Facebook Connect FB.getLoginStatus问题~JS SDK

Question

我无法直接执行FB.getLoginStatus（）方法。当用户单击操作按钮时，我调用FB.getLoginStatus（），但是返回“Undefined”。当我重新加载页面时，FB.getLoginStatus（）可以正常工作。如何在页面中按需使用FB.getLoginStatus（）。我附上了我的源代码。

函数_checkFBStatus（）在用户单击操作按钮时调用FB.getLoginStatus（）。

此点击事件是一切发生的地方。我必须实施一个黑客才能让它发挥作用。一旦FB.login回调执行，我重定向到同一页面并调用FB.getLoginStatus（）。我宁愿不使用这个黑客：

        $('ul.fb')
            .click( function( event )
            {
                if( _checkFBStatus() )
                {
                    _getFriends();

                }else
                {
                    _login();   

                }   
            }
        );

以下是完整的源代码：

head.ready(function() {
       // --------------------------------------------------------------------

       /**
        * execute the facebook events
        * @desc     Facebook events executions with custom callbacks
        */


    (function($){

       // --------------------------------------------------------------------

       /**
        * Default vars
        * @desc     set up the default variables
        */

        var
        fql         = 'SELECT first_name,last_name, pic_small , uid, is_app_user FROM user WHERE uid IN (SELECT uid2 FROM friend where uid1 = {0} )  AND is_app_user=1',
        fbOptions   =           
                {
                    appId: 'xxxxxxxxxxxxxxxx', 
                    status: true, 
                    cookie: true, 
                    xfbml: true
                },

        e           = document.createElement('script');
        e.src       = document.location.protocol + '//connect.facebook.net/en_US/all.js';
        e.async     = true;
        document.getElementById('fb-root').appendChild(e);



        window.fbAsyncInit = function() 
        {
            FB.init( fbOptions );

            FB
            .getLoginStatus( function( response ) 
                {   
                    if( MYNYTE.getURLVars()['success'].length > 0 ) _getFriends();              
                }
            );


        };


       // --------------------------------------------------------------------

       /**
        * Click initial action
        * @desc     Start the facebook process
        * @acces    public  
        */




        $('ul.fb')
            .click( function( event )
            {
                if( _checkFBStatus() )
                {
                    _getFriends();

                }else
                {
                    _login();   

                }   
            }
        );


       // --------------------------------------------------------------------

       /**
        * Check Status
        * @desc     Check the status of the user
        * @acces    private 
        */


        function _checkFBStatus()
        {
            FB
            .getLoginStatus( function( response ) 
                {   
                    if (response.status == 'connected') 
                    {
                        return true;
                    } 
                    else 
                    {
                        return false;
                    }
                }
            );      

        }

       // --------------------------------------------------------------------

       /**
        * Login
        * @desc     Try to log the user in and then call the getFriends method
        * @acces    private 
        */


        function _login()
        {
            FB
            .login( function( response ) 
                {
                    window.location = '/connections?success=true#connections';
                }, 
                {scope: 'email'}
            );  
        }



       // --------------------------------------------------------------------

       /**
        * Get Friends
        * @desc     Try to get the user's frends that are associated with MyNyte
        */


        function _getFriends()
        {
            FB.api('/me', 
                function( response ) 
                {
                    var query = FB.Data.query( fql, response.id );

                    FB.Data.waitOn([ query ], 
                        function( fbReturn ) {

                            var ret = _parseFBReturn( fbReturn );

                        }//end callback

                    );//end fb JS Wait On

                }// end FB api callback

            );//end api 

        }//end getFriends


       // --------------------------------------------------------------------

       /**
        * Parse The return FB
        * @desc     Try to parse the return facebook query
        * @params   array 
        * @acces    private 
        */



        function _parseFBReturn( data )
        {
            var 
            i, j            = 0,
            outerArgLength  = data.length,
            innerArgLength  = 0;

            for( i = 0; i <= outerArgLength; i++ )
            {
                innerArgLength = data[ i ].length;

                for( j = 0; j <= innerArgLength; j++ )
                {
                    _writeHTML( data[ i ][ j ] );
                }//end inner for

            }//end outer for



            return true;
        }

       // --------------------------------------------------------------------

       /**
        * Write the facebook HTML
        * @desc     Write the html for the facebook import
        * @params   array 
        * @acces    private 
        */


        function _writeHTML( user )
        {
            $('div#facebook-friends')
                .append(
                    $( '<h3 />')
                    .text( user.first_name + ' ' + user.last_name )
                )       
                .append( 
                    $( '<img />' )
                    .attr('src', user.pic_small )
                );

        }



    })(jQuery);
});

Answer 1

你有没有理由不使用FB.login的回复？它应包含与调用FB.getLoginStatus相同的连接信息。