使用查找助手的车把故障转移内容 [英] Handlebars Failover Content With Lookup Helper

问题描述

我正在寻找通过Lookup帮助器局部渲染车把的方法.这不是问题，我可以使用以下代码做到这一点:

I am looking to render a handlebars partial via the Lookup helper. This isn't a problem, I can do that with this code:

{{> (lookup . 'type') }}

但是，如果变量type没有呈现我的partials目录中的值，则抛出500错误.车把通过故障转移内容对此提供支持.如:

However, if the variable type doesn't render a value that is in my partials directory, then a 500 error throws. Handlebars supports this with failover content. Such as:

{{#> myPartial }}
  Failover content
{{/myPartial}}

我的问题是，我可以将查找与故障转移结合起来吗?

My question is, can I combine the lookup with the failover?

我希望做类似的事情:

{{#> (lookup . 'type') }}
Failover content
{{/(lookup . 'type')}}

推荐答案

谢谢@ 76484，但我想我找到了我想要的东西:

Thank you @76484 but I think I found what I was looking for:

{{#> (lookup . 'type') }}<!-- Return Nothing if Undefined -->{{/undefined}}

这避免了需要帮助者，并且完全满足了我的需求！

This avoids the need for a helper, and does exactly what I was looking for!

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