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day 96 关于分页的使用

發布時間：2024/4/15 编程问答 29 豆豆

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分頁的學習主要四步驟

from django.db import models# Create your models here.class Book(models.Model):title = models.CharField(max_length=43)price = models.DecimalField(max_digits=9, decimal_places=3)

一批量創建數據庫測試

from django.shortcuts import render,HttpResponsefrom .models import *def add(request):book_list = []for i in range(1000):obj = Book(title="book-%s" % i, price=i*12)book_list.append(obj)Book.objects.bulk_create(book_list)return HttpResponse("添加成功")

二分頁的引用文件

class Pagination(object):def __init__(self,current_page,all_count,base_url,params,per_page_num=30,pager_count=11,):"""封裝分頁相關數據:param current_page: 當前頁:param all_count: 數據庫中的數據總條數:param per_page_num: 每頁顯示的數據條數:param base_url: 分頁中顯示的URL前綴:param pager_count: 最多顯示的頁碼個數"""try:current_page = int(current_page)except Exception as e:current_page = 1if current_page <1:current_page = 1self.current_page = current_pageself.all_count = all_countself.per_page_num = per_page_numself.base_url = base_url# 總頁碼all_pager, tmp = divmod(all_count, per_page_num)if tmp:all_pager += 1self.all_pager = all_pagerself.pager_count = pager_countself.pager_count_half = int((pager_count - 1) / 2)self.params=params # {"id":1,"title":"python","page":109}--->"id=1&title=python&page=109"# 頁碼的開始每頁顯示11條，當前頁是2 從11開始（2-1）*11 = 11@propertydef start(self):return (self.current_page - 1) * self.per_page_num# 頁碼的結束當前頁是2 從 2*11 = 22 根據索引取值到21@propertydef end(self):return self.current_page * self.per_page_num# 頁碼的頁面、def page_html(self):# 如果總頁碼 < 11個：if self.all_pager <= self.pager_count:pager_start = 1pager_end = self.all_pager + 1# 總頁碼 > 11else:# 當前頁如果<=頁面上最多顯示(11-1)/2個頁碼if self.current_page <= self.pager_count_half:pager_start = 1pager_end = self.pager_count + 1# 當前頁大于5else:# 頁碼翻到最后if (self.current_page + self.pager_count_half) > self.all_pager:pager_start = self.all_pager - self.pager_count + 1pager_end = self.all_pager + 1else:pager_start = self.current_page - self.pager_count_halfpager_end = self.current_page + self.pager_count_half + 1page_html_list = []first_page = '<li><a href="%s?page=%s">首頁</a></li>' % (self.base_url,1,)page_html_list.append(first_page)if self.current_page <= 1:prev_page = '<li class="disabled"><a href="#">上一頁</a></li>'else:prev_page = '<li><a href="%s?page=%s">上一頁</a></li>' % (self.base_url,self.current_page - 1,)page_html_list.append(prev_page)for i in range(pager_start, pager_end):if i == self.current_page:temp = '<li class="active"><a href="%s?page=%s">%s</a></li>' % (self.base_url,i, i,)else:temp = '<li><a href="%s?page=%s">%s</a></li>' % (self.base_url,i,i,)page_html_list.append(temp)if self.current_page >= self.all_pager:next_page = '<li class="disabled"><a href="#">下一頁</a></li>'else:next_page = '<li><a href="%s?page=%s">下一頁</a></li>' % (self.base_url,self.current_page + 1,)page_html_list.append(next_page)last_page = '<li><a href="%s?page=%s">尾頁</a></li>' % (self.base_url,self.all_pager,)page_html_list.append(last_page)return ''.join(page_html_list)

三定義頁面引用分頁到此

def index(request):# 一分頁的部分主要從數據庫取出類里面的變量的6 個參數 1當前的頁碼 2 數據總數 3 url# 4 get傳參數的后綴 5每頁顯示數據條數 6每頁顯示多少頁碼# 類的規格形參def __init__(self,current_page,all_count,base_url,params,per_page_num=8,pager_count=11,):page_num = request.GET.get("page", 1) # ? #?????? url的參數 get 傳參數如果url 中是page=22,jprint("page_num", page_num) # 點擊分頁的多少就是多少book_list = Book.objects.all()total_count = Book.objects.all().count()base_url = request.path_infoparams = request.GET #?????? url的參數 get 傳參數 http://127.0.0.1:8000/index/?page=11print("params",params)# QueryDict: {'page': ['11']} >from .utils.page import Paginationpage = Pagination(page_num, total_count, base_url, params, per_page_num=40, pager_count=11)page_html = page.page_html() # ??????對頁面的開始渲染# 二數據的部分book_list = book_list[page.start:page.end] #??????return render(request, "index.html", locals())

四頁面展示

<!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>{% for book in book_list %}<li>{{ book.title }}----{{ book.price }}</li> {% endfor %}<nav aria-label="Page navigation"><ul class="pagination">{{ page_html|safe}}</ul></nav></body> </html>

轉載于:https://www.cnblogs.com/xiaoluoboer/p/8576707.html

總結

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