Support generating chart Javascript without <script> tag

lib/google_visualr/app/helpers/view_helper.rb

@@ -10,8 +10,8 @@ module ViewHelper
         helper_method "render_chart"
       end
 
-      def render_chart(chart, dom)
-        chart.to_js(dom).html_safe
+      def render_chart(chart, dom, options = {})
+        chart.to_js(dom, options).html_safe
       end
 
     end

lib/google_visualr/base_chart.rb

@@ -37,8 +37,9 @@ def add_listener(event, callback)
     # Parameters:
     #  *div_id            [Required] The ID of the DIV element that the Google Chart should be rendered in.
 
-    def to_js(element_id)
-      js  = "\n<script type='text/javascript'>"
+    def to_js(element_id, options = {})
+      js =  ""
+      js << "\n<script type='text/javascript'>" unless options[:script_tag] == false
       js << "\n  google.load('visualization','1', {packages: ['#{package_name}'], callback: #{chart_function_name(element_id)}});"
       js << "\n  function #{chart_function_name(element_id)}() {"
       js << "\n    #{@data_table.to_js}"
@@ -48,7 +49,7 @@ def to_js(element_id)
       end
       js << "\n    chart.draw(data_table, #{js_parameters(@options)});"
       js << "\n  };"
-      js << "\n</script>"
+      js << "\n</script>" unless options[:script_tag] == false
       js
     end
   end

spec/google_visualr/base_chart_spec.rb

@@ -48,6 +48,12 @@
     it "generates JS" do
       js = @chart.to_js("body")
       js.should == base_chart_js("body")
+      js.should include("<script")
+    end
+
+    it "generates JS without script tag" do
+      js = @chart.to_js("body", :script_tag => false)
+      js.should_not include("<script")
     end
 
     it "generates JS with listeners" do