Untitled

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>Remove Commas</title>
</head>
<body>
  <p>Field 1 (No Commas): <input type="text" id="test1" class="no-commas"></p>
  <p>Field 2 (Commas OK): <input type="text" id="test2"></p>
  <p>Field 3 (No Commas): <input type="text" id="test3" class="no-commas"></p>

<p>We take commas out of all fields with the css class "no-commas".</p>

<script>
  var list = document.getElementsByClassName("no-commas");
for (var i = 0; i < list.length; i++) {
    list[i].onblur = function() {
      this.value = this.value.replace(/,/g, '');
    }
}
</script>
</body>
</html>