I thought this would be easy - HELP

[EJ]

var theSel = document.forms['price'].elements['cpu'];

var theVal = theSel.options[theSel.selectedIndex].value;
var theSli = theVal.slice(1,3);

this doen't seem to work

var cpus = document.forms['price'].elements['cpu'];
var cpusx = cpus.options[cpus.selectedIndex].value;
var cpusxd = cpusx.slice(8,10);

when I use the event handler

onchange="document.forms['price'].value=cost(cpusxd,shpsxd)"

I get the error message: "cpudsx undefined

[Jim Land]

"EJ" <jo********@hotmail.comwrote in news:1174703621.570832.232670
@o5g2000hsb.googlegroups.com:

>var theSel = document.forms['price'].elements['cpu'];
var theVal = theSel.options[theSel.selectedIndex].value;
var theSli = theVal.slice(1,3);

this doen't seem to work

var cpus = document.forms['price'].elements['cpu'];
var cpusx = cpus.options[cpus.selectedIndex].value;
var cpusxd = cpusx.slice(8,10);

when I use the event handler

onchange="document.forms['price'].value=cost(cpusxd,shpsxd)"

I get the error message: "cpudsx undefined

Check your spelling: ( cpusxd vs. cpudsx ) One of the limitations of
variable names you can't pronounce.

Also, your onchange code lacks any mention of which element in the form
you want to change the value.

[Jim Land]

"EJ" <jo********@hotmail.comwrote in news:1174703621.570832.232670
@o5g2000hsb.googlegroups.com:

>var theSel = document.forms['price'].elements['cpu'];
var theVal = theSel.options[theSel.selectedIndex].value;
var theSli = theVal.slice(1,3);

this doen't seem to work

var cpus = document.forms['price'].elements['cpu'];
var cpusx = cpus.options[cpus.selectedIndex].value;
var cpusxd = cpusx.slice(8,10);

when I use the event handler

onchange="document.forms['price'].value=cost(cpusxd,shpsxd)"

I get the error message: "cpudsx undefined

Put everything in a function. The variables cpus, cpusx, cpusxd must be
evaluated after the onchange event happens.

function myFunc = {
var cpus = document.forms['price'].elements['cpu'];
var cpusx = cpus.options[cpus.selectedIndex].value;
var cpusxd = cpusx.slice(8,10);
document.forms['price'].elements['something'].value=cost(cpusxd,shpsxd)
}

onchange = "myFunc();"

[EJ]

On Mar 24, 1:10 am, Jim Land <rrrrfffftttt(no)@(spam)hotmail.com>
wrote:

"EJ" <[e-mail] in news:1174703621.570832.232670
@o5g2000hsb.googlegroups.com:

Put everything in a function. The variables cpus, cpusx, cpusxd must be
evaluated after the onchange event happens.

thanks, but why?

also you wrote:

Are you trying to insert the sum into the hidden element?

document.forms['price'].elements['amount'],value = cpusxd + shpsxd;

this does not produce a sum, or rather the following function does not
produce a sum

function total()
{
var cpus = document.forms['price'].elements['cpu'];
var cpusx = cpus.options[cpus.selectedIndex].value;
var cpusxd = cpusx.slice(6);
var shps = document.forms['price'].elements['shp'];
var shpsx = shps.options[shps.selectedIndex].value;
var shpsxd = shpsx.slice(7);
document.forms['price'].elements['amount'].value = cpusxd + shpsxd;
}

please note:

<select name="cpu" id="cpu" onchange="total();">
<option selected value="AMDx - 2500">

<select name="shp" id="shp" onchange="total();">
<option selected value="3Day - 100">

....
onchange="total();"returns 2500100

[Jim Land]

"EJ" <jo********@hotmail.comwrote in news:1174794390.053055.114290
@y66g2000hsf.googlegroups.com:

document.forms['price'].elements['amount'].value = cpusxd + shpsxd;

Sorry. This should work:

document.forms['price'].elements['amount'].value = +cpusxd + shpsxd;

The + in front of cpusxd converts from string to number.

[Dr J R Stockton]

In comp.lang.javascript message <Xns98FDF13CA7CB7rrrrffffttttnospamho@21
6.168.3.44>, Sun, 25 Mar 2007 04:42:52, Jim Land
<rr**********@hotmail.composted:

>"EJ" <jo********@hotmail.comwrote in news:1174794390.053055.114290
@y66g2000hsf.googlegroups.com:

> document.forms['price'].elements['amount'].value = cpusxd + shpsxd;

Sorry. This should work:

document.forms['price'].elements['amount'].value = +cpusxd + shpsxd;

The + in front of cpusxd converts from string to number.

You need to test not only your code but also your "corrections".

That should be ... = +cpusxd + +shpsxd; since + between Number and
String converts the Number to String and concatenates.

It's a good idea to read the newsgroup c.l.j and its FAQ. See below.

--
(c) John Stockton, Surrey, UK. ?@merlyn.demon.co.uk Turnpike v6.05 IE 6
news:comp.lang.javascript FAQ <URL:http://www.jibbering.com/faq/index.html>.
<URL:http://www.merlyn.demon.co.uk/js-index.htmjscr maths, dates, sources.
<URL:http://www.merlyn.demon.co.uk/TP/BP/Delphi/jscr/&c, FAQ items, links.

[Jim Land]

Dr J R Stockton <jr*@merlyn.demon.co.ukwrote in news:Uh74ap4FA
$B*****@invalid.uk.co.demon.merlyn.invalid:

That should be ... = +cpusxd + +shpsxd; since + between Number and
String converts the Number to String and concatenates.

I stand corrected.

[EJ]

thanks, you have all been a great help