source: main/waeup.sirp/trunk/src/waeup/sirp/widgets/table.txt @ 5411

waeup.sirp.widgets
******************

Widgets for the WAeUP SRP.


.. :doctest:
.. :layer: waeup.sirp.testing.WAeUPSIRPUnitTestLayer

Tables
======

    >>> from waeup.sirp.widgets.table import Col, Table
    >>> id = Col(
    ...       header='Id', width=100, sortable=True, type='int',
    ...       data = (1, 2, 3))
    >>> mycol1 = Col(
    ...       header='Column 1', width=100, sortable=True,
    ...       data = ('bli', 'bla', 'blub'))

    >>> mycol2 = Col(
    ...     header='Column 2', width=100, sortable=True,
    ...     data = ('schwi', 'schwa', 'schwafel'))

    >>> table = Table('My Table', cols=(id, mycol1, mycol2))
    >>> print table.renderHTML()
    <div id="mytable-tablecontainer"><table id="mytable-table"><thead><tr><th>Id</th><th>Column 1</th><th>Column 2</th></tr></thead>
    ...<tbody><tr>
    ...<td>1</td><td>bli</td><td>schwi</td>
    ...</tr><tr>
    ...<td>2</td><td>bla</td><td>schwa</td>
    ...</tr><tr>
    ...<td>3</td><td>blub</td><td>schwafel</td>
    ...</tr></tbody></table></div>

    >>> print table.internal_title
    mytable

YUITable
--------

A YUI table extends a regular table by adding some JavaScript
code-generation facilities suitable for rendering YUI based
datatables. Futhermore they provide a `need` method, which includes
all needed YUI scripts and stylesheets.


    >>> from waeup.sirp.widgets.table import YUITable
    >>> table = YUITable('My YUI Table', cols=(id, mycol1, mycol2))
    >>> print table.getJSTableCode()
    <BLANKLINE>
    YAHOO.util.Event.addListener(window, "load", function() {...
    ...
    draggableColumns:true });
    });

Naturally, YUITable objects are suited for use by views.


YUIStaticTableView
==================

This is a view named ``yuistatictables.js`` which from a users'
perspective can be used like a static file. It is, however, not
static, but returns the JavaScript code suitable for a given table.

We define some content object that contains a table for which we want
the JavaScript to be generated:

    >>> class SomeContent(object):
    ...   mytable = table

    >>> obj = SomeContent()

Now we need an adapter, that knows how to get a table from this kind
of object. The YUIStaticTableView looks up such an adapter for a given
context to find a table to manage. The adapter has to implement
`ITableProvider` from `waeup.sirp.widgets.interfaces` and should provide a
`getTables` method.

We define and register such an adapter using grok:

    >>> import grok
    >>> from waeup.sirp.widgets.interfaces import ITableProvider
    >>> class TableAdapter(grok.Adapter):
    ...   grok.context(SomeContent)
    ...   grok.provides(ITableProvider)
    ...
    ...   def getTables(self):
    ...     # We know that our context stores a table in `mytable`
    ...     return (self.context.mytable,)
    >>> grok.testing.grok_component('TableAdapter', TableAdapter)
    True

Now let's get a view on the object defined above. We want the view
named ``yuistatictables.js``:

    >>> from zope.publisher.browser import TestRequest
    >>> from zope.component import getMultiAdapter
    >>> from zope.interface import Interface
    >>> view = getMultiAdapter((obj, TestRequest()), Interface, 
    ...                        name='yuistatictables.js')
    >>> view
    <waeup.sirp.widgets.table.YUIStaticTableView object at 0x...>

When we call the view we get pure JavaScript:

    >>> print view()
    <BLANKLINE>
    YAHOO.util.Event.addListener(window, "load", function() {
    ...
    draggableColumns:true });
    });

Table views for objects that have no table
------------------------------------------

What happens, when no `ITableProvider` can be found for an object? The
view will return an empty string.

Let's try this with a simple object for which no adapter is
registered. We can get the view:

    >>> obj = object()
    >>> view = getMultiAdapter((obj, TestRequest()), Interface, 
    ...                        name='yuistatictables.js')
    >>> view
    <waeup.sirp.widgets.table.YUIStaticTableView object at 0x...>

But if we call this adapter, we will get an empty result, because
there is no ITableProvider adapter registered for the 'viewed' object:

    >>> view()
    ''