3 # Provides methods for linking to ActionController::Pagination objects using a simple generator API. You can optionally
4 # also build your links manually using ActionView::Helpers::AssetHelper#link_to like so:
6 # <%= link_to "Previous page", { :page => paginator.current.previous } if paginator.current.previous %>
7 # <%= link_to "Next page", { :page => paginator.current.next } if paginator.current.next %>
8 module PaginationHelper
9 unless const_defined?(:DEFAULT_OPTIONS)
13 :always_show_anchors => true,
14 :link_to_current_page => false,
19 # Creates a basic HTML link bar for the given +paginator+. Links will be created
20 # for the next and/or previous page and for a number of other pages around the current
21 # pages position. The +html_options+ hash is passed to +link_to+ when the links are created.
24 # <tt>:name</tt>:: the routing name for this paginator
25 # (defaults to +page+)
26 # <tt>:prefix</tt>:: prefix for pagination links
27 # (i.e. Older Pages: 1 2 3 4)
28 # <tt>:suffix</tt>:: suffix for pagination links
29 # (i.e. 1 2 3 4 <- Older Pages)
30 # <tt>:window_size</tt>:: the number of pages to show around
31 # the current page (defaults to <tt>2</tt>)
32 # <tt>:always_show_anchors</tt>:: whether or not the first and last
33 # pages should always be shown
34 # (defaults to +true+)
35 # <tt>:link_to_current_page</tt>:: whether or not the current page
36 # should be linked to (defaults to
38 # <tt>:params</tt>:: any additional routing parameters
42 # # We'll assume we have a paginator setup in @person_pages...
44 # pagination_links(@person_pages)
45 # # => 1 <a href="/?page=2/">2</a> <a href="/?page=3/">3</a> ... <a href="/?page=10/">10</a>
47 # pagination_links(@person_pages, :link_to_current_page => true)
48 # # => <a href="/?page=1/">1</a> <a href="/?page=2/">2</a> <a href="/?page=3/">3</a> ... <a href="/?page=10/">10</a>
50 # pagination_links(@person_pages, :always_show_anchors => false)
51 # # => 1 <a href="/?page=2/">2</a> <a href="/?page=3/">3</a>
53 # pagination_links(@person_pages, :window_size => 1)
54 # # => 1 <a href="/?page=2/">2</a> ... <a href="/?page=10/">10</a>
56 # pagination_links(@person_pages, :params => { :viewer => "flash" })
57 # # => 1 <a href="/?page=2&viewer=flash/">2</a> <a href="/?page=3&viewer=flash/">3</a> ...
58 # # <a href="/?page=10&viewer=flash/">10</a>
59 def pagination_links(paginator, options={}, html_options={})
60 name = options[:name] || DEFAULT_OPTIONS[:name]
61 params = (options[:params] || DEFAULT_OPTIONS[:params]).clone
63 prefix = options[:prefix] || ''
64 suffix = options[:suffix] || ''
66 pagination_links_each(paginator, options, prefix, suffix) do |n|
68 link_to(n.to_s, params, html_options)
72 # Iterate through the pages of a given +paginator+, invoking a
73 # block for each page number that needs to be rendered as a link.
76 # <tt>:window_size</tt>:: the number of pages to show around
77 # the current page (defaults to +2+)
78 # <tt>:always_show_anchors</tt>:: whether or not the first and last
79 # pages should always be shown
80 # (defaults to +true+)
81 # <tt>:link_to_current_page</tt>:: whether or not the current page
82 # should be linked to (defaults to
86 # # Turn paginated links into an Ajax call
87 # pagination_links_each(paginator, page_options) do |link|
88 # options = { :url => {:action => 'list'}, :update => 'results' }
89 # html_options = { :href => url_for(:action => 'list') }
91 # link_to_remote(link.to_s, options, html_options)
93 def pagination_links_each(paginator, options, prefix = nil, suffix = nil)
94 options = DEFAULT_OPTIONS.merge(options)
95 link_to_current_page = options[:link_to_current_page]
96 always_show_anchors = options[:always_show_anchors]
98 current_page = paginator.current_page
99 window_pages = current_page.window(options[:window_size]).pages
100 return if window_pages.length <= 1 unless link_to_current_page
102 first, last = paginator.first, paginator.last
106 html << prefix if prefix
108 if always_show_anchors and not (wp_first = window_pages[0]).first?
109 html << yield(first.number)
110 html << ' ... ' if wp_first.number - first.number > 1
114 window_pages.each do |page|
115 if current_page == page && !link_to_current_page
116 html << page.number.to_s
118 html << yield(page.number)
123 if always_show_anchors and not (wp_last = window_pages[-1]).last?
124 html << ' ... ' if last.number - wp_last.number > 1
125 html << yield(last.number)
128 html << suffix if suffix
133 end # PaginationHelper