Is it possible to have Haml indent HTML generated by a view helper in Rails?

问题

Say I have a things resource with a view helper method such as:

module ThingsHelper
  def foo
    ret = ""
    3.times { ret += content_tag(:li, "foo") }
    content_tag(:ul, ret)
  end
end

This, then, is used in a template:

%p
  = foo

The HTML source that's generated looks like this:

<!DOCTYPE html>
<html>
    <head>
        <title>Foo</title>
    </head>
</html>
<body>
    <p>
        <ul><li>foo</li><li>foo</li><li>foo</li></ul>
    </p>
</body>

As you can see, the helper output is not indented as the rest of the code. Any way to remedy this?

回答1:

Try out the haml_tag helper method provided with Haml. It's like content_tag in some ways, but it outputs properly indented HTML. The main difference is that it outputs directly to the template, rather than returning a string. For example:

module ThingsHelper
  def foo
    haml_tag :ul do
      3.times { haml_tag(:li, "foo") }
    end
  end
end

(As a side note, it's considered very bad Ruby style to use something other than two spaces for indentation).

回答2:

I doubt it - at least not without a significant amount of mucking around.

Your = foo is simply printing what is returned by your foo helper - it's not getting parsed by haml. And you can't write haml in your helper method either.

The simplest way I can think of to deal with this is to just add literal whitespace characters in your helper (ie \n and \t).

You could also require the relevant haml class(es) in your helper and call the parsing methods manually on ret, but this is probably more complicated than worthwhile.

来源：https://stackoverflow.com/questions/1528166/is-it-possible-to-have-haml-indent-html-generated-by-a-view-helper-in-rails

标签

ruby-on-rails

haml