Show content on link_to using hover (rails)

Question

Currently I have a link_to that when clicked it opens a popup. I want to add a function so that when I hover on the link it shows certain content. I want to show the users who liked a post similar to facebook likes when you mouseover.

Upon hover I want to show who liked the post via

render micropost.voters_who_voted

microposts/_micropost:

<%= link_to into_it_micropost_path(micropost.id), :onclick => "javascript:window.open('/microposts/#{micropost.id}/into_it','popup','width=285,height=300,top=315,left=200');", id: "feeditemlikes_#{micropost.id}", remote: true do %>
  <%= "#{micropost.votes_for} Into it!" %>
    <ul class="likes">
      <%= render micropost.voters_who_voted %>
    </ul>
<% end %>

CSS:

[id^=feeditemlikes] {
  .likes { display: none; }
  &:hover {
    text-decoration: none;
    color: $blue;
    .likes { display: block; }
}

}

Answer 1

If you want to show certain content on hover using CSS, then that content must be a child element of the element that receives :hover (in this case the link). For example:

ERB:

<%= link_to into_it_micropost_path(micropost.id), :onclick => "javascript:window.open('/microposts/#{micropost.id}/into_it','popup','width=285,height=300,top=315,left=200');", id: "feeditemlikes_#{micropost.id}", remote: true do %>
  <%= "#{micropost.votes_for} Into it!" %>
  <ul class="users">
    <%= render @user.names %>
  </ul>
<% end %>

SCSS:

[id^=feeditemlikes] {
  .users { display: none; }
  &:hover {
    text-decoration: none;
    color: $blue;
    .users { display: block; }
  }
}

(By the way, instead of using [id^=feeditemlikes], I would put a class on the link and refer to that. See below.)

But if you want to show content on hover that is not a child element of the link, then you need to use JavaScript.

Here's an example using CoffeeScript and jQuery:

$('a.feed-item-likes').hover ->
  $('.users').toggle()

Answer 2

You can use a plugin like this: http://jqueryui.com/tooltip/ To create a tooltip when hovering over the link. What you do is have your view-level code print out the content in a title tag for the link, and the plugin will pop it up for you.