jQuery UI Sortable - Disable sideways movement

Question

With the jQuery UI's sortable function, a user can move the div in any direction. I only want the user to be able to drag it up and down. How would I go about doing this?

Thanks in advance.

Answer 1

Specific to sortable:

http://api.jqueryui.com/sortable/#option-axis

$( ".selector" ).sortable({ axis: "y" });

Answer 2

Try something like this:

$('#items_wrapper').sortable({
    axis: 'y',
    containment: 'parent',
     ...
     ...