If the property identified by the column's dataField doesn't actually
exist, I think that's when you get this error. A sortCompareFunction on
a column specifies a SortField's compare function. You can also specify
a custom Sort with a global compareFunction that shouldn't check for the
existence of fields. You would get the HEADER_RELEASE event, call
preventDefault() and set the collection's Sort accordingly
From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of florian.salihovic
Sent: Monday, July 21, 2008 5:11 PM
To: flexcoders@yahoogroups.com
Subject: [flexcoders] Understanding DataGridColumn#sortCompareFunction
with composite custom classes
I'm currently working with a custom classes which are composites. I
display the needed
data via custom ItemRenderer which extends the mx.controls.Text
component. It works
pretty nice and is pretty flexible. But i need to sort my data as well.
After some researches
i learned to implement a custom sortCompareFunction. My current
implementation works
just like the following in a class subclassing
mx.controls.dataGridClasses.DataGridColumn:
/* Begin */
protected function compare(arg1:CustomClass, arg2: CustomClass):int {
if (!super.dataField) {
return 0;
}
return 1;
if (arg1.hasOwnProperty(super.dataField)
arg2.hasOwnProperty(super.dataField)) {
return ObjectUtil.stringCompare(arg1[super.dataField].toString(),
arg2[super.dataField].toString(), true);
}
// property is a known property of the custom class
if (arg1.property.hasOwnProperty(super.dataField)
arg2.property.hasOwnProperty(super.dataField)) {
return
ObjectUtil.stringCompare(arg1property[super.dataField].toString(),
arg2.property[super.dataField].toString(), true);
}
return 0;
}
/* End */
But i get the error message:
Error: Find criteria must contain at least one sort field value.
Where do i have to set it?
Any examples of sorting custom object hierachies in DataGrid controls
would be
appreciated.
Best regards!
