How to make Popup or Modal using Bootstrap?

try this very simple code to make a popup :

<!-- Start Button trigger modal -->

<button type="button" class="btn btn-primary btn-lg" data-toggle="modal" data-target="#myModal">

  Launch demo modal

</button>

<!-- Modal -->

<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel">

  <div class="modal-dialog" 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">Modal title</h4>

      </div>

      <div class="modal-body">

        ...your text or form here…

      </div>

      <div class="modal-footer">

        <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>

        <button type="button" class="btn btn-primary">Save changes</button>

      </div>

    </div>

  </div>

</div>

<!-- End Button trigger modal -->

<script>

$('#myModal').on('shown.bs.modal', function () {

  $('#myInput').focus()

})

</script>