Deprecate `button_to_function` and `link_to_function` helpers.

We recommend the use of Unobtrusive JavaScript instead. For example:

  link_to "Greeting", "#", :class => "nav_link"

  $(function() {
    $('.nav_link').click(function() {
      // Some complex code

      return false;
    });
  });

or

  link_to "Greeting", '#', onclick: "alert('Hello world!'); return false", class: "nav_link"

for simple cases.

This reverts commit 3acdd65.

actionpack/CHANGELOG.md

@@ -1,5 +1,27 @@
## Rails 4.0.0 (unreleased) ##

*   Deprecate `button_to_function` and `link_to_function` helpers.

    We recommend the use of Unobtrusive JavaScript instead. For example:

      link_to "Greeting", "#", :class => "nav_link"

      $(function() {
        $('.nav_link').click(function() {
          // Some complex code

          return false;
        });
      });

    or

      link_to "Greeting", '#', onclick: "alert('Hello world!'); return false", class: "nav_link"

    for simple cases.

    *Rafael Mendonça França*

*   `javascript_include_tag :all` will now not include `application.js` if the file does not exists. *Prem Sichanugrist*

*   Send an empty response body when call `head` with status between 100 and 199, 204, 205 or 304.
@@ -146,8 +168,6 @@
*   Replace `include_seconds` boolean argument with `:include_seconds => true` option
    in `distance_of_time_in_words` and `time_ago_in_words` signature. *Dmitriy Kiriyenko*

*   Remove `button_to_function` and `link_to_function` helpers. *Rafael Mendonça França*

*   Make current object and counter (when it applies) variables accessible when
    rendering templates with :object / :collection. *Carlos Antonio da Silva*

actionpack/lib/action_view/helpers/javascript_helper.rb

@@ -67,6 +67,46 @@ def javascript_tag(content_or_options_with_block = nil, html_options = {}, &bloc
      def javascript_cdata_section(content) #:nodoc:
        "\n//#{cdata_section("\n#{content}\n//")}\n".html_safe
      end

      # Returns a button whose +onclick+ handler triggers the passed JavaScript.
      #
      # The helper receives a name, JavaScript code, and an optional hash of HTML options. The
      # name is used as button label and the JavaScript code goes into its +onclick+ attribute.
      # If +html_options+ has an <tt>:onclick</tt>, that one is put before +function+.
      #
      #   button_to_function "Greeting", "alert('Hello world!')", :class => "ok"
      #   # => <input class="ok" onclick="alert('Hello world!');" type="button" value="Greeting" />
      #
      def button_to_function(name, function=nil, html_options={})
        message = "button_to_function is deprecated and will be removed from Rails 4.1. Use Unobtrusive JavaScript instead."
        ActiveSupport::Deprecation.warn message

        onclick = "#{"#{html_options[:onclick]}; " if html_options[:onclick]}#{function};"

        tag(:input, html_options.merge(:type => 'button', :value => name, :onclick => onclick))
      end

      # Returns a link whose +onclick+ handler triggers the passed JavaScript.
      #
      # The helper receives a name, JavaScript code, and an optional hash of HTML options. The
      # name is used as the link text and the JavaScript code goes into the +onclick+ attribute.
      # If +html_options+ has an <tt>:onclick</tt>, that one is put before +function+. Once all
      # the JavaScript is set, the helper appends "; return false;".
      #
      # The +href+ attribute of the tag is set to "#" unless +html_options+ has one.
      #
      #   link_to_function "Greeting", "alert('Hello world!')", :class => "nav_link"
      #   # => <a class="nav_link" href="#" onclick="alert('Hello world!'); return false;">Greeting</a>
      #
      def link_to_function(name, function, html_options={})
        message = "link_to_function is deprecated and will be removed from Rails 4.1. Use Unobtrusive JavaScript instead."
        ActiveSupport::Deprecation.warn message

        onclick = "#{"#{html_options[:onclick]}; " if html_options[:onclick]}#{function}; return false;"
        href = html_options[:href] || '#'

        content_tag(:a, name, html_options.merge(:href => href, :onclick => onclick))
      end
    end
  end
end

actionpack/test/template/javascript_helper_test.rb

@@ -42,6 +42,48 @@ def test_escape_javascript_with_safebuffer
    assert_instance_of ActiveSupport::SafeBuffer, escape_javascript(ActiveSupport::SafeBuffer.new(given))
  end

  def test_button_to_function
    assert_deprecated "button_to_function is deprecated and will be removed from Rails 4.1. Use Unobtrusive JavaScript instead." do
      assert_dom_equal %(<input type="button" onclick="alert(&#x27;Hello world!&#x27;);" value="Greeting" />),
        button_to_function("Greeting", "alert('Hello world!')")
    end
  end

  def test_button_to_function_with_onclick
    assert_deprecated "button_to_function is deprecated and will be removed from Rails 4.1. Use Unobtrusive JavaScript instead." do
      assert_dom_equal "<input onclick=\"alert(&#x27;Goodbye World :(&#x27;); alert(&#x27;Hello world!&#x27;);\" type=\"button\" value=\"Greeting\" />",
        button_to_function("Greeting", "alert('Hello world!')", :onclick => "alert('Goodbye World :(')")
    end
  end

  def test_button_to_function_without_function
    assert_deprecated "button_to_function is deprecated and will be removed from Rails 4.1. Use Unobtrusive JavaScript instead." do
      assert_dom_equal "<input onclick=\";\" type=\"button\" value=\"Greeting\" />",
        button_to_function("Greeting")
    end
  end

  def test_link_to_function
    assert_deprecated "link_to_function is deprecated and will be removed from Rails 4.1. Use Unobtrusive JavaScript instead." do
      assert_dom_equal %(<a href="#" onclick="alert(&#x27;Hello world!&#x27;); return false;">Greeting</a>),
        link_to_function("Greeting", "alert('Hello world!')")
    end
  end

  def test_link_to_function_with_existing_onclick
    assert_deprecated "link_to_function is deprecated and will be removed from Rails 4.1. Use Unobtrusive JavaScript instead." do
      assert_dom_equal %(<a href="#" onclick="confirm(&#x27;Sanity!&#x27;); alert(&#x27;Hello world!&#x27;); return false;">Greeting</a>),
        link_to_function("Greeting", "alert('Hello world!')", :onclick => "confirm('Sanity!')")
    end
  end

  def test_function_with_href
    assert_deprecated "link_to_function is deprecated and will be removed from Rails 4.1. Use Unobtrusive JavaScript instead." do
      assert_dom_equal %(<a href="http://example.com/" onclick="alert(&#x27;Hello world!&#x27;); return false;">Greeting</a>),
        link_to_function("Greeting", "alert('Hello world!')", :href => 'http://example.com/')
    end
  end

  def test_javascript_tag
    self.output_buffer = 'foo'