JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" name="part_id" size="20" value="PW-">

JavaScript

$(document).ready(function(){
    var el = $("input:text").get(0);
    var elemLen = el.value.length;                                    el.selectionStart = elemLen;
   el.selectionEnd = elemLen;
    el.focus();
});