一次编写,多次使用
"""
@Author: xiaozhi
@Email: [email protected]
@FileName: pagination.py
@DateTime: 2022/5/27
@SoftWare: PyCharm
"""
"""
自定义分页组件
如想再次使用,需做如下几件事:
在视图函数中:
from xxx import 脚本文件 # 导入
def pretty_list(request):
# 1. 根据自己的情况去筛选自己的数据
queryset = models.PrettyNum.objects.all()
# 2. 实例化分页对象
page_object = Pagination(request, queryset)
page_queryset = page_object.page_queryset # 分完页的数据
page_string = page_object.html() # 页码
context = {
"search_data": search_data,
"queryset": page_queryset, # 分完页的数据
"page_string": page_string, # 页码
}
return render(request, "pretty_list.html", context)
在HTML页面中:
{% for obj in queryset %}
{
{ obj.xx }}
{% endfor %}
<ul class="pagination">
{
{ page_string }}
</ul>
"""
"""
分页时,保留原来的搜索条件
"""
from django.utils.safestring import mark_safe
import copy
class Pagination(object):
def __init__(self, request, queryset, page_size=10, page_param="page", plus=5):
"""
:param request: 请求的对象
:param queryset: 符合条件的数据(根据这个数据给他进行分页处理)
:param page_size: 每页显示多少条数据
:param page_param: 在URL中传递的获取分页的参数,例如:/pretty/list/?page=1
:param plus: 显示当前页的前或后几页(根据页码得来)
"""
# 搜索之后分页,条件
query_dict = copy.deepcopy(request.GET)
# request.GET可以获取URL中所有的参数,request.GET.urlencode()可以将参数拼接为URL,如:q=123&xx=111&bb=222
# request.GET._mutable=True, 修改为True,可以拼接参数,可以在from django.http.request import QueryDict中查看源码
query_dict._mutable = True
self.query_dict = query_dict
self.page_param = page_param
page = request.GET.get(page_param, "1")
if page.isdecimal():
page = int(page)
else:
page = 1
self.page = page
self.page_size = page_size
self.start = (page - 1) * page_size
self.end = page * page_size
self.page_queryset = queryset[self.start:self.end]
total_count = queryset.count() # 数据总条数
total_page_count, div = divmod(total_count, page_size)
if div:
total_page_count += 1
self.total_page_count = total_page_count
self.plus = plus
def html(self):
# 计算出,显示当前也的前5页和后5页
# 数据库中的数据比较少,没有达到11页
if self.total_page_count <= 2 * self.plus + 1:
start_page = 1
end_page = self.total_page_count
# 数据库中的数据比较多,大于11页
else:
# 当前页<5时(小极值)
if self.page <= self.plus:
start_page = 1
end_page = 2 * self.plus
# 当前页>5时(大极值)
else:
# 当前页 + 5 > 总页码
if (self.page + self.plus) > self.total_page_count:
start_page = self.total_page_count - 2 * self.plus
end_page = self.total_page_count
else:
start_page = self.page - self.plus
end_page = self.page + self.plus
# 页码
page_str_list = []
self.query_dict.setlist(self.page_param, [1])
# 首页
page_str_list.append('<li><a href="?{}">首页</a></li>'.format(self.query_dict.urlencode()))
# 上一页
if self.page > 1:
self.query_dict.setlist(self.page_param, [self.page - 1])
prev = '<li><a href="?{}">上一页</a></li>'.format(self.query_dict.urlencode())
else:
self.query_dict.setlist(self.page_param, [1])
prev = '<li><a href="?{}">上一页</a></li>'.format(self.query_dict.urlencode())
page_str_list.append(prev)
# 页面
for i in range(start_page, end_page + 1):
self.query_dict.setlist(self.page_param, [i])
if i == self.page:
ele = '<li class="active"><a href="?{}">{}</a></li>'.format(self.query_dict.urlencode(), i)
else:
ele = '<li><a href="?{}">{}</a></li>'.format(self.query_dict.urlencode(), i)
page_str_list.append(ele)
# page_string = "".join(page_str_list) # page_string是字符串,需要使用mark_safe()转换一下,如下
# 下一页
if self.page < self.total_page_count:
self.query_dict.setlist(self.page_param, [self.page + 1])
prev = '<li><a href="?{}">下一页</a></li>'.format(self.query_dict.urlencode())
else:
self.query_dict.setlist(self.page_param, [self.total_page_count])
prev = '<li><a href="?{}">下一页</a></li>'.format(self.query_dict.urlencode())
page_str_list.append(prev)
# 尾页
self.query_dict.setlist(self.page_param, [self.total_page_count])
page_str_list.append('<li><a href="?{}">尾页</a></li>'.format(self.query_dict.urlencode()))
search_string = """
<li>
<form style="float: left;margin-left: -1px" method="get">
<input name="page"
style="position: relative;float:left;display: inline-block;width: 80px;border-radius: 0;"
type="text" class="form-control" placeholder="页码">
<button style="border-radius: 0" class="btn btn-default" type="submit">跳转</button>
</form>
</li>
"""
page_str_list.append(search_string)
page_string = mark_safe("".join(page_str_list))
return page_string