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module ActionView
module Helpers
# Provides methods for linking to ActionController::Pagination objects.
#
# You can also build your links manually, like in this example:
#
# <%= link_to "Previous page", { :page => paginator.current.previous } if paginator.current.previous %>
#
# <%= link_to "Next page", { :page => paginator.current.next } if paginator.current.next =%>
module PaginationHelper
unless const_defined?(:DEFAULT_OPTIONS)
DEFAULT_OPTIONS = {
:name => :page,
:window_size => 2,
:always_show_anchors => true,
:link_to_current_page => false,
:params => {}
}
end
# Creates a basic HTML link bar for the given +paginator+.
# +html_options+ are passed to +link_to+.
#
# +options+ are:
# <tt>:name</tt>:: the routing name for this paginator
# (defaults to +page+)
# <tt>:window_size</tt>:: the number of pages to show around
# the current page (defaults to +2+)
# <tt>:always_show_anchors</tt>:: whether or not the first and last
# pages should always be shown
# (defaults to +true+)
# <tt>:link_to_current_page</tt>:: whether or not the current page
# should be linked to (defaults to
# +false+)
# <tt>:params</tt>:: any additional routing parameters
# for page URLs
def pagination_links(paginator, options={}, html_options={})
name = options[:name] || DEFAULT_OPTIONS[:name]
params = (options[:params] || DEFAULT_OPTIONS[:params]).clone
pagination_links_each(paginator, options) do |n|
params[name] = n
link_to(n.to_s, params, html_options)
end
end
# Iterate through the pages of a given +paginator+, invoking a
# block for each page number that needs to be rendered as a link.
def pagination_links_each(paginator, options)
options = DEFAULT_OPTIONS.merge(options)
link_to_current_page = options[:link_to_current_page]
always_show_anchors = options[:always_show_anchors]
current_page = paginator.current_page
window_pages = current_page.window(options[:window_size]).pages
return if window_pages.length <= 1 unless link_to_current_page
first, last = paginator.first, paginator.last
html = ''
if always_show_anchors and not (wp_first = window_pages[0]).first?
html << yield(first.number)
html << ' ... ' if wp_first.number - first.number > 1
html << ' '
end
window_pages.each do |page|
if current_page == page && !link_to_current_page
html << page.number.to_s
else
html << yield(page.number)
end
html << ' '
end
if always_show_anchors and not (wp_last = window_pages[-1]).last?
html << ' ... ' if last.number - wp_last.number > 1
html << yield(last.number)
end
html
end
end # PaginationHelper
end # Helpers
end # ActionView
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