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Note that we cast $filter_catid to an integer; this
ensures the value is safe for use with the database.
Before we move on to explain how to implement a search filter, we will quickly
discuss the use of other filters.
So far we have demonstrated how to use grid.state and list.category. There
are many other things on which we might want to filter itemized data. Some of these
are easily available through the list types, for example list.positions. These are
described earlier in the chapter.
If there isn't a suitable list type, we can construct our own filter drop-down
selection boxes using the select types. This is an example of how we might construct
a custom drop-down selection filter form control (it assumes $js is the same as in
the previous examples):
// prepare database
$db =& JFactory::getDBO();
$query = 'SELECT value, text' .
'FROM #__sometable' .
'ORDER BY ordering';
$db->setQuery($query);
// add first 'select' option
$options = array()
$options[] = JHTML::_('select.option', '0', '- '.


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