一个分页效果ruby版可作为面试题吧

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一个分页效果ruby版可作为面试题吧

#coding:utf-8
total_pages=11
current_page=10
a=(1..total_pages).to_a
 #<div class="page_box">«首页上一页
#1
#<a href="" >2</a>
#<a href="" >3</a>
#<a href="" >4</a>
#<a href="" >5</a>
#<a href="" >...</a>
#<a href="" >11</a>
#<a href="">下一页</a>
#<a href="" >尾页»</a>
#1/共11页
#</div>
#r=[]
#if current_page-5>0
# r<<"1"
# r<<"..."+(current_page-3).to_s
# r<<current_page-2
# r<<current_page-1
# r<<current_page
# if current_page+1<=total_pages
# r<<current_page+1
# end
# if current_page+2<==total_pages
# r<<current_page+2
# end
#else
# r.concat((1...current_page).to_a)
#end
#r<<current_page
#if current_page+5<=total_pages
# r<<current_page+1
# r<<current_page+2
# r<<"..."+(current_page+3).to_s
#else
# r.concat(((current_page+1)..total_pages).to_a)
#end
#
#
#
#puts r
#r=[]
#r<<current_page
#if current_page-2>0
# r.unshift current_page-1
#
#end
#if current_page-5>0 and current_page+2<=total_pages
# a[1..
#end
#puts a
r=[]
if total_pages<=6
 r.concat((1..total_pages).to_a)
else
 if current_page-5>0
 if current_page+2<=total_pages
 a.delete_if{|x| x< current_page-2}
 elsif current_page+1<=total_pages
 a.delete_if{|x| x<current_page-3}
 elsif current_page<=total_pages
 a.delete_if{|x| x<current_page-4}
 end
 end
 if current_page+5>0
 if current_page-2>0
 a.delete_if{|x| x >current_page+2}
 elsif current_page-1>0
 a.delete_if{|x| x>current_page+3}
 elsif current_page>0
 a.delete_if{|x| x>current_page+4}
 end
 end
end
if a.first!=1
 a.unshift "..."
 a.unshift 1
end
if a.last!=total_pages
 a<<"..."
 a<<total_pages
end
puts a
我也是费了好久，快要penkui了，可以看到注释的部分我也是很糊，另外也有对ruby的函数不熟悉，（这个是借口，主要是脑子不好使）
效果参见ecshop的分页效果，
实现如下效果
«首页上一页1...1415161718下一页尾页»17/共18页

«首页上一页1...1415161718下一页尾页»18/共18页

«首页上一页12345...18下一页尾页»1/共18页

«首页上一页123456...18下一页尾页»4/共18页

«首页上一页1...45678...18下一页尾页»6/共18页

«首页上一页1下一页尾页»1/共1页
之前blog有一篇有python写的分页，比这个简单，可以算是这个的子集
最终的代码
#coding:utf-8
total_pages=11
current_page=10
a=(1..total_pages).to_a
 #<div class="page_box">«首页上一页
#1
#<a href="" >2</a>
#<a href="" >3</a>
#<a href="" >4</a>
#<a href="" >5</a>
#<a href="" >...</a>
#<a href="" >11</a>
#<a href="">下一页</a>
#<a href="" >尾页»</a>
#1/共11页
#</div>
#r=[]
#if current_page-5>0
# r<<"1"
# r<<"..."+(current_page-3).to_s
# r<<current_page-2
# r<<current_page-1
# r<<current_page
# if current_page+1<=total_pages
# r<<current_page+1
# end
# if current_page+2<==total_pages
# r<<current_page+2
# end
#else
# r.concat((1...current_page).to_a)
#end
#r<<current_page
#if current_page+5<=total_pages
# r<<current_page+1
# r<<current_page+2
# r<<"..."+(current_page+3).to_s
#else
# r.concat(((current_page+1)..total_pages).to_a)
#end
#
#
#
#puts r
#r=[]
#r<<current_page
#if current_page-2>0
# r.unshift current_page-1
#
#end
#if current_page-5>0 and current_page+2<=total_pages
# a[1..
#end
#puts a
if total_pages>6
 if current_page-5>0
 if current_page+2<=total_pages
 a.delete_if{|x| x< current_page-2}
 elsif current_page+1<=total_pages
 a.delete_if{|x| x<current_page-3}
 elsif current_page<=total_pages
 a.delete_if{|x| x<current_page-4}
 end
 end
 if current_page+5>0
 if current_page-2>0
 a.delete_if{|x| x >current_page+2}
 elsif current_page-1>0
 a.delete_if{|x| x>current_page+3}
 elsif current_page>0
 a.delete_if{|x| x>current_page+4}
 end
 end
end
if a.first!=1
 a.unshift "..."
 a.unshift 1
end
if a.last!=total_pages
 a<<"..."
 a<<total_pages
end
puts a
puts "----------"
pos=a.index(current_page)
def gen_link(page)
 page=page.to_s
 #拼接样式输出
 %Q{<a href="">#{page}</a>}
end
r=[]
a.each_with_index do |elem,index|
 page=elem
 if elem=="..." and index<pos
 page=a[a.index("...")+1]-1
 end
 if elem=="..." and index>pos
 page=a[a.rindex("...")-1]+1
 end
 r<<gen_link(page)
end
#修改当前页的样式
r[pos]=%Q{#{a[pos]}}
if current_page==1
 r.unshift %q{上一页}
 r.unshift %q{«首页}
 r.unshift %q{<div class="page_box">}
else
 page=current_page-1
 r.unshift %Q{<a href="">上一页</a>}
 r.unshift %Q{<a href="">首页</a>}
 r.unshift %q{<div class="page_box">}
end
if current_page==total_pages
 r<<%q{<a href="">下一页</a>}
 r<<%q{<a href="" >尾页»</a>}
 r<<%q{1/共11页}
 r<<%q{</div>}
else
 page=current_page+1
 r<< %Q{<a href="">下一页</a>}
 r<< %Q{<a href="">尾页»</a>}
 r<<%q{</div>}
end
puts r
puts r.join("")

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原文地址：https://www.cnblogs.com/lexus/p/1882140.html