如何将NaN更改为0 [英] How to change NaN to 0

问题描述

我想知道如何从txtTotalAmount文本框中删除NaN？请帮助

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

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;

}

推荐答案

使用 isNaN [ ^ ]函数，即：

Use the isNaN[^] function, namely:

if (isNaN(total)) total = 0;

请看我对这个问题的评论。



NaN（不是数字）是添加到浮点类型域的合法值之一，表示某些计算的非数字结果，例如除法0.0 / 0.0（它不会导致异常）但返回NaN）。这是IEEE-754标准的一部分。请参阅：

http://en.wikipedia.org/wiki/Floating_point [< a href =http://en.wikipedia.org/wiki/Floating_pointtarget =_ blanktitle =New Window> ^ ]，

http://en.wikipedia.org/wiki/IEEE_754 [ ^ ]。



问题不是100％明确，而是一个这样的问题来源value是Javascropt调用 parseFloat（string）。它将返回NaN是不能以数字格式解释的字符串。请参阅： http://www.w3schools.com/jsref/jsref_parsefloat.asp [ ^ ]。

-SA

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

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