From db045dbbf60b53dbe013ef25554fd013baf88134 Mon Sep 17 00:00:00 2001
From: David Heinemeier Hansson <david@loudthinking.com>
Date: Wed, 24 Nov 2004 01:04:44 +0000
Subject: Initial

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@4 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
---
 actionpack/lib/action_view/helpers/url_helper.rb | 78 ++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 actionpack/lib/action_view/helpers/url_helper.rb

(limited to 'actionpack/lib/action_view/helpers/url_helper.rb')

diff --git a/actionpack/lib/action_view/helpers/url_helper.rb b/actionpack/lib/action_view/helpers/url_helper.rb
new file mode 100644
index 0000000000..feda33d7c1
--- /dev/null
+++ b/actionpack/lib/action_view/helpers/url_helper.rb
@@ -0,0 +1,78 @@
+module ActionView
+  module Helpers
+    # Provides a set of methods for making easy links and getting urls that depend on the controller and action. This means that
+    # you can use the same format for links in the views that you do in the controller. The different methods are even named
+    # synchronously, so link_to uses that same url as is generated by url_for, which again is the same url used for
+    # redirection in redirect_to.
+    module UrlHelper
+      # Returns the URL for the set of +options+ provided. See the valid options in link:classes/ActionController/Base.html#M000021
+      def url_for(options = {}, *parameters_for_method_reference)
+        if Hash === options then options = { :only_path => true }.merge(options) end
+        @controller.send(:url_for, options, *parameters_for_method_reference)
+      end
+
+      # Creates a link tag of the given +name+ using an URL created by the set of +options+. See the valid options in
+      # link:classes/ActionController/Base.html#M000021. It's also possible to pass a string instead of an options hash to
+      # get a link tag that just points without consideration. The html_options have a special feature for creating javascript
+      # confirm alerts where if you pass :confirm => 'Are you sure?', the link will be guarded with a JS popup asking that question.
+      # If the user accepts, the link is processed, otherwise not.
+      def link_to(name, options = {}, html_options = {}, *parameters_for_method_reference)
+        convert_confirm_option_to_javascript!(html_options) unless html_options.nil?
+        if options.is_a?(String)
+          content_tag "a", name, (html_options || {}).merge({ "href" => options })
+        else
+          content_tag("a", name, (html_options || {}).merge({ "href" => url_for(options, *parameters_for_method_reference) }))
+        end
+      end
+
+      # Creates a link tag of the given +name+ using an URL created by the set of +options+, unless the current 
+      # controller, action, and id are the same as the link's, in which case only the name is returned (or the
+      # given block is yielded, if one exists). This is useful for creating link bars where you don't want to link 
+      # to the page currently being viewed.
+      def link_to_unless_current(name, options = {}, html_options = {}, *parameters_for_method_reference)
+        assume_current_url_options!(options)
+
+        if destination_equal_to_current(options)
+          block_given? ?
+            yield(name, options, html_options, *parameters_for_method_reference) :
+            html_escape(name)
+        else
+          link_to name, options, html_options, *parameters_for_method_reference
+        end
+      end
+
+      # Creates a link tag for starting an email to the specified <tt>email_address</tt>, which is also used as the name of the
+      # link unless +name+ is specified. Additional HTML options, such as class or id, can be passed in the <tt>html_options</tt> hash.
+      def mail_to(email_address, name = nil, html_options = {})
+        content_tag "a", name || email_address, html_options.merge({ "href" => "mailto:#{email_address}" })
+      end
+
+      private
+        def destination_equal_to_current(options)
+          params_without_location = @params.reject { |key, value| %w( controller action id ).include?(key) }
+
+          options[:action] == @params['action'] &&
+            options[:id] == @params['id'] &&
+            options[:controller] == @params['controller'] &&
+            (options.has_key?(:params) ? params_without_location == options[:params] : true) 
+        end
+
+        def assume_current_url_options!(options)
+          if options[:controller].nil?
+            options[:controller] = @params['controller']
+            if options[:action].nil?
+              options[:action] = @params['action']
+              if options[:id].nil? then options[:id] ||= @params['id'] end
+            end
+          end
+        end
+        
+        def convert_confirm_option_to_javascript!(html_options)
+          if html_options.include?(:confirm)
+            html_options["onclick"] = "return confirm('#{html_options[:confirm]}');"
+            html_options.delete(:confirm)
+          end
+        end
+    end
+  end
+end
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