一 Paginator分页器
1 首先在数据库中生成大量数据
def index(request) book_list = [] for i in rang(1000) book = Book(title="book_%s" %i, price=i*i) book_list.append(book) Book.objects.bulk_create(book_list) # 批量插入数据
2 分页器中的主要方法
from django.core.paginator import Paginator paginator = Paginator(book_list,8) # 每页展示几条内容 print("count:",paginator.count) # 总页数 print("page_range",paginator.page_range) # 页码的列表 print("num_pages",paginator.num_pages) # 总页数 page1 = paginator.page(1) # 第1页的page对象 for i in page1 # 遍历第1页的所有数据对象 print(i) page2 = paginator.page(2) print(page2.hax_next()) # 是否有下一页 print(page2.next_page_number()) # 下一页页码 print(page2.has_pervious()) # 是否有上一页 print(page2.pervious_page_number()) # 上一页的页码
3 实现页面分页
模板:
{% if current_page.has_previous %} 先判断是否有上一页,如果没有就把'上一页'关闭 <li> <a href="?page={{ current_page_num|add:-1 }}" aria-label="Previous"> <span aria-hidden="true">«</span> </a> </li> {% else %} <li class="disabled"> <a href="" aria-label="Previous"> <span aria-hidden="true">«</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><a href="?page={{ item }}">{{ item }}</a></li> {% endif %} {% endfor %} {% if current_page.has_next %} <li> <a href="?page={{ current_page_num|add:1 }}" aria-label="Next"> <span aria-hidden="true" class="put-right">»</span> </a> </li> {% endif %}
视图函数:
book_list = Book.objects.all() # 获取全部数据 paginator = Paginator(book_list, 10) # 每页显示10条内容 current_page_num = int(request.GET.get("page", 1)) # 当前在哪一页 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 print("count:", paginator.count) print("num_pages:", paginator.num_pages) print("page_range:", page_range) for i in page_range: print(i) try: current_page = paginator.page(current_page_num) # 第一页的数据对象 print("object_list", current_page.object_list) except: current_page = paginator.page(1) return render(request, 'index.html',locals())
二 自定义分页
1 直接在函数中实现分页
def get_data(req): if req.metho == 'GET': current_page = request.GET.get('page',1) # 获取用户传来的请求页面(相当于当前页面),默认是1 current_page = int(current_page) # 制造切片 start = (current_page - 1) * 10 end = current_page * 10 data = models.User.objects.all()[start:end] # 一次取10条数据 # 总个数 total_count = models.Classes.objects.all().count() # 用总个数和每页显示的个数相处,求商和余数,如果有余数总页码还需+1 v,a = divmod(total_count,10) # 相当于总页数 if a != 0: v+=1 # 生成页码 page_list = [] # 如果是第一页那么上一页的功能就取消 if current_page == 1: page_list.append('<a href="#">上一页</a>' %(current_page-1) else: page_list.append('<a href="/index?page=%s">上一页</a>' %(current_page-1) # 判断并生成page_range if v <= 11: pager_range_start =1 ager_range_end = v else: if current_page <6: pager_range_start = 1 pager_range_end = 11 +1 else: pager_range_start = current_page -5 pager_range_end = current_page +6 if pager_range_end > v: page_range_start = current_page - 10 pager_range_end = v +1 for i in range(pager_range_star,pager_range_end) if i == current_page: page_list.append('<a href="/index?page=%s" class=actice>%s</a>' %(i,i)) page_list.append('<a href="/index?page=%s">%s</a>' %(i,i)) # 如果当前页是最后一页那么下一页功能就取消 if current_page == v: page_list.append('<a href="#">下一页</a>' %(current_page+1) else: page_list.append('<a href="/index?page=%s">下一页</a>' %(current_page+1) pager = "".join(pager_list) return render(request,{'data':data,'str_page':pager})
2 将自定义的分页器封装成一个类
class PagerHandler: def __inin__(self,total_count,current_page, base_url. per_page=10): self.total_count = total_count self.current_page = current_page self.base_url = base_url self.per_page = per_page def db_start(self): return (self.current_page -1) * self.per_page def db_end(self): return (self.current_page) * self.per_page def tootal_page(self): v,a = divmod(total_count,10) # 相当于总页数 if a != 0: v+=1 return v def pager_str(self): v = self.tootal_page() # 生成页码 page_list = [] # 如果是第一页那么上一页的功能就取消 if self.current_page == 1: page_list.append('<a href="#">上一页</a>' %(self.current_page-1) else: page_list.append('<a href="/%s?page=%s">上一页</a>' %(self.base_url,self.current_page-1) # 判断并生成page_range if v <= 11: pager_range_start =1 pager_range_end = v else: if current_page <6: pager_range_start = 1 pager_range_end = 11 +1 else: pager_range_start = self.current_page -5 pager_range_end = self.current_page +6 if pager_range_end > v: page_range_start = self.current_page - 10 pager_range_end = v +1 for i in range(pager_range_star,pager_range_end) if i == self.current_page: page_list.append('<a href="/%s?page=%s" class=actice>%s</a>' %(self.base_url,i,i)) page_list.append('<a href="/%s?page=%s">%s</a>' %(self.base_url,i,i)) # 如果当前页是最后一页那么下一页功能就取消 if self.current_page == v: page_list.append('<a href="#">下一页</a>' %(self.current_page+1) else: page_list.append('<a href="/%s?page=%s">下一页</a>' %(self.base_url,self.current_page+1) pager = "".join(pager_list) return pager
3 在视图函数中调用
def index(request) if request.method == 'GET': current_page = request.GET.get('page',1) current_page = int(current_page) # 数据总数 total_count = models.Classes.objects.all().count() page_obj = PagerHandler(total_count,current_page,'/index/') pager = page_obj.pager_str() data = models.Classes.objects.all()[page_obj.db_start():page_obj.db_end()]
return render(request,'index.html',{'data':data,'pager':pager})