Module: Facepalm::Rails::Helpers::JavascriptHelper

Included in:
Facepalm::Rails::Helpers
Defined in:
lib/facepalm/rails/helpers/javascript_helper.rb

Instance Method Summary collapse

Instance Method Details

#fb_connect_js(*args, &block) ⇒ Object

A helper to integrate Facebook Connect to the current page. Generates a JavaScript code that initializes Facebook Javascript client for the current application.

Parameters:

  • app_id —

    Facebook App ID of the application. Defaults to value provided by the current config.

  • options —

    A hash of options for JavaScript generation. Available options are: :cookie - Enable cookie generation for the application. Default to true. :status - Enable login status check. Defaults to true. :xfbml - Enable XFBML tag parsing. Default to true. :frictionless - Enable frictionless app request delivery. Defaults to true :locale - Locale to use for JavaScript client. Defaults to ‘en_US’. :weak_cache - Enable FB JS client cache expiration every minute. Defaults to false. :async - Enable asynchronous FB JS client code load and initialization. Defaults to false. :cache_url - An URL to load custom or cached version of the FB JS client code. Not used by default.

  • &block —

    A block of JS code to be inserted in addition to FB client initialization code.



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# File 'lib/facepalm/rails/helpers/javascript_helper.rb', line 21

def fb_connect_js(*args, &block)
  options = args.extract_options!

  app_id  = args.shift || facepalm.app_id

  options.reverse_merge!(
    :cookie       => true,
    :status       => true,
    :xfbml        => true,
    :frictionless => true,
    :locale       => "en_US"
  )

  extra_js = capture(&block) if block_given?

  init_js = <<-JAVASCRIPT
    FB.init({
      appId  : '#{ app_id }',
      status : #{ options[:status] },
      cookie : #{ options[:cookie] },
      xfbml  : #{ options[:xfbml] },
      frictionlessRequests : #{ options[:frictionless] },
      channelUrl : '#{ options[:channel_url] || 'null' }'
    });
  JAVASCRIPT

  init_js = "FB._https = true; #{ init_js }" if request.ssl?

  js_url = "connect.facebook.net/#{options[:locale]}/all.js"
  js_url << "?#{Time.now.change(:min => 0, :sec => 0, :usec => 0).to_i}" if options[:weak_cache]

  if options[:async]
    js = <<-JAVASCRIPT
      window.fbAsyncInit = function() {
        #{init_js}
        #{extra_js}
      };

      (function() {
        var e = document.createElement('script');
        e.src = document.location.protocol + '//#{ js_url }';
        e.async = true;
        document.getElementById('fb-root').appendChild(e);
      }());
    JAVASCRIPT

    js = <<-CODE
      <div id="fb-root"></div>
      <script type="text/javascript">#{ js }</script>
    CODE
  else
    js = <<-CODE
      <div id="fb-root"></div>
      <script src="#{ request.protocol }#{ js_url }" type="text/javascript"></script>
    CODE

    if options[:cache_url]
      js << <<-CODE
        <script type="text/javascript">
          window.FB || document.write(unescape(\"%3Cscript src='#{ options[:cache_url] }' type='text/javascript'%3E%3C/script%3E\"));
        </script>
      CODE
    end

    js << <<-CODE
      <script type="text/javascript">
        if(typeof FB !== 'undefined'){
          #{init_js}
          #{extra_js}
        }
      </script>
    CODE
  end

  js = js.html_safe

  if block_given? && ::Rails::VERSION::STRING.to_i < 3
    concat(js)
  else
    js
  end
end