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✏️ Editing: autocomplete-list-keys.js

YUI.add('autocomplete-list-keys', function (Y, NAME) {

/**
Mixes keyboard support into AutoCompleteList. By default, this module is not
loaded for iOS and Android devices.

@module autocomplete
@submodule autocomplete-list-keys
**/

// keyCode constants.
var KEY_DOWN  = 40,
    KEY_ENTER = 13,
    KEY_ESC   = 27,
    KEY_TAB   = 9,
    KEY_UP    = 38;

function ListKeys() {
    Y.after(this._bindKeys, this, 'bindUI');
    this._initKeys();
}

ListKeys.prototype = {
    // -- Lifecycle Methods ----------------------------------------------------

/**
    Initializes keyboard command mappings.

@method _initKeys
    @protected
    @for AutoCompleteList
    **/
    _initKeys: function () {
        var keys        = {},
            keysVisible = {};

// Register keyboard command handlers. _keys contains handlers that will
        // always be called; _keysVisible contains handlers that will only be
        // called when the list is visible.
        keys[KEY_DOWN] = this._keyDown;

keysVisible[KEY_ENTER] = this._keyEnter;
        keysVisible[KEY_ESC]   = this._keyEsc;
        keysVisible[KEY_TAB]   = this._keyTab;
        keysVisible[KEY_UP]    = this._keyUp;

this._keys        = keys;
        this._keysVisible = keysVisible;
    },

destructor: function () {
        this._unbindKeys();
    },

/**
    Binds keyboard events.

@method _bindKeys
    @protected
    **/
    _bindKeys: function () {
        this._keyEvents = this._inputNode.on('keydown', this._onInputKey, this);
    },

/**
    Unbinds keyboard events.

@method _unbindKeys
    @protected
    **/
    _unbindKeys: function () {
        this._keyEvents && this._keyEvents.detach();
        this._keyEvents = null;
    },

// -- Protected Methods ----------------------------------------------------

/**
    Called when the down arrow key is pressed.

@method _keyDown
    @protected
    **/
    _keyDown: function () {
        if (this.get('visible')) {
            this._activateNextItem();
        } else {
            this.show();
        }
    },

/**
    Called when the enter key is pressed.

@method _keyEnter
    @protected
    **/
    _keyEnter: function (e) {
        var item = this.get('activeItem');

if (item) {
            this.selectItem(item, e);
        } else {
            // Don't prevent form submission when there's no active item.
            return false;
        }
    },

/**
    Called when the escape key is pressed.

@method _keyEsc
    @protected
    **/
    _keyEsc: function () {
        this.hide();
    },

/**
    Called when the tab key is pressed.

@method _keyTab
    @protected
    **/
    _keyTab: function (e) {
        var item;

if (this.get('tabSelect')) {
            item = this.get('activeItem');

if (item) {
                this.selectItem(item, e);
                return true;
            }
        }

return false;
    },

/**
    Called when the up arrow key is pressed.

@method _keyUp
    @protected
    **/
    _keyUp: function () {
        this._activatePrevItem();
    },

// -- Protected Event Handlers ---------------------------------------------

/**
    Handles `inputNode` key events.

@method _onInputKey
    @param {EventTarget} e
    @protected
    **/
    _onInputKey: function (e) {
        var handler,
            keyCode = e.keyCode;

this._lastInputKey = keyCode;

if (this.get('results').length) {
            handler = this._keys[keyCode];

if (!handler && this.get('visible')) {
                handler = this._keysVisible[keyCode];
            }

if (handler) {
                // A handler may return false to indicate that it doesn't wish
                // to prevent the default key behavior.
                if (handler.call(this, e) !== false) {
                    e.preventDefault();
                }
            }
        }
    }
};

Y.Base.mix(Y.AutoCompleteList, [ListKeys]);

}, '3.18.1', {"requires": ["autocomplete-list", "base-build"]});

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