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/**
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* This is used in the United States to process payments, deposits,
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* or transfers using the Automated Clearing House (ACH) or Fedwire
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* systems. A very common use case would be to validate a form for
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* an ACH bill payment.
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*/
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$.validator.addMethod( "abaRoutingNumber", function( value ) {
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var checksum = 0;
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var tokens = value.split( "" );
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var length = tokens.length;
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// Length Check
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if ( length !== 9 ) {
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return false;
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}
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// Calc the checksum
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// https://en.wikipedia.org/wiki/ABA_routing_transit_number
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for ( var i = 0; i < length; i += 3 ) {
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checksum += parseInt( tokens[ i ], 10 ) * 3 +
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parseInt( tokens[ i + 1 ], 10 ) * 7 +
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parseInt( tokens[ i + 2 ], 10 );
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}
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// If not zero and divisible by 10 then valid
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if ( checksum !== 0 && checksum % 10 === 0 ) {
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return true;
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}
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return false;
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}, "Please enter a valid routing number." );
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