User1535942433 posted
Hi polachan,
Accroding to your description and codes,I suggest you could get the value and append the value to the p tag.
More details,you could refer to below codes:
<script>
$(function () {
$("#Button1").on('click', function () {
event.preventDefault();
var value = $("#lblfilename").val();
$("p").append(value);
$("#myModal").modal('show');
})
})
</script>
<asp:Button ID="Button1" runat="server" Text="Button" />
<!-- Modal -->
<div id="myModal" class="modal fade" role="dialog" style="display:none">
<div class="modal-dialog">
<!-- Modal content-->
<div class="modal-content">
<div class="modal-header">
<input type="hidden" id="lblID" />
<input type="hidden" id="lblfilename" value="1111"/>
<button type="button" class="close" data-dismiss="modal">×</button>
<h4 class="modal-title">Confirm Delete</h4>
</div>
<div class="modal-body">
<p>Are you sure to delete the file?</p>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
</div>
</div>
</div>
</div>
Result:

Best regards,
Yijing Sun