modal window not showing code example

Example 1: $('#mymodal').modal('show') not working

<script type="text/javascript">
    $(document).ready(function(){
        $("#login-modal").modal("show");
    });
</script>

Example 2: bs modal is working but not visible

<!-- Modal -->
<div id="myModal" class="modal fade" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
  <div class="modal-header">
    <button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
    <h3 id="myModalLabel">Modal header</h3>
  </div>
  <div class="modal-body">
    <p>One fine body…</p>
  </div>
  <div class="modal-footer">
    <button class="btn" data-dismiss="modal" aria-hidden="true">Close</button>
    <button class="btn btn-primary">Save changes</button>
  </div>
</div>

<a class="btn" data-target="#myModel" role="button" data-toggle="modal">Launch demo modal</a>