DataGrid itemRenderer done in code?

Question

I've searched for info on how to implement itemRenderer for a
DataGrid, and despite seeing some docs and examples, they're all
very different from what I think I want, and what I think should
also be possible.
Here's what I want: for one column (called "alert"), I want
to be able to programmatically display an appropriate image (or
even just render a character, such as "X") based on the data value
of that cell.
I would think it should be something like this:
<mx:Script>
private function RenderAlert(... ? ) :String {
if (data == "delayed") return "D"
else if (data == "canceled") return "X"
</mx:Script>
<mx:DataGrid ...>
<mx:columns>
<mx:DataGridColumn headerText="Alert" dataField="alert"
itemRenderer="RenderAlert"/>
</mx:columns>
</mx:DataGrid>
So, if anyone can point me to an example like this, I'd be
very appreciative. I'm really hoping it's possible, as all the
other methods I've seen illustrated don't appear to handle the
render decisions in code.
Thanks!

Answer 1

By default, I'm not exactly sure what each cell is.I'm sure
if we dug into the docs somewhere it would tell us..
I've always done any conditional stuff in my itemrenderer
component.
Specifically in the set data function which you should
override:
i.e the following is a snippet that sets a combobox
itemrenderer in a datagrid. It gets the ID of the current object
being rendered then looks it
up in an arraycollection to get the "english/display name" of
that ID then sets that as the selected item in the combo box
override public function set data(value:Object):void {
yy = this.parentApplication.AC_semesters;
if ((value != null) && (yy != null) &&
yy.length > 0) {
a_course = Course(value);
this.invalidateProperties();
for (var i:int = 0; i < yy.length; i++)
var firstItem:Object = yy.getItemAt(i);
var myid:int = a_course.crs_semester;
if (firstItem.sem_id == myid)
cb3.selectedIndex = i;
so in your case you could make up an itemrenderer component
being a label, then in your set data function, have a conditional
check to set the label.text = "X" if the value passed in is equal
to whatever.
Hope this helps...