RPM page5 eventlistener

<script>
  waitforformready();

  function waitforformready() {
    let myform = document.querySelector("form");

    if ( myform == null ) {
      setTimeout(waitforformready, 1000);
    } else {
      myform.addEventListener('submit', setautomagicallink);
    }
  }

  function setautomagicallink(event) {
    let myaid = document.querySelector("[name='custom aid']").value.trim();
    let mylink = document.querySelector("[name='custom link']").value.trim();
    let myaffiliate = document.querySelector("[name='custom affiliate']").value.trim();
    let mymailingboss = document.querySelector("[name='custom mailingboss']").value.trim();

    let myautomagicallink = 'https://w.rapidprofitmachine.com/?affiliate='+encodeURIComponent(myaffiliate)+'&aid='+myaid+'&mailingboss='+mymailingboss+'&link='+encodeURIComponent(mylink);

    let myinput = document.querySelector("[name='custom automagicallink']");
    jameschangevalue(myinput,myautomagicallink);
    myinput.setAttribute('value', myautomagicallink);

    return true;
  }

  function jameschangevalue(el,value){
      var nativeInputValueSetter = Object.getOwnPropertyDescriptor(
        window.HTMLInputElement.prototype,
        "value"
      ).set;
      nativeInputValueSetter.call(el, value);
      var inputEvent = new Event("input", { bubbles: true });
      el.dispatchEvent(inputEvent);
  }
</script>