The following code shows a model dialog as page loading.
<!DOCTYPE HTML>
<html>
<head>
<link href="http://java2s.com/style/bootstrap.min.css" rel="stylesheet">
<!-- w w w .j a va2s .c om-->
<script src="http://java2s.com/style/jquery-1.8.0.min.js"></script>
<script src="http://java2s.com/style/bootstrap.min.js"></script>
</head>
<body style='margin: 20px;'>
<div id="myModal" class="modal fade in" tabindex="-1" role="dialog"
aria-labelledby="myModalLabel" aria-hidden="false"
style="display: block;">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal"
aria-hidden="true">?</button>
<h4 class="modal-title" id="myModalLabel">Modal Heading</h4>
</div>
<div class="modal-body">
<h4>Text in a modal</h4>
<p>Duis mollis, est non commodo luctus, nisi erat porttitor
ligula.</p>
<h4>Popover in a modal</h4>
<p>
This <a href="#" role="button"
class="btn btn-default popover-test" title=""
data-content="And here's some amazing content. It's very engaging. right?"
data-original-title="A Title">button</a> should trigger a popover
on click.
</p>
<h4>Tooltips in a modal</h4>
<p>
<a href="#" class="tooltip-test" title=""
data-original-title="Tooltip">This link</a> and <a href="#"
class="tooltip-test" title="" data-original-title="Tooltip">that
link</a> should have tooltips on hover.
</p>
<hr>
<h4>Overflowing text to show scroll behavior</h4>
<p>Cras mattis consectetur purus sit amet fermentum. Cras justo
odio, dapibus ac facilisis in, egestas eget quam. Morbi leo risus,
porta ac consectetur ac, vestibulum at eros.</p>
<p>Praesent commodo cursus magna, vel scelerisque nisl
consectetur et. Vivamus sagittis lacus vel augue laoreet rutrum
faucibus dolor auctor.</p>
<p>Aenean lacinia bibendum nulla sed consectetur. Praesent
commodo cursus magna, vel scelerisque nisl consectetur et. Donec
sed odio dui. Donec ullamcorper nulla non metus auctor fringilla.</p>
<p>Cras mattis consectetur purus sit amet fermentum. Cras justo
odio, dapibus ac facilisis in, egestas eget quam. Morbi leo risus,
porta ac consectetur ac, vestibulum at eros.</p>
<p>Praesent commodo cursus magna, vel scelerisque nisl
consectetur et. Vivamus sagittis lacus vel augue laoreet rutrum
faucibus dolor auctor.</p>
<p>Aenean lacinia bibendum nulla sed consectetur. Praesent
commodo cursus magna, vel scelerisque nisl consectetur et. Donec
sed odio dui. Donec ullamcorper nulla non metus auctor fringilla.</p>
<p>Cras mattis consectetur purus sit amet fermentum. Cras justo
odio, dapibus ac facilisis in, egestas eget quam. Morbi leo risus,
porta ac consectetur ac, vestibulum at eros.</p>
<p>Praesent commodo cursus magna, vel scelerisque nisl
consectetur et. Vivamus sagittis lacus vel augue laoreet rutrum
faucibus dolor auctor.</p>
<p>Aenean lacinia bibendum nulla sed consectetur. Praesent
commodo cursus magna, vel scelerisque nisl consectetur et. Donec
sed odio dui. Donec ullamcorper nulla non metus auctor fringilla.</p>
</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>
<!-- /.modal-content -->
</div>
<!-- /.modal-dialog -->
</div>
</body>
</html>