javascript - How to detect Google+ user logged in -


i've added basic code google+ api docs.

    function onsignin(googleuser) {   var profile = googleuser.getbasicprofile();    gapi.auth.checksessionstate({session_state: null}, function(isusernotloggedin){     if (isusernotloggedin) {         console.log('not logged in');       } else {         console.log('logged in');       }     });   /*   console.log('id: ' + profile.getid()); // not send backend! use id token instead.   console.log('name: ' + profile.getname());   console.log('image url: ' + profile.getimageurl());   console.log('email: ' + profile.getemail());   */    var id_token = googleuser.getauthresponse().id_token;   //console.log("id token: " + id_token);   $.post('login.asp', 'idtoken=' + id_token, function(data){     //console.log('passato login.asp, idtoken=' + data);   }); }

i see it's not way use it, how can check if user logged in or not, in order let him access authenticated user features?


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