NAME

GvaScript.ChoiceList - Dropdown list of choices with navigation

SYNOPSIS

  var choiceList = new GvaScript.ChoiceList(["foo", "bar", "buz"]);
  choiceList.fillContainer($('myChoiceDiv'));

DESCRIPTION

Displays a list of "choices", handles navigation in those choices, and generates events when a choice is highlighted, then selected, or when the list display is cancelled.

At any moment the choiceList is bound to maximum one "container", and highlights exactly one choice in the list.

BEHAVIOUR

Once a choice list is displayed, the user can move the mouse over the list, thus highlighting various choices; then click on the highlighted choice to select it. Alternatively, the user can navigate the list with keys DOWN, UP, HOME, END, and then use either RETURN (for selecting) or ESCAPE (for cancelling).

CONSTRUCTOR

  var choiceList = new GvaScript.ChoiceList(choices, options);

Choices

The choice list must be an array. Each item in the list is either

a plain string

this string will be displayed in the choice list

an inline object

this object is supposed to have a label property, which will be displayed in the choice list. Actually, this is the default name for the property; it can be changed in the constructor options.

The label property may contain rich HTML, i.e. including formatting tags.

Options

The options to construct an choiceList object are :

labelField

Name of the field that contains the HTML to display (default is label).

idForChoices

Prefix that will be used to generate ids for choice elements in the generated HTML. The default is CL_choice, so choice elements will have ids CL_choice.0, CL_choice.1, etc.

keymap

If defined, the choiceList will add rules to the supplied keymap, instead of creating a new one.

classes

Classes that will be assigned to choice elements in the generated HTML. Possible classes are choiceItem (default value CL_choiceItem) and choiceHighlight (default value CL_highlight).

METHODS

fillContainer

  choiceList.fillContainer(someDiv);

This method generates HTML from the choice list, and inserts it in the innerHTML of the supplied container; furthermore, it registers a keymap on that container in order to manage navigation from keyboard (DOWN, UP, etc.).

EVENTS

onHighlight

This event is triggered when a choice in the list is highlighted. The event handler may use event.index to know the index of the highlighted choice.

onPing

This event is triggered when a choice in the list is "ping-ed", i.e. either by clicking or by pressing the RETURN key. Usually this means "select", but it is up to the event handler to decide how to interpret the event. The event handler may use event.index to know the index of the ping-ed choice.

onCancel

This event is triggered when the user presses the ESCAPE key.