1 /*!   2  * jQuery UI Widget 1.8.1   3  *   4  * Copyright (c) 2010 AUTHORS.txt (http://jqueryui.com/about)   5  * Dual licensed under the MIT (MIT-LICENSE.txt)   6  * and GPL (GPL-LICENSE.txt) licenses.   7  *   8  * http://docs.jquery.com/UI/Widget   9  */   10 (function( $ ) {   11     12 var _remove = $.fn.remove;   13     14 $.fn.remove = function( selector, keepData ) {   15     return this.each(function() {   16         if ( !keepData ) {   17             if ( !selector || $.filter( selector, [ this ] ).length ) {   18                 $( "*", this ).add( this ).each(function() {   19                     $( this ).triggerHandler( "remove" );   20                 });   21             }   22         }   23         //dom元素在被删除前，触发一下remove事件，jquery框架本身没有对元素删除绑定事件   24         return _remove.call( $(this), selector, keepData );   25     });   26 };   27     28 $.widget = function( name, base, prototype ) {   29     var namespace = name.split( "." )[ 0 ],   30         fullName;   31     name = name.split( "." )[ 1 ];   32     fullName = namespace + "-" + name;   33     //比如ui.tab,上面的name=‘tab‘;fullName=‘ui-tab‘;   34     35     if ( !prototype ) {   36         prototype = base;   37         base = $.Widget;   38     }   39     //如果没有prototype,那么prototype就是base参数,实际base默认为$.Widget   40     41     // create selector for plugin   42     $.expr[ ":" ][ fullName ] = function( elem ) {   43         return !!$.data( elem, name );   44     };   45     46     $[ namespace ] = $[ namespace ] || {};//是否有命名空间   47     $[ namespace ][ name ] = function( options, element ) {//根据上面的例子，即初始化了$.ui.tab=func   48         // allow instantiation without initializing for simple inheritance   49         if ( arguments.length ) {   50             this._createWidget( options, element );   51         }   52     };   53     54     var basePrototype = new base();//初始化，一般都是调用了new $.Widget()   55     // we need to make the options hash a property directly on the new instance   56     // otherwise we‘ll modify the options hash on the prototype that we‘re   57     // inheriting from   58 //  $.each( basePrototype, function( key, val ) {   59 //      if ( $.isPlainObject(val) ) {   60 //          basePrototype[ key ] = $.extend( {}, val );   61 //      }   62 //  });   63     basePrototype.options = $.extend( {}, basePrototype.options );//初始化options值，注意不需要深度拷贝   64     $[ namespace ][ name ].prototype = $.extend( true, basePrototype, {   65         namespace: namespace,   66         widgetName: name,   67         widgetEventPrefix: $[ namespace ][ name ].prototype.widgetEventPrefix || name,   68         widgetBaseClass: fullName   69     }, prototype );   70     //为新的ui模块创建原型，使用深度拷贝，在basePrototype上扩展一些模块基本信息，在扩展prototype,比如ui.tabs.js中就是tab的拥有各种方法的大对象   71     72     $.widget.bridge( name, $[ namespace ][ name ] );//将此方法挂在jQuery对象上   73 };   74     75 $.widget.bridge = function( name, object ) {   76     $.fn[ name ] = function( options ) {   77         var isMethodCall = typeof options === "string",   78             args = Array.prototype.slice.call( arguments, 1 ),   79             returnValue = http://www.mamicode.com/this;   80         //如果第一个参数是string类型，就认为是调用模块方法   81         //剩下的参数作为方法的参数，后面会用到   82     83         // allow multiple hashes to be passed on init   84         options = !isMethodCall && args.length ?   85             $.extend.apply( null, [ true, options ].concat(args) ) :   86             options;   87         //可以简单认为是$.extend(true,options,args[0],...),args可以是一个参数或是数组   88     89         // prevent calls to internal methods   90         if ( isMethodCall && options.substring( 0, 1 ) === "_" ) {   91             return returnValue;   92         }   93         //开头带下划线的方法都是私有方法，不让调用   94     95         if ( isMethodCall ) {//如果是调用函数   96             this.each(function() {   97                 var instance = $.data( this, name ),//得到实例，实例作为一个数据和元素关联上   98                     methodValue = http://www.mamicode.com/instance && $.isFunction( instance[options] ) ?  "color: #008080;"> 99                         instance[ options ].apply( instance, args ) ://如果实例和方法均存在，调用方法，把args作为参数传进去  100                         instance;//否则返回undefined  101                 if ( methodValue !== instance && methodValue !== undefined ) {//如果methodValue不是jquery对象也不是undefined  102                     returnValue =http://www.mamicode.com/ methodValue;  103                     return false;//跳出each，一般获取options的值会走这个分支  104                 }  105             });  106         } else {//不是函数调用的话  107             this.each(function() {  108                 var instance = $.data( this, name );  109                 if ( instance ) {//实例存在  110                     if ( options ) {//有参数  111                         instance.option( options );//调用option函数，一般是设置状态之类的操作  112                     }  113                     instance._init();//再次调用此函数，根据options调整  114                 } else {  115                     $.data( this, name, new object( options, this ) );  116                     //没有实例的话，给元素绑定一个实例。注意这里的this是dom，object是模块类  117                 }  118             });  119         }  120    121         return returnValue;//返回，有可能是jquery对象，有可能是其他值  122     };  123 };  124    125 $.Widget = function( options, element ) {//所有模块的基类  126     // allow instantiation without initializing for simple inheritance  127     if ( arguments.length ) {//如果有参数，调用初始化函数  128         this._createWidget( options, element );  129     }  130 };  131    132 $.Widget.prototype = {  133     widgetName: "widget",  134     widgetEventPrefix: "",  135     options: {  136         disabled: false  137     },//上面的属性会在创建模块时被覆盖  138     _createWidget: function( options, element ) {  139         // $.widget.bridge stores the plugin instance, but we do it anyway  140         // so that it‘s stored even before the _create function runs  141         this.element = $( element ).data( this.widgetName, this );//缓存实例，保存jquery对象  142         this.options = $.extend( true, {},  143             this.options,  144             $.metadata && $.metadata.get( element )[ this.widgetName ],  145             options );//参数处理  146    147         var self = this;  148         this.element.bind( "remove." + this.widgetName, function() {  149             self.destroy();  150         });//注册销毁事件  151    152         this._create();//创建  153         this._init();//初始化  154     },  155     _create: function() {},  156     _init: function() {},  157    158     destroy: function() {//销毁模块：去除绑定事件、去除数据、去除样式、属性  159         this.element  160             .unbind( "." + this.widgetName )  161             .removeData( this.widgetName );  162         this.widget()  163             .unbind( "." + this.widgetName )  164             .removeAttr( "aria-disabled" )  165             .removeClass(  166                 this.widgetBaseClass + "-disabled " +  167                 "ui-state-disabled" );  168     },  169    170     widget: function() {//返回jquery对象  171         return this.element;  172     },  173    174     option: function( key, value ) {//设置选项函数  175         var options = key,  176             self = this;  177    178         if ( arguments.length === 0 ) {  179             // don‘t return a reference to the internal hash  180             return $.extend( {}, self.options );//返回一个新的对象，不是内部数据的引用  181         }  182    183         if  (typeof key === "string" ) {  184             if ( value =http://www.mamicode.com/== undefined ) {  185                 return this.options[ key ];//取值  186             }  187             options = {};  188             options[ key ] = value;//设置值  189         }  190    191         $.each( options, function( key, value ) {  192             self._setOption( key, value );//调用内部的_setOption  193         });  194    195         return self;  196     },  197     _setOption: function( key, value ) {  198         this.options[ key ] = value;  199    200         if ( key === "disabled" ) {//增加或是去除className  201             this.widget()  202                 [ value ? "addClass" : "removeClass"](  203                     this.widgetBaseClass + "-disabled" + " " +  204                     "ui-state-disabled" )  205                 .attr( "aria-disabled", value );  206         }  207    208         return this;  209     },  210    211     enable: function() {  212         return this._setOption( "disabled", false );  213     },  214     disable: function() {  215         return this._setOption( "disabled", true );  216     },  217    218     _trigger: function( type, event, data ) {  219         var callback = this.options[ type ];  220    221         event = $.Event( event );  222         event.type = ( type === this.widgetEventPrefix ?  223             type :  224             this.widgetEventPrefix + type ).toLowerCase();  225         data = http://www.mamicode.com/data || {};  226    227         // copy original event properties over to the new event  228         // this would happen if we could call $.event.fix instead of $.Event  229         // but we don‘t have a way to force an event to be fixed multiple times  230         if ( event.originalEvent ) {//把原始的event属性重新赋到event变量上  231             for ( var i = $.event.props.length, prop; i; ) {  232                 prop = $.event.props[ --i ];  233                 event[ prop ] = event.originalEvent[ prop ];  234             }  235         }  236    237         this.element.trigger( event, data );  238    239         return !( $.isFunction(callback) &&  240             callback.call( this.element[0], event, data ) === false ||  241             event.isDefaultPrevented() );  242     }  243 };  244    245 })( jQuery );