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/src/main/resources/org/apache/struts2/static/tabview/tabview.js

http://struts2yuiplugin.googlecode.com/
JavaScript | 980 lines | 540 code | 134 blank | 306 comment | 115 complexity | 7392b5f8f49ac84bee714de101a4b0d3 MD5 | raw file
  1/*
  2Copyright (c) 2009, Yahoo! Inc. All rights reserved.
  3Code licensed under the BSD License:
  4http://developer.yahoo.net/yui/license.txt
  5version: 2.7.0
  6*/
  7(function() {
  8
  9    /**
 10     * The tabview module provides a widget for managing content bound to tabs.
 11     * @module tabview
 12     * @requires yahoo, dom, event, element
 13     *
 14     */
 15
 16    var Y = YAHOO.util,
 17        Dom = Y.Dom,
 18        Event = Y.Event,
 19        document = window.document,
 20    
 21        // STRING CONSTANTS
 22        ACTIVE = 'active',
 23        ACTIVE_INDEX = 'activeIndex',
 24        ACTIVE_TAB = 'activeTab',
 25        CONTENT_EL = 'contentEl',
 26        ELEMENT = 'element',
 27    
 28    /**
 29     * A widget to control tabbed views.
 30     * @namespace YAHOO.widget
 31     * @class TabView
 32     * @extends YAHOO.util.Element
 33     * @constructor
 34     * @param {HTMLElement | String | Object} el(optional) The html 
 35     * element that represents the TabView, or the attribute object to use. 
 36     * An element will be created if none provided.
 37     * @param {Object} attr (optional) A key map of the tabView's 
 38     * initial attributes.  Ignored if first arg is attributes object.
 39     */
 40    TabView = function(el, attr) {
 41        attr = attr || {};
 42        if (arguments.length == 1 && !YAHOO.lang.isString(el) && !el.nodeName) {
 43            attr = el; // treat first arg as attr object
 44            el = attr.element || null;
 45        }
 46        
 47        if (!el && !attr.element) { // create if we dont have one
 48            el = this._createTabViewElement(attr);
 49        }
 50        TabView.superclass.constructor.call(this, el, attr); 
 51    };
 52
 53    YAHOO.extend(TabView, Y.Element, {
 54        /**
 55         * The className to add when building from scratch. 
 56         * @property CLASSNAME
 57         * @default "navset"
 58         */
 59        CLASSNAME: 'yui-navset',
 60        
 61        /**
 62         * The className of the HTMLElement containing the TabView's tab elements
 63         * to look for when building from existing markup, or to add when building
 64         * from scratch. 
 65         * All childNodes of the tab container are treated as Tabs when building
 66         * from existing markup.
 67         * @property TAB_PARENT_CLASSNAME
 68         * @default "nav"
 69         */
 70        TAB_PARENT_CLASSNAME: 'yui-nav',
 71        
 72        /**
 73         * The className of the HTMLElement containing the TabView's label elements
 74         * to look for when building from existing markup, or to add when building
 75         * from scratch. 
 76         * All childNodes of the content container are treated as content elements when
 77         * building from existing markup.
 78         * @property CONTENT_PARENT_CLASSNAME
 79         * @default "nav-content"
 80         */
 81        CONTENT_PARENT_CLASSNAME: 'yui-content',
 82        
 83        _tabParent: null,
 84        _contentParent: null,
 85        
 86        /**
 87         * Adds a Tab to the TabView instance.  
 88         * If no index is specified, the tab is added to the end of the tab list.
 89         * @method addTab
 90         * @param {YAHOO.widget.Tab} tab A Tab instance to add.
 91         * @param {Integer} index The position to add the tab. 
 92         * @return void
 93         */
 94        addTab: function(tab, index) {
 95            var tabs = this.get('tabs'),
 96                before = this.getTab(index),
 97                tabParent = this._tabParent,
 98                contentParent = this._contentParent,
 99                tabElement = tab.get(ELEMENT),
100                contentEl = tab.get(CONTENT_EL);
101
102            if (!tabs) { // not ready yet
103                this._queue[this._queue.length] = ['addTab', arguments];
104                return false;
105            }
106            
107            index = (index === undefined) ? tabs.length : index;
108            
109            if ( before ) {
110                tabParent.insertBefore(tabElement, before.get(ELEMENT));
111            } else {
112                tabParent.appendChild(tabElement);
113            }
114
115            if ( contentEl && !Dom.isAncestor(contentParent, contentEl) ) {
116                contentParent.appendChild(contentEl);
117            }
118            
119            if ( !tab.get(ACTIVE) ) {
120                tab.set('contentVisible', false, true); /* hide if not active */
121            } else {
122                this.set(ACTIVE_TAB, tab, true);
123                
124            }
125
126            this._initTabEvents(tab);
127            tabs.splice(index, 0, tab);
128        },
129
130        _initTabEvents: function(tab) {
131            tab.addListener( tab.get('activationEvent'), tab._onActivate, this, tab);
132            
133            tab.addListener('activationEventChange', function(e) {
134                if (e.prevValue != e.newValue) {
135                    tab.removeListener(e.prevValue, tab._onActivate);
136                    tab.addListener(e.newValue, tab._onActivate, this, tab);
137                }
138            });
139        },
140
141        /**
142         * Routes childNode events.
143         * @method DOMEventHandler
144         * @param {event} e The Dom event that is being handled.
145         * @return void
146         */
147        DOMEventHandler: function(e) {
148            var target = Event.getTarget(e),
149                tabParent = this._tabParent,
150                tabs = this.get('tabs'),
151                tab,
152                tabEl,
153                contentEl;
154
155            
156            if (Dom.isAncestor(tabParent, target) ) {
157                for (var i = 0, len = tabs.length; i < len; i++) {
158                    tabEl = tabs[i].get(ELEMENT);
159                    contentEl = tabs[i].get(CONTENT_EL);
160
161                    if ( target == tabEl || Dom.isAncestor(tabEl, target) ) {
162                        tab = tabs[i];
163                        break; // note break
164                    }
165                } 
166                
167                if (tab) {
168                    tab.fireEvent(e.type, e);
169                }
170            }
171        },
172        
173        /**
174         * Returns the Tab instance at the specified index.
175         * @method getTab
176         * @param {Integer} index The position of the Tab.
177         * @return YAHOO.widget.Tab
178         */
179        getTab: function(index) {
180            return this.get('tabs')[index];
181        },
182        
183        /**
184         * Returns the index of given tab.
185         * @method getTabIndex
186         * @param {YAHOO.widget.Tab} tab The tab whose index will be returned.
187         * @return int
188         */
189        getTabIndex: function(tab) {
190            var index = null,
191                tabs = this.get('tabs');
192            for (var i = 0, len = tabs.length; i < len; ++i) {
193                if (tab == tabs[i]) {
194                    index = i;
195                    break;
196                }
197            }
198            
199            return index;
200        },
201        
202        /**
203         * Removes the specified Tab from the TabView.
204         * @method removeTab
205         * @param {YAHOO.widget.Tab} item The Tab instance to be removed.
206         * @return void
207         */
208        removeTab: function(tab) {
209            var tabCount = this.get('tabs').length,
210                index = this.getTabIndex(tab);
211
212            if ( tab === this.get(ACTIVE_TAB) ) { 
213                if (tabCount > 1) { // select another tab
214                    if (index + 1 === tabCount) { // if last, activate previous
215                        this.set(ACTIVE_INDEX, index - 1);
216                    } else { // activate next tab
217                        this.set(ACTIVE_INDEX, index + 1);
218                    }
219                } else { // no more tabs
220                    this.set(ACTIVE_TAB, null);
221                }
222            }
223            
224            this._tabParent.removeChild( tab.get(ELEMENT) );
225            this._contentParent.removeChild( tab.get(CONTENT_EL) );
226            this._configs.tabs.value.splice(index, 1);
227
228            tab.fireEvent('remove', { type: 'remove', tabview: this });
229        },
230        
231        /**
232         * Provides a readable name for the TabView instance.
233         * @method toString
234         * @return String
235         */
236        toString: function() {
237            var name = this.get('id') || this.get('tagName');
238            return "TabView " + name; 
239        },
240        
241        /**
242         * The transiton to use when switching between tabs.
243         * @method contentTransition
244         */
245        contentTransition: function(newTab, oldTab) {
246            if (newTab) {
247                newTab.set('contentVisible', true);
248            }
249            if (oldTab) {
250                oldTab.set('contentVisible', false);
251            }
252        },
253        
254        /**
255         * setAttributeConfigs TabView specific properties.
256         * @method initAttributes
257         * @param {Object} attr Hash of initial attributes
258         */
259        initAttributes: function(attr) {
260            TabView.superclass.initAttributes.call(this, attr);
261            
262            if (!attr.orientation) {
263                attr.orientation = 'top';
264            }
265            
266            var el = this.get(ELEMENT);
267
268            if (!Dom.hasClass(el, this.CLASSNAME)) {
269                Dom.addClass(el, this.CLASSNAME);        
270            }
271            
272            /**
273             * The Tabs belonging to the TabView instance.
274             * @attribute tabs
275             * @type Array
276             */
277            this.setAttributeConfig('tabs', {
278                value: [],
279                readOnly: true
280            });
281
282            /**
283             * The container of the tabView's label elements.
284             * @property _tabParent
285             * @private
286             * @type HTMLElement
287             */
288            this._tabParent = 
289                    this.getElementsByClassName(this.TAB_PARENT_CLASSNAME,
290                            'ul' )[0] || this._createTabParent();
291                
292            /**
293             * The container of the tabView's content elements.
294             * @property _contentParent
295             * @type HTMLElement
296             * @private
297             */
298            this._contentParent = 
299                    this.getElementsByClassName(this.CONTENT_PARENT_CLASSNAME,
300                            'div')[0] ||  this._createContentParent();
301            
302            /**
303             * How the Tabs should be oriented relative to the TabView.
304             * @attribute orientation
305             * @type String
306             * @default "top"
307             */
308            this.setAttributeConfig('orientation', {
309                value: attr.orientation,
310                method: function(value) {
311                    var current = this.get('orientation');
312                    this.addClass('yui-navset-' + value);
313                    
314                    if (current != value) {
315                        this.removeClass('yui-navset-' + current);
316                    }
317                    
318                    if (value === 'bottom') {
319                        this.appendChild(this._tabParent);
320                    }
321                }
322            });
323            
324            /**
325             * The index of the tab currently active.
326             * @attribute activeIndex
327             * @type Int
328             */
329            this.setAttributeConfig(ACTIVE_INDEX, {
330                value: attr.activeIndex,
331                method: function(value) {
332                },
333                validator: function(value) {
334                    var ret = true;
335                    if (value && this.getTab(value).get('disabled')) { // cannot activate if disabled
336                        ret = false;
337                    }
338                    return ret;
339                }
340            });
341            
342            /**
343             * The tab currently active.
344             * @attribute activeTab
345             * @type YAHOO.widget.Tab
346             */
347            this.setAttributeConfig(ACTIVE_TAB, {
348                value: attr.activeTab,
349                method: function(tab) {
350                    var activeTab = this.get(ACTIVE_TAB);
351                    
352                    if (tab) {
353                        tab.set(ACTIVE, true);
354                    }
355                    
356                    if (activeTab && activeTab !== tab) {
357                        activeTab.set(ACTIVE, false);
358                    }
359                    
360                    if (activeTab && tab !== activeTab) { // no transition if only 1
361                        this.contentTransition(tab, activeTab);
362                    } else if (tab) {
363                        tab.set('contentVisible', true);
364                    }
365                },
366                validator: function(value) {
367                    var ret = true;
368                    if (value && value.get('disabled')) { // cannot activate if disabled
369                        ret = false;
370                    }
371                    return ret;
372                }
373            });
374
375            this.on('activeTabChange', this._onActiveTabChange);
376            this.on('activeIndexChange', this._onActiveIndexChange);
377
378            if ( this._tabParent ) {
379                this._initTabs();
380            }
381            
382            // Due to delegation we add all DOM_EVENTS to the TabView container
383            // but IE will leak when unsupported events are added, so remove these
384            this.DOM_EVENTS.submit = false;
385            this.DOM_EVENTS.focus = false;
386            this.DOM_EVENTS.blur = false;
387
388            for (var type in this.DOM_EVENTS) {
389                if ( YAHOO.lang.hasOwnProperty(this.DOM_EVENTS, type) ) {
390                    this.addListener.call(this, type, this.DOMEventHandler);
391                }
392            }
393        },
394
395        /**
396         * Removes selected state from the given tab if it is the activeTab
397         * @method deselectTab
398         * @param {Int} index The tab index to deselect 
399         */
400        deselectTab: function(index) {
401            if (this.getTab(index) === this.get('activeTab')) {
402                this.set('activeTab', null);
403            }
404        },
405
406        /**
407         * Makes the tab at the given index the active tab
408         * @method selectTab
409         * @param {Int} index The tab index to be made active
410         */
411        selectTab: function(index) {
412            this.set('activeTab', this.getTab(index));
413        },
414
415        _onActiveTabChange: function(e) {
416            var activeIndex = this.get(ACTIVE_INDEX),
417                newIndex = this.getTabIndex(e.newValue);
418
419            if (activeIndex !== newIndex) {
420                if (!(this.set(ACTIVE_INDEX, newIndex)) ) { // NOTE: setting
421                     // revert if activeIndex update fails (cancelled via beforeChange) 
422                    this.set(ACTIVE_TAB, e.prevValue);
423                }
424            }
425        },
426        
427        _onActiveIndexChange: function(e) {
428            // no set if called from ActiveTabChange event
429            if (e.newValue !== this.getTabIndex(this.get(ACTIVE_TAB))) {
430                if (!(this.set(ACTIVE_TAB, this.getTab(e.newValue))) ) { // NOTE: setting
431                     // revert if activeTab update fails (cancelled via beforeChange) 
432                    this.set(ACTIVE_INDEX, e.prevValue);
433                }
434            }
435        },
436
437        /**
438         * Creates Tab instances from a collection of HTMLElements.
439         * @method _initTabs
440         * @private
441         * @return void
442         */
443        _initTabs: function() {
444            var tabs = Dom.getChildren(this._tabParent),
445                contentElements = Dom.getChildren(this._contentParent),
446                activeIndex = this.get(ACTIVE_INDEX),
447                tab,
448                attr,
449                active;
450
451            for (var i = 0, len = tabs.length; i < len; ++i) {
452                attr = {};
453                
454                if (contentElements[i]) {
455                    attr.contentEl = contentElements[i];
456                }
457
458                tab = new YAHOO.widget.Tab(tabs[i], attr);
459                this.addTab(tab);
460                
461                if (tab.hasClass(tab.ACTIVE_CLASSNAME) ) {
462                    active = tab;
463                }
464            }
465            if (activeIndex) {
466                this.set(ACTIVE_TAB, this.getTab(activeIndex));
467            } else {
468                this._configs.activeTab.value = active; // dont invoke method
469                this._configs.activeIndex.value = this.getTabIndex(active);
470            }
471        },
472
473        _createTabViewElement: function(attr) {
474            var el = document.createElement('div');
475
476            if ( this.CLASSNAME ) {
477                el.className = this.CLASSNAME;
478            }
479            
480            return el;
481        },
482
483        _createTabParent: function(attr) {
484            var el = document.createElement('ul');
485
486            if ( this.TAB_PARENT_CLASSNAME ) {
487                el.className = this.TAB_PARENT_CLASSNAME;
488            }
489            
490            this.get(ELEMENT).appendChild(el);
491            
492            return el;
493        },
494        
495        _createContentParent: function(attr) {
496            var el = document.createElement('div');
497
498            if ( this.CONTENT_PARENT_CLASSNAME ) {
499                el.className = this.CONTENT_PARENT_CLASSNAME;
500            }
501            
502            this.get(ELEMENT).appendChild(el);
503            
504            return el;
505        }
506    });
507    
508    
509    YAHOO.widget.TabView = TabView;
510})();
511
512(function() {
513    var Y = YAHOO.util, 
514        Dom = Y.Dom,
515        Lang = YAHOO.lang,
516    
517
518    // STRING CONSTANTS
519        ACTIVE_TAB = 'activeTab',
520        LABEL = 'label',
521        LABEL_EL = 'labelEl',
522        CONTENT = 'content',
523        CONTENT_EL = 'contentEl',
524        ELEMENT = 'element',
525        CACHE_DATA = 'cacheData',
526        DATA_SRC = 'dataSrc',
527        DATA_LOADED = 'dataLoaded',
528        DATA_TIMEOUT = 'dataTimeout',
529        LOAD_METHOD = 'loadMethod',
530        POST_DATA = 'postData',
531        DISABLED = 'disabled',
532    
533    /**
534     * A representation of a Tab's label and content.
535     * @namespace YAHOO.widget
536     * @class Tab
537     * @extends YAHOO.util.Element
538     * @constructor
539     * @param element {HTMLElement | String} (optional) The html element that 
540     * represents the TabView. An element will be created if none provided.
541     * @param {Object} properties A key map of initial properties
542     */
543    Tab = function(el, attr) {
544        attr = attr || {};
545        if (arguments.length == 1 && !Lang.isString(el) && !el.nodeName) {
546            attr = el;
547            el = attr.element;
548        }
549
550        if (!el && !attr.element) {
551            el = this._createTabElement(attr);
552        }
553
554        this.loadHandler =  {
555            success: function(o) {
556                this.set(CONTENT, o.responseText);
557            },
558            failure: function(o) {
559            }
560        };
561        
562        Tab.superclass.constructor.call(this, el, attr);
563        
564        this.DOM_EVENTS = {}; // delegating to tabView
565    };
566
567    YAHOO.extend(Tab, YAHOO.util.Element, {
568        /**
569         * The default tag name for a Tab's inner element.
570         * @property LABEL_INNER_TAGNAME
571         * @type String
572         * @default "em"
573         */
574        LABEL_TAGNAME: 'em',
575        
576        /**
577         * The class name applied to active tabs.
578         * @property ACTIVE_CLASSNAME
579         * @type String
580         * @default "selected"
581         */
582        ACTIVE_CLASSNAME: 'selected',
583        
584        /**
585         * The class name applied to active tabs.
586         * @property ACTIVE_CLASSNAME
587         * @type String
588         * @default "selected"
589         */
590        HIDDEN_CLASSNAME: 'yui-hidden',
591        
592        /**
593         * The title applied to active tabs.
594         * @property ACTIVE_TITLE
595         * @type String
596         * @default "active"
597         */
598        ACTIVE_TITLE: 'active',
599
600        /**
601         * The class name applied to disabled tabs.
602         * @property DISABLED_CLASSNAME
603         * @type String
604         * @default "disabled"
605         */
606        DISABLED_CLASSNAME: DISABLED,
607        
608        /**
609         * The class name applied to dynamic tabs while loading.
610         * @property LOADING_CLASSNAME
611         * @type String
612         * @default "disabled"
613         */
614        LOADING_CLASSNAME: 'loading',
615
616        /**
617         * Provides a reference to the connection request object when data is
618         * loaded dynamically.
619         * @property dataConnection
620         * @type Object
621         */
622        dataConnection: null,
623        
624        /**
625         * Object containing success and failure callbacks for loading data.
626         * @property loadHandler
627         * @type object
628         */
629        loadHandler: null,
630
631        _loading: false,
632        
633        /**
634         * Provides a readable name for the tab.
635         * @method toString
636         * @return String
637         */
638        toString: function() {
639            var el = this.get(ELEMENT),
640                id = el.id || el.tagName;
641            return "Tab " + id; 
642        },
643        
644        /**
645         * setAttributeConfigs TabView specific properties.
646         * @method initAttributes
647         * @param {Object} attr Hash of initial attributes
648         */
649        initAttributes: function(attr) {
650            attr = attr || {};
651            Tab.superclass.initAttributes.call(this, attr);
652            
653            /**
654             * The event that triggers the tab's activation.
655             * @attribute activationEvent
656             * @type String
657             */
658            this.setAttributeConfig('activationEvent', {
659                value: attr.activationEvent || 'click'
660            });        
661
662            /**
663             * The element that contains the tab's label.
664             * @attribute labelEl
665             * @type HTMLElement
666             */
667            this.setAttributeConfig(LABEL_EL, {
668                value: attr[LABEL_EL] || this._getLabelEl(),
669                method: function(value) {
670                    value = Dom.get(value);
671                    var current = this.get(LABEL_EL);
672
673                    if (current) {
674                        if (current == value) {
675                            return false; // already set
676                        }
677                        
678                        current.parentNode.replaceChild(value, current);
679                        this.set(LABEL, value.innerHTML);
680                    }
681                } 
682            });
683
684            /**
685             * The tab's label text (or innerHTML).
686             * @attribute label
687             * @type String
688             */
689            this.setAttributeConfig(LABEL, {
690                value: attr.label || this._getLabel(),
691                method: function(value) {
692                    var labelEl = this.get(LABEL_EL);
693                    if (!labelEl) { // create if needed
694                        this.set(LABEL_EL, this._createLabelEl());
695                    }
696                    
697                    labelEl.innerHTML = value;
698                }
699            });
700            
701            /**
702             * The HTMLElement that contains the tab's content.
703             * @attribute contentEl
704             * @type HTMLElement
705             */
706            this.setAttributeConfig(CONTENT_EL, {
707                value: attr[CONTENT_EL] || document.createElement('div'),
708                method: function(value) {
709                    value = Dom.get(value);
710                    var current = this.get(CONTENT_EL);
711
712                    if (current) {
713                        if (current === value) {
714                            return false; // already set
715                        }
716                        if (!this.get('selected')) {
717                            Dom.addClass(value, 'yui-hidden');
718                        }
719                        current.parentNode.replaceChild(value, current);
720                        this.set(CONTENT, value.innerHTML);
721                    }
722                }
723            });
724            
725            /**
726             * The tab's content.
727             * @attribute content
728             * @type String
729             */
730            this.setAttributeConfig(CONTENT, {
731                value: attr[CONTENT],
732                method: function(value) {
733                    this.get(CONTENT_EL).innerHTML = value;
734                }
735            });
736
737            /**
738             * The tab's data source, used for loading content dynamically.
739             * @attribute dataSrc
740             * @type String
741             */
742            this.setAttributeConfig(DATA_SRC, {
743                value: attr.dataSrc
744            });
745            
746            /**
747             * Whether or not content should be reloaded for every view.
748             * @attribute cacheData
749             * @type Boolean
750             * @default false
751             */
752            this.setAttributeConfig(CACHE_DATA, {
753                value: attr.cacheData || false,
754                validator: Lang.isBoolean
755            });
756            
757            /**
758             * The method to use for the data request.
759             * @attribute loadMethod
760             * @type String
761             * @default "GET"
762             */
763            this.setAttributeConfig(LOAD_METHOD, {
764                value: attr.loadMethod || 'GET',
765                validator: Lang.isString
766            });
767
768            /**
769             * Whether or not any data has been loaded from the server.
770             * @attribute dataLoaded
771             * @type Boolean
772             */        
773            this.setAttributeConfig(DATA_LOADED, {
774                value: false,
775                validator: Lang.isBoolean,
776                writeOnce: true
777            });
778            
779            /**
780             * Number if milliseconds before aborting and calling failure handler.
781             * @attribute dataTimeout
782             * @type Number
783             * @default null
784             */
785            this.setAttributeConfig(DATA_TIMEOUT, {
786                value: attr.dataTimeout || null,
787                validator: Lang.isNumber
788            });
789            
790            /**
791             * Arguments to pass when POST method is used 
792             * @attribute postData
793             * @default null
794             */
795            this.setAttributeConfig(POST_DATA, {
796                value: attr.postData || null
797            });
798
799            /**
800             * Whether or not the tab is currently active.
801             * If a dataSrc is set for the tab, the content will be loaded from
802             * the given source.
803             * @attribute active
804             * @type Boolean
805             */
806            this.setAttributeConfig('active', {
807                value: attr.active || this.hasClass(this.ACTIVE_CLASSNAME),
808                method: function(value) {
809                    if (value === true) {
810                        this.addClass(this.ACTIVE_CLASSNAME);
811                        this.set('title', this.ACTIVE_TITLE);
812                    } else {
813                        this.removeClass(this.ACTIVE_CLASSNAME);
814                        this.set('title', '');
815                    }
816                },
817                validator: function(value) {
818                    return Lang.isBoolean(value) && !this.get(DISABLED) ;
819                }
820            });
821            
822            /**
823             * Whether or not the tab is disabled.
824             * @attribute disabled
825             * @type Boolean
826             */
827            this.setAttributeConfig(DISABLED, {
828                value: attr.disabled || this.hasClass(this.DISABLED_CLASSNAME),
829                method: function(value) {
830                    if (value === true) {
831                        Dom.addClass(this.get(ELEMENT), this.DISABLED_CLASSNAME);
832                    } else {
833                        Dom.removeClass(this.get(ELEMENT), this.DISABLED_CLASSNAME);
834                    }
835                },
836                validator: Lang.isBoolean
837            });
838            
839            /**
840             * The href of the tab's anchor element.
841             * @attribute href
842             * @type String
843             * @default '#'
844             */
845            this.setAttributeConfig('href', {
846                value: attr.href ||
847                        this.getElementsByTagName('a')[0].getAttribute('href', 2) || '#',
848                method: function(value) {
849                    this.getElementsByTagName('a')[0].href = value;
850                },
851                validator: Lang.isString
852            });
853            
854            /**
855             * The Whether or not the tab's content is visible.
856             * @attribute contentVisible
857             * @type Boolean
858             * @default false
859             */
860            this.setAttributeConfig('contentVisible', {
861                value: attr.contentVisible,
862                method: function(value) {
863                    if (value) {
864                        Dom.removeClass(this.get(CONTENT_EL), this.HIDDEN_CLASSNAME);
865                        
866                        if ( this.get(DATA_SRC) ) {
867                         // load dynamic content unless already loading or loaded and caching
868                            if ( !this._loading && !(this.get(DATA_LOADED) && this.get(CACHE_DATA)) ) {
869                                this._dataConnect();
870                            }
871                        }
872                    } else {
873                        Dom.addClass(this.get(CONTENT_EL), this.HIDDEN_CLASSNAME);
874                    }
875                },
876                validator: Lang.isBoolean
877            });
878        },
879        
880        _dataConnect: function() {
881            if (!Y.Connect) {
882                return false;
883            }
884
885            Dom.addClass(this.get(CONTENT_EL).parentNode, this.LOADING_CLASSNAME);
886            this._loading = true; 
887            this.dataConnection = Y.Connect.asyncRequest(
888                this.get(LOAD_METHOD),
889                this.get(DATA_SRC), 
890                {
891                    success: function(o) {
892                        this.loadHandler.success.call(this, o);
893                        this.set(DATA_LOADED, true);
894                        this.dataConnection = null;
895                        Dom.removeClass(this.get(CONTENT_EL).parentNode,
896                                this.LOADING_CLASSNAME);
897                        this._loading = false;
898                    },
899                    failure: function(o) {
900                        this.loadHandler.failure.call(this, o);
901                        this.dataConnection = null;
902                        Dom.removeClass(this.get(CONTENT_EL).parentNode,
903                                this.LOADING_CLASSNAME);
904                        this._loading = false;
905                    },
906                    scope: this,
907                    timeout: this.get(DATA_TIMEOUT)
908                },
909
910                this.get(POST_DATA)
911            );
912        },
913        _createTabElement: function(attr) {
914            var el = document.createElement('li'),
915                a = document.createElement('a'),
916                label = attr.label || null,
917                labelEl = attr.labelEl || null;
918            
919            a.href = attr.href || '#'; // TODO: Use Dom.setAttribute?
920            el.appendChild(a);
921            
922            if (labelEl) { // user supplied labelEl
923                if (!label) { // user supplied label
924                    label = this._getLabel();
925                }
926            } else {
927                labelEl = this._createLabelEl();
928            }
929            
930            a.appendChild(labelEl);
931            
932            return el;
933        },
934
935        _getLabelEl: function() {
936            return this.getElementsByTagName(this.LABEL_TAGNAME)[0];
937        },
938
939        _createLabelEl: function() {
940            var el = document.createElement(this.LABEL_TAGNAME);
941            return el;
942        },
943    
944        
945        _getLabel: function() {
946            var el = this.get(LABEL_EL);
947                
948                if (!el) {
949                    return undefined;
950                }
951            
952            return el.innerHTML;
953        },
954
955        _onActivate: function(e, tabview) {
956            var tab = this,
957                silent = false;
958            
959
960            Y.Event.preventDefault(e);
961            if (tab === tabview.get(ACTIVE_TAB)) {
962                silent = true; // dont fire activeTabChange if already active
963            }
964            tabview.set(ACTIVE_TAB, tab, silent);
965        }
966    });
967    
968    
969    /**
970     * Fires when a tab is removed from the tabview
971     * @event remove
972     * @type CustomEvent
973     * @param {Event} An event object with fields for "type" ("remove")
974     * and "tabview" (the tabview instance it was removed from) 
975     */
976    
977    YAHOO.widget.Tab = Tab;
978})();
979
980YAHOO.register("tabview", YAHOO.widget.TabView, {version: "2.7.0", build: "1799"});