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>