django之分页插件

 from django.utils.safestring import mark_safe

 class Page:
     def __init__(self, current_page, data_count, per_page_count=2, pager_num=7):
         self.current_page = current_page
         self.data_count = data_count
         self.per_page_count = per_page_count
         self.pager_num = pager_num

     @property
     def start(self):
         return (self.current_page - 1) * self.per_page_count

     @property
     def end(self):
         return self.current_page * self.per_page_count

     @property
     def total_count(self):
         v, y = divmod(self.data_count, self.per_page_count)
         if y:
             v += 1
         return v

     def page_str(self, base_url):
         page_list = []

         if self.total_count < self.pager_num:
             start_index = 1
             end_index = self.total_count + 1
         else:
             if self.current_page <= (self.pager_num + 1) / 2:
                 start_index = 1
                 end_index = self.pager_num + 1
             else:
                 start_index = self.current_page - (self.pager_num - 1) / 2
                 end_index = self.current_page + (self.pager_num + 1) / 2
                 if (self.current_page + (self.pager_num - 1) / 2) > self.total_count:
                     end_index = self.total_count + 1
                     start_index = self.total_count - self.pager_num + 1

         if self.current_page == 1:
             prev = '<a class="page" href="javascript:void(0);">上一页</a>'
         else:
             prev = '<a class="page" href="%s?p=%s">上一页</a>' % (base_url, self.current_page - 1,)
         page_list.append(prev)

         for i in range(int(start_index), int(end_index)):
             if i == self.current_page:
                 temp = '<a class="page active" href="%s?p=%s">%s</a>' % (base_url, i, i)
             else:
                 temp = '<a class="page" href="%s?p=%s">%s</a>' % (base_url, i, i)
             page_list.append(temp)

         if self.current_page == self.total_count:
             nex = '<a class="page" href="javascript:void(0);">下一页</a>'
         else:
             nex = '<a class="page" href="%s?p=%s">下一页</a>' % (base_url, self.current_page + 1,)
         page_list.append(nex)

         jump = """
         <input type='text'  /><a onclick='jumpTo(this, "%s?p=");'>GO</a>
         <script>
             function jumpTo(ths,base){
                 var val = ths.previousSibling.value;
                 location.href = base + val;
             }
         </script>
         """ % (base_url,)

         page_list.append(jump)

         page_str = mark_safe("".join(page_list))

         return page_str

分页插件使用手册：

1.在APP同级目录创建 utils目录

　2.在utils目录内创建 pagination.py文件，把上边的代码复制进去

　3.视图函数调用示例。

 def host(request):
     if request.method == "GET":
         host_list = models.HostInfo.objects.all()
         group_list = models.HostGroup.objects.all()
         print(">>>",group_list)

         current_page = request.GET.get('p', 1)
         current_page = int(current_page)
         val = request.GET.get('per_page_count', 2)
         val = int(val)
         page_obj = pagination.Page(current_page, len(host_list), val)
         data = host_list[page_obj.start:page_obj.end]
         page_str = page_obj.page_str("/host")
         return  render(request,"host.html",{"host_list": data,"group_list":group_list,"page_str":page_str})
     elif request.method == "POST":
         print("post method")
         hostname = request.POST.get("hostname")
         hostip = request.POST.get("hostip")
         hostpassword = request.POST.get("password")
         group_id = request.POST.get("group_id")
         models.HostInfo.objects.create(serverip=hostip,servername=hostname,serverpassword=hostpassword,servergroup_id=group_id)
         return redirect("/host")

　4.前端html参考添加

     <style>
         .pagination .page{
             display: inline-block;
             padding: 5px;
             background-color: cyan;
             margin: 5px;
         }
         .pagination .page.active{
             background-color: brown;
             color: white;
         }

     </style>

         </div>
             <div style="align:center ;position: fixed;bottom: 3%;left: 40%" class="pagination">
         {{ page_str }}
             </div>