Hi William, can I ask what you are trying to accomplish? I'm assuming that you want to make the field read-only for other pieces of the process later on (for example, to make the drop-down read-only when a reviewer sees that field when he/she loads the form later in the business process).

When you submit a form, the actual HTML of the form doesn't save to the repository, only the variables that you capture from the form. In later steps of the process, when the form saves with the data populated or displays data previously entered, that's because the server is pushing the variables to a new instance of the HTML form and displaying that. So no changes to the HTML made with JavaScript make it past the submit button on a form, only the data captured in variables.

If you want to make the field read-only during later steps of the process, you will need to a) find some other condition to grab onto (like, "If the reject button exists, make these fields read-only") or b) use hidden fields and JS to populate different fields which are read-only.

Hope that helps, and let me know if I'm off the mark.