1.
通过切片控制分页
自定义分页:
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1 from django.shortcuts import render 2 3 # Create your views here. 4 5 6 from app01.models import Book 7 from django.core.paginator import Paginator,EmptyPage 8 def index(request): 9 10 ''' 11 12 批量插入数据: 13 # for i in range(100): 14 # Book.objects.create(title="book_%s"%i,price=i*i) 15 16 17 book_list=[] 18 19 for i in range(100): 20 book=Book(title="book_%s"%i,price=i*i) 21 book_list.append(book) 22 23 Book.objects.bulk_create(book_list) 24 25 26 27 分页器的使用: 28 paginator=Paginator(book_list,8) 29 30 print(paginator.count) # 100 31 print(paginator.num_pages) # 分页数:13 32 print(paginator.page_range) # range(1, 14) 33 34 page=paginator.page(5) 35 for i in page: 36 print(i) 37 38 print(page.has_next()) 39 print(page.has_previous()) 40 print(page.next_page_number()) 41 print(page.previous_page_number()) 42 43 44 45 book_list = Book.objects.all() 46 paginator = Paginator(book_list, 2) 47 try: 48 49 current_page_num=request.GET.get("page",1) 50 current_page=paginator.page(current_page_num) 51 except EmptyPage as e: 52 current_page_num=1 53 current_page = paginator.page(1) 54 55 ''' 56 # 自定义分页 57 58 print(request.GET) 59 60 61 from app01.page import Pagination 62 current_page_num = request.GET.get("page") 63 book_list = Book.objects.all() 64 pagination=Pagination(current_page_num,book_list.count(),request) 65 ''' 66 67 count=100 68 per_page=9 69 70 current_page_num=1 start 0 end 8 71 current_page_num=2 start 8 end 16 72 current_page_num=3 start 16 end 24 73 current_page_num=n start (n-1)*per_page end n*per_page 74 75 ''' 76 book_list=book_list[pagination.start:pagination.end] 77 78 return render(request,"index.html",locals())
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1 """ 2 分页组件使用示例: 3 4 obj = Pagination(request.GET.get('page',1),len(USER_LIST),request.path_info) 5 page_user_list = USER_LIST[obj.start:obj.end] 6 page_html = obj.page_html() 7 8 return render(request,'index.html',{'users':page_user_list,'page_html':page_html}) 9 10 11 12 13 """ 14 15 class Pagination(object): 16 17 def __init__(self,current_page_num,all_count,request,per_page_num=2,pager_count=11): 18 """ 19 封装分页相关数据 20 :param current_page_num: 当前访问页的数字 21 :param all_count: 分页数据中的数据总条数 22 :param per_page_num: 每页显示的数据条数 23 :param pager_count: 最多显示的页码个数 24 """ 25 try: 26 current_page_num = int(current_page_num) 27 except Exception as e: 28 current_page_num = 1 29 30 if current_page_num <1: 31 current_page_num = 1 32 33 self.current_page_num = current_page_num 34 35 self.all_count = all_count 36 self.per_page_num = per_page_num 37 38 # 实际总页码 39 all_pager, tmp = divmod(all_count, per_page_num) 40 if tmp: 41 all_pager += 1 42 self.all_pager = all_pager 43 44 45 self.pager_count = pager_count 46 self.pager_count_half = int((pager_count - 1) / 2) # 5 47 48 49 # 保存搜索条件 50 51 import copy 52 self.params=copy.deepcopy(request.GET) # {"a":"1","b":"2"} 53 54 @property 55 def start(self): 56 return (self.current_page_num - 1) * self.per_page_num 57 58 @property 59 def end(self): 60 return self.current_page_num * self.per_page_num 61 62 def page_html(self): 63 # 如果总页码 < 11个: 64 if self.all_pager <= self.pager_count: 65 pager_start = 1 66 pager_end = self.all_pager + 1 67 # 总页码 > 11 68 else: 69 # 当前页如果<=页面上最多显示11/2个页码 70 if self.current_page_num <= self.pager_count_half: 71 pager_start = 1 72 pager_end = self.pager_count + 1#尾页是固定的 73 # 当前页大于5 74 else: 75 # 页码翻到最后 76 if (self.current_page_num + self.pager_count_half) > self.all_pager: 77 78 pager_start = self.all_pager - self.pager_count + 1 79 pager_end = self.all_pager + 1#尾页是固定的 80 81 else: 82 pager_start = self.current_page_num - self.pager_count_half#+5 -5 83 pager_end = self.current_page_num + self.pager_count_half + 1 84 85 page_html_list = [] 86 87 first_page = '<li><a href="?page=%s">首页</a></li>' % (1,) 88 page_html_list.append(first_page) 89 90 if self.current_page_num <= 1: 91 prev_page = '<li class="disabled"><a href="#">上一页</a></li>' 92 else: 93 prev_page = '<li><a href="?page=%s">上一页</a></li>' % (self.current_page_num - 1,) 94 95 page_html_list.append(prev_page) 96 97 98 #self.params=copy.deepcopy(request.GET) # {"a":"1","b":"2"} 99 100 for i in range(pager_start, pager_end): 101 #照道理来说,深拷贝是不可以添加或修改的,但是这里是可以的 102 #在返回的请求中通过添加page间而进行定位 103 104 self.params["page"]=i 105 106 if i == self.current_page_num: 107 temp = '<li class="active"><a href="?%s">%s</a></li>' %(self.params.urlencode(),i) 108 else: 109 temp = '<li><a href="?%s">%s</a></li>' % (self.params.urlencode(),i,) 110 page_html_list.append(temp) 111 112 113 114 115 116 117 118 119 if self.current_page_num >= self.all_pager: 120 next_page = '<li class="disabled"><a href="#">下一页</a></li>' 121 else: 122 next_page = '<li><a href="?page=%s">下一页</a></li>' % (self.current_page_num + 1,) 123 page_html_list.append(next_page) 124 last_page = '<li><a href="?page=%s">尾页</a></li>' % (self.all_pager,) 125 page_html_list.append(last_page) 126 127 return ''.join(page_html_list)
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1 <!DOCTYPE html> 2 <html lang="zh-CN"> 3 <head> 4 <meta charset="UTF-8"> 5 <title>Title</title> 6 <meta name="viewport" content="width=device-width, initial-scale=1"> 7 <!-- 最新版本的 Bootstrap 核心 CSS 文件 --> 8 <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous"> 9 </head> 10 <body> 11 12 <ul> 13 {% for book in book_list %} 14 <li>{{ book.title }} ---- {{ book.price }}</li> 15 {% endfor %} 16 </ul> 17 18 <nav aria-label="Page navigation"> 19 <ul class="pagination"> 20 {{ pagination.page_html|safe }}...... 21 </ul> 22 </nav> 23 24 25 </body> 26 </html>
2.
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1 FBV-----function based view 2 CBV-----class based view 3 4 path('index/', views.index), 5 path('login/', views.LoginView.as_view()), 6 path('login/', View.as_view.view) 7 # 用户访问get请求/login/-----------view(request) 8 9 def view(request): 10 self = cls(**initkwargs) 11 return self.dispatch(request, *args, **kwargs) 12 13 def dispatch(request, *args, **kwargs): 14 if request.method.lower() in self.http_method_names: 15 handler = getattr(self, request.method.lower(), self.http_method_not_allowed) 16 else: 17 handler = self.http_method_not_allowed 18 return handler(request, *args, **kwargs) 19
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1 from django.contrib import admin 2 from django.urls import path 3 4 from app01 import views 5 6 urlpatterns = [ 7 path('admin/', admin.site.urls), 8 path('login/', views.LoginView.as_view()), 9 ]
过程, as_view-- def view -- def dispatch --进行校验,返回