Subversion-Projekte lars-tiefland.zeldi.de_alt

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Revision Autor Zeilennr. Zeile
2 lars 1 
// https://jqueryvalidation.org/creditcard-method/
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// based on https://en.wikipedia.org/wiki/Luhn_algorithm
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$.validator.addMethod( "creditcard", function( value, element ) {
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	if ( this.optional( element ) ) {
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		return "dependency-mismatch";
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	}
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	// Accept only spaces, digits and dashes
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	if ( /[^0-9 \-]+/.test( value ) ) {
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		return false;
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	}
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	var nCheck = 0,
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		nDigit = 0,
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		bEven = false,
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		n, cDigit;
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	value = value.replace( /\D/g, "" );
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	// Basing min and max length on
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	// https://dev.ean.com/general-info/valid-card-types/
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	if ( value.length < 13 || value.length > 19 ) {
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		return false;
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	}
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	for ( n = value.length - 1; n >= 0; n-- ) {
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		cDigit = value.charAt( n );
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		nDigit = parseInt( cDigit, 10 );
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		if ( bEven ) {
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			if ( ( nDigit *= 2 ) > 9 ) {
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				nDigit -= 9;
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			}
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		}
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		nCheck += nDigit;
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		bEven = !bEven;
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	}
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	return ( nCheck % 10 ) === 0;
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}, "Please enter a valid credit card number." );