paginator组件扩展

views

from django.core.paginator import Paginator,EmptyPage, PageNotAnInteger

#测试数据
USER_LIST = []
for i in range(666):
    temp = {'name':'root'+str(i),'age':i}
    USER_LIST.append(temp)

#扩展分页
class CustomPaginator(Paginator):
    def __init__(self,current_page,per_pager_num,*args,**kwargs):
        #当前页
        self.current_page = int(current_page)
        #最多显示页码数量
        self.per_pager_num = int(per_pager_num)

        super(CustomPaginator,self).__init__(*args,**kwargs)

    #自己扩展的方法
    def pager_num_range(self):
        # #当前页
        # self.ccurrent_page
        # #最多显示的页码数量
        # self.per_pager_num
        # #总页数
        # self.num_pages

        if self.num_pages < self.per_pager_num:
            return range(1,self.num_pages+1)

        part = int(self.per_pager_num/2)
        if self.current_page <= part:
            return range(1,self.per_pager_num+1)

        if (self.current_page+part) > self.num_pages:
            return range(self.num_pages-self.per_pager_num+1,self.num_pages+1)

        return range(self.current_page-part,self.current_page+part+1)



def index1(request):

    # 全部数据：USER_LIST，=》得出共有多少条数据
    # per_page: 每页显示条目数量
    # count:    数据 总个数
    # num_pages:总页数
    # page_range:总页数的索引范围，如: (1,10),(1,200)
    # page:     page对象（是否具有下一页；是否有上一页；）

    #全部时间，每页显示十条
    current_page = request.GET.get('p')

    paginator = CustomPaginator(current_page,7,USER_LIST,10)

    try:
        # Page对象
        posts = paginator.page(current_page)
        # has_next              是否有下一页
        # next_page_number       下一页页码
        # has_previous          是否有上一页
        # previous_page_number  上一页页码
        # object_list           分页之后的数据列表，已经切片好的数据
        # number                当前页
        # paginator             paginator对象
    except PageNotAnInteger:
        posts = paginator.page(1)
    except EmptyPage:
        posts = paginator.page(paginator.num_pages)

    return render(request,'index1.html',{'posts':posts})

html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>分页</title>
</head>
<body>

<ul>
    {% for row in posts.object_list %}
        <li>{{ row.name }}--{{ row.age }}</li>
    {% endfor %}
</ul>
    {% include 'include/pager.html' %}
</body>
</html>

include/pager.html

<!--分页导航条，提取重复代码-->
{% if posts.has_previous %}
    <a href="/index1.html?p={{ posts.previous_page_number }}">上一页</a>
{% else %}
    <a href="#">上一页</a>
{% endif %}

{% for i in posts.paginator.pager_num_range %}
    {% if i == posts.number %}
        <a style="color: red;font-size: 20px" href="/index1.html?p={{ i }}">{{ i }}</a>
    {% else %}
        <a href="/index1.html?p={{ i }}">{{ i }}</a>
    {% endif %}
{% endfor %}

{% if posts.has_next %}
    <a href="/index1.html?p={{ posts.next_page_number }}">下一页</a>
{% else %}
    <a href="#">下一页</a>
{% endif %}

<span>
    {{ posts.number }} / {{posts.paginator.num_pages  }}
</span>

自定义分页类+bootstrap框架

#Pagination类

class Pagination(object):
    #totalCount----总共的数据
    #currentPage----当前页的页码
    #perPageItemNum----每页显示的数据数量，默认没页10条数据
    #maxPageNum----分页导航条显示的数字范围，默认显示7个范围
    def __init__(self,totalCount,currentPage,perPageItemNum=10,maxPageNum=7):
        # 数据总个数
        self.total_count = totalCount
        #当前项
        try :
            v = int(currentPage)
            if v <= 0:
                v=1
            self.current_page = v
        except Exception as e:
            self.current_page = 1
        #每页显示的行数
        self.per_page_item_num = perPageItemNum
        #最多显示页面
        self.max_page_num = maxPageNum


    def start(self):
        return (self.current_page-1) * self.per_page_item_num

    def end(self):
        return self.current_page * self.per_page_item_num

    @property
    def num_pages(self):
        """
        总页数

        :return:
        """
        a,b = divmod(self.total_count,self.per_page_item_num)
        if b == 0:
            return a
        return a + 1

    #分页显示范围
    def pager_num_range(self):
        if self.num_pages < self.max_page_num:
            return range(1,self.num_pages+1)

        part = int(self.max_page_num/2)

        if self.current_page <= part:
            return range(1,self.max_page_num+1)

        if (self.current_page+part) > self.num_pages:
            return range(self.num_pages-self.max_page_num+1,self.num_pages+1)

        return range(self.current_page-part,self.current_page+part+1)

    def page_str(self):
        page_list = []

        first = "<li><a href='/index2.html?p=1'>首页</a></li>"
        page_list.append(first)

        if self.current_page == 1:
            prev = "<li><a href='#'>上一页</a></li>"
        else:
            prev = "<li><a href='/index2.html?p=%s'>上一页</a></li>" % (self.current_page - 1,)
        page_list.append(prev)
        for i in self.pager_num_range():
            if i == self.current_page:
                temp = "<li class='active'><a href='/index2.html?p=%s'>%s</a></li>" % (i, i)
            else:
                temp = "<li><a href='/index2.html?p=%s'>%s</a></li>" % (i, i)
            page_list.append(temp)

        if self.current_page == self.num_pages:
            nex = "<li><a href='#'>下一页</a></li>"
        else:
            nex = "<li><a href='/index2.html?p=%s'>下一页</a></li>" % (self.current_page + 1,)
        page_list.append(nex)

        last = "<li><a href='/index2.html?p=%s'>尾页</a></li>" % (self.num_pages,)
        page_list.append(last)

        return ''.join(page_list)

views

from app01.pager import Pagination

USER_LIST = []
for i in range(666):
    temp = {'name':'chen'+str(i),'age':i}
    USER_LIST.append(temp)

def index2(request):
    current_page = request.GET.get('p')
    page_obj = Pagination(666,current_page)

    data_list = USER_LIST[page_obj.start():page_obj.end()]
    return render(request,'index2.html',{'data':data_list,'page_obj':page_obj})

html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>自定义分页类+bootstrap</title>
    <link rel="stylesheet" href="/static/bootstrap-3.3.7-dist/css/bootstrap.css" />
</head>
<body>

<ul>
    {% for row in data %}
        <li>{{ row.name }}--{{ row.age }}</li>
    {% endfor %}
</ul>
    {% for i in page_obj.pager_num_range %}
        <a href="/index2.html?p={{ i }}">{{ i }}</a>
    {% endfor %}

<hr/>
    <ul class="pagination pagination-sm">
        {{ page_obj.page_str|safe }}
    </ul>

</body>
</html>