分页功能 封装代码

分页功能 封装代码

目录

• 分页功能 封装代码
• 分页代码 逻辑和样式
• View 使用示列
• html 页面引用 bootstrap样式

分页代码 逻辑和样式

from django.utils.safestring import mark_safe
from django.http.request import QueryDict

class Pagination:
    """
    需要参数
    page: 当前的页码数(必填)
    all_count： 总的数据量(可填)
    per_num ：  每页显示的数据量(选填)
    max_show：  最多显示的页码数(选填)
    """

    def __init__(self, page, all_count, per_num=10, max_show=11): 
        try:
            self.page = int(page)
            if self.page <= 0:
                self.page = 1
        except Exception:
            self.page = 1

        # 总的数据量
        all_count = all_count
        # 每页显示的数据量  10

        # 总的页码数
        total_num, more = divmod(all_count, per_num)
        if more:
            total_num += 1
        # 最大显示的页码数
        half_show = max_show // 2

        if total_num <= max_show:
            page_start = 1
            page_end = total_num
        else:
            if self.page - half_show <= 0:
                # 页码的起始值
                page_start = 1
                # 页码的终止值
                page_end = max_show
            elif self.page + half_show > total_num:
                page_end = total_num
                page_start = total_num - max_show + 1

            else:
                # 页码的起始值
                page_start = self.page - half_show
                # 页码的终止值
                page_end = self.page + half_show

        self.page_start = page_start
        self.page_end = page_end
        self.total_num = total_num
        self.start = (self.page - 1) * per_num
        self.end = self.page * per_num

    @property
    def page_html(self):
        li_list = []

        if self.page == 1:
            li_list.append(
                '<li class="disabled"><a aria-label="Previous"> <span aria-hidden="true">&laquo;</span></a></li>')
        else:
            li_list.append(
                '<li><a href="?page={}" aria-label="Previous"> <span aria-hidden="true">&laquo;</span></a></li>'.format(
                    self.page - 1))

        for i in range(self.page_start, self.page_end + 1):
            if i == self.page:
                li_list.append('<li class="active"><a href="?page={}">{}</a></li>'.format(i, i))
            else:
                li_list.append('<li><a href="?page={}">{}</a></li>'.format(i, i))

        if self.page == self.total_num:
            li_list.append(
                '<li class="disabled"><a aria-label="Next"> <span aria-hidden="true">&raquo;</span></a></li>')
        else:
            li_list.append(
                '<li><a href="?page={}" aria-label="Next"> <span aria-hidden="true">&raquo;</span></a></li>'.format(
                    self.page + 1))

        return ''.join(li_list)

View 使用示列

# 公私户,批量操作
class CustomerList(View):
    def get(self, request, *args, **kwargs):
        q = self.search(["qq", "name", "phone"])
        if request.path_info == reverse('customer_list'):
            title = '公共客户'
            all_customer = models.Customer.objects.filter(q, consultant__isnull=True)
        else:
            title = '我的客户'
            all_customer = models.Customer.objects.filter(q, consultant=request.user_obj)
        page = Pagination(request.GET.get('page', 1), all_customer.count(), request.GET.copy(), 3)
        return render(request, 'consultant/customer_list.html',
                      {"all_customer": all_customer[page.start:page.end], 'page_html': page.page_html, "title": title}) #传入参数

html 页面引用 bootstrap样式

<script src="bootstrap-3.3.7/css/bootstrap.css"></script>
<nav aria-label="Page navigation">
	<ul class="pagination">
       {{ page_html }}
    </ul>
</nav>