How to change NaN to 0

Question

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I want to Know how to remove NaN from txtTotalAmount Textbox? Please Help

JavaScript

function CalculateTotal(objCtrl) 
{
var txtamount = parseFloat(document.getElementById('<%=txtInvoiceAmount.ClientID%>').value);
var txtother = parseFloat(document.getElementById('<%=txtOtherCharges.ClientID%>').value);
 
var total = parseFloat(txtamount+ txtother);
document.getElementById('<%=txtTotalAmount.ClientID%>').value = total;

}

Posted 4-Sep-14 19:56pm

amnk.info

Updated 4-Sep-14 20:22pm

CPallini

v2

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Comments

Sergey Alexandrovich Kryukov 5-Sep-14 2:25am

Please, be more precise. Do you see some double of float value NaN (say, in the debugger), or do you see the string "NaN" somewhere.
Do you know this value, double.NaN (not a number) and its meaning? It can come in calculations or directly assigned to a double (float) variable/member.
—SA

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CPallini · Accepted Answer · 2014-09-04T20:27:00

Solution 1

Use the isNaN[^] function, namely:

JavaScript

if (isNaN(total)) total = 0;

Posted 4-Sep-14 20:27pm

CPallini

Comments

Sergey Alexandrovich Kryukov 5-Sep-14 2:32am

5ed, but OP's problem is more of a problem of understanding.
I tried to explain the matter in Solution 2.
—SA

amnk.info 5-Sep-14 3:14am

Thanks CPallini it works (Y)

CPallini 5-Sep-14 3:34am

You are welcome.

Sergey Alexandrovich Kryukov · Accepted Answer · 2014-09-04T20:31:00

Please see my comment to the question.

NaN (not a number) is one of the legitimate values added to the domain of the floating-point type, to denote "not a number" result of some calculations, such as division 0.0/0.0 (it does not cause exception but returns NaN). This is the part of the IEEE-754 standard. Please see:
http://en.wikipedia.org/wiki/Floating_point[^],
http://en.wikipedia.org/wiki/IEEE_754[^].

The question is not 100% clear, but one source of such value is the Javascropt call parseFloat(string). It will return NaN is the string cannot be interpreted in a numeric format. Please see: http://www.w3schools.com/jsref/jsref_parsefloat.asp[^].

—SA