How to remove NaN From textbox in Javascript

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I'm having two textboxes Textbox1 and Texbox2 and onkeyup event i'm adding +1 in Textbox1's Value. and Printing it In Textbox2 But if i blank textbox1's value then in Textbox2,showing NaN.
i want to remove NaN. can anybody give suggestions about it?Thanks in Advance.

Posted 7-May-13 2:55am

Surendra0x2

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KM Perumal 7-May-13 9:01am

Show ur script

Surendra0x2 7-May-13 9:24am

function addyear()
{

var yr=parseInt(document.getElementById("<%=TextBox1.ClientID %>").value);

document.getElementById("<%=TextBox2.ClientID %>").value=yr+1;

}

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skantg · Answer 1 · 2013-05-07T03:06:00

Solution 1

NaN (not a number) is showing up because in this case you are trying to add numeric and non-numeric (blank) values.

in javascript code where you are adding up, just check the text box value and do the addition only if it is not blank.

hope this helps

Posted 7-May-13 3:06am

skantg

Comments

CPallini 7-May-13 9:09am

simplex et unum: 5.

Thanks7872 7-May-13 11:37am

upvoted.!

Style-7 · Answer 2 · 2013-05-07T06:26:00

Solution 2

Use function isNaN( number );

See example of my function

function CheckInt( num, min, max ){
if( isNaN( num ) ){
return false;
}else{
num = parseInt( num );
return min <= num && num <= max;
}
}

Posted 7-May-13 6:26am

Style-7