Django分頁器(paginator)組件
阿新 • • 發佈:2018-11-21
插入 lin str 文件 row next 頁碼 ice nta
Django分頁器(paginator)組件
from django.core.paginator import Paginator
from django.core.paginator import Paginator 先拿到分頁器對象 paginator = Paginator(book_list,3) 第一個參數:對象列表,第二個參數:每頁顯示的條數 paginator.count 總條數 paginator.num_pages 總頁數 paginator.page_range 頁碼數列表 current_page= paginator.page(5) 取某一頁,返回一個對象 current_page.object_list 某一頁裏所有數據,例如:這是第5也所有數據 current_page.has_next() 是否有下一頁 current_page.has_previous() 是否有上一頁 current_page.next_page_number() 下一頁的頁碼數 current_page,previous_page_number() 上一頁的頁碼數
分頁器邏輯分析
(1)批量插入 bulk_create li= [] for i in range(100): li.append(models.Book(name=‘圖書%s‘%i,price=10+i)) models.Book.objects.bulk_create(li) (2)分頁器分析: 先前臺傳過來哪一頁,後臺取哪一頁 current_page = paginator.page(5) 前臺可以循環當前頁的對象 paginator.page 也可以循環當前頁的內容 current_page.object_list 可以直接渲染出哪一頁的頁面內容 頁碼數分析:最大頁數小於<11,就顯示最大頁數 最大頁數大於11時,再判斷我取的頁數 如果我取的頁數 小於 5 則 paginator.page_range 頁碼數列表 為 paginator.page_range(1,12) 如果我取的頁數 大於 最大頁數 則 paginator.page_range(paginator.num_pages-11,paginator.num_pages+1) 其他 則 get 發過來的頁碼數 +5 和 -5 current_range = range(current_page_num-5, current_page_num-5)
views 視圖層
from django.core.paginator import Paginator def index(request): book_list = models.Book.objects.all() paginator = Paginator(book_list,3) 對所有數據進行分頁 # page_range = paginator.page_range # 頁碼數列表 # print(page_range) try: # 捕捉前臺傳過來的數據,傳過來不正常的數據都跳到第一頁 current_page_num = int(request.GET.get(‘page‘)) # 前臺傳過來的要拿一頁 current_page = paginator.page(current_page_num) # 拿哪一頁 print(current_page.object_list) # 拿哪一頁的所有數據 # # 這可以循環當前頁的對象 paginator.page 也可以循環當前頁的內容 current_page.object_list # # for item in current_page: # # print(item.name) # if paginator.num_pages > 11: # 判斷總頁數是否大於 11 頁 if current_page_num -5 < 1: current_range = range(1,12) elif current_page_num + 5 > paginator.num_pages: current_range = range(paginator.num_pages-10, paginator.num_pages+1) else: current_range = range(current_page_num-5, current_page_num-5) else:page_range = paginator.page_range # except Exception as e: current_page_num = 1 current_page = paginator.page(current_page_num) current_range = range(1, 12) return render(request, ‘index.html‘, locals())
Html文件 模板層
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <link rel="stylesheet" href="/static/bootstrap-3.3.7-dist/css/bootstrap.css"> <script src="/static/jquery-3.3.1.js"></script> <title>圖書列表</title> </head> <body> <div class="container-fluid"> <div class="row"> <div class="col-md-6 col-md-offset-3"> <table class="table table-hover"> <thead> <tr> <th>書名</th> <th>價格</th> </tr> </thead> <tbody> {% for book in current_page %} <tr> <td>{{ book.name }}</td> <td>價格{{ book.price }}</td> </tr> {% endfor %} </tbody> </table> <div> <nav aria-label="Page navigation"> <ul class="pagination"> {% if current_page.has_previous %} <li> <a href="/index/?page={{ current_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 %} {# 拿到頁碼書總列表 #} {% for item in page_range %} {% if current_page_num == item %} <li class="active"><a href="/index/?page={{ item }}">{{ item }}</a></li> {% else %} <li><a href="/index/?page={{ item }}">{{ item }}</a></li> {% endif %} {% endfor %} {% if current_page.has_next %} <li> <a href="/index/?page={{ current_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="Previous"> <span aria-hidden="true">下一頁</span> </a> </li> {% endif %} </ul> </nav> </div> </div> </div> </div> </body> </html>
Django分頁器(paginator)組件