How to add/append random number to url hidden field via javascript

This topic was mentioned in other threads but they were either incomplete or incrorrect.

Here is the right way to add a random number to a hidden field after form is submitted.

1. Add the following script to

    <script type="text/javascript">
   

   document.addEventListener(“DOMContentLoaded”, function(event) {
   var randomNum = ‘’;
   randomNum += Math.round(Math.random() * (100000 - 10000) + 10000);
   var elem = document.getElementById(“external_id”).value = randomNum;

   var domain = window.location.host + window.location.pathname;
   document.getElementById(“external_id”).value = randomNum;
   });

      </script>
   

2. Add a hidden field in your form and give it an id name

3. In the javascript replace the 2 instances that say “external_id” to your hidden field name

The script will generate a number between 10,000 - 100,000