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How to get the first 3 digits from a cell

So I have got a column and i want to get the first 3 digits only from it and store them in a function called wnS using the split function or any other method that would work. I want to get the first three digits before "_"
I tried doing this but it didn't work, and I also kept getting "TypeError: wnC.split is not a function"
var ssh = ssPO.getSheetByName("PO for OR (East).csv")
wnC = ssh.getRange("N2:N");
var wnS = wnC.split("_");
I would really appreciate an answer
If you need more info please let me know
Thank you.

After you define range, you have to get the values.
function first_3_digs (){
var ssh = ssPO.getSheetByName("PO for OR (East).csv")
var wnC = ssh.getRange("N2:N");
var values = wnC.getValues();
const first_3_digs = values.filter(r => {
if(r.toString().includes('_')){return r;}
}).map(r=> r.toString().split('_')[0]);
console.log(first_3_digs)
}

const cell = "(303) 987-4567";
const first3 = cell.match(/\d{3}/)[0];
//result:303
String method match()
regular expression
BTW: you can test methods like this very easily in the console.log in the browsers developer tools.

From .txt data give values to inputs

I'm trying to fill some inputs when you load a page, using the data I have from a .txt file. This file has a list of numbers
1
2
3
Something like this. So I wanted to read this lines and put them in their corresponding input. Suggestions on how to do this??
I tried with this code, but maybe I have a mistake that I don't know about, I'm starting with javascript.
function loadvalues()
{
var fso = new ActiveXObject("Scripting.FileSystemObject");
var s = fso.OpenTextFile("E://Steelplanner/Demand_Routing/Pruebas/OrderBalancing_Masivos/ModificaFechaTope/DueDate/Datosactuales.txt", true);
var Ia5 = document.getElementById("Ia5sem");
var text = s.ReadLine();
Ia5.value = text;

Try using file.ReadLine() until document not completely read using while loop with AtEndOfStream of file variable.
Here is example you can refer: ReadLine Method
Don't forget to replace TextFile path to your own text file path
My text file contains same data as in your example
<script type="text/javascript">
var fso = new ActiveXObject("Scripting.FileSystemObject");
//specify the local path to Open and always add escape character else throw error for bad file name
var file = fso.OpenTextFile("C:\\Users\\MY_USER\\Desktop\\txtfile.txt", 1);
var Ia5 = document.getElementById("Ia5sem");
while (!file.AtEndOfStream) {
var r = file.ReadLine();
Ia5.innerHTML = Ia5.innerHTML + ("<br />" + r);
}
file.Close();
</script>
<p id="Ia5sem">HI</p>

So, I don't know why, but I just changed the name of the variables and made a slight change in the .OpenTextFile line and it worked.
function loadvalues()
{
var file = new ActiveXObject("Scripting.FileSystemObject");
var text = file.OpenTextFile("E:\\Steelplanner\\Demand_Routing\\Pruebas\\OrderBalancing_Masivos\\ModificaFechaTope\\DueDate\\Datosactuales.txt", 1,false);
var Ia5s = document.getElementById("Ia5sem");
Ia5s.value = text.ReadLine();
var Ia4s = document.getElementById("Ia4sem");
Ia4s.value = text.ReadLine();
text.close();
}
Anyways, I'm gonna check the FileReader() for future references and the script #Sarjan gave, maybe I can improve it, but I have other things to finish. Thanks for everything.

d3.format thousand separator on variables?

Hello I'm yet again stuck on d3...
I'd like to know how to use a thousand seperator on a variable all the examples I've managed to find seem to be on static data.
This is what I've tried so far:
d3.csv("OrderValueToday.csv", function(obj) {
var text = 'Today = £';
var totalSales = text + d3.format(",") + obj[0].Today;
svgLabel = d3.select("#label").append("h2")
.text (totalSales);
});
However it just outputs a load a stuff on the webpage this is it:
Today = £function (n){var e=d;if(m&&n%1)return"";var u=0>n||0===n&&0>1/n?(n=-n,"-"):a; if(0>p){var c=Zo.formatPrefix(n,h);n=c.scale(n),e=c.symbol+d}else n*=p;n=g(n,h);var x=n.lastIndexOf("."),M=0>x?n:n.substring(0,x),_=0>x?"":t+n.substring(x+1);!s&&f&&(M=i(M));var b=v.length+M.length+_.length+(y?0:u.length),w=l>b?new Array(b=l-b+1).join(r):"";return y&&(M=i(w+M)),u+=v,n=M+_,("<"===o?u+n+w:">"===o?w+u+n:"^"===o?w.substring(0,b>>=1)+u+n+w.substring(b):u+(y?n:w+n))+e}20000
So all I want is to be able to make the totalSales value have thousand separators so like 20,000 everything else I've tried doesnt do anything. I've read this https://github.com/mbostock/d3/wiki/Formatting but didnt see what I could do for my scenario.
Any help would be greatly appreciated. Cheers

Specifying a d3.format returns a formatting function, which you must then call as a function, passing in the number to be formatted as an argument:
var myNumber = 22400;
d3.format(',')(myNumber); // returns '22,400'
Sometimes you will see a format function stored as a variable like this:
var commaFormat = d3.format(',');
commaFormat(1234567); // returns '1,234,567'
In your case, you could do the following:
var totalSales = text + d3.format(',')(obj[0].Today);

How can I write data in a single line on text file using javascript

I am trying to write data in a .txt file using JavaScript function.
My function :-
function WriteToFile()
{
var fso = new ActiveXObject("Scripting.FileSystemObject");
var s = fso.CreateTextFile("test.txt", true);
for(var j=1;j<9;j++)
{
if(document.getElementById('chk'+j).checked)
{
s.WriteLine(' ');
s.WriteLine(document.getElementById('item'+j).innerText);
s.WriteLine(',');
s.WriteLine(document.getElementById('txtBx'+j).value);
s.WriteLine(',');
s.WriteLine(document.getElementById('txtBxx'+j).value);
s.WriteLine(';');
}
}
alert("written");
s.Close();
}
Now the problem is that data being written on a new line.
(maybe because i am using s.WriteLine ?)
I want all the data to be written in a single line. how can i achieve this?
to elaborate more, my current output looks like this
abc
,
1
,
cdf
;
def
,
3
,
ehi
;
I want it like this-
abc,1,cdf;def,3,ehi;

Use s.write() instead of s.writeLine(). As the name implies, the second function is for writing whole lines, and it adds a newline after it.

Just add everything to a variable then write the line.
var st = document.getElementById('item'+j).innerText;
st += ','
st += document.getElementById('txtBx'+j).value;
s.WriteLine(st);

Finding the difference between two fields using JavaScript in iText

I would like to find difference between two fields using JavaScript in iText.
I am able to find the sum of them using below code:
PdfStamper stamperResult = new PdfStamper(readersectionResult, new FileOutputStream(RESULT_NEW));
stamperResult .addJavaScript("var nameField = this.getField(\"total\");"+ "nameField.setAction(\"Calculate\",'AFSimple_Calculate(\"SUM\",\"total1\", \"total2\")')");
Is there any way to find the difference using 'AFSimple_Calculate' similar to what I did in the above code snippet?
Thanks for editing! I tried your suggestion but it does not seem to work for some reason.
stamperResult.addJavaScript(" var total1 = this.getField(\"value1\"); var total2 = this.getField (\"value2\"); var subtr = this.getField(\"total\"); subtr.value = total1.value - total2.value;");
I separated newlines by spaces and added right escape characters.
I was also thinking of using a different logic for subtraction using AF methods : like this
stamperResult.addJavaScript("var nameField = this.getField(\"total\");"+ "nameField.setAction(\"Calculate\",'AFSimple_Calculate(\"SUM\",\"total1\", \"-total2\")')");
In the above code I was trying to add -(negative value) to total 2 so that it will be subtracted from total1 though the AF method is still 'SUM'.
But that does not work.
The below simple code seem to work :
stamperResult.addJavaScript("var nameField = this.getField('total');" +
"nameField.setAction('Calculate'," +
"'subtract()');" +
"" +"function subtract(){this.getField('total').value
= (this.getField('total_1').value -this.getField('total_2').value); }");

I updated your question because it contained many spelling errors. I didn't edit the code snippet because I don't know what the original code snippet is like. In any case: I think something went wrong during the copy/paste process, as I don't think your code snippet compiles in its current state.
In any case: as far as I know the AF-methods (the AF stands for Adobe Forms) may not be present in every viewer, and as far as I know Adobe didn't implement a way to subtract values from each other in the AFSimple_Calculate method.
For these two reasons, you may prefer regular JavaScript instead of using a pre-canned function that may or may not be pre-canned.
This regular JavaScript may look like this:
var total1 = this.getField("total1");
var total2 = this.getField("total2");
var subtr = this.getField("difference");
subtr.value = total1.value - total2.value;
I'm not sure if that answers your question. Maybe you just want:
var total1 = this.getField("total1");
var total2 = this.getField("total2");
var namefield = total1.value - total2.value;
You can put these lines inside a String using the right escape characters and replacing the newlines by spaces or newline characters.
Of course, you need to trigger this code somewhere. Below you'll find an example that puts the negative value of the content of a value1 field into a value2 field.
public static void main(String[] args) throws IOException, DocumentException {
Document document = new Document();
PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("js.pdf"));
document.open();
writer.addJavaScript("function makeNegative() { this.getField('value2').value = -(this.getField('value1').value); } ");
Rectangle rect1 = new Rectangle(40, 740, 200, 756);
TextField value = new TextField(writer, rect1, "value1");
value.setBorderColor(GrayColor.GRAYBLACK);
value.setBorderWidth(0.5f);
PdfFormField field = value.getTextField();
field.setAdditionalActions(PdfName.BL, PdfAction.javaScript("makeNegative();", writer));
writer.addAnnotation(field);
Rectangle rect2 = new Rectangle(40, 710, 200, 726);
TextField neg = new TextField(writer, rect2, "value2");
neg.setBorderColor(GrayColor.GRAYBLACK);
neg.setBorderWidth(0.5f);
writer.addAnnotation(neg.getTextField());
document.close();
}
Note that I used a Blur action. This means the method will be triggered as soon as you select another field after filling out the value1 field.