什么是在轨道中定义锚标签的正确方法？ [英] What's the right way to define an anchor tag in rails?

问题描述

从文档（和google）中可以明显看出生成与分段的链接，例如播客/ 5＃评论。您只需将：anchor 的值传递给 link_to 。

It's obvious from the documentation (and google) how to generate a link with a segment e.g. podcast/5#comments. You just pass a value for :anchor to link_to.

我关心的是生成< a name =comments>评论< / a> 标签，即第一个链接的目的地。

My concern is about the much simpler task of generating the <a name="comments">Comments</a> tag i.e. the destination of the first link.

我尝试了以下方法，虽然它们似乎可行，但标记并非我所期望的：

I've tried the following, and although they seemed to work, the markup was not what I expected:

link_to "Comments", :name => "comments"
link_to "Comments", :anchor => "comments"

我想我错过了一些明显的东西。感谢。

I think I'm missing something obvious. Thanks.

推荐答案

当一个ruby函数接受一个散列值的单个参数时：

When a ruby function takes a single parameter that is a hash:

def foo(options)
  #options is a hash with parameters inside
end

您可以'忘记'放置括号/括号，然后像这样调用它：

You can 'forget' to put the parenthesis/brackets, and call it like this:

foo :param => value, :param2 => value

Ruby会填补空白，并且明白您要完成的是： p>

Ruby will fill out the blanks and understand that what you are trying to accomplish is this:

foo({:param => value, :param2 => value})

现在，对于您的问题： link_to 需要两个可选哈希 - 一个名为 options ，另一个 html_options 。你可以想象它是这样定义的（这是一个近似值，它更复杂）

Now, to your question: link_to takes two optional hashes - one is called options and the other html_options. You can imagine it defined like this (this is an approximation, it is much more complex)

def link_to(name, options, html_options)
...
end

现在，如果您调用它方式：

Now, if you invoke it this way:

link_to 'Comments', :name => 'Comments'

Ruby会有点困惑。它会尝试为你填补空白，但不正确：

Ruby will get a little confused. It will try to "fill out the blanks" for you, but incorrectly:

link_to('Comments', {:name => 'Comments'}, {}) # incorrect

它会认为 name => '评论'部分属于选项，而不是 html_options ！

It will think that name => 'Comments' part belongs to options, not to html_options!

您必须通过自己填补空白帮助红宝石。

You have to help ruby by filling up the blanks yourself. Put all the parenthesis in place and it will behave as expected:

link_to('Comments', {}, {:name => 'Comments'}) # correct

如果你想要删除最后一组括号：

You can actually remove the last set of brackets if you want:

link_to("Comments", {}, :name => "comments") # also correct

为了使用html_options，您必须保留第一组括号。例如，您需要为链接提供确认消息和名称：

In order to use html_options, you must leave the first set of brackets, though. For example, you will need to do this for a link with confirmation message and name:

link_to("Comments", {:confirm => 'Sure?'}, :name => "comments")

助手具有类似的构造（即 form_for ， collection_select ），所以您应该学习这种技巧。如有疑问，只需添加所有括号即可。

Other rails helpers have a similar construction (i.e. form_for, collection_select) so you should learn this technique. In doubt, just add all the parenthesis.

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