django -----分頁器組件
阿新 • • 發佈：2018-12-07
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- 1 Django的分頁器（paginator）簡介
- 2 應用View層
- 3 模版層 index.html
- 4 擴展
1 Django的分頁器（paginator）簡介
在頁面顯示分頁數據，需要用到Django分頁器組件
from django.core.paginator import Paginator
Paginator對象： paginator = Paginator(user_list, 10) # per_page: 每頁顯示條目數量 # count: 數據總個數 # num_pages:總頁數 # page_range:總頁數的索引範圍，如: (1,10),(1,200)# page: page對象 page對象：page=paginator.page(1) # has_next 是否有下一頁 # next_page_number 下一頁頁碼 # has_previous 是否有上一頁 # previous_page_number 上一頁頁碼 # object_list 分頁之後的數據列表 # number 當前頁 # paginator paginator對象
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2 應用View層
from django.shortcuts importrender,HttpResponse # Create your views here. from app01.models import * from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger def index(request): ‘‘‘ 批量導入數據: Booklist=[] for i in range(100): Booklist.append(Book(title="book"+str(i),price=30+i*i)) Book.objects.bulk_create(Booklist)‘‘‘ ‘‘‘ 分頁器的使用: book_list=Book.objects.all() paginator = Paginator(book_list, 10) print("count:",paginator.count) #數據總數 print("num_pages",paginator.num_pages) #總頁數 print("page_range",paginator.page_range) #頁碼的列表 page1=paginator.page(1) #第1頁的page對象 for i in page1: #遍歷第1頁的所有數據對象 print(i) print(page1.object_list) #第1頁的所有數據 page2=paginator.page(2) print(page2.has_next()) #是否有下一頁 print(page2.next_page_number()) #下一頁的頁碼 print(page2.has_previous()) #是否有上一頁 print(page2.previous_page_number()) #上一頁的頁碼 # 拋錯 #page=paginator.page(12) # error:EmptyPage #page=paginator.page("z") # error:PageNotAnInteger ‘‘‘ book_list=Book.objects.all() paginator = Paginator(book_list, 10) page = request.GET.get(‘page‘,1) currentPage=int(page) try: print(page) book_list = paginator.page(page) except PageNotAnInteger: book_list = paginator.page(1) except EmptyPage: book_list = paginator.page(paginator.num_pages) return render(request,"index.html",{"book_list":book_list,"paginator":paginator,"currentPage":currentPage})
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3 模版層 index.html
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous"> </head> <body> <div class="container"> <h4>分頁器</h4> <ul> {% for book in book_list %} <li>{{ book.title }} -----{{ book.price }}</li> {% endfor %} </ul> <ul class="pagination" id="pager"> {% if book_list.has_previous %} <li class="previous"><a href="/index/?page={{ book_list.previous_page_number }}">上一頁</a></li> {% else %} <li class="previous disabled"><a href="#">上一頁</a></li> {% endif %} {% for num in paginator.page_range %} {% if num == currentPage %} <li class="item active"><a href="/index/?page={{ num }}">{{ num }}</a></li> {% else %} <li class="item"><a href="/index/?page={{ num }}">{{ num }}</a></li> {% endif %} {% endfor %} {% if book_list.has_next %} <li class="next"><a href="/index/?page={{ book_list.next_page_number }}">下一頁</a></li> {% else %} <li class="next disabled"><a href="#">下一頁</a></li> {% endif %} </ul> </div> </body> </html>
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4 擴展
‘‘‘ 顯示左5，右5，總共11個頁， 1 如果總頁碼大於11 1.1 if 當前頁碼減5小於1，要生成1到12的列表（顧頭不顧尾，共11個頁碼） page_range=range(1,12) 1.2 elif 當前頁碼+5大於總頁碼，生成當前頁碼減10，到當前頁碼加1的列表（顧頭不顧尾，共11個頁碼） page_range=range(paginator.num_pages-10,paginator.num_pages+1) 1.3 else 生成當前頁碼-5，到當前頁碼+6的列表 page_range=range(current_page_num-5,current_page_num+6) 2 其它情況，生成的列表就是pageinator的page_range page_range=paginator.page_range ‘‘‘核心邏輯
def index(request): book_list=Book.objects.all() paginator = Paginator(book_list, 15) page = request.GET.get(‘page‘,1) currentPage=int(page) # 如果頁數十分多時，換另外一種顯示方式
if paginator.num_pages>11: if currentPage-5<1: pageRange=range(1,11) elif currentPage+5>paginator.num_pages: pageRange=range(currentPage-5,paginator.num_pages+1) else: pageRange=range(currentPage-5,currentPage+5) else: pageRange=paginator.page_range try: print(page) book_list = paginator.page(page) except PageNotAnInteger: book_list = paginator.page(1) except EmptyPage: book_list = paginator.page(paginator.num_pages) return render(request,"index.html",locals())
def page_test(request): # book_list=[] # for i in range(100): # book=Book(name=‘book%s‘%i,price=10+i,pub_date=‘2018-09-18‘,publish_id=1) # book_list.append(book) # Book.objects.bulk_create(book_list,10) book_list=Book.objects.all() # 生成paginator對象，傳入書籍列表，每頁10條數據 paginator=Paginator(book_list,3) # 總頁碼數 print(paginator.num_pages) # 頁碼列表 print(paginator.page_range) # 總數據 print(paginator.count) # 獲取頁面傳來的頁碼 current_page=int(request.GET.get(‘page‘,1)) page_range=[] # 左5 右5 # 獲取頁面傳來的頁碼的page對象 try: page=paginator.page(current_page) # print(page.has_next()) #是否有下一頁 # print(page.next_page_number()) #下一頁的頁碼 # print(page.has_previous()) #是否有上一頁 # print(page.previous_page_number()) #上一頁的頁碼 # 循環打印出當頁對象 for i in page: print(i) except Exception as e: current_page=1 page = paginator.page(1) if paginator.num_pages>11: if current_page+5>paginator.num_pages: page_range=range(paginator.num_pages-10,paginator.num_pages+1) elif current_page-5<1: page_range=range(1,12) else: page_range=range(current_page-5,current_page+6) else: page_range=paginator.page_range return render(request,‘page_test.html‘,locals())views
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <link rel="stylesheet" href="/static/bootstrap-3.3.7-dist/css/bootstrap.min.css"> <title>Title</title> </head> <body> <ul> {% for foo in page %} <li>{{ foo.name }}</li> {% endfor %} </ul> <nav aria-label="Page navigation"> <ul class="pagination"> {% if page.has_previous %} <li> <a href="/page_test/?page={{ page.previous_page_number }}" aria-label="Previous"> <span aria-hidden="true">上一頁</span> </a> </li> {% else %} <li class="disabled"> <a href="#" aria-label="Previous"> <span aria-hidden="true">上一頁</span> </a> </li> {% endif %} {% for foo in page_range %} {% if current_page == foo %} <li class="active"><a href="/page_test/?page={{ foo }}">{{ foo }}</a></li> {% else %} <li><a href="/page_test/?page={{ foo }}">{{ foo }}</a></li> {% endif %} {% endfor %} {% if page.has_next %} <li> <a href="/page_test/?page={{ page.next_page_number }}" aria-label="Next"> <span aria-hidden="true">下一頁</span> </a> </li> {% else %} <li class="disabled"> <a href="#" aria-label="Next"> <span aria-hidden="true">下一頁</span> </a> </li> {% endif %} </ul> </nav> </body> </html>模版
---------https://www.cnblogs.com/liuqingzheng/articles/9509767.html
django -----分頁器組件