135 lines
5.9 KiB
Ruby
135 lines
5.9 KiB
Ruby
module ActionView
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module Helpers
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# Provides methods for linking to ActionController::Pagination objects using a simple generator API. You can optionally
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# also build your links manually using ActionView::Helpers::AssetHelper#link_to like so:
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#
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# <%= link_to "Previous page", { :page => paginator.current.previous } if paginator.current.previous %>
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# <%= link_to "Next page", { :page => paginator.current.next } if paginator.current.next %>
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module PaginationHelper
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unless const_defined?(:DEFAULT_OPTIONS)
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DEFAULT_OPTIONS = {
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:name => :page,
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:window_size => 2,
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:always_show_anchors => true,
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:link_to_current_page => false,
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:params => {}
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}
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end
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# Creates a basic HTML link bar for the given +paginator+. Links will be created
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# for the next and/or previous page and for a number of other pages around the current
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# pages position. The +html_options+ hash is passed to +link_to+ when the links are created.
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#
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# ==== Options
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# <tt>:name</tt>:: the routing name for this paginator
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# (defaults to +page+)
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# <tt>:prefix</tt>:: prefix for pagination links
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# (i.e. Older Pages: 1 2 3 4)
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# <tt>:suffix</tt>:: suffix for pagination links
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# (i.e. 1 2 3 4 <- Older Pages)
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# <tt>:window_size</tt>:: the number of pages to show around
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# the current page (defaults to <tt>2</tt>)
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# <tt>:always_show_anchors</tt>:: whether or not the first and last
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# pages should always be shown
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# (defaults to +true+)
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# <tt>:link_to_current_page</tt>:: whether or not the current page
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# should be linked to (defaults to
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# +false+)
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# <tt>:params</tt>:: any additional routing parameters
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# for page URLs
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#
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# ==== Examples
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# # We'll assume we have a paginator setup in @person_pages...
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#
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# pagination_links(@person_pages)
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# # => 1 <a href="/?page=2/">2</a> <a href="/?page=3/">3</a> ... <a href="/?page=10/">10</a>
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#
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# pagination_links(@person_pages, :link_to_current_page => true)
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# # => <a href="/?page=1/">1</a> <a href="/?page=2/">2</a> <a href="/?page=3/">3</a> ... <a href="/?page=10/">10</a>
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#
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# pagination_links(@person_pages, :always_show_anchors => false)
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# # => 1 <a href="/?page=2/">2</a> <a href="/?page=3/">3</a>
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#
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# pagination_links(@person_pages, :window_size => 1)
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# # => 1 <a href="/?page=2/">2</a> ... <a href="/?page=10/">10</a>
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#
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# pagination_links(@person_pages, :params => { :viewer => "flash" })
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# # => 1 <a href="/?page=2&viewer=flash/">2</a> <a href="/?page=3&viewer=flash/">3</a> ...
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# # <a href="/?page=10&viewer=flash/">10</a>
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def pagination_links(paginator, options={}, html_options={})
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name = options[:name] || DEFAULT_OPTIONS[:name]
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params = (options[:params] || DEFAULT_OPTIONS[:params]).clone
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prefix = options[:prefix] || ''
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suffix = options[:suffix] || ''
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pagination_links_each(paginator, options, prefix, suffix) do |n|
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params[name] = n
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link_to(n.to_s, params, html_options)
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end
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end
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# Iterate through the pages of a given +paginator+, invoking a
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# block for each page number that needs to be rendered as a link.
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#
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# ==== Options
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# <tt>:window_size</tt>:: the number of pages to show around
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# the current page (defaults to +2+)
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# <tt>:always_show_anchors</tt>:: whether or not the first and last
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# pages should always be shown
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# (defaults to +true+)
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# <tt>:link_to_current_page</tt>:: whether or not the current page
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# should be linked to (defaults to
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# +false+)
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#
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# ==== Example
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# # Turn paginated links into an Ajax call
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# pagination_links_each(paginator, page_options) do |link|
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# options = { :url => {:action => 'list'}, :update => 'results' }
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# html_options = { :href => url_for(:action => 'list') }
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#
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# link_to_remote(link.to_s, options, html_options)
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# end
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def pagination_links_each(paginator, options, prefix = nil, suffix = nil)
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options = DEFAULT_OPTIONS.merge(options)
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link_to_current_page = options[:link_to_current_page]
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always_show_anchors = options[:always_show_anchors]
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current_page = paginator.current_page
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window_pages = current_page.window(options[:window_size]).pages
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return if window_pages.length <= 1 unless link_to_current_page
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first, last = paginator.first, paginator.last
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html = ''
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html << prefix if prefix
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if always_show_anchors and not (wp_first = window_pages[0]).first?
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html << yield(first.number)
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html << ' ... ' if wp_first.number - first.number > 1
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html << ' '
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end
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window_pages.each do |page|
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if current_page == page && !link_to_current_page
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html << page.number.to_s
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else
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html << yield(page.number)
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end
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html << ' '
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end
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if always_show_anchors and not (wp_last = window_pages[-1]).last?
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html << ' ... ' if last.number - wp_last.number > 1
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html << yield(last.number)
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end
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html << suffix if suffix
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html
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end
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end # PaginationHelper
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end # Helpers
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end # ActionView
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