标段o&ŧ039;数据寻呼机
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This function (intended to be an application or view helper) creates a pager bar useful for navigating many pages. It shows the first, last, current, nearby, and halfway-to-end pages. It looks like this (where the current page is 11):< 1 ... 5 ... 10 11 12 ... 14 15 >
The pagerBar function takes two parameters: a RoR paginator, and an anchor that will be attached to all the links.
class ActionController::AbstractRequest def get_post_params self.parameters.reject {|k,v| k == 'controller' || k == 'action'} end end def pagerBar(paginator, anchor) page = paginator.current_page; pageParam = 'page'; firstPage = 1; lastPage = paginator.page_count; prevStr = 'â†'; nextStr = '→'; elideStr = '… '; # Include trailing space. pageSpan = 3; # How many pages to the left and right of current. # The central group of pages. window = page.window(pageSpan); windowFirst = window.first.number; windowLast = window.last.number; # These define the halfway pages. prevHalfway = (windowFirst / 2.0).floor; prevHalfway = 2 if prevHalfway == 1; nextHalfway = ((windowLast + lastPage) / 2.0).ceil; nextHalfway = lastPage - 1 if nextHalfway == lastPage; # Need to show first/last pages separate from range? showFirst = (windowFirst > 1); showLast = (windowLast < lastPage); # Need to show half-way pages? showPrevHalfway = (prevHalfway > 1 && prevHalfway < windowFirst); showNextHalfway = (nextHalfway < lastPage && nextHalfway > windowLast); # Pages missing before/after half-way pages? elideBeforePrevHalf = (showPrevHalfway && (prevHalfway - firstPage) > 1); elideAfterPrevHalf = (showPrevHalfway && (windowFirst - prevHalfway) > 1); elideBeforeNextHalf = (showNextHalfway && (nextHalfway - windowLast) > 1); elideAfterNextHalf = (showNextHalfway && (lastPage - nextHalfway) > 1); # No half-way pages, but pages missing before/after range? elideBeforeRange = (!showPrevHalfway && (windowFirst - firstPage) > 1); elideAfterRange = (!showNextHalfway && (lastPage - windowLast) > 1); # Do prev arrow. request.get_post_params.merge( { pageParam => page.previous, :anchor => anchor })); html += ' '; # Do first page. if (showFirst) html += link_to(paginator.first_page.number.to_s, request.get_post_params.merge( { pageParam => paginator.first_page.number, :anchor => anchor })); html += ' '; end # Do prev halfway point. html += elideStr if elideBeforePrevHalf; if (showPrevHalfway) html += link_to(paginator[prevHalfway].number.to_s, request.get_post_params.merge( { pageParam => paginator[prevHalfway].number, :anchor => anchor })); html += ' '; end html += elideStr if elideAfterPrevHalf; # Do range. html += elideStr if elideBeforeRange; window.pages.each do |windowPage| html += link_to_unless (page == windowPage, windowPage.number.to_s, request.get_post_params.merge( { pageParam => windowPage.number, :anchor => anchor })); html += ' '; end html += elideStr if elideAfterRange; # Do next halfway point. html += elideStr if elideBeforeNextHalf; if (showNextHalfway) html += link_to(paginator[nextHalfway].number.to_s, request.get_post_params.merge( { pageParam => paginator[nextHalfway].number, :anchor => anchor })); html += ' '; end html += elideStr if elideAfterNextHalf; # Do last page. if (showLast) html += link_to(paginator.last_page.number.to_s, request.get_post_params.merge( { pageParam => paginator.last_page.number, :anchor => anchor })); html += ' '; end # Do next arrow. html += link_to_unless(page.last?, nextStr, request.get_post_params.merge( { pageParam => page.next, :anchor => anchor })); # Return html end
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