machine.

<form id="addnew">
    <input type="text" class="id">
    <input type="text" class="content">
    <input type="submit" value="Add">
    jQuery(function($) {
                id: $(this).find('.id').val(), 
                content: $(this).find('.content').val()
            return false;
        function writeToFile(data){
            var fso = new ActiveXObject("Scripting.FileSystemObject");
            var fh = fso.OpenTextFile("D:\\data.txt", 8);
            fh.WriteLine(data.id + ',' + data.content);

This is working fine, and able to append my new data to the file.

But I want to update a particular row CONTENT based on the ID which I am passing.
I searched a lot, but could not find any.

How can update a particular row in the file based on the ID?

Note:- I am not using any server as such. I have a a html file (contains all the functionality) which I will be running on my local machine itself.




<div id="addnew">
    <input type="text" id="id">
    <input type="text" id="content">
    <input type="button" value="Add" id="submit">

<div id="check">
    <input type="text" id="input">
    <input type="button" value="Search" id="search">

JS (writing to the txt file):

function writeToFile(d1, d2){
    var fso = new ActiveXObject("Scripting.FileSystemObject");
    var fh = fso.OpenTextFile("data.txt", 8, false, 0);
    fh.WriteLine(d1 + ',' + d2);
var submit = document.getElementById("submit");
submit.onclick = function () {
    var id      = document.getElementById("id").value;
    var content = document.getElementById("content").value;
    writeToFile(id, content);

checking a particular row:

function readFile(){
    var fso = new ActiveXObject("Scripting.FileSystemObject");
    var fh = fso.OpenTextFile("data.txt", 1, false, 0);
    var lines = "";
    while (!fh.AtEndOfStream) {
        lines += fh.ReadLine() + "\r";
    return lines;
var search = document.getElementById("search");
search.onclick = function () {
    var input   = document.getElementById("input").value;
    if (input != "") {
        var text    = readFile();
        var lines   = text.split("\r");
        var result;
        for (var i = 0; i < lines.length; i++) {
            if (lines[i].match(new RegExp(input))) {
                result = "Found: " + lines[i].split(",")[1];
        if (result) { alert(result); }
        else { alert(input + " not found!"); }

Put these inside a .hta file and run it. Tested on W7, IE11. It's working. Also if you want me to explain what's going on, say so.


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