自定义分页组件

#########自定义分页模块##########
"""
自定义分页组件的使用方法：
    pager_obj = Pagination(request.GET.get('page',1),len(HOST_LIST),request.path_info)
    host_list = HOST_LIST[pager_obj.start:pager_obj.end]
    html = pager_obj.page_html()
    return render(request,'hosts.html',{'host_list':host_list,"page_html":html})
"""

class Pagination(object):
    """
    自定义分页
    """
    def __init__(self,current_page,total_count,base_url,params,per_page_count=10,max_pager_count=11):
        try:
            current_page = int(current_page)
        except Exception as e:
            current_page = 1
        if current_page <=0:
            current_page = 1
        self.current_page = current_page
        # 数据总条数
        self.total_count = total_count

        # 每页显示10条数据
        self.per_page_count = per_page_count

        # 页面上应该显示的最大页码
        max_page_num, div = divmod(total_count, per_page_count)
        if div:
            max_page_num += 1
        self.max_page_num = max_page_num

        # 页面上默认显示11个页面（当前页在中间）
        self.max_pager_count = max_pager_count
        self.half_max_pager_count = int((max_pager_count - 1) / 2)

        # URL前缀
        self.base_url = base_url

        #request.GET
        import copy
        params=copy.deepcopy(params)
        params._mutable = True

        self.params=params
    @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

    def page_html(self):
        # 如果总页数 <= 11
        if self.max_page_num <= self.max_pager_count:
            pager_start = 1
            pager_end = self.max_page_num
        # 如果总页数 > 11
        else:
            # 如果当前页 <= 5
            if self.current_page <= self.half_max_pager_count:
                pager_start = 1
                pager_end = self.max_pager_count
            else:
                # 当前页 + 5 > 总页码
                if (self.current_page + self.half_max_pager_count) > self.max_page_num:
                    pager_end = self.max_page_num
                    pager_start = self.max_page_num - self.max_pager_count + 1
                else:
                    pager_start = self.current_page - self.half_max_pager_count
                    pager_end = self.current_page + self.half_max_pager_count

        page_html_list = []
        #首页
        self.params['page'] = 1
        first_page = '<a href="%s?%s">首页</a>'%(self.base_url,self.params.urlencode(),)
        page_html_list.append(first_page)
        #上一页
        self.params['page'] = self.current_page-1
        print(self.base_url)
        up_page = '<a href="%s?%s">上一页</a>'%(self.base_url,self.params.urlencode(),)
        page_html_list.append(up_page)
        for i in range(pager_start, pager_end + 1):

            self.params['page'] = i
            if i == self.current_page:
                temp = '<a class="active" href="%s?%s">%s</a>' % (self.base_url,self.params.urlencode(), i,)
            else:
                temp = '<a href="%s?%s">%s</a>' % (self.base_url,self.params.urlencode(), i,)
            page_html_list.append(temp)
        # 下一页
        self.params['page'] = self.current_page + 1
        print(self.base_url)
        up_page = '<a href="%s?%s">下一页</a>' % (self.base_url, self.params.urlencode(),)
        page_html_list.append(up_page)
        #尾页
        self.params['page'] = self.max_page_num
        last_page = '<a href="%s?%s">尾页</a>' %(self.base_url, self.params.urlencode(),)
        page_html_list.append(last_page)
        return ''.join(page_html_list)
#########view视图#############
from django.shortcuts import render,redirect
from pager import Pagination
# Create your views here.
HOST_LIST = []

for i in range(1,1464):
    HOST_LIST.append("ccc%s.com" %i)

def hosts(request):
    pager_obj = Pagination(request.GET.get('page', 1), len(HOST_LIST), request.path_info,request.GET)
    host_list = HOST_LIST[pager_obj.start:pager_obj.end]
    html = pager_obj.page_html()

    from django.http import QueryDict
    # request.GET是一个QueryDict类型，
    # 默认不可修改，request.GET._mutable = True
    # request.GET.urlencode() 用于讲k,v构造成URL格式字符串
    # request.GET['page'] = 666
    params = QueryDict(mutable=True)
    params['_list_filter'] = request.GET.urlencode()
    list_condition = params.urlencode()
    return render(request, 'hosts.html', {'host_list': host_list, "page_html": html,'list_condition':list_condition})
def edit(request,pk):
    if request.method == 'POST':
        url = "/host/?%s"%(request.GET.get('_list_filter'))
        return redirect(url)
    return render(request,'edit_host.html')
    # #当前页码
    # current_page = int(request.GET.get('page'))
    #
    # #每页显示的数据条数
    # per_page_count = 20
    #
    # #计算数据 作为分割条件
    # start = (current_page - 1) * per_page_count
    # end = current_page * per_page_count
    # host_list = HOST_LIST[start:end]
    #
    # #数据的总条数
    # total_count = len(HOST_LIST)
    #
    # #页面应该显示的最大页码
    # max_page_num,div=divmod(total_count,per_page_count)
    # if div:
    #     max_page_num+=1
    # page_html_list = []
    # for i in range(1,max_page_num+1):
    #     if i == current_page:
    #         temp = '<a class="active" href="/host/?page=%s">%s</a>' % (i, i,)
    #     else:
    #         temp='<a href="/host/?page=%s">%s</a>'%(i,i,)
    #
    #     page_html_list.append(temp)
    # page_list = ''.join(page_html_list)
    # return render(request,'hosts.html',{'host_list':host_list,'page_html':page_list})
#########HTML页面###############
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .pager a{
            display: inline-block;
            padding: 2px 8px;
            margin: 0 5px;
            border: 1px solid cadetblue;
        }
        .pager a.active{
            background-color: #2b669a;
            color: white;
        }
    </style>
</head>
<body>
<ul>
    {% for item in host_list %}
    <li>{{ item }}<a href="/edit/{{ forloop.counter }}/?{{ list_condition }}">编辑</a></li>
    {% endfor %}

</ul>
<div class="pager">
    {{ page_html|safe }}
</div>
</body>
</html>
###########编辑页面##########################
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <form method="post">
        {% csrf_token %}
        <input type="text">
        <input type="submit" value="提交">
    </form>
</body>
</html>