Restrict input letter for TextInput

          

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" verticalAlign="middle" horizontalAlign="center">
    <mx:Script>
        
            import mx.controls.Alert;
      
    </mx:Script>
    <mx:Model id="creditcard">
        <card>
            <cardType>{cardTypeCombo.selectedItem.data}</cardType>
            <cardNumber>{creditCardInput.text}</cardNumber>
        </card>
    </mx:Model>
    <mx:Panel title="Data Validation">
        <mx:ComboBox id="cardTypeCombo">
            <mx:dataProvider>
                <mx:Object label="American Express" data="American Express" />
                <mx:Object label="MasterCard" data="MasterCard" />
                <mx:Object label="Visa" data="Visa" />
            </mx:dataProvider>
        </mx:ComboBox>
        <mx:TextInput id="creditCardInput" restrict="1234567890" />
        <mx:Button label="Validate" click="ccv.validate()" />
    </mx:Panel>
    <mx:CreditCardValidator id="ccv"
        cardTypeSource="{creditcard}"
        cardTypeProperty="cardType"
        cardNumberSource="{creditcard}"
        cardNumberProperty="cardNumber"
        cardTypeListener="{cardTypeCombo}"
        cardNumberListener="{creditCardInput}"
        valid="Alert.show('Credit card is valid')" />    
</mx:Application>

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Restrict input letter for TextInput : TextInput Data « Components « Flex

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