分页,在做WEB开发的时候一定会遇到的,可是webpy却没有内置的分布类,只有自己动手写一个简单的分页类。本文,就以webpy(实际只是python的功能)为便,实现一个简单的分页类…
如何分页
以前,经常将分页与DB混在一起,比如以下的PHP代码:
<?php$page = get_current_page();$start = $page*$step;$article_list = $db->all('select * from `xxx` limit $start,$step;');$total = $db->get('select count(*) as `total` form `xxx`;');//...pagination...
这样的分页明显是不科学的。
分页应该注意的事项
- 分页类不应与混淆在一起
- 分页类不应与界面混淆在一起
- 分页类应该独立,在任何情况下都可以使用
为了满足以上的三个条件,就设计了一个简单的分页类(只做示例,应用到项目需要优化代码和严格的检查)
分页类
分页类代码
class ProbbsPage: def __init__(self, total, per = 10): self.total = total self.per = per self.url = '' self.page = 1 def set_url(self,url): self.url = url return self def set_page(self,page): self.page = int(page) return self def show(self): if self.total%self.per == 0: pages = self.total/self.per else: pages = self.total/self.per+1 if self.page < 6: limit_s = 1 else: limit_s = self.page if pages < (limit_s+10): limit_e = pages else: limit_e = limit_s+10 pagination = '<span>%s/%s pages </span>'%(self.page,pages) for i in range(limit_s,limit_e+1): if i == self.page: pagination += '<a class="cur" href="javascript:void(0);">%s</a>'%(i,) else: pagination += '<a href="%s">%s</a>'%(self.url%i,i) return pagination
分页类调用示例
pagination =ProbbsPage(总页数,每页数)url = 'your_page?page=%s';page_html = pagination.set_url(url).set_page(page).show()print page_html#就可以显示出#<span>当前页/共几页</span>#<a>页页链接</a>
分类页可以优化的地方
set_url可以自动根据url进行提取,前提是使用“?页面参数=第几页”等常用的形成(像我使用专门的不期然形式就不可以了)
set_page同上,可以自动从url中上提取
如果做到以上的两步,就可以直接 ProbbsPage(总页数,每页数).show()就可以了,相对来说比较方便
文章来源:http://pjiaxu.com/python/48.html
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波比源码 » webpy实现分页功能的方法
波比源码 » webpy实现分页功能的方法
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