.. title:: MochiKit.Sortable - sortable with drag and drop lists

Name
====

MochiKit.Sortable - sortable with drag and drop lists


Synopsis
========

::

    <ul id="dnd_sortable">
        <li>mochibot.com</li>
        <li>pythonmac.org</li>
        <li>undefined.org</li>
        <li>python.org</li>
    </ul>
    <script type="text/javascript">
      MochiKit.Sortable.Sortable.create('dnd_sortable');
    </script>


Description
===========

MochiKit.Sortable add a new Sortable object to manipulate easily
drag&drop in lists.


Dependencies
============

- :mochiref:`MochiKit.Base`
- :mochiref:`MochiKit.Iter`
- :mochiref:`MochiKit.DOM`
- :mochiref:`MochiKit.Color`
- :mochiref:`MochiKit.Visual`
- :mochiref:`MochiKit.Signal`
- :mochiref:`MochiKit.DragAndDrop`

Overview
========

MochiKit.Sortable mainly contains the Sortable object offering
facilities to manipulate a list and drag its items to reorder it. It
can also be serialized for being send to server. It is ported from
Scriptaculous_.

.. _Scriptaculous: http://script.aculo.us


API Reference
=============

Objects defined
---------------

:mochidef:`SortableObserver`:

    Observer for DragAndDrop object. You normally don't have to access
    this, only for customization purpose.

    *Availability*:
        Available in MochiKit 1.4+


:mochidef:`Sortable.create(element [, options])`:

    Create a new Sortable. Usually you'll call it with a UL element,
    but it can be customized with options to use something else.

    You have the following options:

    ================= ==================
    element           element
    tag               'li'
    dropOnEmpty       false
    overlap           'vertical'
    constraint        'vertical'
    containment       element
    handle            false
    only              false
    hoverclass        null
    ghosting          false
    scroll            false
    scrollSensitivity 20
    scrollSpeed       15
    format            /^[^_]*_(.*)$/
    onChange          MochiKit.Base.noop
    onUpdate          MochiKit.Base.noop
    tree              false
    treeTag           'ul'
    ================= ==================

    ``tag``:
        Name of the tag used to make the draggable elements. It matches all
        the childNodes of the Sortable element with this tag.

    ``only``:
        Class or array of classes used to filter the children, combined with
        the tag criteria.

    ``format``:
        Regular expression which serves as a match filter for serialization,
        on children' ids. For example, with the default value, you'll get
        ['1', '2', '3', '4'] with ids ['sort_1', 'sort_2', 'sort_3', 'sort_4'].

    ``onChange``:
        Callback called when an element moves between others in the Sortable.
        It's called for *each* movements, even if you don't release the mouse.

    ``onUpdate``:
        Callback called when the order changes in the Sortable. It's called
        only if the Sortable is modified, after you dropped an element.

    ``tree``:
        Option for creating a Sortable tree. It's an experimental
        setting, that can be very slow even with a few elements. You
        can customize its behaviour with the ``treeTag`` option, that
        defines the node used to make branches in your tree (that
        contains leaves).

    Other options are passed to the Draggables and Droppables objects created.
    Refer to :mochiref:`MochiKit.DragAndDrop` for more information.

    A bug with Internet Explorer rendering engine can cause a problem with the
    default effect used on start (the symptom being that the rows vanish).
    If you encounter this problem, pass :mochiref:`MochiKit.Base.noop`
    as the ``starteffect`` option.

    *Availability*:
        Available in MochiKit 1.4+


:mochidef:`Sortable.destroy(element)`:

    Destroy a previously created sortable. It prevents further use of
    the Sortable functionnality on the element, unless recreated.

    *Availability*:
        Available in MochiKit 1.4+


:mochidef:`Sortable.serialize(element [, options])`:

    Serialize the content of a Sortable. Useful to send this content
    through a XMLHTTPRequest. The options overrides the ones of the Sortable
    only for the serialization.

    ====== ==========================================
    tag    tag from the Sortable
    only   only from the Sortable
    name   id of the element
    format format of the Sortable or /^[^_]*_(.*)$
    ====== ==========================================

    *Availability*:
        Available in MochiKit 1.4+


Authors
=======

- Thomas Herve <therve@gmail.com>
- Bob Ippolito <bob@redivi.com>
- Originally adapted from Script.aculo.us <http://script.aculo.us/>


Copyright
=========

Copyright 2005 Bob Ippolito <bob@redivi.com>.  This program is
dual-licensed free software; you can redistribute it and/or modify it
under the terms of the `MIT License`_ or the `Academic Free License
v2.1`_.

.. _`MIT License`: http://www.opensource.org/licenses/mit-license.php
.. _`Academic Free License v2.1`: http://www.opensource.org/licenses/afl-2.1.php

Portions adapted from `Scriptaculous`_ are available under the terms
of the `MIT License`_.

.. _`Apache License, Version 2.0`: http://www.apache.org/licenses/LICENSE-2.0.html