RE: [flexcoders] Creating calculated columns inside of DataGrid

[Mike Anderson]

Thanks Anatole (and others that chimed 
in),
 
You truly ARE an amazing programmer - I wish I had just a 
fraction of your talent.
 
I know you don't hear too much from me on this list, but 
I've been using Flex since Version 1, and have been following it very closely 
ever since.  I've been following your projects as well - and all I can say 
is "Amazing Work" - your talents and depth of 
understanding of this technology is spectacular.
 
Just thought I'd add this little tidbit - as it's important 
to acknowledge people for their time and efforts, helping 
others.
 
Thanks and take care :)
 
Mike


From: flexcoders@yahoogroups.com 
[mailto:[EMAIL PROTECTED] On Behalf Of Anatole 
TartakovskySent: Wednesday, September 27, 2006 10:40 PMTo: 
flexcoders@yahoogroups.comSubject: Re: [flexcoders] Creating 
calculated columns inside of DataGrid

OK, can't pass...  here it goes
 
In training sessions we usually recommend to stay away from 
labelFunction as it is being used for formatting and other functionality. 
Instead on your ActionScript row record you define getter for formula like 
this:
 
public function get extendedPrice(data:Object) {
   return data.price * data.quantity;
}
 
That allows you to be able to do ANYTHING with the extendedPrice you can do 
with regular columns - filter/sort/total/apply labelFunction, use in other 
expressions like calculations of discounts.
 
As far as reporting - here is a list of references you can explore on some 
of our open source free and commercial Flex 2 products
RealWorld Flex video - http://www2.sys-con.com/webinararchive.cfm?pid=wc_rwf6_s02fain&registered=on
The last 10 minutes is reportwriter and language extensions for computed 
expressions in dataGrid
 
For whatever screen capture video is out of sync, so here are slides 
and video http://www.faratasystems.com/?page_id=70 . 
You will need codec listed on the page in order to see video of the running 
system. 
Of course, you can see it live - either @ max'06 or by contacting the 
presenters.
 
 
Regards,
Anatole Tartakovsky
www.faratasystems.com
 
 
 
On 9/27/06, Mike 
Anderson <[EMAIL PROTECTED]> 
wrote: 

  
  
  
  
  
  Thanks 
  Dustin - I was looking at that too -
   
  I just got 
  hung up on Flex doing it in a different way, and was looking elsewhere for the 
  answer.
   
  Not sure 
  if you remember the FireFly Controls (from Cybersage Software) that Macromedia 
  steamrolled over a few years back, but they dipped into a large chunk of their 
  functionality when they released the V2 Controls for Flash.  In the 
  Column definitions, you could literally flag certain columns to be "Subtotal" 
  and "Running Total" type containers.  It really was a work of art, until 
  they got absorbed... 
   
  Again, 
  thanks for your help -
   
  Mike
  
  
  From: [EMAIL PROTECTED]ups.com [mailto: flexcoders@yahoogroups.com] On Behalf Of Dustin 
  MercerSent: Wednesday, September 27, 2006 6:39 PMTo: 
  [EMAIL PROTECTED] ups.comSubject: RE: 
  [flexcoders] Creating calculated columns inside of 
  DataGrid 
  
  
  
  The labelFunction on 
  the DataGridColumn should do what you are asking.  Here is an exerpt from 
  the docs @ http://livedocs.macromedia.com/flex/2/langref/mx/controls/dataGridClasses/DataGridColumn.html
   
  
    
    
      
        labelFunction
      
        property
      
         
  labelFunction: Function  [read-write] 
  A 
  function that determines the text to display in this column. By default the 
  column displays the text for the field in the data that matches the column 
  name. However, sometimes you want to display text based on more than one field 
  in the data, or display something that does not have the format that you want. 
  In such a case you specify a callback function using labelFunction. 
  For the 
  DataGrid control, the method signature has the following 
  form:
  labelFunction(item:Object, 
  column:DataGridColumn):String
  Where 
  item contains the DataGrid item object, 
  and column specifies the DataGrid 
column.
  A 
  callback function might concatenate the firstName and lastName fields in the 
  data, or do some custom formatting on a Date, or convert a number for the 
  month into the string for the month. 
  This 
  property can be used as the source for data binding.
  Implementation     public function get 
  labelFunction(): Function     public function 
  set labelFunction(value: Function):void 
   
   
   
  
  
  
  
  From: 
  [EMAIL PROTECTED] ups.com [mailto:flexcoders@ yahoogroups.com] On Behalf Of Mike AndersonSent: Wednesday, September 27, 2006 4:24 
  PM To: [EMAIL PROTECTED]ups.comSubject: 
  [flexcoders] Creating calculated columns inside of 
  DataGrid
   
  
  
  
  Hello 
  All,Are there any tutorials or examples, that demonstrate Grid Columns 
  whichpossess the ability to take the contents of other Grid Columns, and 
  perform calculations?The clearest example of this, would be an 
  order form - where there wouldbe a Product and it's related price, and 
  then a blank for Quantity -then finally, the Total blank - which shows the 
  result of the multiplied values.Could any of you point me in the 
  right direction, as how to do this?Thanks in 
  advance,Mike
  
  
   
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