流星需要时间来了解是否有{{currentUser}} [英] Meteor takes time to know if there's a {{currentUser}} or not

问题描述

我有一些代码只在有noUser时才运行，而有一些代码只有在currentUser时才运行.
所有这些都在导航模板中.像这样...

I've a few code that I want to run only when there's noUser and a few when there's a currentUser.
All these are inside the navigation template. Like so...

   {{#if currentUser}}  
     <li class="nav"><a href="{{pathFor 'create'}}">Post</a>  
     </li>  
     <li class="nav"><a>Ola, {{thisUser}}!</a>  
     </li>  
     <li class="nav"><a href="#" id="logout">Log Out</a>  
     </li>  
   {{/if}}  

   {{#if noUser}}  
      <li class="nav"><a href="{{pathFor 'signup'}}">Sign Up</a>  
      </li>  
      <li class="nav"><a href="{{pathFor 'login'}}">Login</a>  
      </li>  
   {{/if}}  

所以问题是当出现currentUser(即，我已登录)并且刷新页面时，首先显示{{#if noUser}}块中的代码，然后显示{{#if currentUser}}块而{{#if noUser}}块只能在没有用户的情况下显示.
这是模板的帮助程序代码.

So the problem is that when there's a currentUser(i.e, I'm logged in) and I refresh the page, the code inside the {{#if noUser}} block shows up first then the {{#if currentUser}} block, while the {{#if noUser}} block was only meant to show up when there is no user.
Here's the helper code for the template..

Template.navigation.helpers({

    thisUser: function () {
            return Meteor.user().username;

    },

    noUser: function () {
        var user = Meteor.user();

        if (!user) {
            return true;
        };
    }


});

不知道我在做什么错. :(
请帮忙.

Don't know what am I doing wrong here. :(
Please help.

推荐答案

您应使用if else条件代替noUser helper.为了防止在登录时显示"noUser"块，您必须使用 {{loggingIn}}帮助器.像这样:

You should use if else conditions instead of noUser helper. And to prevent showing "noUser" block while logging in you have to use {{ loggingIn }} helper. Something like this:

{{#if loggingIn}}
  <p>Loggin in...</p>
{{else}}
  {{#if currentUser}}  
    <li class="nav"><a href="{{pathFor 'create'}}">Post</a>  
    </li>  
    <li class="nav"><a>Ola, {{thisUser}}!</a>  
    </li>  
    <li class="nav"><a href="#" id="logout">Log Out</a>  
    </li>  
  {{else}}  
    <li class="nav"><a href="{{pathFor 'signup'}}">Sign Up</a>  
    </li>  
    <li class="nav"><a href="{{pathFor 'login'}}">Login</a>  
    </li>  
  {{/if}}
{{/if}}

因为Meteor不能立即知道用户是否已登录.因此，您必须使用loggingIn助手.

Because Meteor does not know immediately whether user is logged in or not. Therefore you have to use loggingIn helper.

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