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This example demonstrates the
XML we are going to use:
"A Grouped List" default="1" class="Some CSS">
Group 1
Value 1
Value 2
Value 3

Group 2
Value 4
Value 5


Chapter 4
[ 97 ]
We use nested group tags to group the different options together. The option tags
are identical to those used by JElementList. For a complete description of menu select
lists, please refer to http://www.w3schools.com/tags/tag_optgroup.asp.
To build the JElementMenus class, there are two things we should always do when
defining JElement subclasses: override the fetchElement() method and set the
_name property.
To implement our fetchElement() method we will use the static JHTMLSelect
class; this class is used to build select lists and menu select lists. There are two
methods that we need to be aware of: JHTMLSelect::option() and JHTMLSelect::
genericList().


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