Error with adding two strings in JavaScript

Question

I have the following error:

jquery-3.4.1.min.js:2 The specified value "24.164.83" is not a valid number. The value must match to the following regular expression: -?(\d+|\d+.\d+|.\d+)([eE][-+]?\d+)?

Code

var grossTotal = netPrice * vatTotal // Is OK - it multiplies values

but

var grossTotal = netPrice + vatTotal // It makes this error -

it doesn’t sum.

One is a string, other one is a number or both are strings. Try debugging your code, with given info you're not going to get much help. — Adrian, Dec 05 '19 at 13:29
check type of both variables im sure that they are not same type thats why — Wassim Ben Hssen, Dec 05 '19 at 13:30
What are `netTotal` and `vatTotal`? Where are they defined? How are they computed? — Alex Walker, Dec 05 '19 at 13:32
The problem is very likely in the values of the variables, and so in the lines before the (very short) code sample you're giving. — boisvert, Dec 05 '19 at 13:37

score 1 · Answer 1 · answered Dec 05 '19 at 13:33

1

The easiest way to produce a number from a string is prepend with +

var grossTotal= +netPrice + +vatTotal;

answered Dec 05 '19 at 13:33

Wassim Ben Hssen

519
6
23

score 0 · Answer 2 · answered Dec 05 '19 at 13:34

0

Try this code:

var netPrice = 1.432;
var vatTotal = 14.423;
var grossTotal = parseFloat(netPrice) + parseFloat(vatTotal)// Change according to data type of netPrice and/or vatTotal
console.log(grossTotal);

answered Dec 05 '19 at 13:34

uday8486

1,203
2
13
22

score 0 · Answer 3 · answered Dec 05 '19 at 13:36

0

Try with type conversion:

 var answer = parseInt(netPrice ) + parseInt(vatTotal);

answered Dec 05 '19 at 13:36

Pergin Sheni

393
2
11

Shafiqul Islam · Answer 4 · 2019-12-05T13:41:44.013

You can use this code, First format value using parseFloat

 var netPrice = 2.3777;
 var vatTotal = 1.3777;
 var grossTotal = parseFloat(netPrice ) + parseFloat(vatTotal);
 console.log(grossTotal);

     var netPrice = 2;
     var vatTotal = 1;
     var grossTotal = parseInt(netPrice ) + parseInt(vatTotal);
     console.log(grossTotal);

For more information about parseFloat

https://www.w3schools.com/jsref/jsref_parsefloat.asp

Error with adding two strings in JavaScript

Code

4 Answers4