Discuss "adding numbers" in the JavaScript Programming forum.

todd2006 · #1 July 3rd, 2008, 12:11 PM

Hi,

i have 3 textboxes I am trying to add the numbers that will entered in those textboxes

Here is my code

It gives me an error saying
document.frm1.txt1.value is null or not an object

any idea

Code:

<input type="text" name="txt1" id="txt1" onblur="callcal();" value="0">
<input type="text" name="txt2" id="txt2" onblur="callcal();" value="0">
<input type="text" name="txt3" id="txt3" onblur="callcal();" value="0">


function callcal()

{

var gettxt1=document.frm1.txt1.value;
if(gettxt1=="")
{
	gettxt1="0";
}

var gettxt2=document.frm1.txt2.value;
if(gettxt2=="")
{
	gettxt2="0";
}

var gettxt3=document.frm1.txt3.value;
if(gettxt3=="")
{
	gettxt3="0";
}

if(gettxt1=="" && gettxt2 =="" && gettxt3=="")
{
finaltotal="0"
}
else
{
finaltotal=parseInt(gettxt1) + parseInt(gettxt2) + parseInt(gettxt3) 

}

}

Rebelle · #2 July 3rd, 2008, 01:36 PM

todd2008,

here is a link to an example of what you are trying to do....it has more than what you need, just leave out the average stuff and i think it will help you.

Javascript Examples - JAVASCRIPTS: Total and Average Input Numbers

you can click run code on that page and see how it works.

jmurrayhead · #3 July 3rd, 2008, 01:38 PM

Try this:

Code:

<input type="text" name="txt1" id="txt1" onblur="callcal();" value="0">
<input type="text" name="txt2" id="txt2" onblur="callcal();" value="0">
<input type="text" name="txt3" id="txt3" onblur="callcal();" value="0">
<script language="Javascript" type="text/javascript">
function callcal()
{
var gettxt1=document.getElementById('txt1');
if(gettxt1.value =="")
{
 gettxt1="0";
}
var gettxt2=document.getElementById('txt2');
if(gettxt2.value =="")
{
 gettxt2="0";
}
var gettxt3=document.getElementById('txt3');
if(gettxt3.value =="")
{
 gettxt3="0";
}
if(gettxt1=="" && gettxt2 =="" && gettxt3=="")
{
finaltotal="0"
}
else
{
finaltotal=parseInt(gettxt1.value) + parseInt(gettxt2.value) + parseInt(gettxt3.value) 
}
}
</script>

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Discuss "adding numbers" in the JavaScript Programming forum.

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