1.在页面显示分页数据，需要用到Django分页器组件
导入Paginator
from django.core.paginator import Paginator
1 Paginator对象： paginator = Paginator(user_list, 10) 2 # per_page: 每页显示条目数量 3 # count: 数据总个数 4 # num_pages:总页数 5 # page_range:总页数的索引范围，如: (1,10),(1,200) 6 # page: page对象 7 page对象：page=paginator.page(1) 8 # has_next 是否有下一页 9 # next_page_number 下一页页码 10 # has_previous 是否有上一页 11 # previous_page_number 上一页页码 12 # object_list 分页之后的数据列表 13 # number 当前页 14 # paginator paginator对象
Django的分页器
view.py
1 from django.shortcuts import render,HttpResponse 2 3 # Create your views here. 4 from app01.models import * 5 from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger 6 7 def index(request): 8 9 ''' 10 批量导入数据: 11 12 Booklist=[] 13 for i in range(100): 14 Booklist.append(Book(title="book"+str(i),price=30+i*i)) 15 Book.objects.bulk_create(Booklist) 16 ''' 17 18 ''' 19 分页器的使用: 20 21 book_list=Book.objects.all() 22 23 paginator = Paginator(book_list, 10) 24 25 print("count:",paginator.count) #数据总数 26 print("num_pages",paginator.num_pages) #总页数 27 print("page_range",paginator.page_range) #页码的列表 28 29 30 31 page1=paginator.page(1) #第1页的page对象 32 for i in page1: #遍历第1页的所有数据对象 33 print(i) 34 35 print(page1.object_list) #第1页的所有数据 36 37 38 page2=paginator.page(2) 39 40 print(page2.has_next()) #是否有下一页 41 print(page2.next_page_number()) #下一页的页码 42 print(page2.has_previous()) #是否有上一页 43 print(page2.previous_page_number()) #上一页的页码 44 45 46 47 # 抛错 48 #page=paginator.page(12) # error:EmptyPage 49 50 #page=paginator.page("z") # error:PageNotAnInteger 51 52 ''' 53 54 55 book_list=Book.objects.all() 56 57 paginator = Paginator(book_list, 10) 58 page = request.GET.get('page',1) 59 currentPage=int(page) 60 61 62 try: 63 print(page) 64 book_list = paginator.page(page) 65 except PageNotAnInteger: 66 book_list = paginator.page(1) 67 except EmptyPage: 68 book_list = paginator.page(paginator.num_pages) 69 70 71 return render(request,"index.html",{"book_list":book_list,"paginator":paginator,"currentPage":currentPage})
view.py 部分注释
1 def chakanbook(request): 2 ''' 3 批量导入 4 Booklist = [] 5 for i in range(100): 6 7 Booklist.append(models.Book(title="book" + str(i), price=20 + i * i)) 8 9 models.Book.objects.bulk_create(Booklist) 10 11 :param request: 12 :return: 13 ''' 14 book_list = models.Book.objects.all()# book_list打印的是一个对象 先查看所有的书 15 paginator=Paginator(book_list,5) #这里的book_list必须是一个集合对象，把所有的书分页，一页有五个 16 print(paginator.page_range) #range(1, 4) 17 num = request.GET.get("page",2)#得到页数范围,默认有1页 18 print(num,type(num)) 19 book_list = paginator.page(num) #显示第一页的内容 20 return render(request,"chakan.html",{"book_list":book_list,"page_range":page_range,"num":int(num),"paginator":paginator})
index.html
1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4 <meta charset="UTF-8"> 5 <title>Title</title> 6 <link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" 7 integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous"> 8 </head> 9 <body> 10 11 <div class="container"> 12 13 <h4>分页器</h4> 14 <ul> 15 16 {% for book in book_list %} 17 <li>{{ book.title }} -----{{ book.price }}</li> 18 {% endfor %} 19 20 </ul> 21 22 23 <ul class="pagination" id="pager"> 24 25 {% if book_list.has_previous %} 26 <li class="previous"><a href="/index/?page={{ book_list.previous_page_number }}">上一页</a></li> 27 {% else %} 28 <li class="previous disabled"><a href="#">上一页</a></li> 29 {% endif %} 30 31 32 {% for num in paginator.page_range %} 33 34 {% if num == currentPage %} 35 <li class="item active"><a href="/index/?page={{ num }}">{{ num }}</a></li> 36 {% else %} 37 <li class="item"><a href="/index/?page={{ num }}">{{ num }}</a></li> 38 39 {% endif %} 40 {% endfor %} 41 42 43 44 {% if book_list.has_next %} 45 <li class="next"><a href="/index/?page={{ book_list.next_page_number }}">下一页</a></li> 46 {% else %} 47 <li class="next disabled"><a href="#">下一页</a></li> 48 {% endif %} 49 50 </ul> 51 </div> 52 53 54 55 </body> 56 </html>
拓展
1 def index(request): 2 3 4 book_list=Book.objects.all() 5 6 paginator = Paginator(book_list, 15) 7 page = request.GET.get('page',1) 8 currentPage=int(page) 9 10 # 如果页数十分多时，换另外一种显示方式 11 if paginator.num_pages>30: 12 13 if currentPage-5<1: 14 pageRange=range(1,11) 15 elif currentPage+5>paginator.num_pages: 16 pageRange=range(currentPage-5,paginator.num_pages+1) 17 18 else: 19 pageRange=range(currentPage-5,currentPage+5) 20 21 else: 22 pageRange=paginator.page_range 23 24 25 try: 26 print(page) 27 book_list = paginator.page(page) 28 except PageNotAnInteger: 29 book_list = paginator.page(1) 30 except EmptyPage: 31 book_list = paginator.page(paginator.num_pages) 32 33 34 return render(request,"index.html",locals())
自定义分页组件的使用方法
1 class Pagination(object): 2 """ 3 自定义分页 4 """ 5 def __init__(self,current_page,total_count,base_url,params,per_page_count=10,max_pager_count=11): 6 try: 7 current_page = int(current_page) 8 except Exception as e: 9 current_page = 1 10 if current_page <=0: 11 current_page = 1 12 self.current_page = current_page 13 # 数据总条数 14 self.total_count = total_count 15 16 # 每页显示10条数据 17 self.per_page_count = per_page_count 18 19 # 页面上应该显示的最大页码 20 max_page_num, div = divmod(total_count, per_page_count) 21 if div: 22 max_page_num += 1 23 self.max_page_num = max_page_num 24 25 # 页面上默认显示11个页码（当前页在中间） 26 self.max_pager_count = max_pager_count 27 self.half_max_pager_count = int((max_pager_count - 1) / 2) 28 29 # URL前缀 30 self.base_url = base_url 31 32 # request.GET 33 import copy 34 params = copy.deepcopy(params) 35 params._mutable = True 36 # 包含当前列表页面所有的搜索条件 37 # {source:[2,], status:[2], gender:[2],consultant:[1],page:[1]} 38 # self.params[page] = 8 39 # self.params.urlencode() 40 # source=2&status=2&gender=2&consultant=1&page=8 41 # href="/hosts/?source=2&status=2&gender=2&consultant=1&page=8" 42 # href="%s?%s" %(self.base_url,self.params.urlencode()) 43 self.params = params 44 45 @property 46 def start(self): 47 return (self.current_page - 1) * self.per_page_count 48 49 @property 50 def end(self): 51 return self.current_page * self.per_page_count 52 53 def page_html(self): 54 # 如果总页数 <= 11 55 if self.max_page_num <= self.max_pager_count: 56 pager_start = 1 57 pager_end = self.max_page_num 58 # 如果总页数 > 11 59 else: 60 # 如果当前页 <= 5 61 if self.current_page <= self.half_max_pager_count: 62 pager_start = 1 63 pager_end = self.max_pager_count 64 else: 65 # 当前页 + 5 > 总页码 66 if (self.current_page + self.half_max_pager_count) > self.max_page_num: 67 pager_end = self.max_page_num 68 pager_start = self.max_page_num - self.max_pager_count + 1 #倒这数11个 69 else: 70 pager_start = self.current_page - self.half_max_pager_count 71 pager_end = self.current_page + self.half_max_pager_count 72 73 page_html_list = [] 74 # {source:[2,], status:[2], gender:[2],consultant:[1],page:[1]} 75 # 首页 76 self.params['page'] = 1 77 first_page = '<li><a href="%s?%s">首页</a></li>' % (self.base_url,self.params.urlencode(),) 78 page_html_list.append(first_page) 79 80 # 上一页 81 self.params["page"] = self.current_page - 1 82 if self.params["page"] < 1: 83 pervious_page = '<li class="disabled"><a href="%s?%s" aria-label="Previous">上一页</span></a></li>' % ( 84 self.base_url, self.params.urlencode()) 85 else: 86 pervious_page = '<li><a href = "%s?%s" aria-label = "Previous" >上一页</span></a></li>' % ( 87 self.base_url, self.params.urlencode()) 88 page_html_list.append(pervious_page) 89 90 # 中间页码 91 for i in range(pager_start, pager_end + 1): 92 self.params['page'] = i 93 if i == self.current_page: 94 temp = '<li class="active"><a href="%s?%s">%s</a></li>' % (self.base_url,self.params.urlencode(), i,) 95 else: 96 temp = '<li><a href="%s?%s">%s</a></li>' % (self.base_url,self.params.urlencode(), i,) 97 page_html_list.append(temp) 98 99 # 下一页 100 self.params["page"] = self.current_page + 1 101 if self.params["page"] > self.max_page_num: 102 self.params["page"] = self.current_page 103 next_page = '<li class="disabled"><a href = "%s?%s" aria-label = "Next">下一页</span></a></li >' % ( 104 self.base_url, self.params.urlencode()) 105 else: 106 next_page = '<li><a href = "%s?%s" aria-label = "Next">下一页</span></a></li>' % ( 107 self.base_url, self.params.urlencode()) 108 page_html_list.append(next_page) 109 110 # 尾页 111 self.params['page'] = self.max_page_num 112 last_page = '<li><a href="%s?%s">尾页</a></li>' % (self.base_url, self.params.urlencode(),) 113 page_html_list.append(last_page) 114 115 return ''.join(page_html_list)
1 """ 2 自定义分页组件的使用方法： 3 pager_obj = Pagination(request.GET.get('page',1),len(HOST_LIST),request.path_info,request.GET) 4 host_list = HOST_LIST[pager_obj.start:pager_obj.end] 5 html = pager_obj.page_html() 6 return render(request,'hosts.html',{'host_list':host_list,"page_html":html}) 7 """
批量查数据
1 #批量创建数据 2 # booklist = [] 3 # for i in range(100): 4 # booklist.append(models.Book(name="book" + str(i), price=20 + i * i)) 5 # 6 # models.Book.objects.bulk_create(booklist)