The following example shows how you can create a credit card validator using the CreditCardValidator and CreditCardValidatorCardType classes.

Full code after the jump.

A loyal reader asked in a comment how one could go about creating a credit card validator using ActionScript instead of MXML. Peter loves his readers, so behold, my solution…

The following example shows how you can create a credit card validator using the CreditCardValidator and CreditCardValidatorCardType classes.

Full code after the jump.

View MXML

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2007/10/19/creating-a-credit-card-validator-in-actionscript/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white"
        creationComplete="init();">

    <mx:Style>
        global {
            modalTransparencyBlur: 0;
            modalTransparency: 0.4;
            modalTransparencyDuration: 250;
        }
    </mx:Style>

    <mx:Script>
        <![CDATA[
            import mx.controls.Alert;
            import mx.events.ValidationResultEvent;
            import mx.styles.StyleManager;
            import mx.validators.CreditCardValidator;
            import mx.validators.CreditCardValidatorCardType;

            private var ccVal:CreditCardValidator;
            private var globalStyle:CSSStyleDeclaration;

            private function init():void {
            	/* Initialize credit card validator. */
                ccVal = new CreditCardValidator();
                ccVal.cardNumberSource = cc;
                ccVal.cardNumberProperty = "cardNumber";
                ccVal.cardTypeSource = cc;
                ccVal.cardTypeProperty = "cardType";
                ccVal.addEventListener(ValidationResultEvent.VALID, isValid);
                ccVal.addEventListener(ValidationResultEvent.INVALID, isInvalid);
                /* Create reference to global style. */
                globalStyle = StyleManager.getStyleDeclaration("global");
            }

            private function isValid(evt:ValidationResultEvent):void {
                globalStyle.setStyle("modalTransparencyColor", "green");
                Alert.show("you're valid", evt.type);
            }

            private function isInvalid(evt:ValidationResultEvent):void {
                globalStyle.setStyle("modalTransparencyColor", "red");
                Alert.show(evt.message, evt.type);
            }
        ]]>
    </mx:Script>

    <mx:Model id="cc">
        <card>
            <cardNumber>{cardNumber.text}</cardNumber>
            <cardType>{cardType.selectedItem.data}</cardType>
        </card>
    </mx:Model>

    <mx:Array id="ccType">
        <mx:Object label="American Express"
                data="{CreditCardValidatorCardType.AMERICAN_EXPRESS}" />
        <mx:Object label="Diners Club"
                data="{CreditCardValidatorCardType.DINERS_CLUB}" />
        <mx:Object label="Discover"
                data="{CreditCardValidatorCardType.DISCOVER}" />
        <mx:Object label="Master Card"
                data="{CreditCardValidatorCardType.MASTER_CARD}" />
        <mx:Object label="Visa"
                data="{CreditCardValidatorCardType.VISA}" />
    </mx:Array>

    <mx:Form>
        <mx:FormItem label="Card number:" required="true">
            <mx:TextInput id="cardNumber"
                    restrict="[0-9]" />
        </mx:FormItem>
        <mx:FormItem label="Card type:" required="true">
            <mx:ComboBox id="cardType"
                    dataProvider="{ccType}"
                    prompt="Please select a credit card type."/>
        </mx:FormItem>
        <mx:FormItem>
        <mx:Button label="Validate"
                click="ccVal.validate();" />
        </mx:FormItem>
    </mx:Form>

</mx:Application>

View source is enabled in the following example.

You can test the credit card validation with the following information:
Card number: 4111111111111111
Card type: Visa