Django分页组件
1.设计思路
根据每页显示数据量对数据进行切片显示。根据/index.html?p=4用GET方法获取页码
1 def index(request): 2 per_page_count=10 3 current_page=request.GET.get('p') 4 current_page=int(current_page) 5 start=(current_page-1)*per_page_count 6 end=current_page*per_page_count 7 data=USER_LIST[start:end] 8 9 if current_page<=1: 10 prev_page=1 11 next_page = current_page + 1 12 else: 13 prev_page=current_page-1 14 next_page=current_page+1 15 return render(request,"index.html",{'user_list':data,'prev_page':prev_page,'next_page':next_page})
1 <body> 2 <ul> 3 {% for row in user_list %} 4 <li>{{ row.name }}-{{ row.age }}</li> 5 {% endfor %} 6 </ul> 7 <a href="/index.html?p={{ prev_page }}">上一页</a> 8 <a href="/index.html?p={{ next_page }}">下一页</a> 9 </body>
2.Django原生分页组件
Django封装的两个对象Paginator和page对象，通过输入的参数对数据进行处理得到各种属性，且两个对象互相包含。
Paginator对象 参数有全部数据的数组，以及每页显示条目数量,函数内部封装了对象的各项属性
# 全部数据：USER_LIST，=》得出共有多少条数据
# 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（是否具有下一页；是否有上一页；）
Page对象 参数为当前的页码
# 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，已经切片好的数据
# number 当前页
# paginator paginator对象
from django.core.paginator import Paginator,EmptyPage,PageNotAnInteger
1 def index1(request): 2 current_page=request.GET.get('p') 3 paginator=Paginator(USER_LIST, 10) 4 try: 5 posts=paginator.page(current_page) 6 except PageNotAnInteger: 7 posts=paginator.page(1) 8 except EmptyPage: 9 posts=paginator.page(paginator.num_pages) 10 return render(request,"index1.html",{"posts":posts})
1 <ul> 2 {% for row in posts.object_list %} 3 <li>{{ row.name }}-{{ row.age }}</li> 4 {% endfor %} 5 </ul> 6 {% if posts.has_previous %} 7 <a href="/index1.html?p={{ posts.previous_page_number }}">上一页</a> 8 {% else %} 9 <a href="#">上一页</a> 10 {% endif %} 11 {% for i in posts.paginator.pager_num_range %} 12 {% if i == posts.number %} 13 <a style="font-size: 30px;" href="/index1.html?p={{ i }}">{{ i }}</a> 14 {% else %} 15 <a href="/index1.html?p={{ i }}">{{ i }}</a> 16 {% endif %} 17 {% endfor %} 18 {% if posts.has_next %} 19 <a href="/index1.html?p={{ posts.next_page_number }}">下一页</a> 20 {% endif %} 21 <span> 22 {{ posts.number }}/{{ posts.paginator.num_pages }} 23 </span>
3.自定义分页组件
通过继承原生分页组件自定制分页功能
1 class CustomPaginator(Paginator): 2 def __init__(self,current_page, per_pager_num,*args,**kwargs): 3 # 当前页 4 self.current_page = int(current_page) 5 # 最多显示的页码数量 11 6 self.per_pager_num = int(per_pager_num) 7 super(CustomPaginator,self).__init__(*args,**kwargs) 8 def pager_num_range(self): 9 # 当前页 10 #self.current_page 11 # 最多显示的页码数量 11 12 #self.per_pager_num 13 # 总页数 14 # self.num_pages 15 if self.num_pages < self.per_pager_num: 16 return range(1,self.num_pages+1) 17 # 总页数特别多 5 18 part = int(self.per_pager_num/2) 19 if self.current_page <= part: 20 return range(1,self.per_pager_num+1) 21 if (self.current_page + part) > self.num_pages: 22 return range(self.num_pages-self.per_pager_num+1,self.num_pages+1) 23 return range(self.current_page-part,self.current_page+part+1)
效果如下：
上一页 1 2 3 4 5 6 7 8 9 10 11 下一页 6/100
4.bootstrap自定制样式
1 {#bootstrap自定制样式#} 2 <nav aria-label="Page navigation"> 3 <ul class="pagination"> 4 <li> 5 {% if posts.has_previous %} 6 <a href="/index1.html?p={{ posts.previous_page_number }}" aria-label="Previous"> 7 <span aria-hidden="true">«</span> 8 </a> 9 {% else %} 10 <a href="#" aria-label="Previous"> 11 <span aria-hidden="true">«</span> 12 </a> 13 {% endif %} 14 </li> 15 {% for i in posts.paginator.pager_num_range %} 16 {% if i == posts.number %} 17 <li class="active"><a href="/index1.html?p={{ i }}">{{ i }}</a></li> 18 {% else %} 19 <li><a href="/index1.html?p={{ i }}">{{ i }}</a></li> 20 {% endif %} 21 {% endfor %} 22 <li> 23 <a href="/index1.html?p={{ posts.next_page_number }}" aria-label="Next"> 24 <span aria-hidden="true">»</span> 25 </a> 26 </li> 27 </ul> 28 </nav>
5.完全脱离Django内置模块的自写分页组件
1 class Pagination(object): 2 def __init__(self,totalCount,currentPage,perPageItemNum=10,maxPageNum=7): 3 # 数据总个数 4 self.total_count = totalCount 5 # 当前页 6 try: 7 v = int(currentPage) 8 if v <= 0: 9 v = 1 10 self.current_page = v 11 except Exception as e: 12 self.current_page = 1 13 # 每页显示的行数 14 self.per_page_item_num = perPageItemNum 15 # 最多显示页面 16 self.max_page_num = maxPageNum 17 18 def start(self): 19 return (self.current_page-1) * self.per_page_item_num 20 21 def end(self): 22 return self.current_page * self.per_page_item_num 23 @property 24 def num_pages(self): 25 """ 26 总页数 27 :return: 28 """ 29 # 666 30 # 10 31 a,b = divmod(self.total_count,self.per_page_item_num) 32 if b == 0: 33 return a 34 return a+1 35 36 def pager_num_range(self): 37 # self.num_pages() 38 # self.num_pages 39 # 当前页 40 #self.current_page 41 # 最多显示的页码数量 11 42 #self.per_pager_num 43 # 总页数 44 # self.num_pages 45 if self.num_pages < self.max_page_num: 46 return range(1,self.num_pages+1) 47 # 总页数特别多 5 48 part = int(self.max_page_num/2) 49 if self.current_page <= part: 50 return range(1,self.max_page_num+1) 51 if (self.current_page + part) > self.num_pages: 52 return range(self.num_pages-self.max_page_num+1,self.num_pages+1) 53 return range(self.current_page-part,self.current_page+part+1) 54 55 def page_str(self): 56 page_list = [] 57 58 first = "<li><a href='/index2.html?p=1'>首页</a></li>" 59 page_list.append(first) 60 61 if self.current_page == 1: 62 prev = "<li><a href='#'>上一页</a></li>" 63 else: 64 prev = "<li><a href='/index2.html?p=%s'>上一页</a></li>" %(self.current_page-1,) 65 page_list.append(prev) 66 for i in self.pager_num_range(): 67 if i == self.current_page: 68 temp = "<li class='active'><a href='/index2.html?p=%s'>%s</a></li>" %(i,i) 69 else: 70 temp = "<li><a href='/index2.html?p=%s'>%s</a></li>" % (i, i) 71 page_list.append(temp) 72 73 if self.current_page == self.num_pages: 74 nex = "<li><a href='#'>下一页</a></li>" 75 else: 76 nex = "<li><a href='/index2.html?p=%s'>下一页</a></li>" % (self.current_page + 1,) 77 page_list.append(nex) 78 79 last = "<li><a href='/index2.html?p=%s'>尾页</a></li>" %(self.num_pages,) 80 page_list.append(last) 81 82 return ''.join(page_list)
适用于各种框架
