Mustache - 我怎样才能*一次*为一个迭代做一些事情? [英] Mustache - how can I do something *once* for an iterable?

问题描述

假设我有一个 user，他有很多 items

Say I have a user, who has many items

如果items 中有最后一个项目，我怎么能有一个单亲爱的，你有项目！"?

How can I have a single 'Sweet, you have items!', provided there's at last one item in items?

{{#user.items}}
  Sweet, you have items!
{{/user.items}}

注意:我知道我可以为每个项目创建一个重复的部分.但现在我不想那样做.

Note: I know I can create a section that will repeat for each item. But right now I don't want to do that.

推荐答案

答案(就像 Mustache 的大多数东西一样)是在渲染之前准备好你的视图模型":)

The answer (like most things Mustache) is "prepare your view model before rendering" :)

但是如果你不喜欢这个，你通常可以像这样在 Mustache.js 中伪造它:

But if you're not into that, you can usually fake it in Mustache.js like this:

{{# user.items.0 }}
  Sweet, you have items!
{{/ user.items.0 }}

(更多的 Mustachey 方法是向用户添加一个 hasItems 属性或函数并使用它)

(The more Mustachey way would be to add a hasItems property or function to the user and use that instead)

{{# user.items.length }} 做同样的事情，并且不会污染您的上下文堆栈.你应该改用它.

{{# user.items.length }} does the same thing, and doesn't pollute your context stack quite as much. You should use that instead.

嗯，真的，你应该使用视图模型.但第二好的应该是 user.items.length.

这篇关于Mustache - 我怎样才能*一次*为一个迭代做一些事情?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！