013---Django的分页器

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分页

Django的分页器(paginator)

view

 1 def index(request):
 2     # 创建数据
 3     # book_list = [Book(title=Hello Python,price=price) for price in range(100)]
 4     # res = Book.objects.bulk_create(book_list)  # 批量创建,效率高
 5     # print(res)
 6     book_list = Book.objects.all()
 7     # return HttpResponse(ok)
 8 
 9     paginator = Paginator(book_list, 5)
10 
11     # 打印
12     print(数据总数:, paginator.count)  # 100
13     print(总页数:, paginator.num_pages)  # 10
14     print(页码列表:, paginator.page_range)  # range(1, 11)
15 
16     current_page_num = int(request.GET.get(page, 1))
17     if paginator.num_pages > 11:
18         if current_page_num - 5 < 1:
19             p1 = 1
20             p2 = 11
21         elif current_page_num + 5 > paginator.num_pages:
22             p1 = paginator.num_pages - 10
23             p2 = paginator.num_pages + 1
24         else:
25             p1 = current_page_num - 5
26             p2 = current_page_num + 6
27         page_range = range(p1, p2)
28     else:
29         page_range = paginator.page_range
30     try:
31         current_page = paginator.page(current_page_num)  # 第几页的数据
32     except EmptyPage as e:
33         current_page = paginator.page(1)
34     return render(request, book_list.html, locals())

 

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<!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>书籍列表</title>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css"
integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">

</head>
<body>


<ul>
{% for book in current_page %}
<li>名称:{{ book.title }}----价格:{{ book.price }}</li>
<br>
{% endfor %}

</ul>

<nav aria-label="Page navigation">
<ul class="pagination">
{% if current_page.has_previous %}
<li>
<a href="?page={{ current_page.previous_page_number }}" aria-label="Previous"><span aria-hidden="true">上一页</span></a>
</li>
{% else %}
<li class="disabled">
<a href="" aria-label="Previous"><span aria-hidden="true">上一页</span></a>
</li>
{% endif %}

{% for num in page_range %}
{% if current_page_num == num %}
<li class="active"><a href="?page={{ num }}">{{ num }}</a></li>
{% else %}
<li><a href="?page={{ num }}">{{ num }}</a></li>
{% endif %}
{% endfor %}
{% if current_page.has_next %}
<li><a href="?page={{ current_page.next_page_number }}" aria-label="Next"><span
aria-hidden="true">下一页</span></a></li>
{% else %}
<li class="disabled">
<a href="" aria-label="Previous"><span aria-hidden="true">上一页</span></a>
</li>
{% endif %}

</ul>
</nav>


</body>
</html>
 

扩展

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def index(request):


    book_list=Book.objects.all()

    paginator = Paginator(book_list, 15)
    page = request.GET.get(page,1)
    currentPage=int(page)

    #  如果页数十分多时,换另外一种显示方式
    if paginator.num_pages>30:

        if currentPage-5<1:
            pageRange=range(1,11)
        elif currentPage+5>paginator.num_pages:
            pageRange=range(currentPage-5,paginator.num_pages+1)

        else:
            pageRange=range(currentPage-5,currentPage+5)

    else:
        pageRange=paginator.page_range


    try:
        print(page)
        book_list = paginator.page(page)
    except PageNotAnInteger:
        book_list = paginator.page(1)
    except EmptyPage:
        book_list = paginator.page(paginator.num_pages)


    return render(request,"index.html",locals())
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自定义分页器

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"""
分页组件使用示例:

    obj = Pagination(request.GET.get(‘page‘,1),len(USER_LIST),request.path_info)
    page_user_list = USER_LIST[obj.start:obj.end]
    page_html = obj.page_html()

    return render(request,‘index.html‘,{‘users‘:page_user_list,‘page_html‘:page_html})


"""


class Pagination(object):

    def __init__(self,current_page,all_count,base_url,per_page_num=2,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)

    @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 = []

        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?page=%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)
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