Use itemEditEnd event to ensure that the user did not enter an empty String

     

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<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
    <mx:Script>
        
        import mx.controls.TextInput;
        import mx.events.DataGridEvent;
        import mx.events.DataGridEventReason;
        import mx.formatters.NumberFormatter;
        import mx.collections.ArrayCollection;
        [Bindable]
        private var initDG:ArrayCollection = new ArrayCollection([
            {Artist:'A', Album:'AA',Price:11.99},
            {Artist:'B', Album:'BB',Price:11.99 }
        ]);
        private var myFormatter:NumberFormatter=new NumberFormatter();
        public function formatData(event:DataGridEvent):void {
            if (event.reason == DataGridEventReason.CANCELLED){
                return;
            }
            var newData:String= TextInput(event.currentTarget.itemEditorInstance).text;
            if(newData == ""){
                event.preventDefault();
                TextInput(myGrid.itemEditorInstance).errorString="Enter a valid string.";
            }
        }
      
    </mx:Script>
    <mx:DataGrid id="myGrid" dataProvider="{initDG}" editable="true"
        itemEditEnd="formatData(event);">
        <mx:columns>
            <mx:DataGridColumn dataField="Artist" />
            <mx:DataGridColumn dataField="Album" />
            <mx:DataGridColumn dataField="Price" />
        </mx:columns>
    </mx:DataGrid>
</mx:Application>

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3.	Using a DateField or ComboBox control as a drop-in item editor
4.	Define an event listener for the itemEditEnd event that uses the NumberFormatter class to format cell value
5.	To prevent cell editing, call the preventDefault() method from within your event listener
6.	Show an event listener for itemEditEnd event using column index, row index, and value properties
7.	Inline CheckBox Editor With Offsets
8.	Returning data from an item editor
9.	Use mx.controls.NumericStepper as DataGridColumn editor
10.	use to define an inline item editor
11.	inline item editor contains a single control that supports the data property
12.	DataGrid Dropin Editor
13.	Inline DataGrid Editor
14.	Cancel the edit action and maintain edit state
15.	Get cell index in cell onEditEnd event
16.	Edited Row and column
17.	Item Editor Size and Position
18.	Item Edit Beginning Event
19.	Item Edit End Event

Use itemEditEnd event to ensure that the user did not enter an empty String : DataGrid ItemEditor « Grid « Flex

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