Ruby-on-rails 如何注释 rails html.erb 文件中的行？

How to comment lines in rails html.erb files?

提问by Hemanth

Am a newbie to rails , please let me know the way to comment out a single line and also to comment out a block of lines in *.html.erb files.

我是 rails 的新手，请让我知道如何注释掉一行以及注释掉 *.html.erb 文件中的一行行。

回答by Nikolaus Gradwohl

ruby on rails noteshas a very nice blogpost about commenting in erb-files

ruby on rails notes有一篇关于在 erb 文件中评论的非常好的博文

the short version is

简短版本是

to comment a single line use

注释单行使用

<%-# commented line -%>

to comment a whole block use a if falseto surrond your code like this

要评论整个块，请使用 aif false像这样包围您的代码

<% if false %>
code to comment
<% end %>

回答by Gerry

Note that if you want to comment out a single line of printing erb you should do like this

请注意，如果您想注释掉一行打印 erb，您应该这样做

<%#= ["Buck", "Papandreou"].join(" you ") %>

回答by Flak DiNenno

This is CLEANEST, SIMPLEST ANSWER for CONTIGUOUS NON-PRINTING Ruby Code:

这是连续非打印 Ruby 代码的最干净、最简单的答案：

The below also happens to answer the Original Poster's question without, the "ugly" conditional codethat some commenters have mentioned.

下面也恰好回答了原始海报的问题，而没有一些评论者提到的“丑陋”条件代码。

---

---

1. CONTIGUOUS NON-PRINTING Ruby Code

   • This will work in any mixedlanguage Rails Viewfile, e.g, *.html.erb, *.js.erb, *.rhtml, etc.

   • This should also work with STD OUT/printingcode, e.g. <%#= f.label :title %>

   • DETAILS:

     Rather than use rails brackets on each line and commenting in front of each starting bracket as we usually do like this:

       <%# if flash[:myErrors] %>
         <%# if flash[:myErrors].any? %>
           <%# if @post.id.nil? %>
             <%# if @myPost!=-1 %>
               <%# @post = @myPost %>
             <%# else %>
               <%# @post = Post.new %>
             <%# end %>
           <%# end %>
         <%# end %>
       <%# end %>
     

     YOU CAN INSTEAD add only one comment (hashmark/poundsign) to the first open Rails bracket if you write your code as one large block... LIKE THIS:

       <%# 
         if flash[:myErrors] then
           if flash[:myErrors].any? then
             if @post.id.nil? then
               if @myPost!=-1 then
                 @post = @myPost 
               else 
                 @post = Post.new 
               end 
             end 
           end 
         end 
       %>
     

1. 连续的非打印 Ruby 代码

   • 这适用于任何混合语言的Rails 视图文件，例如*.html.erb, *.js.erb, *.rhtml，等。

   • 这也应该适用于STD OUT/打印代码，例如<%#= f.label :title %>

   • 详情：

     而不是像我们通常这样做的那样在每一行上使用 rails 括号并在每个起始括号前注释：

       <%# if flash[:myErrors] %>
         <%# if flash[:myErrors].any? %>
           <%# if @post.id.nil? %>
             <%# if @myPost!=-1 %>
               <%# @post = @myPost %>
             <%# else %>
               <%# @post = Post.new %>
             <%# end %>
           <%# end %>
         <%# end %>
       <%# end %>
     

     如果你把你的代码写成一个大块，你可以改为只在第一个打开的 Rails 括号中添加一个注释（哈希标记/井号）......像这样：

       <%# 
         if flash[:myErrors] then
           if flash[:myErrors].any? then
             if @post.id.nil? then
               if @myPost!=-1 then
                 @post = @myPost 
               else 
                 @post = Post.new 
               end 
             end 
           end 
         end 
       %>