PHP variable:

<?php $course_details_url_back = site_url("home/lesson/".slugify($course_details['title'])."/".$course_id); ?>

script do action for form:

$(document).on('submit','#form_create_user',function(e){
    e.preventDefault();
    var fd = new FormData(this);
    var obj = $(this);
    fd.append('course_id', "<?php echo $this->uri->segment(4); ?>");
    obj.find('input[type="submit"]').val("Tworzenie...")
    $.ajax({
        url: $(this).attr("action"),
        data: fd,
        cache: false,
        processData: false,
        contentType: false,
        type: 'POST',
        success: function (dataofconfirm) {
            // do something with the result
           // obj.find('input[type="submit"]').val("Confirm user")
        }
    });
    $.ajax({
        url: "<?php echo site_url('home/saveValues/'); ?>",
        data: fd,
        cache: false,
        processData: false,
        contentType: false,
        type: 'POST',
        success: function (dataofconfirm) {
            // do something with the result
            toastr.success("Success created user.");
            obj.find('input[type="submit"]').val("Potwierdź")
        }
    });
  })

After submit form I need do above actions and also I need to implement to above code refresh page on submit form and back to url.

For this I've separate code:

  document.getElementById("form_create_user").onsubmit = function(){
    window.location.replace("<?php echo $course_details_url_back; ?>");
}

But can anyone help me implement this to current one code?