Complete example of conditional datagrid editing dependent upon associated value in row

Example.mxml

<?xml version="1.0"?>
<!-- itemRenderers\events\EndEditEventPreventEdit.mxml -->
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
               xmlns:s="library://ns.adobe.com/flex/spark" 
               xmlns:mx="library://ns.adobe.com/flex/mx"
               initialize="init()">
    
    <fx:Script>
        <![CDATA[
            import mx.collections.ArrayCollection;
            import mx.collections.ListCollectionView;
            import mx.events.DataGridEvent;
            import mx.events.ListEvent;

            [Bindable]
            private var initDG:ArrayCollection = new ArrayCollection([
                {ID: 0, Artist:'Joe Blow', Album:'Some Record', 
                    Price:5.99},
                {ID: 1, Artist:'Pavement', Album:'Brighten the Corners', 
                    Price:11.99},
                {ID: 2, Artist:'Pavement', Album:'Brighten the Corners', 
                    Price:11.99}
            ]);

            private function disableEditing(event:DataGridEvent):void 
            {
                // get the value in the row that has been triggered
                var item:Object = ListCollectionView(myGrid.dataProvider)
                    .getItemAt(event.rowIndex);

                // get the name of the column being edited
                var colName:String = myGrid.columns[event.columnIndex].dataField;
                
                if(colName == 'Price' && item.ID == 0)
                {  
                    event.preventDefault();
                }
            }

        ]]>
    </fx:Script>
    
    <mx:DataGrid id="myGrid" 
                 dataProvider="{initDG}" 
                 editable="true" 
                 itemEditBeginning="disableEditing(event)" >   
        <mx:columns>
            <mx:DataGridColumn dataField="ID" editable="false"/> <!-- never editable -->
            <mx:DataGridColumn dataField="Artist"/> <!-- always editable -->
            <mx:DataGridColumn dataField="Album"/> <!-- always editable -->
            <mx:DataGridColumn dataField="Price"/> <!-- conditionally editable if associated ID is 0 -->
        </mx:columns>       
    </mx:DataGrid>  
</s:Application>

Example of making a value in a row conditionally editable depending upon an associated value in the row. In this case, we want the "Price" value to be editable only when the associated ID value is 0. As well, the ID value itself is never editable, and all other columns are always editable.

Also note that if you reorder the columns, the editability rules remain intact.