Setting boundary limits for a draggable object

Question

I have two elements:

1. A parent of fixed height, overflow:hidden

2. Its child, of larger fixed height.

<style type="text/css">
    .myList {list-style:none; margin:0px; padding:1px;}
    .myList li{ height:50px;  margin:4px; padding:2px;}
    .dragPanel {height:230px; border:solid; overflow:hidden;}
</style>

<div class="dragPanel">
    <ul class="myList">
        <li>1</li>
        <li>2</li>
        ...   ....
        <li>8</li>
        <li>9</li>
    </ul>
</div>

I want to be able to drag the list up and down within the parent div. I am using the jquery ui draggable plugin to achieve verticle dragging, but I am unsure how to constrain the list within the parent div.

<script type="text/javascript" src="http://jqueryui.com/latest/jquery-1.3.2.js"></script>
<script type="text/javascript" src="http://jqueryui.com/latest/ui/ui.core.js"></script>
<script type="text/javascript" src="http://jqueryui.com/latest/ui/ui.draggable.js"></script>

<script type="text/javascript">
    $(document).ready(function() {
        $('.dragPanel').addClass("hover");
        $('.myList').draggable({ axis: 'y' });
    });
</script>

How would I go about setting verticle upper and lower limits for the posistion of the list?

Answer 1

Use the containment option:

$('.myList').draggable({
    axis: 'y',
    containment: 'parent'
});