The Selection(L) calling sequence displays a Maplet application that prompts the user to select one or more items from a list.  It returns an expression sequence that corresponds to the selected items.

If no selection is made and OK is pressed, then an error results. If Cancel is pressed, then NULL is returned.

Any elements of L that are of type string are displayed as strings. Other elements are displayed by using the MathMLViewer element.

The Selection sample Maplet worksheet describes how to write a Maplet application that behaves similarly to this routine by using the Maplets[Elements] package.

The opts argument can contain one or more of the following equations that set Maplet application options.

caption = string

Specifies the line that prompts the user to make a selection. By default, the caption is Make a selection:.

default = posint or list(posint)

Specifies item(s) initially selected. By default, none of the items of L is selected. However, if the option unique is set to true, by default, the first item in L is selected. Only one item can be specified if the option unique is set to true.

title = string

Specifies the Maplet application title.  By default, the title is Selection.

unique = true or false

If this option is set to true, the user can select only one of the items.

$\mathrm{with}\left(\mathrm{Maplets}\left[\mathrm{Examples}\right]\right)\:$

$\mathrm{Selection}\left(\left[a\,b\,c\,d\right]\right)$

$3,4$