如何注释 Rails html.erb 文件中的行？

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

the short version is

to comment a single line use

<%# commented line %>

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

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

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

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

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

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

1. CONTIGUOUS NON-PRINTING Ruby Code

   • This will work in any mixed language Rails View file, e.g, *.html.erb, *.js.erb, *.rhtml, etc.

   • This should also work with STD OUT/printing code, 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
     %>