Attributes

"known_values"

An hash reference, recording valid menu values, as tuples (value => count), with count set to the number of times the same value is re-used amongst the proposed options.

"multiple"

Whether menu allows multiple selections.

"option_labels"

A list reference, providing the labels to choose from, in the order in which they appear. The retained labels are either the content of the <OPTION> elements, or the value of their "label" attribute, when specified.

"option_values"

A list reference, providing the underlying values that the user chooses from when he selects labels, in the order in which they appear in the menu.

"selected"

An hash reference, whose keys are the selected values.

"selected_count"

The amount of currently selected items.

Attribute Setting

"select" value

Mark the option value as selected. If "multiple" is false, any previously selected value is automatically unselected.

Note that this takes a value, not a label.

"unselect" value

Unselect an option value. It is not possible to do that on a popup menu: you must "select" another item to unselect any previously selected one.

Menu Probing

"is_selected" value

Test whether an option value is currently selected or not. This is not testing a label, but a value, which is what the script will get back eventually: labels are there for human consumption only.

Widget Classification Predicates

There is an additional predicate to distinguish between a popup menu (single selection mandatory) from a scrolling list (multiple selection allowed, and may select nothing).

"is_popup"

Returns true for a popup menu.

Miscellaneous Features

Although documented, those features are more targetted for internal use...

"set_selected" value, flag

Change the selection status of an option value.

You should use the "select" and "unselect" convenience routines instead of calling this feature.