Re: [flexcoders] Re: DataGrid Totals Row

Thu, 27 Jul 2006 16:09:53 -0700

Paul,
That is definetly step in the right direction - the code has to  be on REFRESH method override rather then constructor. Under no circumstance you should touch the original data - localIndex only.
 After that there are 3 main issues you need to face:
1. Styling has to be different for the last row - need dynamic runtime styles and props
2. Sorting on any column but value is going to blow
3. Finding the change event and recalculating - without explicit dependencies it works fine for 100 rows*columns, but not for thousands
 
That would be good for demo/local mangement, but I would use extreme caution not to promise business component based on that techique alone.
 
As you start to add grouping, sorting, pagination(last row like first row has to be always visible) - you end up with quite a chunk of code.
Most important, we are still debating if "banded" grid would have better performance as most of the customization we saw is "row-oriented" and it does simplify the implementation code
 
Regards,
Anatole

 
On 7/27/06, Paul BH <[EMAIL PROTECTED]> wrote:

if i can suggest a slightly different approach, how about using a kind of adapter to acheive what you are after:
in quick & dirty code:
<mx:DataGrid dataProvider="{adaptDP(theData)}">
  <mx:DataGridColumn dataField="name"/>
  <mx:DataGridColumn dataField="value"/>
</mx:DataGrid>

private function adaptDP(inArr:Array):Array{
  var outArr:Array =[];
var total:Number = 0
 for (var i:Number=0;i<inArr.length ;++i){
 total += inArr.value;
outArr.push(inArr[i]);
}
outArr.push({name:"Total", value:total})
return outArr;
}

this of course wont help with the sorting thing, but Im sure you could work a way around that too if you needed it...




On 7/27/06, flxcoder < [EMAIL PROTECTED]> wrote:

Thanks for the advice. I think I might look into setting up a data
provider for a day and see how far I can take it. I have seen another
example today of coloring row backgrounds so that will be useful.

The product demo you have out there is pretty impressive. Is it for
sale/development? I guess you are planning on mktg to developers.
good work!

--- In [email protected], "Anatole


Tartakovsky" <[EMAIL PROTECTED]> wrote:
>
> Depends on the number of objects/customization needed .
>
> Stacking things manually is going to be quick and efficient - you
will have
> working grid in a day
> You can have 100 working grids in 4 month
>
> Manipulation of data provider is less obvious. WIll take you at
least few
> weeks to work out "static" solution
> Making it fully dynamic with grouping/sorting/filtering is a bit
tedious.
> Here is what you can do with dataProvider approach:
> http://derby.faratasystems.com/fxReporter/presentation/
presentation.html
>
> Sorry, the live demo is available for Beta 3 player only -
commercial
> version will be released "second half of 2006"
>
> Thank you,
> Anatole
>
>
>
>
> On 7/27/06, flxcoder <[EMAIL PROTECTED]> wrote:
> >
> > any advice on this. i am plan to start work on this today. i
have
> > seen examples of creating editable datagrids that have subtotals
at
> > the end of the column - so i know its possible by working only
with
> > the data provider and letting the datagrid handle just the
display.
> >
> > so is it advisable to stick with one grid only and keep showing
> > subtotals on the lines or create multiple grids and stack them
> > together.
> >
> > Thanks.
> >
> > --- In [email protected] <flexcoders%40yahoogroups.com>,

> > "flxcoder" <flxcoder@> wrote:
> > >
> > > This topic is similiar to what I am looking for. A datagrid that
> > has
> > > say 10 rows with the 3rd and say the 7th row showing subtotals
and
> > > the 11th row showing the grand total.
> > >
> > > From what I read in this conversation thus far, it seems that
the
> > > solution is to create multiple datagrids and calculate the
totals
> > > from the dataproviders.
> > >
> > > So in the case that i described above, am i right in assuming
that
> > i
> > > will need 5 datagrids with 4 of them having their headers cut
off,
> > > all lined up and pretty.
> > >
> > > am i heading in the right direction or is there a better way.
> > >
> > > Thanks.
> > >
> > > --- In [email protected]
<flexcoders%40yahoogroups.com>, "Lisa

> > Nelson" <ltwede@> wrote:
> > > >
> > > > By the way on the background color. That was dumb. I was only
> > > > displaying the column headings of my totals datagrid.
> > > >
> > > > -----Original Message-----
> > > > From: [email protected]
<flexcoders%40yahoogroups.com>
> > > [mailto: [email protected]
<flexcoders%40yahoogroups.com>] On
> > > > Behalf Of Lisa Nelson
> > > > Sent: Friday, July 07, 2006 8:21
> > > > To: [email protected] <flexcoders%40yahoogroups.com>
> > > > Subject: RE: [flexcoders] Re: DataGrid Totals Row
> > > >
> > > > I tried that after I saw your message. That didn't help.
> > > >
> > > > Here's what else is funky. I can't seem to change the
background
> > > color
> > > > of the totals datagrid. All I can figure is somehow the fact
> > that
> > > it
> > > > only has 1 row affects it. You can see the problem in design
> > view,
> > > and
> > > > also at run-time.
> > > >
> > > > --Lisa
> > > >
> > > > -----Original Message-----
> > > > From: [email protected]
<flexcoders%40yahoogroups.com>
> > > [mailto: [email protected]
<flexcoders%40yahoogroups.com>] On
> > > > Behalf Of Tom Chiverton
> > > > Sent: Friday, July 07, 2006 8:02
> > > > To: [email protected] <flexcoders%40yahoogroups.com>
> > > > Subject: Re: [flexcoders] Re: DataGrid Totals Row
> > > >
> > > > On Friday 07 July 2006 15:37, Lisa Nelson wrote:
> > > > > I am pretty new to Flex. But I thought what you wrote would
> > bind
> > > to
> > > > > the width of the overall grid, not the individual column
widths.
> > > >
> > > > It would, yeah :-)
> > > > I'm guessing you have to bind both the overall width and all
the
> > > columns
> > > > to make it work.
> > > >
> > > > --
> > > > Tom Chiverton
> > > >
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