分页功能组件开发
""""
自定义分页组件，之后如果想使用这个分页组件，你需要做如下的事情：
在视图函数中：
def mobile_list(request):
# 1. 筛选自的情况去筛选自己的数据
queryset = models.MobileInfo.objects.filter。all()
# 2. 实例化分页对象
page_object = Pagination(request,queryset)
context = {
'queryset': page_object.page_queryset, # 分完页的数据
"page_string": page_object.html() # 生成所有的页码
}
return render(request, 'mobile_list.html', context)
在HTML页面中进行如下编写
// 数据的循环展示
{% for obj in queryset %}
{{ obj.id }}
{% endfor %}
// 页码的展示
<ul class="pagination">
{{ page_string }}
</ul>
"""
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: 请求对象
:param queryset: 查询数据（根据此进行分页）
:param page_size: 每页多少条数据
:param page_param: URL 参数中的分页参数
:param plus: 当前页前后显示几页
"""
query_dict = copy.deepcopy(request.GET)
query_dict.mutable = True
self.query_dict = query_dict
self.params = page_param
page = request.GET.get(page_param, 1)
if str(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:min(self.end, len(queryset))]
# 计算总页数
total_count = queryset.count()
self.total_page_count = (total_count + page_size - 1) // page_size
self.plus = plus
# # 总页码
# total_count = queryset.count()
# total_page_count, div = divmod(total_count, page_size) ## divmod返回商和余数
# if div:
# total_page_count += 1
# self.total_page_count = total_page_count
# self.plus = plus
def html(self):
# 计算页码区间
if self.total_page_count <= 2 * self.plus + 1:
start_page = 1
end_page = self.total_page_count
else:
if self.page <= self.plus:
start_page = 1
end_page = 2 * self.plus + 1
else:
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
# 页码生成
page_str_list = []
self.query_dict.setlist(self.params, [1])
prev = f'<li><a href="?{self.query_dict.urlencode()}">首页</a></li>'
page_str_list.append(prev)
# 上一页
if self.page > 1:
self.query_dict.setlist(self.params, [self.page - 1])
prev = f'<li><a href="?{self.query_dict.urlencode()}">上一页</a></li>'
else:
self.query_dict.setlist(self.params, [1])
prev = f'<li><a href="?{self.query_dict.urlencode()}">上一页</a></li>'
page_str_list.append(prev)
# 页码
for i in range(start_page, end_page + 1):
self.query_dict.setlist(self.params, [i])
if i == self.page:
ele = f'<li class="active"><a href="?{self.query_dict.urlencode()}">{i}</a></li>'
else:
ele = f'<li><a href="?{self.query_dict.urlencode()}">{i}</a></li>'
page_str_list.append(ele)
# 下一页
if self.page < self.total_page_count:
self.query_dict.setlist(self.params, [self.page + 1])
prev = f'<li><a href="?{self.query_dict.urlencode()}">下一页</a></li>'
else:
self.query_dict.setlist(self.params, [end_page])
prev = f'<li><a href="?{self.query_dict.urlencode()}">下一页</a></li>'
page_str_list.append(prev)
# 尾页
self.query_dict.setlist(self.params, [self.total_page_count])
prev = f'<li><a href="?{self.query_dict.urlencode()}">尾页</a></li>'
page_str_list.append(prev)
page_string = mark_safe("".join(page_str_list))
return page_string
""""
自定义分页组件，之后如果想使用这个分页组件，你需要做如下的事情：
在视图函数中：
def mobile_list(request):
# 1. 筛选自的情况去筛选自己的数据
queryset = models.MobileInfo.objects.filter。all()
# 2. 实例化分页对象
page_object = Pagination(request,queryset)
context = {
'queryset': page_object.page_queryset, # 分完页的数据
"page_string": page_object.html() # 生成所有的页码
}
return render(request, 'mobile_list.html', context)
在HTML页面中进行如下编写
// 数据的循环展示
{% for obj in queryset %}
{{ obj.id }}
{% endfor %}
// 页码的展示
<ul class="pagination">
{{ page_string }}
</ul>
"""
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: 请求对象
:param queryset: 查询数据（根据此进行分页）
:param page_size: 每页多少条数据
:param page_param: URL 参数中的分页参数
:param plus: 当前页前后显示几页
"""
query_dict = copy.deepcopy(request.GET)
query_dict.mutable = True
self.query_dict = query_dict
self.params = page_param
page = request.GET.get(page_param, 1)
if str(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:min(self.end, len(queryset))]
# 计算总页数
total_count = queryset.count()
self.total_page_count = (total_count + page_size - 1) // page_size
self.plus = plus
# # 总页码
# total_count = queryset.count()
# total_page_count, div = divmod(total_count, page_size) ## divmod返回商和余数
# if div:
# total_page_count += 1
# self.total_page_count = total_page_count
# self.plus = plus
def html(self):
# 计算页码区间
if self.total_page_count <= 2 * self.plus + 1:
start_page = 1
end_page = self.total_page_count
else:
if self.page <= self.plus:
start_page = 1
end_page = 2 * self.plus + 1
else:
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
# 页码生成
page_str_list = []
self.query_dict.setlist(self.params, [1])
prev = f'<li><a href="?{self.query_dict.urlencode()}">首页</a></li>'
page_str_list.append(prev)
# 上一页
if self.page > 1:
self.query_dict.setlist(self.params, [self.page - 1])
prev = f'<li><a href="?{self.query_dict.urlencode()}">上一页</a></li>'
else:
self.query_dict.setlist(self.params, [1])
prev = f'<li><a href="?{self.query_dict.urlencode()}">上一页</a></li>'
page_str_list.append(prev)
# 页码
for i in range(start_page, end_page + 1):
self.query_dict.setlist(self.params, [i])
if i == self.page:
ele = f'<li class="active"><a href="?{self.query_dict.urlencode()}">{i}</a></li>'
else:
ele = f'<li><a href="?{self.query_dict.urlencode()}">{i}</a></li>'
page_str_list.append(ele)
# 下一页
if self.page < self.total_page_count:
self.query_dict.setlist(self.params, [self.page + 1])
prev = f'<li><a href="?{self.query_dict.urlencode()}">下一页</a></li>'
else:
self.query_dict.setlist(self.params, [end_page])
prev = f'<li><a href="?{self.query_dict.urlencode()}">下一页</a></li>'
page_str_list.append(prev)
# 尾页
self.query_dict.setlist(self.params, [self.total_page_count])
prev = f'<li><a href="?{self.query_dict.urlencode()}">尾页</a></li>'
page_str_list.append(prev)
page_string = mark_safe("".join(page_str_list))
return page_string