第十二章 Django框架——分页组件
一、Django的分页器Paginator
二、视图函数层Views
三、模板层Templates
四、补充
五、自己写逻辑实现分页
一、Django的分页器Paginator
如何使用分页器Paginator（how）：
导入模块
from django.core.paginator import Paginator
参数
Paginator对象： paginator = Paginator(user_list, 10)# per_page: 每页显示条目数量# count: 数据总个数# num_pages:总页数# page_range:总页数的索引范围，如: (1,10),(1,200)# page: page对象 page对象：page=paginator.page(1)# has_next 是否有下一页# next_page_number 下一页页码# has_previous 是否有上一页# previous_page_number 上一页页码# object_list 分页之后的数据列表# number 当前页# paginator paginator对象
二、视图函数层Views
from django.shortcuts import renderfrom django.core.paginator import Paginator, EmptyPage, PageNotAnIntegerL = []for i in range(999): L.append(i)def index(request): current_page = request.GET.get('p') paginator = Paginator(L, 10) # per_page: 每页显示条目数量 # count: 数据总个数 # num_pages:总页数 # page_range:总页数的索引范围，如: (1,10),(1,200) # page: page对象 try: posts = paginator.page(current_page) # has_next 是否有下一页 # next_page_number 下一页页码 # has_previous 是否有上一页 # previous_page_number 上一页页码 # object_list 分页之后的数据列表 # number 当前页 # paginator paginator对象 except PageNotAnInteger: posts = paginator.page(1) except EmptyPage: posts = paginator.page(paginator.num_pages) return render(request, 'index.html', { 'posts': posts})内置分页view部分
三、模板层Templates
- { % for item in posts %}
- { { item }} { % endfor %}
四、补充
''' 显示左5，右5，总共11个页，如果总页码大于11 1.1 if 当前页码减5小于1，要生成1到12的列表（顾头不顾尾，共11个页码） page_range=range(1,12) 1.2 elif 当前页码+5大于总页码，生成当前页码减10，到当前页码加1的列表（顾头不顾尾，共11个页码） page_range=range(paginator.num_pages-10,paginator.num_pages+1) 1.3 else 生成当前页码-5，到当前页码+6的列表 page_range=range(current_page_num-5,current_page_num+6)其它情况，生成的列表就是pageinator的page_range page_range=paginator.page_range '''
五、自己写逻辑实现分页（转自https://www.cnblogs.com/liwenzhou/p/8343243.html）
data = []for i in range(1, 302): tmp = { "id": i, "name": "alex-{}".format(i)} data.append(tmp)print(data)def user_list(request): # user_list = data[0:10] # user_list = data[10:20] try: current_page = int(request.GET.get("page")) except Exception as e: current_page = 1 per_page = 10 # 数据总条数 total_count = len(data) # 总页码 total_page, more = divmod(total_count, per_page) if more: total_page += 1 # 页面最多显示多少个页码 max_show = 11 half_show = int((max_show-1)/2) if current_page <= half_show: show_start = 1 show_end = max_show else: if current_page + half_show >= total_page: show_start = total_page - max_show show_end = total_page else: show_start = current_page - half_show show_end = current_page + half_show # 数据库中获取数据 data_start = (current_page - 1) * per_page data_end = current_page * per_page user_list = data[data_start:data_end] # 生成页面上显示的页码 page_html_list = [] # 加首页 first_li = ' class Pagination(object): def __init__(self, current_page, total_count, base_url, per_page=10, max_show=11): """ :param current_page: 当前页 :param total_count: 数据库中数据总数 :param per_page: 每页显示多少条数据 :param max_show: 最多显示多少页 """ try: current_page = int(current_page) except Exception as e: current_page = 1 self.current_page = current_page self.total_count = total_count self.base_url = base_url self.per_page = per_page self.max_show = max_show # 总页码 total_page, more = divmod(total_count, per_page) if more: total_page += 1 half_show = int((max_show - 1) / 2) self.half_show = half_show self.total_page = total_page @property def start(self): return (self.current_page - 1) * self.per_page @property def end(self): return self.current_page * self.per_page def page_html(self): if self.current_page <= self.half_show: show_start = 1 show_end = self.max_show else: if self.current_page + self.half_show >= self.total_page: show_start = self.total_page - self.max_show show_end = self.total_page else: show_start = self.current_page - self.half_show show_end = self.current_page + self.half_show # 生成页面上显示的页码 page_html_list = [] # 加首页 first_li = '
def user_list(request): pager = Pagination(request.GET.get("page"), len(data), request.path_info) user_list = data[pager.start:pager.end] page_html = pager.page_html() return render(request, "user_list.html", { "user_list": user_list, "page_html": page_html})