Added JavaScriptHelper#button_to_function that works just like...

Added JavaScriptHelper#button_to_function that works just like JavaScriptHelper#link_to_function but uses a button instead of a href [DHH]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@3367 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionpack/CHANGELOG

 *SVN*
 
+* Added JavaScriptHelper#button_to_function that works just like JavaScriptHelper#link_to_function but uses a button instead of a href [DHH]
+
 * Added that JavaScriptHelper#link_to_function will honor existing :onclick definitions when adding the function call [DHH]
 
 * Added :disable_with option to FormTagHelper#submit_tag to allow for easily disabled submit buttons with different text [DHH]

actionpack/lib/action_view/helpers/javascript_helper.rb

@@ -58,6 +58,20 @@ def link_to_function(name, function, html_options = {})
         )
       end
 
+      # Returns a link that'll trigger a JavaScript +function+ using the 
+      # onclick handler.
+      #
+      # Examples:
+      #   button_to_function "Greeting", "alert('Hello world!')"
+      #   button_to_function "Delete", "if confirm('Really?'){ do_delete(); }")
+      def button_to_function(name, function, html_options = {})
+        html_options.symbolize_keys!
+        tag(:input, html_options.merge({ 
+          :type => "button", :value => name, 
+          :onclick => (html_options[:onclick] ? "#{html_options[:onclick]}; " : "") + "#{function};" 
+        }))
+      end
+
       # Includes the Action Pack JavaScript libraries inside a single <script> 
       # tag. The function first includes prototype.js and then its core extensions,
       # (determined by filenames starting with "prototype").

actionpack/test/template/javascript_helper_test.rb

@@ -30,4 +30,9 @@ def test_link_to_function_with_existing_onclick
     assert_dom_equal %(<a href="#" onclick="confirm('Sanity!'); alert('Hello world!'); return false;">Greeting</a>), 
       link_to_function("Greeting", "alert('Hello world!')", :onclick => "confirm('Sanity!')")
   end
+
+  def test_button_to_function
+    assert_dom_equal %(<input type="button" onclick="alert('Hello world!');" value="Greeting" />), 
+      button_to_function("Greeting", "alert('Hello world!')")
+  end
 end