Ticket #933: send_ajax.diff

javascript_helper.rb

@@ -152 +152 @@
-      def escape_javascript(javascript)
-        (javascript || '').gsub(/\r\n|\n|\r/, "\\n").gsub(/["']/) { |m| "\\#{m}" }
-      end
+      
+      # helper function to send a javascript command to the client.
+      # options hash should have:
+      # :action => (:insert, :replace, :delete, :empty)
+      # :target => DOM element. (string name)
+      # :position => (:before, :top, :bottom, :after) 
+      #   postion is only used in the insert routines
+      # pass in a block of captured erb html for functions that make sense to do so.
+      def send_ajax(options, &block)
+        
+        if block then
+          # execute the block=  
+          # this code stolen from the capture helper
+          buffer = eval("_erbout", block.binding)
+          pos = buffer.length
+          block.call
+          
+          # extract the block 
+          data = buffer[pos..-1]
+          
+          # replace it in the original with empty string
+          buffer[pos..-1] = ''
+          text = escape_javascript(data)
+        end
+          
+        # Some discussion has been taking place on 
+        # http://wiki.rubyonrails.com/rails/show/Ajax%20Discussion
+        # as to whether this is the fastest way to manipulate the DOM
+        # At the moment, it appears the safest and most expedient
+        case options[:action]
+          when :insert
+            case options[:position]
+              when :before
+                "new Insertion.Before('#{options[:target]}', '#{text}')"
+              when :top
+                "new Insertion.Top('#{options[:target]}', '#{text}')"
+              when :bottom
+                "new Insertion.Bottom('#{options[:target]}', '#{text}')"
+              when :after
+                "new Insertion.After('#{options[:target]}', '#{text}')"
+              else
+                raise ArgumentError, "Invalid position, choose one of :before, :top, :bottom, :after"
+            end
+          when :replace
+            "$('#{target}').innerHTML = '#{text}'"         
+          when :empty
+            "$('#{target}').innerHTML = ''"
+          when :delete
+            "$('#{target}').parentNode.removeChild($('#{options[:target]}'))"
+          else
+            raise ArgumentError, "Invalid action, choos one of :insert, :replace, :delete, :empty"
+        end
+      
+      end
-
-    private
-      def options_for_ajax(options)