Replace Zero instead of NaN...............

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Hi
I am using below function, for calculation. Only issue, is during when using input in 1st txtbox, result displays as NaN, I want to display, either Zero, or input value from 1st txtbox.

function show(TxtSTUPort, TxtAAPort, STD_NUM_OF_SERVING) 
{
    var TxtSTUPort = document.getElementById(TxtSTUPort);
    var TxtAAPort = document.getElementById(TxtAAPort);
    var STD_NUM_OF_SERVING = document.getElementById(STD_NUM_OF_SERVING);
    STD_NUM_OF_SERVING.value = (Number(parseInt(TxtSTUPort.value) + parseInt(TxtAAPort.value)));
}

Posted 8-Mar-11 4:37am

Rohit.Net100

Updated 8-Mar-11 4:40am

#realJSOP

v2

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2 solutions

Solution 2

change function like this-

C#

function show(TxtSTUPort, TxtAAPort, STD_NUM_OF_SERVING)
{
    var TxtSTUPort = document.getElementById(TxtSTUPort);
    var TxtAAPort = document.getElementById(TxtAAPort);
    var STD_NUM_OF_SERVING = document.getElementById(STD_NUM_OF_SERVING);
    var stuPort=parseInt(TxtSTUPort.value);
    var aaPort=parseInt(TxtAAPortTxtSTUPort.value);
    stuPort=isNaN(stuPort)?0:stuPort;
    aaPort=isNaN(aaPort)?0:aaPort;
    STD_NUM_OF_SERVING.value = (Number(stuPort + aaPort));
}

--Pankaj

Posted 8-Mar-11 5:47am

pankajupadhyay29

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#realJSOP · Accepted Answer · 2011-03-08T04:42:00

The problem is that you're trying to use them as if there's a valid numeric value in them. Before trying to use the values in those fields, check to see if they're NaN, and only then, do the desired math operations. In fact, I'd do this:

var TxtSTUPort = document.getElementById(TxtSTUPort);    
var TxtAAPort = document.getElementById(TxtAAPort);    
var STD_NUM_OF_SERVING = document.getElementById(STD_NUM_OF_SERVING);
var stuPort = 0;
var aaPort = 0;
var numServing = 0;

if (TxtSTUPort != null && TxtSTUPort.value != null)
{
    stuPort = TxtSTUPort.value;
}
if (TxtAAPort != null && TxtAAPort.value != null)
{
    aaPort = TxtAAPort.value;
}
if (STD_NUM_OF_SERVING != null)
{
    STD_NUM_OF_SERVING.value = stuPort + aaPort;
}

Id also take steps to ensure that the data IN the text fields is valid numeric data. I'm not big on JavaScript, but I'm sure there's code somewhere to do that (and the code above may need to be tweeked since I'm not sure if comparing against null is valid in Javascript).