好久没来写东西那！今天写个自定义分页器给大家参考下吧
首先我们在自己创建的Django项目的app下新建一个utils文件夹，用来放我们的分页器组件
简单说下分页器实现原理：
1.利用ORM查询语句的限制数据条数来确定每页显示的数据
2.设置我们每页显示的数据条数以及每页显示的页码数（例如本次默认页码数是11）
3.判断要显示的数据条数的页码数是否大于我们设置的页码总数
4.如果大于,则判断是否是页码总数的前段还是后段，是否要翻页处理；比如我们设置的页码总数是11个，那么就是用当前页-1/2得到半数，最后根据半数的值判断是否翻页
5.先利用函数的方式实现，随后利用class来完成封装
我们在utils文件下创建有个pager.py的文件
""" 自定义分页组件的使用方法：pager_obj = Pagination(request.GET.get('page',1),len(HOST_LIST),request.path_info,request.GET)host_list = HOST_LIST[pager_obj.start:pager_obj.end]html = pager_obj.page_html()return render(request,'hosts.html',{'host_list':host_list,"page_html":html}) """class Pagination(object):"""自定义分页"""def __init__(self,current_page,total_count,base_url,params,per_page_count=10,max_pager_count=11):try:current_page = int(current_page)except Exception as e:current_page = 1if current_page <=0:current_page = 1self.current_page = current_page# 数据总条数self.total_count = total_count# 每页显示10条数据self.per_page_count = per_page_count# 页面上应该显示的最大页码max_page_num, div = divmod(total_count, per_page_count)if div:max_page_num += 1self.max_page_num = max_page_num# 页面上默认显示11个页面（当前页在中间）self.max_pager_count = max_pager_countself.half_max_pager_count = int((max_pager_count - 1) / 2)# URL前缀self.base_url = base_url# request.GETimport copyparams = copy.deepcopy(params)# 设置request能修改取到的值params._mutable = True# 包含当前列表页面所有的搜索条件# {source:[2,], status:[2], gender:[2],consultant:[1],page:[1]}# self.params[page] = 8# self.params.urlencode()# source=2&status=2&gender=2&consultant=1&page=8# href="/hosts/?source=2&status=2&gender=2&consultant=1&page=8"# href="%s?%s" %(self.base_url,self.params.urlencode())self.params = params@propertydef start(self):return (self.current_page - 1) * self.per_page_count@propertydef end(self):return self.current_page * self.per_page_countdef page_html(self):# 如果总页数 <= 11if self.max_page_num <= self.max_pager_count:pager_start = 1pager_end = self.max_page_num# 如果总页数 > 11else:# 如果当前页 <= 5if self.current_page <= self.half_max_pager_count:pager_start = 1pager_end = self.max_pager_countelse:# 当前页 + 5 > 总页码if (self.current_page + self.half_max_pager_count) > self.max_page_num:pager_end = self.max_page_numpager_start = self.max_page_num - self.max_pager_count + 1else:pager_start = self.current_page - self.half_max_pager_countpager_end = self.current_page + self.half_max_pager_countpage_html_list = []# {source:[2,], status:[2], gender:[2],consultant:[1],page:[1]}self.params['page'] = 1first_page = '<a href="%s?%s">首页</a>' % (self.base_url,self.params.urlencode(),)page_html_list.append(first_page)# 上一页if self.current_page == 0:page_up = '<a href="%s?%s">上一页</a>' % (self.base_url,self.params.urlencode())else:self.params['page'] = self.current_page - 1page_up = '<a class="active" href="%s?%s">上一页</a>' % (self.base_url,self.params.urlencode())page_html_list.append(page_up)for i in range(pager_start, pager_end + 1):self.params['page'] = iif i == self.current_page:temp = '<a class="active" href="%s?%s">%s</a>' % (self.base_url,self.params.urlencode(), i,)else:temp = '<a href="%s?%s">%s</a>' % (self.base_url,self.params.urlencode(), i,)page_html_list.append(temp)# 下一页if self.current_page == self.max_page_num:page_down = '<a href="%s?%s">下一页</a>' % (self.base_url,self.params.urlencode())else:self.params['page'] = self.current_page + 1page_down = '<a class="active" href="%s?%s">下一页</a>' % (self.base_url,self.params.urlencode())page_html_list.append(page_down)self.params['page'] = self.max_page_numlast_page = '<a href="%s?%s">尾页</a>' % (self.base_url, self.params.urlencode(),)page_html_list.append(last_page)return ''.join(page_html_list)
然后我们在view.py视图中调用
def hosts(request):from .utils.pager import PaginationHOST_LIST = []for i in range(1, 213):HOST_LIST.append("c%s.com" % i)pager_obj = Pagination(request.GET.get('page',1),len(HOST_LIST),request.path_info,request.GET)HOST_LIST = HOST_LIST[pager_obj.start:pager_obj.end]page_html = pager_obj.page_html()return render(request,'hosts.html',locals())
这样就完成那！
