分页（二）自定义分页分页（二）自定义分页

一、自定义分页遵守的

当前页，当前页可能会被传入特别的值建议异常就是第一页
底栏展示页码
数据总个数用来计算生成多少页
每页展示页数

逻辑

首先我们利用切片，把数据分成段落显示，每一页的第一条数据是（当前页-1）*页面显示条数

@property def start(self): ''' :return: 开始页数 ''' return (self.current_page-1)*self.page_count

每页最后一条数据是（当前页*显示条数）

@property def end(self): ''' :return: 结束页数 ''' return (self.current_page*self.page_count)

页面的总页数是总条数/页面显示页数

@property def total_count(self): ''' :return: 总页数 ''' v, y = divmod(self.data_count,self.page_count) if y: v +=1 return v

页面展示的条数也就是循环次数
当总页数小于页面实际展示页数时，开始页1，结束页实际页数
当总页数大于页面实际展示页数时
第一种情况当前页小于中间页，开始页1，结束页是页面展示底栏
第二种情况当前页大于中间页，开始页当前页-（中间页-1）/2，结束页（当前页+1）/2
当然第二种的前提建立在（当前页+（中间页-1）/2）大于总页数
开始页总页数-底栏数-1，结束页等于总页数+1

_author__ = 'Administrator' from django.utils.safestring import mark_safeclass Pagination(object): def __init__(self, current_page, data_count, per_page_count=1, pager_num=7): try: self.current_page = int(current_page) except Exception as e: self.current_page = 1 self.data_count = data_count self.per_page_count = per_page_count self.pager_num = pager_num@property def start(self): return (self.current_page - 1) * self.per_page_count@property def end(self): return self.current_page * self.per_page_count@property def total_count(self): v, y = divmod(self.data_count, self.per_page_count) if y: v += 1 return vdef page_str(self, base_url): page_list = []if self.total_count < self.pager_num: start_index = 1 end_index = self.total_count + 1 else: if self.current_page <= (self.pager_num + 1) / 2: start_index = 1 end_index = self.pager_num + 1 else: start_index = self.current_page - (self.pager_num - 1) / 2 end_index = self.current_page + (self.pager_num + 1) / 2 if (self.current_page + (self.pager_num - 1) / 2) > self.total_count: end_index = self.total_count + 1 start_index = self.total_count - self.pager_num + 1if self.current_page == 1: prev = '上一页' else: prev = '上一页' % (base_url, self.current_page - 1,) page_list.append(prev)for i in range(int(start_index), int(end_index)): if i == self.current_page: temp = '%s' % (base_url, i, i) else: temp = '%s' % (base_url, i, i) page_list.append(temp)if self.current_page == self.total_count: nex = '下一页' else: nex = '下一页' % (base_url, self.current_page + 1,) page_list.append(nex)# jump = """ # GO # # """ % (base_url,) # # page_list.append(jump)page_str = mark_safe("".join(page_list))return page_str