instance method method_javascript_function

# File actionpack/lib/action_view/helpers/url_helper.rb, line 590
        def method_javascript_function(method, url = '', href = nil)
          action = (href && url.size > 0) ? "'#{url}'" : 'this.href'
          submit_function =
            "var f = document.createElement('form'); f.style.display = 'none'; " +
            "this.parentNode.appendChild(f); f.method = 'POST'; f.action = #{action};"

          unless method == :post
            submit_function << "var m = document.createElement('input'); m.setAttribute('type', 'hidden'); "
            submit_function << "m.setAttribute('name', '_method'); m.setAttribute('value', '#{method}'); f.appendChild(m);"
          end

          if protect_against_forgery?
            submit_function << "var s = document.createElement('input'); s.setAttribute('type', 'hidden'); "
            submit_function << "s.setAttribute('name', '#{request_forgery_protection_token}'); s.setAttribute('value', '#{escape_javascript form_authenticity_token}'); f.appendChild(s);"
          end
          submit_function << "f.submit();"
        end