Why do I keep getting NaN as my answer

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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

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3 solutions

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Peter Leow · Answer 1 · 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

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

mudgilsks · Answer 3 · 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