# Yahoo! UI Library

### tabview 3.3.0

Yahoo! UI Library > tabview > tabview.js (source view)
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    /**
     * The TabView module
     *
     * @module tabview
     */

    var _queries = Y.TabviewBase._queries,
        _classNames = Y.TabviewBase._classNames,
        DOT = '.',
        getClassName = Y.ClassNameManager.getClassName,

        /**
         * Provides a tabbed widget interface
         * @param config {Object} Object literal specifying tabview configuration properties.
         *
         * @class TabView
         * @constructor
         * @extends Widget
         * @uses WidgetParent
         */
        TabView = Y.Base.create('tabView', Y.Widget, [Y.WidgetParent], {
        _afterChildAdded: function(e) {
            this.get('contentBox').focusManager.refresh();
        },

        _defListNodeValueFn: function() {
            return Y.Node.create(TabView.LIST_TEMPLATE);
        },

        _defPanelNodeValueFn: function() {
            return Y.Node.create(TabView.PANEL_TEMPLATE);
        },

        _afterChildRemoved: function(e) { // update the selected tab when removed
            var i = e.index,
                selection = this.get('selection');

            if (!selection) { // select previous item if selection removed
                selection = this.item(i - 1) || this.item(0);
                if (selection) {
                    selection.set('selected', 1);
                }
            }

            this.get('contentBox').focusManager.refresh();
        },

        _initAria: function() {
            var contentBox = this.get('contentBox'),
                tablist = contentBox.one(_queries.tabviewList);

            if (tablist) {
                tablist.setAttrs({
                    //'aria-labelledby':
                    role: 'tablist'
                });
            }
        },

        bindUI: function() {
            //  Use the Node Focus Manager to add keyboard support:
            //  Pressing the left and right arrow keys will move focus
            //  among each of the tabs.

            this.get('contentBox').plug(Y.Plugin.NodeFocusManager, {
                            descendants: DOT + _classNames.tabLabel,
                            keys: { next: 'down:39', // Right arrow
                                    previous: 'down:37' },  // Left arrow
                            circular: true
                        });

            this.after('render', this._setDefSelection);
            this.after('addChild', this._afterChildAdded);
            this.after('removeChild', this._afterChildRemoved);
        },

        renderUI: function() {
            var contentBox = this.get('contentBox');
            this._renderListBox(contentBox);
            this._renderPanelBox(contentBox);
            this._childrenContainer = this.get('listNode');
            this._renderTabs(contentBox);
        },

        _setDefSelection: function(contentBox) {
            //  If no tab is selected, select the first tab.
            var selection = this.get('selection') || this.item(0);

            this.some(function(tab) {
                if (tab.get('selected')) {
                    selection = tab;
                    return true;
                }
            });
            if (selection) {
                // TODO: why both needed? (via widgetParent/Child)?
                this.set('selection', selection);
                selection.set('selected', 1);
            }
        },

        _renderListBox: function(contentBox) {
            var node = this.get('listNode');
            if (!node.inDoc()) {
                contentBox.append(node);
            }
        },

        _renderPanelBox: function(contentBox) {
            var node = this.get('panelNode');
            if (!node.inDoc()) {
                contentBox.append(node);
            }
        },

        _renderTabs: function(contentBox) {
            var tabs = contentBox.all(_queries.tab),
                panelNode = this.get('panelNode'),
                panels = (panelNode) ? this.get('panelNode').get('children') : null,
                tabview = this;

            if (tabs) { // add classNames and fill in Tab fields from markup when possible
                tabs.addClass(_classNames.tab);
                contentBox.all(_queries.tabLabel).addClass(_classNames.tabLabel);
                contentBox.all(_queries.tabPanel).addClass(_classNames.tabPanel);

                tabs.each(function(node, i) {
                    var panelNode = (panels) ? panels.item(i) : null;
                    tabview.add({
                        boundingBox: node,
                        contentBox: node.one(DOT + _classNames.tabLabel),
                        label: node.one(DOT + _classNames.tabLabel).get('text'),
                        panelNode: panelNode
                    });
                });
            }
        }
    }, {

        LIST_TEMPLATE: '<ul class="' + _classNames.tabviewList + '"></ul>',
        PANEL_TEMPLATE: '<div class="' + _classNames.tabviewPanel + '"></div>',

        ATTRS: {
            defaultChildType: {
                value: 'Tab'
            },

            listNode: {
                setter: function(node) {
                    node = Y.one(node);
                    if (node) {
                        node.addClass(_classNames.tabviewList);
                    }
                    return node;
                },

                valueFn: '_defListNodeValueFn'
            },

            panelNode: {
                setter: function(node) {
                    node = Y.one(node);
                    if (node) {
                        node.addClass(_classNames.tabviewPanel);
                    }
                    return node;
                },

                valueFn: '_defPanelNodeValueFn'
            },

            tabIndex: {
                value: null
                //validator: '_validTabIndex'
            }
        },

        HTML_PARSER: {
            listNode: _queries.tabviewList,
            panelNode: _queries.tabviewPanel
        }
    });

    Y.TabView = TabView;

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