Django学习【第11篇】:Django之分页升级版本(组件)

一、分页的实现与使用

复制代码
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 = 1
        if current_page <=0:
            current_page = 1
        self.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 += 1
        self.max_page_num = max_page_num

        # 页面上默认显示11个页码(当前页在中间)
        self.max_pager_count = max_pager_count
        self.half_max_pager_count = int((max_pager_count - 1) / 2)

        # URL前缀
        self.base_url = base_url

        # request.GET
        import copy
        params = copy.deepcopy(params)
        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

    @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

    def page_html(self):
        # 如果总页数 <= 11
        if self.max_page_num <= self.max_pager_count:
            pager_start = 1
            pager_end = self.max_page_num
        # 如果总页数 > 11
        else:
            # 如果当前页 <= 5
            if self.current_page <= self.half_max_pager_count:
                pager_start = 1
                pager_end = self.max_pager_count
            else:
                # 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_num
                    pager_start = self.max_page_num - self.max_pager_count + 1   #倒这数11个
                else:
                    pager_start = self.current_page - self.half_max_pager_count
                    pager_end = self.current_page + self.half_max_pager_count

        page_html_list = []
        # {source:[2,], status:[2], gender:[2],consultant:[1],page:[1]}
        # 首页
        self.params['page'] = 1
        first_page = '<li><a href="%s?%s">首页</a></li>' % (self.base_url,self.params.urlencode(),)
        page_html_list.append(first_page)
# 上一页 self.params["page"] = self.current_page - 1 if self.params["page"] < 1: pervious_page = '<li class="disabled"><a href="%s?%s" aria-label="Previous">上一页</span></a></li>' % ( self.base_url, self.params.urlencode()) else: pervious_page = '<li><a href = "%s?%s" aria-label = "Previous" >上一页</span></a></li>' % ( self.base_url, self.params.urlencode()) page_html_list.append(pervious_page)
# 中间页码 for i in range(pager_start, pager_end + 1): self.params['page'] = i if i == self.current_page: temp = '<li class="active"><a href="%s?%s">%s</a></li>' % (self.base_url,self.params.urlencode(), i,) else: temp = '<li><a href="%s?%s">%s</a></li>' % (self.base_url,self.params.urlencode(), i,) page_html_list.append(temp) # 下一页 self.params["page"] = self.current_page + 1 if self.params["page"] > self.max_page_num: self.params["page"] = self.current_page next_page = '<li class="disabled"><a href = "%s?%s" aria-label = "Next">下一页</span></a></li >' % ( self.base_url, self.params.urlencode()) else: next_page = '<li><a href = "%s?%s" aria-label = "Next">下一页</span></a></li>' % ( self.base_url, self.params.urlencode()) page_html_list.append(next_page) # 尾页 self.params['page'] = self.max_page_num last_page = '<li><a href="%s?%s">尾页</a></li>' % (self.base_url, self.params.urlencode(),) page_html_list.append(last_page) return ''.join(page_html_list)
复制代码

二、使用

复制代码
"""
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})
"""
复制代码

 三、批量查数据

 

  #批量创建数据
    # booklist = []
    # for i in range(100):
    #     booklist.append(models.Book(name="book" + str(i), price=20 + i * i))
    #
    # models.Book.objects.bulk_create(booklist)

 

posted @ 2018-12-21 15:44  Anna_kc  阅读(149)  评论(0编辑  收藏  举报