jquery-validation · Arkni · Oct 10, 2018 · Sep 24, 2018 · Oct 9, 2018 · Oct 9, 2018
diff --git a/src/additional/abaRoutingNumber.js b/src/additional/abaRoutingNumber.js
@@ -0,0 +1,31 @@
+/**
+ * This is used in the United States to process payments, deposits,
+ * or transfers using the Automated Clearing House (ACH) or Fedwire
+ * systems. A very common use case would be to validate a form for
+ * an ACH bill payment.
+ */
+$.validator.addMethod( "abaRoutingNumber", function( value ) {
+	var checksum = 0;
+	var tokens = value.split( "" );
+	var length = tokens.length;
+
+	// Length Check
+	if ( length !== 9 ) {
+		return false;
+	}
+
+	// Calc the checksum
+	// https://en.wikipedia.org/wiki/ABA_routing_transit_number
+	for ( var i = 0; i < length; i += 3 ) {
+		checksum +=	parseInt( tokens[ i ], 10 )     * 3 +
+					parseInt( tokens[ i + 1 ], 10 ) * 7 +
+					parseInt( tokens[ i + 2 ], 10 );
+	}
+
+	// If not zero and divisible by 10 then valid
+	if ( checksum !== 0 && checksum % 10 === 0 ) {
+		return true;
+	}
+
+	return false;
+}, "Please enter a valid routing number." );
diff --git a/test/additional/abaRoutingNumber.js b/test/additional/abaRoutingNumber.js
@@ -0,0 +1,23 @@
+QUnit.test( "abaRoutingNumber", function( assert ) {
+	var method = methodTest( "abaRoutingNumber" );
+
+	// Bounds
+	assert.ok( !method( "12345678" ), "Invalid routing number." );
+	assert.ok( !method( "1234567890" ), "Invalid routing number." );
+
+	// Checksum
+	assert.ok( !method( "123456789" ), "Invalid routing number." );
+	assert.ok( method( "123456780" ), "Valid routing number." );
+	assert.ok( method( "123123123" ), "Valid routing number." );
+	assert.ok( method( "021000021" ), "Valid routing number." );
+	assert.ok( method( "011401533" ), "Valid routing number." );
+	assert.ok( method( "091000019" ), "Valid routing number." );
+
+	// Garbage
+	assert.ok( !method( "asdf" ), "Invalid routing number." );
+	assert.ok( !method( "asdfasdfa" ), "Invalid routing number." );
+	assert.ok( !method( "&&abcdefg" ), "Invalid routing number." );
+	assert.ok( !method( "||abcdefg" ), "Invalid routing number." );
+	assert.ok( !method( "!abcdefgh" ), "Invalid routing number." );
+	assert.ok( !method( "abcd+efgh" ), "Invalid routing number." );
+} );
diff --git a/test/index.html b/test/index.html
@@ -17,6 +17,7 @@
 	<script src="methods.js"></script>
 	<script src="additional/creditcard.js"></script>
 	<script src="additional/netmask.js"></script>
+	<script src="additional/abaRoutingNumber.js"></script>
 	<script src="aria.js"></script>
 	<script src="error-placement.js"></script>
 </head>