Add style to export xlsx file.

app/views/admin/seminars/export.xlsx.axlsx

@@ -33,15 +33,20 @@ wb.add_worksheet(name: (@seminar.title.to_s[0..27]+'...')) do |sheet|
       row << rf.title
     end
   end
-
-  sheet.add_row row
-
-  @seminar_signups.each do |signup|
-    types = {}
+  highlight_style = wb.styles.add_style(
+    :bg_color => 'ffeb3b',
+    :b        => true,
+    :border => { :style => :thick, :color => "000000", :edges => [:top, :left, :bottom, :right] },
+    :alignment => {:horizontal => :center, :vertical => :center, :wrap_text => true}
+  )
+  sheet.add_row row, :style => (0...row.count).collect{ highlight_style }
+  date_time_style = wb.styles.add_style({:format_code => 'yyyy/mm/dd hh:mm', :alignment => {:horizontal => :center, :vertical => :center, :wrap_text => true}})
+  wrap_text_style = wb.styles.add_style({:alignment => {:horizontal => :center, :vertical => :center, :wrap_text => true}})
+  types = [:time]
+  styles = [date_time_style]
+  @seminar_signups.each_with_index do |signup, i|
     row2 = []
-
-    row2 << "#{signup.created_at} "
-    types[1] = :string
+    row2 << signup.created_at
     row2 << "#{signup.display_serial_number}"
     row2 << "#{signup[:name]} "
     row2 << "#{signup.unit} "
@@ -51,7 +56,6 @@ wb.add_worksheet(name: (@seminar.title.to_s[0..27]+'...')) do |sheet|
     row2 << "#{signup.address} "
     row2 << "#{signup[:email]} "
     row2 << "#{signup.note} "
-
     @seminar.seminar_signup_fields.asc(:_id).each  do |rf| 
       if rf.can_muti_lang_input?
         @site_in_use_locales.each do |l|
@@ -61,10 +65,14 @@ wb.add_worksheet(name: (@seminar.title.to_s[0..27]+'...')) do |sheet|
         row2 << (@seminar.get_attribute_value(rf,signup.id).get_value_by_locale(I18n.locale) rescue '')
       end
     end
-    types = (0...row2.count).map{|i| types[i]}
-    sheet.add_row row2 , :types => types
+    if i == 0
+      (0...(row2.count - 1)).each do |i|
+        types << :string
+        styles << wrap_text_style
+      end
+    end
+    sheet.add_row row2 , :types => types, :style => styles
   end
- 
 
 end