python Django学习（12）——分页

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本文链接： https://blog.csdn.net/weixin_42567323/article/details/102581288

前言

    有时候我们在前端显示的数据非常多,但又不能显示在一个页面中,这个时候就需要用到分页了.

分页流程

• 创建一个pagenition.py文件,封装一个用于分页的类:

from django.utils.safestring import mark_safe

class Page(object):
    def __init__(self,current_page,data_count,per_page_count=10,page_num = 7):
        self.current_page = current_page                # 当前页
        self.data_count = data_count                    # 数据总个数
        self.per_page_count = per_page_count            # 每页显示数据个数
        self.page_num = page_num                        # 显示多少页

    @property
    def start(self):
        '''
        获取起始位置
        :return:
        '''
        return (self.current_page-1) * self.per_page_count

    @property
    def end(self):
        '''
        获取结束位置
        :return:
        '''
        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.page_num:
            start_index = 1
            end_index = self.total_count + 1
        else:
            if self.current_page <= (self.page_num + 1) / 2:
                start_index = 1
                end_index = self.page_num + 1
            else:
                start_index = self.current_page - (self.page_num - 1) / 2
                end_index = self.current_page + (self.page_num + 1) / 2
                if (self.current_page + (self.page_num - 1) / 2) > self.total_count:
                    end_index = self.total_count + 1
                    start_index = self.total_count - self.page_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 οnclick='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

• 调用这个类,完成分页功能:

def user_list(request):
    current_page = request.GET.get('p', 1)
    current_page = int(current_page)

    val = request.COOKIES.get('per_page_count', 10)
    val = int(val)
    page_obj = Page(current_page, len(LIST), val)

    data = LIST[page_obj.start:page_obj.end]

    page_str = page_obj.page_str("/app01/userlist/")

    return render(request, 'user_list.html', {'li': data, 'page_str': page_str})

写在最后

    本文是个人的一些学习笔记,如有侵权,请及时联系我进行删除,谢谢大家.