为什么许多人使用“ - %>”而不是“%>”。在Rails? [英] Why many people use "-%>" instead of "%>" in Rails?

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问题描述

对不起,这个问题,我认为它更多的offtopic,但我找不到任何东西在谷歌!

Sorry for this question, i think its more offtopic, but i couldn't find anything on google!

我看到现在多次,很多人使用 - %> ,而不是仅仅%> 。有什么意义?

I saw now multiple times that a lot of people use -%> instead of just %>. Whats the sense?

示例:

<% @images.each_slice(6) do |slice| -%>
  <div class="gallery">
    <% slice.each do |image| -%>
      <%= image_tag(image.url, :alt => image.alt) %>
    <% end -%>
  </div>
<% end -%>

源:

Source: Rails each loop insert tag every 6 items?

在这里,他还使用了<$

Here he has also used -%> for all blocks.

推荐答案

我想添加一些我知道有关ERB的资源:

I would like to add some resources that I know about ERB :


  • Rails扩展 ERB ,以便您可以通过在Rails模板中的标签中添加结尾连字符来取消换行符

<ul>
  <% for @item in @items -%>
    <li><%= @item %></li>
  <% end -%>
</ul>


  • 注释标记使用 hash 符号:

     <%# This is just a comment %>
    


  • 具有 等于号的标签 表示封闭代码是一个表达式,并且渲染器应该在渲染模板时用代码结果(作为字符串)替换代码元素。使用表达式将一行代码嵌入到模板中,或显示变量的内容:

  • A tag with an equals sign indicates that enclosed code is an expression, and that the renderer should substitute the code element with the result of the code (as a string) when it renders the template. Use an expression to embed a line of code into the template, or to display the contents of a variable:

     Hello, <%= @name %>.
     Today is <%= Time.now.strftime('%A') %>.
    


  • 使用一个 等号 字符串将被编码。要避免编码,您可以使用两个 等号 (或 raw ):

        Hello, <%== @unencodedOutput %>
    


  • 不含 c> 符号表示附带的代码是 scriptlet 。每个scriptlet被捕获和执行,然后代码的最终结果被注入到 scriptlet 的输出。

  • Tags without the equals sign denote that the enclosed code is a scriptlet. Each scriptlet is caught and executed, and the final result of the code is then injected in to the output at the point of the scriptlet.

    <ul>
      <% for @item in @shopping_list %>
        <li><%= @item %></li>
      <% end %>
    </ul>
    

    Scriptlet最常用于将循环或条件逻辑嵌入到模板中:

    Scriptlets are most commonly used for embedding loops or conditional logic into templates:

    阅读 ERB模板介绍 了解更多。

    Read An Introduction to ERB Templating to know more.

    这篇关于为什么许多人使用“ - %&gt;”而不是“%&gt;”。在Rails?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!

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