16 分页器
from django.core.paginator import Paginator
属性：
- paginator.count：数据总数
- paginator.num_pages：总页数
- paginator.page_range：页码的列表
def index(request): book_list=Book.objects.all() paginator=Paginator(book_list,20) print(paginator.count) print(paginator.num_pages) print(paginator.page_range) return render(request,'index.html',{"book_list":book_list})
获取指定页的数据
paginator.page(3)
属性：
- object_list：指定页内容列表
- 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
获取指定页数据的具体项
#拿去第三页的数据 page3=paginator.page(3) #获取page3中的所有数据 book_list=page3.object_list #也可以通过迭代显示数据 for i in page3: print(i)
通过URL参数获取指定页
current_page=int(request.GET.get("page",1)) current_page=paginator.page(current_page) return render(request,'index.html',{"current_page":current_page})
查询的数据不存在时处理方法，通过EmptyPage来抓取并处理
from django.core.paginator import Paginator,EmptyPage try: current_page=paginator.page(current_page) except EmptyPage: #超出查询范围，返回第一页数据 current_page = paginator.page(1)
分页器显示
动态展示分页后的内容，点击某页动态添加class样式
view内容
def index(request): """ #数据批量导入 book_list=[] for i in range(1000): book=Book(title="book_%s" % i,price=i*i) book_list.append(book) Book.objects.bulk_create(book_list) """ book_list=Book.objects.all() paginator=Paginator(book_list,40) # print(paginator.count) # print(paginator.num_pages) # print(paginator.page_range) #拿去第三页的数据 page3=paginator.page(3) #获取page3中的所有数据 book_list=page3.object_list #也可以通过迭代显示数据 for i in page3: #print(i) pass #当前第N页 current_page=int(request.GET.get("page",1)) try: #当前页具体内容 current_page_list=paginator.page(current_page) except EmptyPage: current_page_list = paginator.page(1) return render(request,'index.html',{"current_page_list":current_page_list,"page_range":paginator.page_range,'current_page':current_page})
html内容
<nav aria-label="Page navigation"> <ul class="pagination"> <li> <a href="#" aria-label="Previous"> <span aria-hidden="true">上一页</span> </a> </li> {% for item in page_range %} {% if current_page == item %} <li class="active"><a href="?page={{ item }}">{{ item }}</a></li> {% endif %} <li class=""><a href="?page={{ item }}">{{ item }}</a></li> {% endfor %} <li> <a href="#" aria-label="Next"> <span aria-hidden="true">下一页</span> </a> </li> </ul> </nav>
另一种方法显示页码，第一页后禁用“上一页”按钮
前端html
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>分页器</title> <link rel="stylesheet" href="/static/css/bootstrap.min.css"> </head> <body> <ul> {% for book in current_page %} <li>书名：{{ book.title }} 价格：{{ book.price }}</li> {% endfor %} </ul> <nav aria-label="Page navigation"> <ul class="pagination"> {% if current_page.has_previous %} <li> <a href="/?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 item in page_range %} {% if current_page_num == item %} <li class="active"><a href="?page={{ item }}">{{ item }}</a></li> {% else %} <li class=""><a href="?page={{ item }}">{{ item }}</a></li> {% endif %} {% endfor %} {% if current_page.has_next %} <li> <a href="/?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> </body> <script type="javascript"></script> </html>
后端view内容
current_page_num=int(request.GET.get("page",1)) try: #当前页具体内容 current_page=paginator.page(current_page_num) except EmptyPage: current_page = paginator.page(1) has_previous=current_page.has_previous() has_next=current_page.has_next() return render(request,'index.html',{"has_previous":has_previous,"has_next":has_next,"current_page":current_page,"page_range":paginator.page_range,"current_page_num":current_page_num,"previous_page_number":current_page.previous_page_number})
分页太多，不全部展示
处理page_range，即需要展示的页码不再是paginator.page_range，而是通过条件对其分段
view代码
current_page_num=int(request.GET.get("page",1)) if paginator.num_pages>11: if current_page_num-5 <=1 : page_range=range(1,11) elif current_page_num+5>paginator.num_pages: page_range=range(paginator.num_pages-11,paginator.num_pages+1) else: page_range=range(current_page_num-5,current_page_num+6) else: page_range=paginator.page_range
html代码
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>分页器</title> <link rel="stylesheet" href="/static/css/bootstrap.min.css"> </head> <body> <ul> {% for book in current_page %} <li>书名：{{ book.title }} 价格：{{ book.price }}</li> {% endfor %} </ul> <nav aria-label="Page navigation"> <ul class="pagination"> {% if current_page.has_previous %} <li> <a href="/?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 item in page_range %} {% if current_page_num == item %} <li class="active"><a href="?page={{ item }}">{{ item }}</a></li> {% else %} <li class=""><a href="?page={{ item }}">{{ item }}</a></li> {% endif %} {% endfor %} {% if current_page.has_next %} <li> <a href="/?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> </body> <script type="javascript"></script> </html>
