Meteor Spacebars {{#if someCondition}} shows data briefly on page refresh

Question

I have tried this a couple different ways and they both behave the same way (see below for code). I\'m using a spacebars if condition (and tried using a helper as well) to check

Answer 1

You can use instead, the currentUser helper from accounts package, like this.

{{#if currentUser}}

{{else}}
 {{> login }} 
{{/if}}

Iron Router Option.

There is also a solution in the router level, using Router.onBeforeAction.

// lib/routes.js
// Create the function to check login.
   var requireLogin = function() {
       if (! Meteor.user()) {
          this.render('login');
        } else {
          this.next(); //using this.next the iron router will render the route named on the onBefore
      }
   }

   Router.onBeforeAction(requireLogin, {only: 'theRoute});

UPDATE

Template.headerTpl.helpers({
  isLogged:function(){
   if(Meteor.user()){
      return true;
    }else{
      return false;
    }
  }
})