set default issue start/due datepicker from due/start date (#14024)

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11883 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/helpers/application_helper.rb

@@ -1075,6 +1075,7 @@ module ApplicationHelper
 
   def include_calendar_headers_tags
     unless @calendar_headers_tags_included
+      tags = javascript_include_tag("datepicker")
       @calendar_headers_tags_included = true
       content_for :header_tags do
         start_of_week = Setting.start_of_week
@@ -1082,12 +1083,13 @@ module ApplicationHelper
         # Redmine uses 1..7 (monday..sunday) in settings and locales
         # JQuery uses 0..6 (sunday..saturday), 7 needs to be changed to 0
         start_of_week = start_of_week.to_i % 7
-
-        tags = javascript_tag(
+        tags << javascript_tag(
                    "var datepickerOptions={dateFormat: 'yy-mm-dd', firstDay: #{start_of_week}, " +
                      "showOn: 'button', buttonImageOnly: true, buttonImage: '" + 
                      path_to_image('/images/calendar.png') +
-                     "', showButtonPanel: true, showWeek: true, showOtherMonths: true, selectOtherMonths: true, changeMonth: true, changeYear: true};")
+                     "', showButtonPanel: true, showWeek: true, showOtherMonths: true, " +
+                     "selectOtherMonths: true, changeMonth: true, changeYear: true, " +
+                     "beforeShow: beforeShowDatePicker};")
         jquery_locale = l('jquery.locale', :default => current_language.to_s)
         unless jquery_locale == 'en'
           tags << javascript_include_tag("i18n/jquery.ui.datepicker-#{jquery_locale}.js")