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一个分页效果ruby版可作为面试题吧

2010-11-19 19:52 281 查看

#coding:utf-8total_pages=11current_page=10a=(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 ar=[]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 endendif a.first!=1 a.unshift "..." a.unshift 1endif a.last!=total_pages a<<"..." a<<total_pagesendputs 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 ...14 15 161718 下一页尾页»17/共18页
«首页上一页 1 ...14 15 16 1718下一页尾页»18/共18页
«首页上一页12 3 4 5 ...18 下一页尾页»1/共18页
«首页上一页 1 2 345 6 ...18 下一页尾页»4/共18页
«首页上一页 1 ...4 567 8 ...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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