Datagrid column calculate totals

Question

Hi - hope someone can help with this datagrid issue - I think
it's just a small bit of code I've got to tweak. Might be some
useful information to someone here anyway.
I've got a datagrid populated by info from mysql via amfphp.
I've managed to create a column that multiplies the qty and
price fields:
root.dgCart.addColumn(column2);
var column2 = new DataGridColumn();
column2.headerText = "sum";
column2.labelFunction = customLabelFunction2;
column2.columnName = 'sum';
function customLabelFunction2(item:Object):Number {
// if (item == undefined) return undefined;
var sumtotal = round2D(Number(item.item_price) *
Number(item.qty));
return sumtotal;
//helps to make decimals
function round2D (nr){
var tmp = String(nr)
var pos = tmp.substr(tmp.indexOf(".")+1)
if(tmp.indexOf(".")==-1) return nr+".00" //no decimals
else if(pos.length==1) return nr+"0" //1 decimal
else return Math.round (Number(nr) * 100) / 100 //2 or more
Now I'd like to get a total of all the items in the 'sum'
column - the following code works to add up the 'price' column but
the same approach doesn't seem to work for the 'sum' column -
perhaps because the figures are generated by a function?
function getTotal(){
var totalPrice = 0;
for(var i=0; i<root.dgCart.length; i++) totalPrice +=
Number(root.dgCart.getItemAt(i).item_price)
root.txttotal.htmlText = "<b>Total:</b> "+
round2D(totalPrice);
If anyone here could shed the light, I'd be sooooo
greatful!

Answer 1

I guess one way to do it would be to calculate the total from
your webservice (I am guessing you're using php to generate an xml
file) and then pass that to your flex project using the http
service.
or you could simply write a script for it within your
project.