Need help with loop to add numbers

lawrencec

Hi there,

I'm trying to add the values of a number of form fields and to get a
result at the end. It must loop and be able to dynamically update the
result of calculation. I have attached the code i have so far.

Thanks

<html>
<head>
<title>Test</title>
<meta http-equiv="Content-Type" content="text/html;
charset=iso-8859-1">

<script language="JavaS cript1.2" type="text/JavaScript">

function calculate(curri d)
{
var rownumber = "";
var Qnt;
var Qnt_Total;

rownumber = currid.substrin g(currid.indexO f("_", currid) + 1);

//DEBUGGING
//alert(rownumber );
//return false;

Qnt = document.getEle mentById("Quant ity_" + rownumber).valu e;

for(var j = 0 ; j <= document.Captur eForm.elements. length ; j++)
{
cnt = j + 1;
//if(eval(documen t.CaptureForm.e lements[j].id) == "[object]")
if(document.Cap tureForm.elemen ts[j].id ==
"Quantity_"+Str ing(cnt))
{
if(document.Cap tureForm.elemen ts[j].value != "")
Qnt_Total += Number(document .CaptureForm.el ements[j].value);
}
}

document.Captur eForm.Totals1.v alue = Qnt_Total;
}

</script>

</head>

<body>
<form action="" method="post" name="CaptureFo rm">

<SPAN id="Quantity_La bel" style="LEFT: 518px; WIDTH: 62px; COLOR:
#000000;POSITIO N: absolute; TOP: 186px; HEIGHT: 13px; BACKGROUND-COLOR:
transparent; FONT-FAMILY:MS Sans Serif; FONT-SIZE:8pt;">Quan tity</SPAN>
<INPUT type="text" style="LEFT: 506; text-align: right; WIDTH: 86px;
COLOR: #000000;POSITIO N: absolute; TOP: 200; HEIGHT: 19px;
BACKGROUND-COLOR: transparent; FONT-FAMILY:MS Sans Serif;
FONT-SIZE:8pt;" name="Quantity" id="Quantity_1 " value="<?php echo
$row_Recordset1['Quantity']; ?>" onBlur="javascr ipt:
calculate(this. id);">
<INPUT type="text" style="LEFT: 506; text-align: right; WIDTH: 86px;
COLOR: #000000;POSITIO N: absolute; TOP: 226; HEIGHT: 19px;
BACKGROUND-COLOR: transparent; FONT-FAMILY:MS Sans Serif;
FONT-SIZE:8pt;" name="Quantity2 " id="Quantity_2 " value="<?php echo
$row_Recordset1['Quantity2']; ?>" onblur="javascr ipt:
calculate(this. id);">
<INPUT type="text" style="LEFT: 506; text-align: right; WIDTH: 86px;
COLOR: #000000;POSITIO N: absolute; TOP: 252; HEIGHT: 19px;
BACKGROUND-COLOR: transparent; FONT-FAMILY:MS Sans Serif;
FONT-SIZE:8pt;" name="Quantity3 " id="Quantity_3 " value="<?php echo
$row_Recordset1['Quantity3']; ?>" onblur="javascr ipt:
calculate(this. id);">
<INPUT type="text" style="LEFT: 506; text-align: right; WIDTH: 86px;
COLOR: #000000;POSITIO N: absolute; TOP: 279; HEIGHT: 19px;
BACKGROUND-COLOR: transparent; FONT-FAMILY:MS Sans Serif;
FONT-SIZE:8pt;" name="Quantity4 " id="Quantity_4 " value="<?php echo
$row_Recordset1['Quantity4']; ?>" onblur="javascr ipt:
calculate(this. id);">
<INPUT type="text" style="LEFT: 506; text-align: right; WIDTH: 86px;
COLOR: #000000;POSITIO N: absolute; TOP: 305; HEIGHT: 19px;
BACKGROUND-COLOR: transparent; FONT-FAMILY:MS Sans Serif;
FONT-SIZE:8pt;" name="Quantity5 " id="Quantity_5 " value="<?php echo
$row_Recordset1['Quantity5']; ?>" onblur="javascr ipt:
calculate(this. id);">
<INPUT type="text" style="LEFT: 506; text-align: right; WIDTH: 86px;
COLOR: #000000;POSITIO N: absolute; TOP: 331; HEIGHT: 19px;
BACKGROUND-COLOR: transparent; FONT-FAMILY:MS Sans Serif;
FONT-SIZE:8pt;" name="Quantity6 " id="Quantity_6 " value="<?php echo
$row_Recordset1['Quantity6']; ?>" onblur="javascr ipt:
calculate(this. id);">
<INPUT type="text" style="LEFT: 506; text-align: right; WIDTH: 86px;
COLOR: #000000;POSITIO N: absolute; TOP: 358; HEIGHT: 19px;
BACKGROUND-COLOR: transparent; FONT-FAMILY:MS Sans Serif;
FONT-SIZE:8pt;" name="Quantity7 " id="Quantity_7 " value="<?php echo
$row_Recordset1['Quantity7']; ?>" onblur="javascr ipt:
calculate(this. id);">
<INPUT type="text" style="LEFT: 506; text-align: right; WIDTH: 86px;
COLOR: #000000;POSITIO N: absolute; TOP: 384; HEIGHT: 19px;
BACKGROUND-COLOR: transparent; FONT-FAMILY:MS Sans Serif;
FONT-SIZE:8pt;" name="Quantity8 " id="Quantity_8 " value="<?php echo
$row_Recordset1['Quantity8']; ?>" onblur="javascr ipt:
calculate(this. id);">
<INPUT type="text" style="LEFT: 506; text-align: right; WIDTH: 86px;
COLOR: #000000;POSITIO N: absolute; TOP: 410; HEIGHT: 19px;
BACKGROUND-COLOR: transparent; FONT-FAMILY:MS Sans Serif;
FONT-SIZE:8pt;" name="Quantity9 " id="Quantity_9 " value="<?php echo
$row_Recordset1['Quantity9']; ?>" onblur="javascr ipt:
calculate(this. id);">
<INPUT type="text" style="LEFT: 506; text-align: right; WIDTH: 86px;
COLOR: #000000;POSITIO N: absolute; TOP: 436; HEIGHT: 19px;
BACKGROUND-COLOR: transparent; FONT-FAMILY:MS Sans Serif;
FONT-SIZE:8pt;" name="Quantity1 0" id="Quantity_10 " value="<?php echo
$row_Recordset1['Quantity10']; ?>" onblur="javascr ipt:
calculate(this. id);">
<INPUT type="text" style="LEFT: 506; text-align: right; WIDTH: 86px;
COLOR: #000000;POSITIO N: absolute; TOP: 463; HEIGHT: 19px;
BACKGROUND-COLOR: transparent; FONT-FAMILY:MS Sans Serif;
FONT-SIZE:8pt;" name="Quantity1 1" id="Quantity_11 " value="<?php echo
$row_Recordset1['Quantity11']; ?>" onblur="javascr ipt:
calculate(this. id);">
<INPUT type="text" style="LEFT: 506; text-align: right; WIDTH: 86px;
COLOR: #000000;POSITIO N: absolute; TOP: 489; HEIGHT: 19px;
BACKGROUND-COLOR: transparent; FONT-FAMILY:MS Sans Serif;
FONT-SIZE:8pt;" name="Quantity1 2" id="Quantity_12 " value="<?php echo
$row_Recordset1['Quantity11']; ?>" onblur="javascr ipt:
calculate(this. id);">
<INPUT type="text" style="LEFT: 493; text-align: right; WIDTH:
100px; COLOR: #000000;POSITIO N: absolute; TOP: 518; HEIGHT: 19px;
BACKGROUND-COLOR: transparent; FONT-FAMILY:MS Sans Serif;
FONT-SIZE:8pt;" name="Totals1" id="Totals1" value="<?php echo
$row_Recordset1['Totals1']; ?>">
</form>

</body>
</html>

Jul 10 '06 #1

Subscribe Reply

2401

Vincent van Beveren

Hi Lawrence,

Do you have a question? Besides, you can't use javascript: in an
eventhandler attribute (in your case onblur), because it already expects
that. javascript: is only used as an URL.

Vincent

la*******@litho tech.co.za wrote:

Hi there,

I'm trying to add the values of a number of form fields and to get a
result at the end. It must loop and be able to dynamically update the
result of calculation. I have attached the code i have so far.

Thanks

<html>
<head>
<title>Test</title>
<meta http-equiv="Content-Type" content="text/html;
charset=iso-8859-1">

<script language="JavaS cript1.2" type="text/JavaScript">

function calculate(curri d)
{
var rownumber = "";
var Qnt;
var Qnt_Total;

rownumber = currid.substrin g(currid.indexO f("_", currid) + 1);

//DEBUGGING
//alert(rownumber );
//return false;

Qnt = document.getEle mentById("Quant ity_" + rownumber).valu e;

for(var j = 0 ; j <= document.Captur eForm.elements. length ; j++)
{
cnt = j + 1;
//if(eval(documen t.CaptureForm.e lements[j].id) == "[object]")
if(document.Cap tureForm.elemen ts[j].id ==
"Quantity_"+Str ing(cnt))
{
if(document.Cap tureForm.elemen ts[j].value != "")
Qnt_Total += Number(document .CaptureForm.el ements[j].value);
}
}

document.Captur eForm.Totals1.v alue = Qnt_Total;
}

</script>

</head>

<body>
<form action="" method="post" name="CaptureFo rm">

<SPAN id="Quantity_La bel" style="LEFT: 518px; WIDTH: 62px; COLOR:
#000000;POSITIO N: absolute; TOP: 186px; HEIGHT: 13px; BACKGROUND-COLOR:
transparent; FONT-FAMILY:MS Sans Serif; FONT-SIZE:8pt;">Quan tity</SPAN>
<INPUT type="text" style="LEFT: 506; text-align: right; WIDTH: 86px;
COLOR: #000000;POSITIO N: absolute; TOP: 200; HEIGHT: 19px;
BACKGROUND-COLOR: transparent; FONT-FAMILY:MS Sans Serif;
FONT-SIZE:8pt;" name="Quantity" id="Quantity_1 " value="<?php echo
$row_Recordset1['Quantity']; ?>" onBlur="javascr ipt:
calculate(this. id);">
<INPUT type="text" style="LEFT: 506; text-align: right; WIDTH: 86px;
COLOR: #000000;POSITIO N: absolute; TOP: 226; HEIGHT: 19px;
BACKGROUND-COLOR: transparent; FONT-FAMILY:MS Sans Serif;
FONT-SIZE:8pt;" name="Quantity2 " id="Quantity_2 " value="<?php echo
$row_Recordset1['Quantity2']; ?>" onblur="javascr ipt:
calculate(this. id);">
<INPUT type="text" style="LEFT: 506; text-align: right; WIDTH: 86px;
COLOR: #000000;POSITIO N: absolute; TOP: 252; HEIGHT: 19px;
BACKGROUND-COLOR: transparent; FONT-FAMILY:MS Sans Serif;
FONT-SIZE:8pt;" name="Quantity3 " id="Quantity_3 " value="<?php echo
$row_Recordset1['Quantity3']; ?>" onblur="javascr ipt:
calculate(this. id);">
<INPUT type="text" style="LEFT: 506; text-align: right; WIDTH: 86px;
COLOR: #000000;POSITIO N: absolute; TOP: 279; HEIGHT: 19px;
BACKGROUND-COLOR: transparent; FONT-FAMILY:MS Sans Serif;
FONT-SIZE:8pt;" name="Quantity4 " id="Quantity_4 " value="<?php echo
$row_Recordset1['Quantity4']; ?>" onblur="javascr ipt:
calculate(this. id);">
<INPUT type="text" style="LEFT: 506; text-align: right; WIDTH: 86px;
COLOR: #000000;POSITIO N: absolute; TOP: 305; HEIGHT: 19px;
BACKGROUND-COLOR: transparent; FONT-FAMILY:MS Sans Serif;
FONT-SIZE:8pt;" name="Quantity5 " id="Quantity_5 " value="<?php echo
$row_Recordset1['Quantity5']; ?>" onblur="javascr ipt:
calculate(this. id);">
<INPUT type="text" style="LEFT: 506; text-align: right; WIDTH: 86px;
COLOR: #000000;POSITIO N: absolute; TOP: 331; HEIGHT: 19px;
BACKGROUND-COLOR: transparent; FONT-FAMILY:MS Sans Serif;
FONT-SIZE:8pt;" name="Quantity6 " id="Quantity_6 " value="<?php echo
$row_Recordset1['Quantity6']; ?>" onblur="javascr ipt:
calculate(this. id);">
<INPUT type="text" style="LEFT: 506; text-align: right; WIDTH: 86px;
COLOR: #000000;POSITIO N: absolute; TOP: 358; HEIGHT: 19px;
BACKGROUND-COLOR: transparent; FONT-FAMILY:MS Sans Serif;
FONT-SIZE:8pt;" name="Quantity7 " id="Quantity_7 " value="<?php echo
$row_Recordset1['Quantity7']; ?>" onblur="javascr ipt:
calculate(this. id);">
<INPUT type="text" style="LEFT: 506; text-align: right; WIDTH: 86px;
COLOR: #000000;POSITIO N: absolute; TOP: 384; HEIGHT: 19px;
BACKGROUND-COLOR: transparent; FONT-FAMILY:MS Sans Serif;
FONT-SIZE:8pt;" name="Quantity8 " id="Quantity_8 " value="<?php echo
$row_Recordset1['Quantity8']; ?>" onblur="javascr ipt:
calculate(this. id);">
<INPUT type="text" style="LEFT: 506; text-align: right; WIDTH: 86px;
COLOR: #000000;POSITIO N: absolute; TOP: 410; HEIGHT: 19px;
BACKGROUND-COLOR: transparent; FONT-FAMILY:MS Sans Serif;
FONT-SIZE:8pt;" name="Quantity9 " id="Quantity_9 " value="<?php echo
$row_Recordset1['Quantity9']; ?>" onblur="javascr ipt:
calculate(this. id);">
<INPUT type="text" style="LEFT: 506; text-align: right; WIDTH: 86px;
COLOR: #000000;POSITIO N: absolute; TOP: 436; HEIGHT: 19px;
BACKGROUND-COLOR: transparent; FONT-FAMILY:MS Sans Serif;
FONT-SIZE:8pt;" name="Quantity1 0" id="Quantity_10 " value="<?php echo
$row_Recordset1['Quantity10']; ?>" onblur="javascr ipt:
calculate(this. id);">
<INPUT type="text" style="LEFT: 506; text-align: right; WIDTH: 86px;
COLOR: #000000;POSITIO N: absolute; TOP: 463; HEIGHT: 19px;
BACKGROUND-COLOR: transparent; FONT-FAMILY:MS Sans Serif;
FONT-SIZE:8pt;" name="Quantity1 1" id="Quantity_11 " value="<?php echo
$row_Recordset1['Quantity11']; ?>" onblur="javascr ipt:
calculate(this. id);">
<INPUT type="text" style="LEFT: 506; text-align: right; WIDTH: 86px;
COLOR: #000000;POSITIO N: absolute; TOP: 489; HEIGHT: 19px;
BACKGROUND-COLOR: transparent; FONT-FAMILY:MS Sans Serif;
FONT-SIZE:8pt;" name="Quantity1 2" id="Quantity_12 " value="<?php echo
$row_Recordset1['Quantity11']; ?>" onblur="javascr ipt:
calculate(this. id);">
<INPUT type="text" style="LEFT: 493; text-align: right; WIDTH:
100px; COLOR: #000000;POSITIO N: absolute; TOP: 518; HEIGHT: 19px;
BACKGROUND-COLOR: transparent; FONT-FAMILY:MS Sans Serif;
FONT-SIZE:8pt;" name="Totals1" id="Totals1" value="<?php echo
$row_Recordset1['Totals1']; ?>">
</form>

</body>
</html>

Jul 10 '06 #2

Lasse Reichstein Nielsen

la*******@litho tech.co.za writes:

I'm trying to add the values of a number of form fields and to get a
result at the end. It must loop and be able to dynamically update the
result of calculation. I have attached the code i have so far.

<script language="JavaS cript1.2" type="text/JavaScript">

Don't use the language attribute. If you do use the langauge
attribute, make sure *not* to specify version 1.2. That particular
version of Javascript was only the most current one in Nescape
Navigator 4.0 through 4.06. It had slightly different behavior
from earlier and later versions, and was probably replaced for
that reason. Specifying version 1.2 will make Netscape and Mozilla
browsers use that slightly different behavior, whereas other
browsers will use the behavior of the more recent versions
of Javascript.

function calculate(curri d)
{
var rownumber = "";

The indentation makes it hard to read and comment on the code, so I've
prettyprinted it:

function calculate(curri d) {

I assume currid is the id of an input element.

var rownumber = "";
var Qnt;
var Qnt_Total;
rownumber = currid.substrin g(currid.indexO f("_", currid) + 1);
Qnt = (document.getEl ementById("Quan tity_" + rownumber)).val ue;

Isn't "Quantity_"+row number always the same as currid?

You are not using "Qnt" anywhere, so both rownumber and Qnt can be
omitted.

for (var j = 0;j <= document.Captur eForm.elements. length;j++) {

"<=" should be "<"

cnt = j + 1;
if (document.Captu reForm.elements[j].id == "Quantity_" + String(cnt))

You are expecting the Quantity_x's to come in a fixed order. They
probably do, but it's not necessary for computing the sum.

{
if (document.Captu reForm.elements[j].value != "")
Qnt_Total += Number(document .CaptureForm.el ements[j].value);

Qnt_Total was never initialized, so it initially contained undefined.
Adding numbers to that gives NaN.

}
}
document.Captur eForm.Totals1.v alue = Qnt_Total;
}

Try this instead:

<script type="text/javascript">
function calculate(input Id) {
var totalQuantity = 0;
var elems = document.forms['CaptureForm'].elements;
for(var i = 0; i < elems.length; i++) {
var elem = elems[i];
if (elem.id.matche s(/^Quantity_\d+$/)) {
totalQuantity += Number(elem.val ue):
}
}
elems['Totals1'].value = tatalQuantity;
}
</script>

<form action="" method="post" name="CaptureFo rm">

Is the form intended for submission? In that case, you should state
the URL, and not just rely on the browser posting to the same URL as
itself (it should do that, but some browsers didn't).
Some comments on the HTML:

<SPAN id="Quantity_La bel" style="LEFT: 518px; WIDTH: 62px; COLOR:
#000000;POSITIO N: absolute; TOP: 186px; HEIGHT: 13px; BACKGROUND-COLOR:
transparent; FONT-FAMILY:MS Sans Serif; FONT-SIZE:8pt;">Quan tity</SPAN>

You should look into using a stylesheet, so you don't specify this
huge style attribute on every span (easier to read and easier to
maintain, since the common styles are specified in just one
place).

You might also want to use the <labelelement for labels:
<label id="Quantity_La bel" for="Quantity_1 ">Quantity</label>

It looks like auto-generated code by a less-than-brilliant HTML
authoring program :)

<INPUT type="text" style="LEFT: 506; text-align: right; WIDTH: 86px;
COLOR: #000000;POSITIO N: absolute; TOP: 200; HEIGHT: 19px;
BACKGROUND-COLOR: transparent; FONT-FAMILY:MS Sans Serif;
FONT-SIZE:8pt;" name="Quantity" id="Quantity_1 " value="<?php echo

Your "name" attribute is inconsistent. To match the other lines,
it would be "Quantity1" .

$row_Recordset1['Quantity']; ?>" onBlur="javascr ipt:
calculate(this. id);">

You are including php-code here. That does not help us help you, since
we annot know exactly what HTML code the browser sees. I'll assume
that the PHP code just inserts a number.

The onblur attribute starts with "javascript :". That's unnecessary, and
only coincidentally not an error. The Javascript parser sees it as
a label that just happens to be called "javascript ", but could equally
well be called "arglebargl e". (However, IE parses it as specifying
that the attribute should be parsed as Javascript, which is only
necessary if the page's general scripting language is something else,
like vbscript).

/L
--
Lasse Reichstein Nielsen - lr*@hotpop.com
DHTML Death Colors: <URL:http://www.infimum.dk/HTML/rasterTriangleD OM.html>
'Faith without judgement merely degrades the spirit divine.'

Jul 10 '06 #3

Richard Cornford

Vincent van Beveren wrote:
<snip>

>... Besides, you can't use javascript: in an eventhandler attribute (in
your case onblur), because it already expects that.

The values for intrinsic event handling attributes can start with -
javascript: -. In that context it would be a label by javascript syntax
rules. Putting a label in that context is almost always worthless, and
as a label - javascript - is a dangerous choice as IE browsers attach
additional meaning to the construct in a way that will not result in a
label, but it still syntactically valid, mostly harmless and allowed.

javascript: is only used as an URL.

<snip>

The javascript pseudo protocol (which is a different thing from a label
in an intrinsic event attribute value) should almost never be used at
all. ('almost' meaning that there are maybe two contexts at most where
its use might be appropriate, neither or which are common).

la*******@litho tech.co.za wrote:

<snip>

Please do not top-post to comp.lang.javas cirpt, and do trim the
material that you do quote to only that which is necessary to maintain
the context of your response.

Richard.

Jul 10 '06 #4

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