How to open facebook login form in pop up box while sign in with facebook

I am implementing sign in with Facebook in my web application. I am using omniauth gem for it. I want to open lo开发者_高级运维gin to facebook form in new pop up. How can I do that? Please help.

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I'm assuming that you have OmniAuth working in general, and are only curious about how to do it in a new window. If you haven't set up OmniAuth yet, there's a great RailsCast about it here.

OmniAuth shouldn't have any problems with working in a pop-up out of the box. To start with, just include target='_blank' on your login page, like so:

<%= link_to "Log in with Facebook", "/auth/facebook", :target => '_blank' %>

This should load the Facebook authorization page in a new window, and you should be able to get through the entire OAuth process. Once you've finished OAuth, however, you will need to render a template that includes some javascript to handle closing of the page. Here's the pattern we follow:

<script language='javascript'>
  if (opener.authenticationSuccessful) {
    opener.authenticationSuccessful();
  } else {
    opener.location.href = "<%= root_path %>"; // your 'login path'
  }
  window.close();
</script>

This works well for us, since it allows us to override the default behavior (go to the root login page) on a page by page basis (for instance, if someone is only adding an authentication to an existing session), but by default, will do what you expect without any additional work.