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Flex Validators have two properties that you can use to trigger the validator using any kind of events:

The trigger property specifies the component that is generating the event that will triggers the validator. If you don’t specify this property Flex will use the the source property.

The triggerEvent property is used to specify the event that will trigger the validator.
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The ZipCodeValidator class is used to check if the user input corresponds to the zip code format.
Here is the syntax for this class:

<mx:zipcodevalidator allowedFormatChars=" -" 
     domain="US Only | US or Canada"
     invalidCharError="The ZIP code contains invalid characters." 
     invalidDomainError="The domain parameter is invalid. It must be either 'US Only' or 'US or Canada'." 
     wrongCAFormatError="The Canadian ZIP code must be formatted 'A1B 2C3'." 
     wrongLengthError="The ZIP code must be 5 digits or 5+4 digits." 
     wrongUSFormatError="The ZIP+4 extension must be formatted '12345-6789'."></mx:zipcodevalidator>

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SocialSecurityValidator expects a string of digits in the format “NNN-NN-NNNN”. When using the SocialSecurityValidator you can specify the separator. By default, the separator can be a dash or a space.

<mx:socialsecurityvalidator allowedFormatChars=" -"
     invalidCharError="You entered invalid characters in your Social Security number."
     wrongFormatError="The Social Security number must be 9 digits or in the form NNN-NN-NNNN."
     zeroStartError="Invalid Social Security number: the number cannot start with 000."></mx:socialsecurityvalidator>

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The PhoneNumberValidator validator checks if the text enterered by the user represents a phone number or not.

Here is the syntax of the PhoneNumberValidator Flex Validator:

<mx:phonenumbervalidator allowedFormatChars="()- .+" 
      invalidCharError="Invalid characters in your phone number." 
      wrongLengthError="Your telephone number must be at least 10 digits in length."></mx:phonenumbervalidator>

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CurrencyValidator is a Flex Validator that ensures that the text entered by the user represents a valid currency expression.

You can set a minimum value (minValue) and a maximum value (maxValue), you can specify if the amount is negative or not by setting the allowNegative parameter.

Here is a simple example that demonstrates the CurrencyValidator:

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The CreditCardValidator Flex Validator takes two parameters to be set by the user. The first one is the credit card type and the second one is the credit card number. The credit card type can have 5 values:

• Visa
• MasterCard
• Discover
• American Express
• Diners Club

Here is an example that demonstrates how to use the CreditCardValidator Flex Validator:
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The EmailValidator in Flex verifies if a string is an formatted as an email address. The only parameters you can change to the EmailValidator are the error messages that the user receives when the validation found a problem.

Here is the syntax of the EmailValidator:

<mx:emailvalidator invalidCharError="Invalid characters in your email address." 
	invalidDomainError= "The domain in your email address is incorrectly formatted." 
	invalidIPDomainError="The IP domain in your email address is incorrectly formatted." 
	invalidPeriodsInDomainError="The domain in your email address has consecutive periods." 
	missingAtSignError="Missing an at character in your email address." 
	missingPeriodInDomainError="The domain in your email address is missing a period." 
	missingUsernameError="The username in your email address is missing." 
	tooManyAtSignsError="Too many at characters in your email address."></mx:emailvalidator>

Here is an example that checks if a string entered by the user is an email or not:

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The DateValidator helps you validate if the user input is a date or not.

Here is an example that uses the DateValidator Flex Class to validate the text typed in a textinput:
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The NumberValidator is another built in Flex Validator that you can use to validate if a value is a number or not. Here is the syntax for the NumberValidator:
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The StringValidator class is used to simply to validate strings.

The StringValidator class inherits all the attributes of its parent Class, the Validator Class and adds these 4 new tag attributes:
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