Calc function not setting value

[mickeyg]

I have an order form with about 10 line items and am trying to write a reusable function for line price calculating. I pass in the price and fieldname prefix to my function, but it is not updating my 'total' field. It only updates the 'total' field when I hard code the left hand side of the assigment (see commented out line below).

I thought this had something to do with eval(), but have not been able to get that to fix it.

form fields:
<input type=&quot;text&quot; name=&quot;chunkqty&quot; size=&quot;10&quot; onblur=&quot;calcsubtotal('3.25','chunk')&quot;/>
<input type=&quot;text&quot; name=&quot;chunktotal&quot; size=&quot;7&quot; />

function calcsubtotal(unitprice,productname) {
var myform = 'document.mglures.';
var subtotal;
var qtywidget = myform + [productname] + 'qty.value';
var totalwidget = myform + [productname] + 'total.value';

subtotal = [unitprice] * eval(qtywidget);
// update subtotal value
//document.mglures.chunktotal.value = subtotal;
totalwidget = subtotal;
}

Thanks,
Mickey

 

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[jemminger]

Mickey,

your original code is pretty close aside from a few syntax errors...try this:

function calcsubtotal(unitprice, productname) {
var myform = document.mglures;
var subtotal;
var qtywidget = myform[productname + 'qty'];
var totalwidget = myform[productname + 'total'];

subtotal = unitprice * qtywidget.value;
totalwidget.value = subtotal;
}

=========================================================
while (!succeed) try();
-jeff