1 Django的分页器(paginator)简介
在页面显示分页数据，需要用到Django分页器组件
from django.core.paginator import Paginator
Paginator对象： paginator = Paginator(user_list, 10) # per_page: 每页显示条目数量 # count: 数据总个数 # num_pages:总页数 # page_range:总页数的索引范围，如: (1,10),(1,200) # page: page对象 page对象：page=paginator.page(1) # has_next 是否有下一页 # next_page_number 下一页页码 # has_previous 是否有上一页 # previous_page_number 上一页页码 # object_list 分页之后的数据列表 # number 当前页 # paginator paginator对象
# 你们 写: # for i in range(100): # models.Book.objects.create(name='图书%s'%i,price=10+i) # 我写和以后你们写(批量插入) # 先造成100本书,放到列表中 # ll=[] # for i in range(100): # ll.append(models.Book(name='图书%s'%i,price=10+i)) # # 批量插入,两个参数,第一个是对象列表,第二个是一次插入的数据量,不填,默认一次全插入 # models.Book.objects.bulk_create(ll) # 查询所有图书 book_list=models.Book.objects.all() # 分页器--类 # 实例化产生一个对象 # 两个参数:object_list:对象列表, per_page:每页显示的条数 paginator=Paginator(book_list,10) # 对象内的属性 # 数据总条数100条 # print(paginator.count) # # 总页数 10页 # print(paginator.num_pages) # # 页码数的列表 # print(paginator.page_range) # # 取到第 x 页 ,返回一个Page对象 # current_page=paginator.page(5) # # 当前页码内所有的数据 # print(current_page.object_list) # # 是否有下一页 # print(current_page.has_next()) # # 是否有上一页 # print(current_page.has_previous()) # # 下一页页码数 # print(current_page.next_page_number()) # # 上一页的页码数 # print(current_page.previous_page_number())
2 应用View层
def index(request): book_list = models.Book.objects.all() paginator = Paginator(book_list, 3) # 如果页码数多,让它显示前5,后5,中间是当前在的页码 try: current_page_num = int(request.GET.get('page')) current_page = paginator.page(current_page_num) print(current_page.object_list) # 总页码数,大于11的时候 if paginator.num_pages >11: # 当前页码数-5大于1的时候,page_range应该是? if current_page_num-5<1: page_range=range(1,12) elif current_page_num+5>paginator.num_pages: #当前页码数+5大于总页码数,总页码数往前推11个 page_range=range(paginator.num_pages-10,paginator.num_pages+1) else: page_range = range(current_page_num - 5, current_page_num + 6) else: #小于11,有多少页,就显示多少页 page_range=paginator.page_range except Exception as e: current_page_num = 1 current_page = paginator.page(current_page_num) return render(request, 'index_next.html', locals())
3 模版层 index.html
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <!-- 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"> <title>Title</title> </head> <body> <div class="row"> <div class="col-md-6 col-md-offset-3"> <table class="table table-striped"> <thead> <tr> <th>书名</th> <th>价格</th> </tr> </thead> <tbody> {% for book in current_page %} <tr> <td>{{ book.name }}</td> <td>{{ book.price }}</td> </tr> {% endfor %} </tbody> </table> <nav aria-label="Page navigation"> <ul class="pagination"> {% if current_page.has_previous %} <li> {# <a href="/index/?page={{ current_page_num|add:-1 }}" aria-label="Previous">#} <a href="/index/?page={{ current_page.previous_page_number }}" aria-label="Previous"> <span aria-hidden="true">上一页</span> </a> </li> {% else %} <li class="disabled"> <a href="" aria-label="Previous"> <span aria-hidden="true">上一页</span> </a> </li> {% endif %} {% for foo in page_range %} {% if current_page_num == foo %} {# 当前页码等于循环到的页码数,变色#} <li class="active"><a href="/index/?page={{ foo }}">{{ foo }}</a></li> {% else %} <li><a href="?page={{ foo }}">{{ foo }}</a></li> {% endif %} {% endfor %} {% if current_page.has_next %} <li> {# <a href="/index/?page={{ current_page_num|add:1 }}" aria-label="Next">#} <a href="/index/?page={{ current_page.next_page_number }}" aria-label="Next"> <span aria-hidden="true">下一页</span> </a> </li> {% else %} <li class="disabled"> <a href="" aria-label="Next"> <span aria-hidden="true">下一页</span> </a> </li> {% endif %} </ul> </nav> </div> </div> </body> </html>
4 核心逻辑
'''
显示左5，右5，总共11个页，
如果总页码大于11
1.1 if 当前页码减5小于1，要生成1到12的列表（顾头不顾尾，共11个页码）
page_range=range(1,12)
1.2 elif 当前页码+5大于总页码，生成当前页码减10，到当前页码加1的列表（顾头不顾尾，共11个页码）
page_range=range(paginator.num_pages-10,paginator.num_pages+1)
1.3 else 生成当前页码-5，到当前页码+6的列表
page_range=range(current_page_num-5,current_page_num+6)
其它情况，生成的列表就是pageinator的page_range
page_range=paginator.page_range
'''
核心逻辑
5 作业(利用ajax和装饰器结合传输数据)
index.html
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <script src="/static/jquery-3.3.1.js"></script> <title>Title</title> </head> <body> <button id="btn">点我</button> </body> <script> $("#btn").click(function () { var dic = {'name': 'egon'} var da=JSON.stringify(dic) $.ajax({ url: '/index/', type: 'post', contentType: 'application/json', data:da, success: function (data) { console.log(data) } }) }) </script> </html>
views
from django.shortcuts import render, HttpResponse # Create your views here. import json def auth_ajax(func): def inner(request, *args, **kwargs): request.data = request.POST print(request.data) try: request.data = json.loads(request.body.decode('utf-8')) except Exception as e: print(e) res = func(request, *args, **kwargs) return res return inner @auth_ajax def index(request): if request.method == 'GET': return render(request, 'index.html') elif request.method == 'POST': print(request.data) print(request.data.get('name')) return HttpResponse('ok')
