สอบถามการใช้ jsignature บน Modal ไม่ทำงาน รบกวนทีครับ

  <script type="text/javascript">
    $(document).on('show.bs.modal',function (e) {    
      $("#signature").jSignature(); 
      $("#signature").resize();
    });
  </script>

/////////อยู่ใน loop while
<!-- Modal Signature -->
<div class="modal fade bs-example-modal-lg" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" data-backdrop="static" data-keyboard="false" id="ModalSign<?php echo $i; ?>" >
  <div class="modal-dialog modal-lg" role="document">
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>
        <h4 class="modal-title" id="myModalLabel">ลงลายเซ็น</h4>
      </div>
      <div class="modal-body">
        <div id="signature" class="signature"></div>
        <div id="result"></div>
        <!-- <input type="hidden" id="hiddenSigData" name="hiddenSigData"/> -->
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-warning" onclick="$('#signature').jSignature('clear')">ล้าง</button>
        <button type="button" class="btn btn-default" data-dismiss="modal">ยกเลิก</button>
        <button type="button" class="btn btn-success sign" data-id="<?php echo $result['id']; ?>">บันทึก</button>
      </div>
    </div>
  </div>
</div>
<!-- End Modal Signature -->