Updating a field on a different from as a total

[Tim Chmielewski]

The following page is a test for a form that is meant to accept extra
order information for certain products:
http://www.humanedge.biz/tim/testtotals.htm

The extra field at the bottom is meant to show the total quantity for an
order, but due to the way the form is processed I had to put it on a
seperate form that seems to interfere with the function I use to show the
totals.

The function is as follows:
function CalculateTotal(frm) {
var Total_Quantity = 0
for (var i=0; i < frm.elements.length; ++i) {

form_field = frm.elements[i]

form_name = form_field.name

if (form_name.substring(0,8) == "Quantity") {

item_quantity = parseInt(form_field.value)

if (item_quantity >= 0) {
Total_Quantity += item_quantity
}
}
}
document.TotalQuantity.value = Total_Quantity
}

No matter what format I use, it always seems to say that
'document.TotalQuantity.value' is null or not an object (I even tried
passing both forms involved to the function.)

Thanks.

--
GIT Groupie : http://gitgroupie.timchuma.com
The Twits Give Me the Shits : http://twitsgivemetheshits.timchuma.com
My Photos : http://photos.timchuma.com
Hong Kong Movie Reviews: http://hkmovies.timchuma.com

[Mick White]

Tim Chmielewski wrote:

The following page is a test for a form that is meant to accept extra
order information for certain products:
http://www.humanedge.biz/tim/testtotals.htm

The extra field at the bottom is meant to show the total quantity for an
order, but due to the way the form is processed I had to put it on a
seperate form that seems to interfere with the function I use to show the
totals.

The function is as follows:
function CalculateTotal(frm) {
var Total_Quantity = 0
for (var i=0; i < frm.elements.length; ++i) {

form_field = frm.elements[i]

form_name = form_field.name

if (form_name.substring(0,8) == "Quantity") {

item_quantity = parseInt(form_field.value)

if (item_quantity >= 0) {
Total_Quantity += item_quantity
}
}
}
document.TotalQuantity.value = Total_Quantity
}
document.forms["form name here"].Total_Quantity.value=Total_Quantity

But be wary of using variable names that are also names of form controls.
Mick

No matter what format I use, it always seems to say that
'document.TotalQuantity.value' is null or not an object (I even tried
passing both forms involved to the function.)

Thanks.

[Tim Chmielewski]

Mick White <mw******@BOGUSrochester.rr.com> wrote in
news:Hn*******************@twister.nyroc.rr.com:

Tim Chmielewski wrote:

function CalculateTotal(frm) {
var Total_Quantity = 0
for (var i=0; i < frm.elements.length; ++i) {

form_field = frm.elements[i]

form_name = form_field.name

if (form_name.substring(0,8) == "Quantity") {

item_quantity = parseInt(form_field.value)

if (item_quantity >= 0) {
Total_Quantity += item_quantity
}
}
}
document.TotalQuantity.value = Total_Quantity
}

document.forms["form name here"].Total_Quantity.value=Total_Quantity

But be wary of using variable names that are also names of form
controls. Mick

Now it wants ; on every line, even those that don't need one.

Thanks.

--
GIT Groupie : http://gitgroupie.timchuma.com
The Twits Give Me the Shits : http://twitsgivemetheshits.timchuma.com
My Photos : http://photos.timchuma.com
Hong Kong Movie Reviews: http://hkmovies.timchuma.com

[Tim Chmielewski]

Tim Chmielewski <ch***@dcsi.net.au> wrote in
news:Xn****************************@130.133.1.4:

document.forms["form name here"].Total_Quantity.value=Total_Quantity

But be wary of using variable names that are also names of form
controls. Mick

Now it wants ; on every line, even those that don't need one.

I found that error, but it is still doing the same thing as before.

Thanks.
--
GIT Groupie : http://gitgroupie.timchuma.com
The Twits Give Me the Shits : http://twitsgivemetheshits.timchuma.com
My Photos : http://photos.timchuma.com
Hong Kong Movie Reviews: http://hkmovies.timchuma.com

[Mick White]

Tim Chmielewski wrote:

Tim Chmielewski <ch***@dcsi.net.au> wrote in

document.forms["form name here"].Total_Quantity.value=Total_Quantity

But be wary of using variable names that are also names of form
controls. Mick

Now it wants ; on every line, even those that don't need one.

I found that error, but it is still doing the same thing as before.

Thanks.

URL?

Mick

[Tim Chmielewski]

Mick White <mw******@BOGUSrochester.rr.com> wrote in news:ianHc.23700
$b********@twister.nyroc.rr.com:

I found that error, but it is still doing the same thing as before.

Thanks.

URL?

http://www.humanedge.biz/tim/testtotals.htm

Thanks.
--
GIT Groupie : http://gitgroupie.timchuma.com
The Twits Give Me the Shits : http://twitsgivemetheshits.timchuma.com
My Photos : http://photos.timchuma.com
Hong Kong Movie Reviews: http://hkmovies.timchuma.com

[Mick White]

Tim Chmielewski wrote:

Mick White <mw******@BOGUSrochester.rr.com> wrote in news:ianHc.23700
$b********@twister.nyroc.rr.com:

I found that error, but it is still doing the same thing as before.

Thanks.

URL?

http://www.humanedge.biz/tim/testtotals.htm

Thanks.

You have improperly nested your <form> tags, and your hidden tag is in
no man's land between </td> and <tr>.
Mick

[Dr John Stockton]

JRS: In article <Xn****************************@130.133.1.4>, seen in
news:comp.lang.javascript, Tim Chmielewski <ch***@dcsi.net.au> posted at
Thu, 8 Jul 2004 22:54:53 :

item_quantity = parseInt(form_field.value)

if (item_quantity >= 0) {
Total_Quantity += item_quantity

Other things apart :

Function parseInt is unsafe without a second parameter, unless the input
is controlled; read the FAQ.

ISTM best to check all such inputs with a RegExp; see my js-valid.htm.

There is no need to avoid adding zero to a number; only if the total
number *and* proportion of zeroes is large does there seem to be any
chance of saving time thereby. If the quantity is negative it should
not be ignored.

Variables introduced in a function should use var, unless they need to
be global (in which case it is probably clearer to define them outside).

--
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