will_paginate是Rails中比较常用的分页插件,但是有时候我们可能想要自定义它的输出,这可以通过扩展WillPaginate::LinkRenderer类来实现,比如,下面的renderer将会去除Next和Previous链接(来自这里):
class?CustomPaginationRenderer?<?WillPaginate::LinkRenderer
??def?to_html
????links?=?@options[:page_links]???windowed_links?:?[] ? ?
????html?=?links.join(@options[:separator])
????@options[:container]???@template.content_tag(:div,?html,?html_attributes)?:?html
??end ?
end
要在view中使用这个自定义的renderer,只需要加上:renderer参数即可:
<%=?will_paginate?@items,?:renderer?=>?'CustomPaginationRenderer'?%>
下面给出一个更复杂的自定义Renderer,它会在分页链接后显示一个文本框,以及一个‘Goto’按钮,允许用户直接跳转到某一页:
class?CustomPaginationRenderer?< WillPaginate::LinkRenderer
??@@id = 1
??def to_html
????links = @options[:page_links] ? windowed_links : []
????# previous/next buttons
????links.unshift page_link_or_span(@collection.previous_page, 'disabled', @options[:prev_label])
????links.push ? ?page_link_or_span(@collection.next_page, ? ? 'disabled', @options[:next_label])
????html = links.join(@options[:separator])
????html += goto_box
????@options[:container] ? @template.content_tag(:div, html, html_attributes) : html
??end
??private
??def goto_box
????@@id += 1
????@@id = 1 if @@id > 100
??<<-GOTO
????<input type="text" maxlength="5" size="3" id="page#{@@id}" />
????<input type="submit" onclick="goto_page#{@@id}()" value="Goto"/>
????<script type="text/javascript">
??????function goto_page#{@@id}()
??????{
????????page = Number($('page#{@@id}').value)
????????total = #{total_pages}
????????if(page < 1 || page > total)
????????{
??????????alert('Please enter a number between 1 and ' + total + '!')
??????????return;
????????}
????????var link = '#{@template.url_for(url_options("_page"))}'
????????var new_link = link.replace("_page", page)
????????window.location.assign(new_link)
??????}
????</script>
????GOTO
??end
end
@@id的作用是因为一个view中有可能多次调用will_paginate,需要对inputbox进行区分,这个renderer还用到了一些继承自WillPaginate::LinkRenderer的方法:
更多方法可以在WillPaginate的view_helper.rb中找到。