Why do I keep getting NaN as my answer

Question

0.00/5 (No votes)

See more:

I don't know what part I got wrong I keep getting

JavaScript

NaN

Please tell me what part is not right.

JavaScript

function grandtotal(){
    var x = document.getElementById("st").value;
    var y = document.getElementById("shppng").value;
    
    var sum = parseFloat(x, 10)+ parseFloat(y, 10);
    $('#gt').val(sum.toFixed(2));
}

Posted 8-Dec-14 19:37pm

missMarie

Add a Solution

3 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

mudgilsks · Answer 1 · 2014-12-08T19:40:00

Solution 1

hi,

check the output coming from x and y variable.

Is the correct value to perform arithmetic operations.

it may be null value or "" or undefined

Posted 8-Dec-14 19:40pm

mudgilsks

Comments

missMarie 9-Dec-14 2:38am

i have a value="" like that in one of my codes, because it's value depends on a dropdown menu. so what will i do now?

mudgilsks 9-Dec-14 2:40am

when you adding value consider '' as 0
take value in variable ,check if they '' when 0 then add values

Ravimallya · Answer 2 · 2014-12-08T19:53:00

Solution 2

Your code is working fine. You can check it at: JsFiddle Link[^] If the code is still not working, please give us a demo page.

Posted 8-Dec-14 19:53pm

Ravimallya

Peter Leow · Answer 3 · 2014-12-08T19:58:00

Solution 3

You should validate that both x and y are number string before attempting any number conversion and arithmetic operation, e.g.

C#

var sum = 0;
if(isNaN(x) || isNaN(y)){
       alert('not a number');
} else {
       sum = parseFloat(x) + parseFloat(y);
}

Posted 8-Dec-14 19:58pm

Peter Leow