beavenour wrote:
[color=blue]
> I am looking for some help creating a more universal function out of
> this lame attempt at javascript. I have little experience with
> javascript and want to be able to universalize this function. So how
> do I change this script so that I can call any field or any number of
> fields to be totaled? For example - calculate(myfield01, myfield02)
> at one total field and calculate(myfield06, myfield08, myfield11) at
> another total field instead of creating a whole new function to do
> each. Any help or suggestions would be very much apprectated.
>
> <SCRIPT language = JavaScript>
> function calculate() {
>
> a = parseInt(document.myform.myfield01.value);
> b = parseInt(document.myform.myfield02.value);
> c = parseInt(document.myform.myfield03.value);
> d = parseInt(document.myform.myfield04.value);
>
> z = Math.round((a + b + c + d)*100)/100;
> document.myform.total.value = z;
> }
> </SCRIPT>[/color]
I'm not sure what you actually want to pass to the function, but you have
some alternatives. I suppose I'd probably pass references to the form
elements to be totalled to the function, along with a reference to
element which will eventually contain the total:
<script type="text/javascript">
function calculate() {
var total = 0;
for (var i = 1; i < arguments.length; i++) {
total += parseInt(arguments[i].value, 10);
}
arguments[0].value = total;
}
</script>
<form name="myForm">
<input type="text" name="field01" value="1">
<input type="text" name="field02" value="2">
<input type="text" name="field03" value="3">
<input type="text" name="field04" value="4">
<input type="text" name="total" value="0">
<input type="button" value="Calculate"
onclick="calculate(this.form.total, this.form.field01, this.form.field03,
this.form.field04);">
</form>
You could also pass a reference to the form and the names of the fields:
function calculate() {
var total = 0;
var theForm = arguments[0];
var theResult = arguments[1];
for (var i = 2; i < arguments.length; i++) {
total += parseInt(theForm.elements[arguments[i]].value, 10);
}
theForm.elements[theResult].value = total;
}
and it could be called with:
<input type="button" value="Calculate" onclick="calculate(this.form,
'total', 'field01', 'field03', 'field04');">
Which specific implementation you choose depends on your requirements.
--
| Grant Wagner <gwagner@agricoreunited.com>
* Client-side Javascript and Netscape 4 DOM Reference available at:
*
http://devedge.netscape.com/library/...ce/frames.html
* Internet Explorer DOM Reference available at:
*
http://msdn.microsoft.com/workshop/a...ence_entry.asp
* Netscape 6/7 DOM Reference available at:
*
http://www.mozilla.org/docs/dom/domref/
* Tips for upgrading JavaScript for Netscape 7 / Mozilla
*
http://www.mozilla.org/docs/web-deve...upgrade_2.html 
total function 
