分页器代码

 调用和使用方法

代码

def index(request):
    params = request.GET()
    from .utils.page import Pagination
    page_num=request.GET.get("page",1)
    book_list=Book.objects.all()
    total_count=Book.objects.all().count()
    base_url=request.path_info
    page=Pagination(page_num,total_count,base_url,params,per_page_num=8,pager_count=11)
    book_list=book_list[page.start:page.end]

    page_html=page.page_html()

    return render(request,"index.html",locals())
View Code

 

分页器代码

class Pagination(object):

    def __init__(self,current_page,all_count,base_url,params,per_page_num=8,pager_count=11,):
        """
        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 base_url: 分页中显示的URL前缀
        :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

        self.base_url = base_url

        # 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)

        self.params=params # {"id":1,"title":"python","page":109}--->"id=1&title=python&page=109"

    #返回将要显示的数据的起始数
    @property
    def start(self):
        return (self.current_page - 1) * self.per_page_num
    
    #放回将要现实的数据的终止数
    @property
    def end(self):
        return self.current_page * self.per_page_num
    #返回在页面显示的标签，包含上一页下一页和11个页码
    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(11-1)/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_start = self.all_pager - self.pager_count + 1
                    pager_end = self.all_pager + 1

                else:
                    pager_start = self.current_page - self.pager_count_half
                    pager_end = self.current_page + self.pager_count_half + 1

        page_html_list = []

        first_page = '<li><a href="%s?page=%s">首页</a></li>' % (self.base_url,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="%s?page=%s">上一页</a></li>' % (self.base_url,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="%s?page=%s">%s</a></li>' % (self.base_url,i, i,)
            else:
                temp = '<li><a href="%s?">%s</a></li>' % (self.base_url,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="%s?page=%s">下一页</a></li>' % (self.base_url,self.current_page + 1,)
        page_html_list.append(next_page)

        last_page = '<li><a href="%s?page=%s">尾页</a></li>' % (self.base_url,self.all_pager,)
        page_html_list.append(last_page)

        return ''.join(page_html_list)
View Code

HTML中的代码

<!DOCTYPE html>
<html lang="zh-cn">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Title</title>
    <!-- 最新版本的 Bootstrap 核心 CSS 文件 -->
<link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
</head>
<body>

<ul>
    {% for book in book_list %}
    <li>{{ book.title }}-----{{ book.price }}</li>
    {% endfor %}

</ul>


<nav aria-label="Page navigation">
  <ul class="pagination">
     {{ page_html|safe }}
  </ul>
</nav>

</body>
</html>
View Code

 

posted on 2018-03-19 11:03  王大拿  阅读(189)  评论(0)    收藏  举报

导航