# File app/helpers/admin/article_categories_helper.rb, line 3
 3:   def display_categories(categories, parent_id)
 4:     ret = "<ul>" 
 5:       for category in categories
 6:         if category.parent_id == nil
 7:           category.parent_id = 0
 8:         elsif category.parent_id == parent_id
 9:           ret << display_category(category)
10:         end
11:       end
12:     ret << "</ul>" 
13:   end

    # File app/helpers/admin/article_categories_helper.rb, line 15
15:   def display_category(category)
16:     ret = "<li>"
17:     ret << link_to(h(category.name), :action => "edit", :id => category)
18:     ret << " - " << h(category.description)
19:     ret << display_categories(category.children, category.id) if category.children.any?
20:     ret << "</li>" 
21:   end

    # File app/helpers/admin/article_categories_helper.rb, line 23
23:   def tree_select(categories, model, name, selected=0, allow_root = true, level = 0, init = true)
24:     html = ""
25:     if init
26:       html << "<select name=\"#{model}[#{name}]\" id=\"#{model}_#{name}\">\n"
27:       if allow_root
28:         # The "Root" option is added
29:         # so the user can choose a parent_id of 0
30:         html << "\t<option value=\"0\""
31:         html << " selected=\"selected\"" if selected.parent_id == 0
32:         html << ">Root</option>\n"
33:       end
34:     end
35: 
36:     if categories.length > 0
37:       level += 1 # keep position
38:       categories.collect do |cat|
39:         html << "\t<option value=\"#{cat.id}\" style=\"padding-left:#{level * 10}px\""
40:         # TODO: we need to be able to tell this routine what field to look at to determine parent ID
41:         # with articles it is article_category_id
42:         # with article_categories it is parent_id
43:         if model == "article"
44:           html << ' selected="selected"' if cat.id == selected.article_category_id
45:         else  
46:           html << ' selected="selected"' if cat.id == selected.parent_id
47:         end
48:         html << ">#{cat.name}</option>\n"
49:         html << tree_select(cat.children, model, name, selected, allow_root, level, false)
50:       end
51:     end
52:     html << "</select>\n" if init
53:     return html
54:   end