Django - 分页器
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Django - 分页器
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一.分頁器：
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知識點先覽
Paginator：Django分頁器bulk_create：批量插入數(shù)據(jù)
paginator.count：數(shù)據(jù)總數(shù)，其中paginator是分頁器實例化對象
paginator.num_pages：總頁數(shù)
paginator.page_range：頁碼的列表
object_list：分頁之后的數(shù)據(jù)列表
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
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models.py
from django.db import models# Create your models here.class Book(models.Model):title = models.CharField(max_length=32)price = models.DecimalField(max_digits=8,decimal_places=2)?
views.py
# -*- encoding:utf-8 -*- from django.shortcuts import render# Create your views here. from app01.models import Bookfrom django.core.paginator import Paginator,EmptyPage # 導(dǎo)入分頁器def index(request):# 方法不好，每次都要插入數(shù)據(jù)，需要插入100次# for i in range(100):# Book.objects.create(title="book_%s"%i,price=i*i)# 批量插入，導(dǎo)入到數(shù)據(jù)庫里 bulk_create'''book_list = []for i in range(100):book_obj = Book(title="book_%s"%i,price=i*i)book_list.append(book_obj)Book.objects.bulk_create(book_list)'''book_list = Book.objects.all() # 拿到所有書籍?dāng)?shù)據(jù)# 分頁器paginator = Paginator(book_list,8) # 第一個參數(shù)是需要分頁的列表，第二個是每頁需要展示的數(shù)目print(paginator.count) # 數(shù)據(jù)總數(shù)print(paginator.num_pages) # 總頁數(shù)print(paginator.page_range) # 頁碼的列表,總頁數(shù)+1# 100# 13# range(1, 14) page1 = paginator.page(1) # 第一頁的page對象,固定死了# 動態(tài)顯示try:current_page_num = int(request.GET.get("page", 1)) # get數(shù)據(jù)是通過?連接的 http://127.0.0.1:8000/index/?page=2#做成一個動態(tài)的效果。給它個默認(rèn)值拿第一頁，不加1就會返回一個None。當(dāng)前想要的第幾頁的數(shù)據(jù) current_page = paginator.page(current_page_num) # 拿到第幾頁的page對象# 顯示每一頁具體數(shù)據(jù)的兩種方式print("object_list",page1.object_list)# object_list < QuerySet[ < Book: Book object (1) >, < Book: Book object (2) >, < Book: Book object (3) >,# < Book: Book object (4) >, < Book: Book object (5) >, < Book: Book object (6) >, < Book: Book object (7) >,# < Book: Book object (8) >] >for i in page1:print(i)# Book object (1)# Book object (2)# Book object (3)# Book object (4)# Book object (5)# Book object (6)# Book object (7)# Book object (8)except EmptyPage as e:current_page = paginator.page(1)return render(request,"index.html",locals())?
index.html
<!DOCTYPE html> <html lang="en"> <head><meta charset="UTF-8"><title>Title</title><!-- 最新版本的 Bootstrap 核心 CSS 文件 --><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"> </head> <body><p3>index</p3>{# 顯示當(dāng)前頁面的書籍信息 #}<ul>{% for book in current_page %}<li>{{ book.title }}:{{ book.price }}</li>{% endfor %}</ul><nav aria-label="Page navigation"> // 分頁的頁面<ul class="pagination">{# 無法顯示上一頁和下一頁 #} {# <li>#} {# <a href="?page={{ current_page_num|add:-1 }}" aria-label="Previous">#} // 上一頁：當(dāng)前頁碼減一 --> href="?page={{current_page_num|add:-1}}" {# <span aria-hidden="true">上一頁</span>#} {# </a>#} {# </li>#}{% if current_page.has_previous %} // 判斷當(dāng)前頁面是否還有上一頁<li><a href="?page={{ current_page.previous_page_number }}" aria-label="Previous"> // 獲得當(dāng)前頁面上一頁的頁碼<span aria-hidden="true">上一頁</span></a></li>{% else %}<li class="disabled"> {# bootstrap設(shè)置disabled 不能點擊#} // 上一頁沒數(shù)據(jù)就不能點擊<a href="#" aria-label="Previous"><span aria-hidden="true">上一頁</span></a></li>{% endif %}{% for item in paginator.page_range %} // item為數(shù)字，這里不應(yīng)該寫死 --> page_range{#{% for item in page_range %}#}{% if current_page_num == item %} {# 判斷當(dāng)前頁碼是否和循環(huán)的頁碼一致 bootstrap設(shè)置的active會顯示深色， #}<li class="active"><a href="?page={{ item }}">{{ item }}</a></li>{% else %}<li><a href="?page={{ item }}">{{ item }}</a></li>{% endif %}{% endfor %}{# <li>#} {# <a href="?page={{ current_page_num|add:1 }}" aria-label="Next">#} {# <span aria-hidden="true">下一頁</span>#} {# </a>#} {# </li>#}{% if current_page.has_next %} // 判斷當(dāng)前頁面是否還有下一頁<li><a href="?page={{ current_page.next_page_number }}" aria-label="Next"> // 獲得下一頁頁面的頁碼<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></body> </html>?
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改進版：
views.py
# -*- encoding:utf-8 -*- from django.shortcuts import render# Create your views here. from app01.models import Bookfrom django.core.paginator import Paginator,EmptyPage # 導(dǎo)入分頁器def index(request):# 方法不好，每次都要插入數(shù)據(jù)，需要插入100次# for i in range(100):# Book.objects.create(title="book_%s"%i,price=i*i)# 批量插入 bulk_create'''book_list = []for i in range(100):book_obj = Book(title="book_%s"%i,price=i*i)book_list.append(book_obj)Book.objects.bulk_create(book_list)'''book_list = Book.objects.all()# 分頁器paginator = Paginator(book_list,3) # 第一個參數(shù)是需要分頁的列表，第二個是每頁需要展示的數(shù)目print(paginator.count) # 數(shù)據(jù)總數(shù)print(paginator.num_pages) # 總頁數(shù)print(paginator.page_range) # 頁碼的列表,總頁數(shù)+1# 100# 13# range(1, 14) page1 = paginator.page(1) # 第一頁的page對象,固定死了# 動態(tài)顯示 current_page_num = int(request.GET.get("page", 1)) # get數(shù)據(jù)是通過?連接的 http://127.0.0.1:8000/index/?page=2# 固定頁碼數(shù)居中if paginator.num_pages > 11:if current_page_num - 5 < 1: ## 點1,2,3,4,5,6頁碼不動，點7開始左五右五，點倒數(shù)五個頁面不動page_range = range(1,12)elif current_page_num + 6 > paginator.num_pages:page_range = range(paginator.num_pages-10,paginator.num_pages+1)else:page_range = range(current_page_num-5,current_page_num+6)else:page_range = paginator.page_rangetry:current_page = paginator.page(current_page_num)# 顯示每一頁具體數(shù)據(jù)的兩種方式print("object_list",page1.object_list)# object_list < QuerySet[ < Book: Book object (1) >, < Book: Book object (2) >, < Book: Book object (3) >,# < Book: Book object (4) >, < Book: Book object (5) >, < Book: Book object (6) >, < Book: Book object (7) >,# < Book: Book object (8) >] >for i in page1:print(i)# Book object (1)# Book object (2)# Book object (3)# Book object (4)# Book object (5)# Book object (6)# Book object (7)# Book object (8)except EmptyPage as e:current_page = paginator.page(1)return render(request,"index.html",locals())?
index,html
{% for item in page_range %} 不應(yīng)該寫死，其他同上{% if current_page_num == item %}<li class="active"><a href="?page={{ item }}">{{ item }}</a></li>{% else %}<li><a href="?page={{ item }}">{{ item }}</a></li>{% endif %}{% endfor %}轉(zhuǎn)載于:https://www.cnblogs.com/mumupa0824/p/10361854.html
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