//Bunlar script kodları
<script>
$(document).ready(function(){
$('div.modal').hide();
$('a.item').click(function () {
var id = $(this).attr("id");
$.ajax({
url: "urun-detay?id="+id,
success: function (data) {
$(".modal-body").text(data);
$('div.modal').show();
}
});
})
});
</script>
//Bunlar modal
<div class="modal fade" id="12" tabindex="-1" role="dialog" aria-labelledby="exampleModalCenterTitle" aria-hidden="true">
  <div class="modal-dialog modal-dialog-centered" role="document">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title" id="exampleModalLongTitle">Modal title</h5>
        <button type="button" class="close" data-dismiss="modal" aria-label="Close">
          <span aria-hidden="true">×</span>
        </button>
      </div>
      <div class="modal-body">
      
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary">Save changes</button>
      </div>
    </div>
  </div>
</div>