自定义分页器的创建

第一步：后端配置

 

首先创建一个utils文件夹

在utils文件夹内创建一个py文件——mypage.py

 

书写代码：

class Pagination(object):
    def __init__(self, current_page, all_count, per_page_num=10, pager_count=7):
        """
        封装分页相关数据
        :param current_page: 当前页
        :param all_count:    数据库中的数据总条数
        :param per_page_num: 每页显示的数据条数
        :param pager_count:  最多显示的页码个数
        """
        try:
            current_page = int(current_page)
        except Exception as e:
            current_page = 1

        if current_page < 1:
            current_page = 1

        self.current_page = current_page

        self.all_count = all_count
        self.per_page_num = per_page_num

        # 总页码
        all_pager, tmp = divmod(all_count, per_page_num)
        if tmp:
            all_pager += 1
        self.all_pager = all_pager

        self.pager_count = pager_count
        self.pager_count_half = int((pager_count - 1) / 2)

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

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

    def page_html(self):
        # 如果总页码 < 11个：
        if self.all_pager <= self.pager_count:
            pager_start = 1
            pager_end = self.all_pager + 1
        # 总页码  > 11
        else:
            # 当前页如果<=页面上最多显示11/2个页码
            if self.current_page <= self.pager_count_half:
                pager_start = 1
                pager_end = self.pager_count + 1

            # 当前页大于5
            else:
                # 页码翻到最后
                if (self.current_page + self.pager_count_half) > self.all_pager:
                    pager_end = self.all_pager + 1
                    pager_start = self.all_pager - self.pager_count + 1
                else:
                    pager_start = self.current_page - self.pager_count_half
                    pager_end = self.current_page + self.pager_count_half + 1

        page_html_list = []
        # 添加前面的nav和ul标签
        page_html_list.append('''
                    <nav aria-label='Page navigation>'
                    <ul class='pagination'>
                ''')
        first_page = '<li><a href="?page=%s">首页</a></li>' % (1)
        page_html_list.append(first_page)

        if self.current_page <= 1:
            prev_page = '<li class="disabled"><a href="#">上一页</a></li>'
        else:
            prev_page = '<li><a href="?page=%s">上一页</a></li>' % (self.current_page - 1,)

        page_html_list.append(prev_page)

        for i in range(pager_start, pager_end):
            if i == self.current_page:
                temp = '<li class="active"><a href="?page=%s">%s</a></li>' % (i, i,)
            else:
                temp = '<li><a href="?page=%s">%s</a></li>' % (i, i,)
            page_html_list.append(temp)

        if self.current_page >= self.all_pager:
            next_page = '<li class="disabled"><a href="#">下一页</a></li>'
        else:
            next_page = '<li><a href="?page=%s">下一页</a></li>' % (self.current_page + 1,)
        page_html_list.append(next_page)

        last_page = '<li><a href="?page=%s">尾页</a></li>' % (self.all_pager,)
        page_html_list.append(last_page)
        # 尾部添加标签
        page_html_list.append('''
                                           </nav>
                                           </ul>
                                       ''')
        return ''.join(page_html_list)

 

 

第二步: 视图层views.py中调用

from utils.pager import Pagination

current_page = request.GET.get('page', 1)
文章表_queryset = models.文章表.objects.all()
all_count = book_queryset.count()

# 1. 传值生成对象
page_obj = Pagination(current_page=current_page, all_count=all_count)
# 2. 直接对总数据进行切片操作
page_queryset = 文章表_queryset[page_obj.start:page_obj.end]
# 3. 将page_queryset传递到页面. 这就是当前所展示的页面部分
return render(request, 'xxx.html', locals())

 

 

还可以设置每一页限制的文章数量(per_page_num=)

page_obj = Pagination(current_page=request.GET.get('page', 1), all_count=文章表_queryset.count(), per_page_num=5)  # per_page_num 是每页限制文章数量

page_queryset = 文章表_queryset[page_obj.start:page_obj.end]

 

　　

第三步：前端配置

需要安装依赖：jQuery、bootstrap

 

书写代码：

{% for 文章表_obj in page_queryset %}
    <p>{{ 文章表_obj.title }}</p>    {# 分页的内容部分 #}
{% endfor %}

{#利用自定义分页器直接显示分页器样式#}
{{ page_obj.page_html|safe }}