Rails 3.1.3使用锚属性和链接_to标签从帖子/索引到帖子/显示/ID无效 [英] Rails 3.1.3 using anchor attribute with link_to tag from posts/index to posts/show/id not working

问题描述

我在帖子/索引视图上使用link_to标记，并希望通过锚使其链接到我的帖子/显示/id视图，以使其向下滚动到评论表单.由于某种原因，我无法让锚工作.这是我的代码:

I am using a link_to tag on my posts/index view and want to link it to my posts/show/id view with an anchor that makes it scroll down to the comments form. For some reason I can't get the anchor to work. Here is my code:

帖子/索引中

<%= link_to 'Add a Comment', post, :anchor => 'comment_form' %>

这无法将#符号附加到链接的末尾，因此它只是localhost:3000/posts/id. 我还尝试了link_to的许多变体，包括:

This fails to append the # sign to the end of the link, so it is just localhost:3000/posts/id. I have also tried many variations for link_to, including:

<%= link_to 'Add a Comment', post(:anchor => 'comment_form' %>

和

<%= link_to 'Add a Comment', :controller => 'posts', :action => 'show', :id => @post, :anchor => 'comment_form' %>

但是我没有运气.

这是我的帖子#显示操作:

Here is my posts#show action:

  def show
    @post = Post.find(params[:id])

    respond_to do |format|
      format.html # show.html.erb
      format.json { render json: @post }
    end
  end

这是我希望锚点滚动到的帖子/显示视图:

and here is the posts/show view where I want the anchor to scroll to:

<h2><a name="comment_form" id="comment_form">Add a comment:</a></h2>

此外，如果我链接到索引页面上的某些内容，则上述任何方法均有效，因为我可以看到哈希值#已附加到输出的url中.由于某些原因，当尝试链接到显示页面时，它不起作用.有什么帮助吗?

Furthermore, any of the above works if I am linking to something on the index page, as I can see the hash # has been appended to the outputted url. For some reason it is not working when trying to link to the show page. Any help with this?

推荐答案

尝试一下:

link_to('Add a comment', post_path(post, :anchor => 'comment_form'))

link_to的第二个参数通常按原样传递给url_for，第三个参数用作最终生成的<a>元素的属性哈希.

The second argument to link_to is typically passed as-is to url_for, and the third argument is used as an attributes hash for the <a> element that ultimately gets generated.

因此，在第一个示例中，您将传递Post对象作为第二个参数，并传递一个哈希作为第三个参数.只有Post会被传递给url_for.它永远不会看到包含:anchor选项的哈希，因此您不会在生成的URL的末尾看到锚点. (但是您可能会在生成的<a>元素上看到一个anchor="comment_form"属性.)

So in your first example, you're passing a Post object as the second argument and a hash as the third argument. Only the Post would be passed to url_for. It never sees the hash containing the :anchor option, so you wouldn't see the anchor at the end of the generated URL. (But you would probably see an anchor="comment_form" attribute on the generated <a> element.)

您的第二个示例在语法上不正确.我想这会导致错误.

Your second example is syntactically incorrect. I imagine that resulted in an error.

您的第三个示例...应该有用.我不确定为什么没有:-)

Your third example...should've worked. I'm not sure why it didn't :-)

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