ABA Routing Number Checksum

David Leppek Nov 14, 2005

This script will validate an ABA routing number according to a given algorithm. (Although the number may be valid, it may not be actually assigned to a financial institution.)

The JavaScript Source: Forms: ABA Routing Number Checksum

Simply click inside the window below, use your cursor to highlight the script, and copy (type Control-c or Apple-c) the script into a new file in your text editor (such as Note Pad or Simple Text) and save (Control-s or Command-s). The script is yours!!!

<!-- TWO STEPS TO INSTALL ABA ROUTING NUMBER CHECKSUM:

1.  Copy the coding into the HEAD of your HTML document
  2.  Add the last code into the BODY of your HTML document  -->

<HEAD>

<!--
function ABAMod10(aba) { //v2.0
  var valid = "0123456789";
  var len = aba.length;
  var bNum = true;
  var iABA = parseInt(aba);
  var sABA = aba.toString();
  var url = "abaDisplay2.asp?aba=" + sABA;
  var iTotal = 0;
  var bResult = false;
  var temp;

//alert(aba);
  for (var j=0; j<len; j++) {
  temp = "" + document.abaForm.aba.value.substring(j, j+1);
  if (valid.indexOf(temp) == "-1") bNum = false;
  }
  if(!bNum){alert("Not a Number");}
  if(len !=0) {  // incase they omit the number entirely.
    if(len != 9) {
      alert("This is not a proper ABA length");
    } else {
      for (var i=0; i<len; i += 3) {
        iTotal += parseInt(sABA.charAt(i),     10) * 3
          +  parseInt(sABA.charAt(i + 1), 10) * 7
          +  parseInt(sABA.charAt(i + 2), 10);
        }
    if (iTotal != 0 && iTotal % 10 == 0){
      bResult = true;
      // used for AJAX posting of data
      // get(this.parentNode);
    } else {
      alert("This is NOT a valid ABA Routing Number!");
      bResult = false;
    }
  }
  } else {
    // zero length do nothing
  }
  //  reset the frame detail.
  if (!bResult) {
    // used for AJAX posting of data
    //document.getElementById('myspan').innerHTML = "";
  } else {
    alert("This COULD BE a valid ABA Routing Number!");
  }
  // end of not shown in page version of code
  return bResult;
}
// -->
</script>
</HEAD>

<BODY>

<form name="abaForm" onSubmit="javascript:return ABAMod10(document.abaForm.aba.value);">
<table width="400" border="0" cellspacing="0" cellpadding="5" align="center">
  <tr>
    <td width="150">ABA Routing Number: </td>
    <td width="150"><input name="aba" type="text" value="123123123" size="15" maxlength="9" id="aba">
    </td>
  </tr>
  <tr>
    <td colspan="2" align="center"><input type="submit" name="Button" value="TEST ABA NUMBER" >
    </td>
  </tr>
</table>
</form>

<p><center>
<font face="arial, helvetica" size"-2">Free JavaScripts provided<br>
by <a href="http://javascriptsource.com">The JavaScript Source</a></font>
</center><p>

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ABA Routing Number Checksum

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