How to multiply two decimals of type string javascript

Question

I want to multiply these two values of type string

values 1 = "$10.99"

values 2 = "$20.8"

var x = document.getElementById("Text1");
var y = document.getElementById("Text2");
var tointx = x.Value
var tointy = y.Value
var z = tointx * tointy
var result = z.reduc((r, e) => r + +e.replace(',', '.'), 0)
alert(result);

<input id="Text1" value="$10.99" />

<input id="Text2" value="$20.8" />

Possibly helpful and related [Currency Math in JavaScript](https://stackoverflow.com/questions/2556338/currency-math-in-javascript) — chickity china chinese chicken, Oct 23 '21 at 21:00
I see a JavaScript error: "Uncaught TypeError: z.reduc is not a function". — showdev, Oct 23 '21 at 21:02

score 3 · Answer 1 · answered Oct 23 '21 at 21:03

Several things

.value JS is case sensitive
$ sign needs to go
reduce is misspelled too but not needed
Are you sure you want ints?

const x = document.getElementById("Text1").value;
const y = document.getElementById("Text2").value;
let tofloatx = +x.slice(1); // unary plus will convert to number but so will multiplication
let tofloaty = +y.slice(1)
let z = tofloatx * tofloaty
console.log("float",z,"int",Math.round(z))

<input id="Text1" value="$10.99" />

<input id="Text2" value="$20.8" />

score 2 · Accepted Answer · answered Oct 23 '21 at 21:09

2

Is this what you needed?

let x = "$10.99"
let y = "$20.8"
let moneyToNb = function(money) {return Number(money.replace("$",""))}
let intX = moneyToNb(x)
let intY = moneyToNb(y)
let z = Math.floor(intX*intY)
console.log(z);

answered Oct 23 '21 at 21:09

Jip Helsen

1,034
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1

Explanation would be helpful. What was wrong and how did you solve it? – showdev Oct 23 '21 at 22:06

score 2 · Answer 3 · answered Oct 23 '21 at 22:17

2

multiplyFields();

function multiplyFields( ) {
 var x = Text1.value,
     y = Text2.value,
     z = x.match( /[0-9.]+/ ) * y.match( /[0-9.]+/ );

    alert( z );
}

<input id=Text1 value=$10.99 >
<input id=Text2 value=$20.80 >

answered Oct 23 '21 at 22:17

Bekim Bacaj

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How to multiply two decimals of type string javascript

3 Answers3