DJANGO 自定义分页组件

 

分页第二版：

from django.utils.safestring import mark_safe


class Pagination(object):
    def __init__(self, current_page, data_count, per_page_count=10, pager_num=7):
        try:
            self.current_page = int(current_page)
        except Exception as e:
            self.current_page = 1
        self.data_count = data_count
        self.per_page_count = per_page_count
        self.pager_num = pager_num

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

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

    @property
    def total_count(self):
        v, y = divmod(self.data_count, self.per_page_count)
        if y:
            v += 1
        return v

    def page_str(self, base_url):
        page_list = []

        if self.total_count < self.pager_num:
            start_index = 1
            end_index = self.total_count + 1
        else:
            if self.current_page <= (self.pager_num + 1) / 2:
                start_index = 1
                end_index = self.pager_num + 1
            else:
                start_index = self.current_page - (self.pager_num - 1) / 2
                end_index = self.current_page + (self.pager_num + 1) / 2
                if (self.current_page + (self.pager_num - 1) / 2) > self.total_count:
                    end_index = self.total_count + 1
                    start_index = self.total_count - self.pager_num + 1

        if self.current_page == 1:
            prev = '<li><a class="page" href="javascript:void(0);">上一页</a></li>'
        else:
            prev = '<li><a class="page" href="%s?p=%s">上一页</a></li>' % (base_url, self.current_page - 1,)
        page_list.append(prev)

        for i in range(int(start_index), int(end_index)):
            if i == self.current_page:
                temp = '<li class="active"><a class="page active" href="%s?p=%s">%s</a></li>' % (base_url, i, i)
            else:
                temp = '<li><a class="page" href="%s?p=%s">%s</a></li>' % (base_url, i, i)
            page_list.append(temp)

        if self.current_page == self.total_count:
            nex = '<li><a class="page" href="javascript:void(0);">下一页</a></li>'
        else:
            nex = '<li><a class="page" href="%s?p=%s">下一页</a></li>' % (base_url, self.current_page + 1,)
        page_list.append(nex)

        # jump = """
        # <input type='text'  /><a onclick='jumpTo(this, "%s?p=");'>GO</a>
        # <script>
        #     function jumpTo(ths,base){
        #         var val = ths.previousSibling.value;
        #         location.href = base + val;
        #     }
        # </script>
        # """ % (base_url,)
        #
        # page_list.append(jump)

        page_str = mark_safe("".join(page_list))

        return page_str

 

 

 

 

第一次在码云上面分享代码片段，记录一下：

https://gitee.com/trunkslisa/codes/14gkxi3zf9e2ulbvjnqyo90

 

 

class Pagination(object):
    def __init__(self, totalCount, currentPage, perPageNum=20, maxPageNum=7):
        # 传入：
        # -所有数据的个数 totalCount
        self.totalCount = totalCount

        # -当前页       currentPage
        try:
            v = int(currentPage)
            if v < 0:
                v = 1
            self.currentPage = v
        except Exception as e:
            self.currentPage = 1

        # -每页显示？？行 perPageNum
        self.perPageNum = perPageNum

        # -最多显示？？页 maxPageNum
        self.maxPageNum = maxPageNum

    # 开始条数
    def start(self):
        return (self.currentPage - 1) * self.perPageNum

    # 结束条数
    def end(self):
        return self.currentPage * self.perPageNum

    # 总页数

    # 采用这个装饰器以后，本来需要用self.num_pages()这个方法的，后面的括号可以不用写了
    @property
    def num_pages(self):
        # 取余数，不等于0的+1
        a, b = divmod(self.totalCount, self.perPageNum)
        if b == 0:
            return a
        return a+1

    # 根据情况生成相应的页码list
    def pager_num_range(self):
        # range应该根据当前页动态生成,自定制显示数量
        # 代指当前页           #self.current_page
        # 最多显示的页码数量     #self.per_page_num
        # 总页数              #self.num_pages

        # 判断一下传入的页码是否大于总页数
        if self.currentPage > self.num_pages:
            self.currentPage = self.num_pages


        # 总页数小于当前页
        if self.num_pages < self.currentPage:
            return range(1, self.num_pages+1)

        # 总页数有很多
        part = int(self.maxPageNum/2)    #拿到显示总数量的一半
        if self.currentPage <= part:
            return range(1, self.maxPageNum+1)

        # 判断当前页+part大于最后一页,显示最后一页至最后一页往前的per_pager_num的数量+1
        if (self.currentPage + part) > self.num_pages:
            return range(self.num_pages - self.maxPageNum + 1, self.num_pages+1)

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

    def page_str(self):
        page_list = []
        #首页
        first = '<li><a href="/index3.html?p=1">首页</a></li>'
        page_list.append(first)

        #增加上一页
        if self.currentPage == 1:

            prev = '<li><a href="#">上一页</a></li>'
        else:
            prev = '<li><a href="/index3.html?p=%s">上一页</a></li>' % (self.currentPage - 1)

        page_list.append(prev)

        #增加页码
        for i in self.pager_num_range():
            #给当前页做特殊标识
            if i == self.currentPage:
                temp = '<li class="active"><a>%s</a></li>' %(i)
            else:
                temp = '<li><a href="/index3.html?p=%s">%s</a></li>' %(i,i)
            page_list.append(temp)

        #增加下一页
        if self.currentPage >= self.num_pages:
            nex = '<li><a href="#">下一页</a></li>'
        else:
            nex = '<li><a href="/index3.html?p=%s">下一页</a></li>' %(self.currentPage + 1)
        page_list.append(nex)

        #增加尾页
        last = '<li><a href="/index3.html?p=%s">尾页</a></li>' %(self.num_pages)
        page_list.append(last)

        return ''.join(page_list)

from app01.pager import Pagination
from django.shortcuts import render
from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger

USER_LIST = []
for i in range(1, 666):
    temp = {'name': 'root' + str(i), 'age': i}
    USER_LIST.append(temp)

def index(request):
    
    current_Page = request.GET.get('p')
    #这里的666是个模拟数据，实际使用中应用实际数量替换该位置
    page_obj = Pagination(666, current_Page)
    #这里的USER_LIST是自己创建的模拟数据，主要为页面展示使用
    data_list = USER_LIST[page_obj.start():page_obj.end()]
    return render(request, 'index3.html', {'data': data_list, 'page_obj': page_obj})

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="/static/plugins/bootstrap/css/bootstrap.css">
</head>
<body>

<ul>
    {% for row in data %}
        <li>{{ row.name}}-{{ row.age }}</li>
    {% endfor %}
</ul>

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

</body>
</html>