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Unable to change a value inside a variable?

I am currently working on a project that I took over with the input reads from a barcode, currently iam having trouble with my output giving me a fix value which the code reads from and does not read from the actual input.
below is the html code for the scanner. it reads fine
<div class="section" id="instruction-3">
<p>Otherwise, scan your code at the bottom, or manually type it in here:</p>
<span>
<input type="text" id="IC-input" name="IC" onclick="openKeyboard()" onkeyup="autofill(this.value)" placeholder="Enter your IC Number" required maxlength="9">
<label><button type="button" id="theButton" onclick="theButtonIsPressed()">Submit</button></label>
</span>
</div>
follow by the javascript (which i suspect is where the problem lies but am not sure)
<script>
var NRIC = '{"NRIC":"0"}';
function theButtonIsPressed(){
closeKeyboard();
console.log('button clicked');
NRIC = '{"NRIC":"123456789"}';
//var IcNum = document.getElementById("IC-input").value;
//NRIC = NRIC.replace("0", IcNum);
document.getElementById("IC-input").value = "";
doWork(NRIC)
}
</script>
function doWork(NRIC) {
// ajax the JSON to the server
$.post("receiver", NRIC, function(){
});
// stop link reloading the page
function update() {
setInterval(function(){$.post("receiver", '{"NRIC":NRIC}', function(){});}, 900);
It keeps giving me the value inside NRIC = '{"NRIC":"123456789"}'; which is 123456789, i realize this might be a simple fix but i am still learning and am unsure.
thank you in advance.

If I correctly understanded you want to have in the obj the input value, so try this:
function theButtonIsPressed(){
closeKeyboard();
console.log('button clicked');
var IcNum = document.getElementById("IC-input").value;
NRIC.NRIC = IcNum;
doWork(NRIC)
}

Why quotes around an object?
var NRIC = {"NRIC": 0};
function theButtonIsPressed() {
NRIC = {"NRIC": 123456789};
doWork(NRIC)
}

all but I have solved the problem, it was my fault that I did not mention I wanted to transfer the data to another webpage, and the problem with that was that the data was not transferred over to the other html.
function autofill(value){
console.log("Autofill:"+value)
//console.log(9 digits);
button = document.getElementById("theButton");
if(value.length == 9){
console.log('form is ready to submit');
theButtonIsPressed(value);
}
}
function theButtonIsPressed(value){
closeKeyboard();
console.log('button clicked');
//NRIC = '{"NRIC":"123456789"}';
console.log(value)
doWork(value)
}
by doing this it read the value as accordingly from the input and worked after, sorry again for my confusing question and thanks to everyone who tried to help.

Manipulate value dynamically (onchange) from span to input?

I am developing a form which has an input called "net worth" and I have an embedded widget below this input which you can choose your currency and insert your budget and it would convert it to your desired currency. it looks like this:
You can check online the widget here.
So I want whenever the result changes (onChange) my input field value changes too. The result is in the span with #result-fit ID and my input box is #netWorthValue ,
I have searched a lot and try some best practice but still, I can not figure it out. The most relevent question in Stackoverflow was this question but it couldn't help me unfortunately, I have tested this code and it didn't retrieve the value from span (maybe because it is inside an embedded form?)
var value = $("#result-fit").text();
var lower = $("#netWorthValue").val(value);
alert(lower.val());
var value = $("#result-fit").text();
var lower = $("#netWorthValue").val(value);
alert(lower.val());
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<p>Your personal net worth</p>
<div class="input-group">
<label>Amount in CDN (Canadian dollar):</label> <input type="number" class="form-control" name="netWorth" title="networth" id="netWorthValue">
<!-- START CODE Attention! Do not modify this code; -->
<script>
var fm = "EUR";
var to = "CAD";
var tz = "timezone";
var sz = "1x1";
var lg = "en";
var st = "info";
var lr = "0";
var rd = "0";
</script>
<a href="https://currencyrate.today/converter-widget" title="Currency Converter">
<script src="//currencyrate.today/converter"></script>
</a>
</div>

Listen for changes to the input and write to the '#result-fit' span.
$(document).ready(function(){
$("#result-fit").on("change", function(e){
$("#netWorthValue").text($(this).val());
})
})

How do I wait for input to be filled in an html page and then print it's value to the console in javascript?

I have a HTML page with an input field
Someone enters some text into it
They click a button
I want to grab the value of the input field AFTER they click the button with some JS code(client-side) and then print it to the console/save it to a file.
How would I go about doing this?
I've tried looking but I can't find anything like this at all :/
Thanks! :)

This example should help you to achieve your goals.
const inputNode = document.getElementById('input');
const buttonNode = document.getElementById('button');
buttonNode.addEventListener('click', () => {
const inputValue = inputNode.value;
// do what ever you wan't
});
<input id="input" type="text" />
<button id="button">Click</button>

Try this:
// This function is called by the HTML code onclick on the button
var get_content_of_input = function(){
var user_input = document.getElementById("text_field").value;
// Now you can use the variable user_input containing the text
}
<input id="text_field">Please enter Text</input>
<button id="button" onclick="get_content_of_input()">Click here to sumbit</button>
The content of the text field will now be saved in the variable "user_input".

JavaScript issue passing value across pages

I have this JavaScript code that processes and displays the value onto the same page; the value is entered using a textbox. I want to pass this value onto another page. this my code:
index.html:
<form action="display.html" method="post" id="name-form">
<p>
<label>Your full Name</label>:<br />
<input type="text" name="fullName">
</p>
<p>
<input type="submit" value="Submit">
</p>
</form>
<!-- <p id="result"></p>-->
<script>
var form = document.getElementById('name-form');
form.onsubmit = function (e) {
e.preventDefault();
var result = document.getElementById('result');
result.innerHTML = 'Hi ' + form.fullName.value;
console.log(form.fullName.value);
this.reset();
};
</script>
display.html
<p id="result"></p>
<script>
var form = document.getElementById('name-form');
form.onsubmit = function (e) {
e.preventDefault();
var result = document.getElementById('result');
result.innerHTML = 'Hi ' + form.fullName.value;
console.log(form.fullName.value);
this.reset();
};
</script>
my question is how do I get the value that is entered into the textbox to display onto another page?

If you have a static website, you should consider storing that value in localStorage. So that value will be available all across your web pages.
And if you have a dynamic website you can store that value in db and then request db for that value when you're on some other page.
Choose anyone of the approaches that fits in your case and application.
Read here about localStorage

Use cookies.
Save the name: document.cookie = "name=" + name
Load the name: name = document.cookie.replace(/(?:(?:^|.*;\s*)name\s*\=\s*([^;]*).*$)|^.*$/, "$1");
See here for a simpler way to load cookies

I want to join two inputs in one var at html on Wordpress

I'm using wordpress but making my own form for payments, i have two inputs of type select, like this:
<div id="S03" class="Selectos"><select tabindex="4" name="Mes" required="">
<option...[Code goes on]
And this:
<div id="S04" class="Selectos"><select tabindex="5" name="Ano" required="">
<option...[Code goes on]
Those works fine, but i want to join them in one input, i have research all day long, i found some clues about what i have to do, but in especifics no one does help me.
This is the input for the joining:
<input id="Expires" name="Expires" type="hidden" />
And the way i call the form:
<div class="container"><form id="contact" class="RV_donateForm" action="https://eps.banorte.com/secure3d/Solucion3DSecure.htm" method="post">
And how it close:
<fieldset><button id="contact-submit" name="submit" type="submit" data-submit=" ">Donar</button></fieldset>
</form></div>
Then i look for some way to joining and this one looks the better way to do it at the submit event:
<script type="text/javascript">
button.onclick = function (){
document.getElementById('Expires').value = document.getElementById('S03').value + '/' + document.getElementById('S04').value; cn = document.getElementById('Expires').value ;
alert(cn);
};
</script>
Well, at the bank 'post' they throw me all the vars ok, except for Expires that never joins and shows null, and i notice also because it never show me the alert. I'm new at html and JavaScript, and i'm not sure what could be wrong. All the code on the file are on this order for exception that the call of the form is at the beginning of everything, ¿maybe is the position on line that i have to put the javascript?
I appreciate any help. Thanks a lot stackfellas!

You may want to check this https://developer.mozilla.org/es/docs/Web/API/EventTarget/addEventListener
I guess you first need to get the button, then add the listener
<script type="text/javascript">
var button = document.getElementById('contact-submit')
button.addEventListener('click', function () {
document.getElementById('Expires').value = document.getElementById('S03').value + '/' + document.getElementById('S04').value;
cn = document.getElementById('Expires').value ;
alert(cn);
});
</script>

Finally! It does work like Omar says, but loading the addEventListener at onload body function, it will run the function that the event refers when you click on submit button.
<script type="text/javascript">
function putExpires(){
var cm = document.getElementById('S03').value;
var ca = document.getElementById('S04').value;
document.getElementById("Expires").value = cm + '/' + ca;
var cn = document.getElementById("Expires").value;
}
function load() {
var button = document.getElementById("contact-submit");
button.addEventListener("click", function(){putExpires()}, false);
}
</script>
<body onload="load();">
Thanks Omar!