小胡子模板:如何为非空列表仅输出一次阻止 [英] Mustache templates: How to output a block only once for non-empty lists

问题描述

如果我的列表为空，我想输出以下内容:

If my list is empty, I want to output this:

<div id="some-id">
</div>

如果我的列表非空，我想输出以下内容:

If my list is non-empty, I want to output this:

<div id="some-id">
  <ul>
    <li>Item 1</li>
    <li>Item 2</li>
    <li>etc</li>
  </ul>
</div>

请注意，仅当列表为非空时，我最多输出一次<ul>和</ul>标记 .

Note that I output the <ul> and </ul> tags at most once, and only if the list is non-empty.

以下代码与我在PHP中的实现方式非常接近，但显然是错误的:

The following code is close to how I would do this in PHP, but is obviously wrong:

<div id="some-id">
{{#items}}
  <ul>
{{/items}}

{{#items}}
    <li>{{name}}</li>
{{/items}}

{{#items}}
  </ul>
{{/items}}
</div>

如果items是3个项目列表，我将得到3个<ul>-显然不是我想要的.

If items is a 3 item list, I'm going to get 3 <ul>'s - obviously not what I want.

我意识到我可以将其他键设置为布尔标志(也许是hasItems)，但这感觉很多余.

I realise I could set some other key as a boolean flag (hasItems, perhaps), but this feels redundant.

对于非空列表，我是否可以只输出一次块呢?

Is there a more elegant way I can output a block only once for a non-empty list?

推荐答案

您可以使用非false值. name必须是items

You could use non-false values of a section. name would have to be an object inside of items

data = { 'items' : { 'name' : ["Item 1", "Item 2", "etc"] } };

您的模板如下所示:

<div id="some-id">
    {{#items}}
    <ul>
        {{#name}}
        <li>{{.}}</li>
        {{/name}}
    </ul>
    {{/items}}
</div>

这是jsFiddle上的一个示例，该示例显示具有名称且不带- http:/的items对象的呈现. /jsfiddle.net/maxbeatty/fpQwk/

Here's an example on jsFiddle showing the rendering of an items object with names and without -- http://jsfiddle.net/maxbeatty/fpQwk/

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