javascript - In Meteor.js, Why is this.userId == undefined? -

i'm learning meteor following book, , right want insert() userid of user logged in.

template.categories.events({      'keyup #add-category': function(e, t) {         if(e.which == 13) {           var catval = string(e.target.value || "");           if(catval) {             lists.insert({category: catval, owner: this.userid});             console.log(this.userid);             session.set('adding_category',false);           }         }     }, 

however this.userid undefined, insert() didnt work expected. what's missing working?

somehow works in code below (userid defined):

lists.allow({     insert: function(userid, doc) {       return adminuser(userid);     },     update: function(userid, docs, fields, modifier) {       return adminuser(userid);     },     remove: function(userid, docs) {       return adminuser(userid);     } }); 

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update

why on server-side, this.userid works not meteor.userid()?

meteor.publish("categories", function() {     return lists.find({owner:this.userid}, {fields:{category:1}}); }); 

you should use meteor.userid() instead.