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Flex: Validating a checkbox using StringValidator

Thought this might help someone. I had a small task to add validation for a “terms and conditions” checkbox for a work project today and after researching a couple of ways to do that (easily), I found this clever trick.

Use the built-in Flex mx:StringValidator!

By pointing to the selected property of the checkbox component, then validating the length of its string value you can effectively validate a checkbox field without having to extend Validator and create your own customized component.

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<mx:StringValidator 
	id="validatorTermsAndConditions"
	source="{chkTermsAndConditions}" 
	required="true" 
	property="selected" 
	maxLength="4" 
	requiredFieldError="You must agree to the Terms and Conditions." 
	tooLongError="You must agree to the Terms and Conditions."/>

Nifty!

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