adding numbers together

Hi Does anyone know what i'm doing wrong here. Instead of adding my numbers together its putting them next to each other?

This is the javascript...

Code:

---

<SCRIPT LANGUAGE="JavaScript">

<!--
var myIncome1;
var myIncome2;
var myIncome3;
var myIncome4;


function HowMany(form)
{
var totalincome;
totalincome = (myIncome1 + myIncome2 + myIncome3 + myIncome4);
form.Tincome.value = totalincome;
}

function SetMyIncome1(inc1)
{
myIncome1 = inc1.value;
}

function SetMyIncome2(inc2)
{
myIncome2 = inc2.value;
}

function SetMyIncome3(inc3)
{
myIncome3 = inc3.value;
}

function SetMyIncome4(inc4)
{
myIncome4 = inc4.value;
}

function ClearForm(form){

form.myIncome1.value = "";
form.myIncome2.value = "";
form.myIncome3.value = "";
form.myIncome4.value = "";
form.Tincome.value = "";


}


// -->

</SCRIPT>

---

This is the form...

Code:

---

<div><form method="Post">
<div><p>Monthly income</p></div>
<div><p>Pay <input name="myIncome1" type="text" ONCHANGE="SetMyIncome1(this)"/></p>
<p>Benefits <input name="myIncome2" type="text" ONCHANGE="SetMyIncome2(this)"/></p>
<p>Pension <input name="myIncome3" type="text" ONCHANGE="SetMyIncome3(this)"/></p>
<p>Other income <input name="myIncome4" type="text" ONCHANGE="SetMyIncome4(this)"/></p>
<p><INPUT TYPE=BUTTON ONCLICK="HowMany(this.form)" VALUE="Calculate Income"><INPUT TYPE=BUTTON VALUE=" Reset " onClick="ClearForm(this.form)"></p>


<p>Total <input name="Tincome" type="text" value="" /></p></div></form

---

Fixed it....

Code:

---

totalincome = parseFloat(form.myIncome1.value)+parseFloat(form.myIncome2.value)+parseFloat(form.myIncome3.value)+parseFloat(form.myIncome4.value);

---

Does anyone know how to set the value to 0 if they don't enter a value? I get NaN if they miss a box but dont want to put a check form on as they dont have to fill out all the boxes.

if (isNaN(blah))
blah=0;

thank you :-)

javascript can be very had to debug sometimes due to the lack of detailed error messages.

+ is the default string concatenation function, unless you specifically cast your vars as number types, + will treat them as if they are strings.

Michael G. Workman
michael.g.workman@gmail.com

thanks, it took me a while but I figured it out. I'm getting used to it a bit now but its very complicated!! :-)