一.分页逻辑
from django.utils.safestring import mark_safe #mark_safe：安全字符串
class MyPage:
def __init__(self, page_num, page_num_count, req_path, per_page_num, page_num_show):
self.page_num = page_num
self.page_num_count = page_num_count
self.req_path = req_path
self.per_page_num = per_page_num # 每页显示多少条数据
self.page_num_show = page_num_show # 显示的页码数
# 如果有异常就默认当前页
try:
self.page_num = int(self.page_num)
except Exception:
self.page_num = 1
# 计算有多少页 如果商不为0页数就加一 总的页码数
a, b = divmod(self.page_num_count, self.per_page_num)
if b:
self.page_num_count = a + 1
else:
self.page_num_count = a
# 如果小于1就让他去当前页，大于总页数就让他去最后一页
if self.page_num <= 0:
self.page_num = 1
elif self.page_num >= self.page_num_count:
self.page_num = self.page_num_count
# 每页展示的页码数
half_show = self.page_num_show // 2 # 2
if self.page_num - half_show <= 0:
start_page_num = 1
end_page_num = self.page_num_show + 1
elif self.page_num + half_show >= self.page_num_count:
start_page_num = self.page_num_count - self.page_num_show + 1
end_page_num = self.page_num_count + 1
else:
start_page_num = self.page_num - half_show # 3
end_page_num = self.page_num + half_show + 1 # 7
self.start_page_num = start_page_num
self.end_page_num = end_page_num
# 每页显示多少条数据 开始
@property
def start_data_num(self):
return (self.page_num - 1) * self.per_page_num
# 每页显示多少条数据 结束
@property
def end_data_num(self):
return self.page_num * self.per_page_num
# 前端页码
def page_html(self):
page_num_range = range(self.start_page_num, self.end_page_num)
page_html = ''
# 上一页
if self.page_num <= 1:
page_pre_html = f'''
<nav aria-label="Page navigation">
<ul class="pagination">
<li class="disabled">
<a href="{self.req_path}?page={1}" aria-label="Previous">
<span aria-hidden="true">首页</span>
</a>
<a href="javascript:void(0)" aria-label="Previous">
<span aria-hidden="true">«</span>
</a>
</li>
'''
else:
page_pre_html = f'''
<nav aria-label="Page navigation">
<ul class="pagination">
<li>
<a href="{self.req_path}?page={1}" aria-label="Previous">
<span aria-hidden="true">首页</span>
</a>
<a href="{self.req_path}?page={self.page_num - 1}" aria-label="Previous">
<span aria-hidden="true">«</span>
</a>
</li>
'''
page_html += page_pre_html
# 页码标签 并且有选中状态
for i in page_num_range:
if i == self.page_num:
page_html += f'<li class="active"><a href="{self.req_path}?page={i}">{i}</a></li>'
else:
page_html += f'<li><a href="{self.req_path}?page={i}">{i}</a></li>'
# 下一页
if self.page_num >= self.page_num_count:
page_next_html = f'''
<li class="disabled">
<a href="javascript:void(0)" aria-label="Next">
<span aria-hidden="true">»</span>
</a>
<a href="{self.req_path}?page={self.page_num_count}" aria-label="Next">
<span aria-hidden="true">尾页</span>
</a>
</li>
</ul>
</nav>
'''
else:
page_next_html = f'''
<li>
<a href="{self.req_path}?page={self.page_num + 1}" aria-label="Next">
<span aria-hidden="true">»</span>
</a>
<a href="{self.req_path}?page={self.page_num_count}" aria-label="Next">
<span aria-hidden="true">尾页</span>
</a>
</li>
</ul>
</nav>
'''
page_html += page_next_html
return mark_safe(page_html)
二.首页逻辑
def index(request):
# 当前页
page_num = request.GET.get('page')
# 获取路径
req_path = request.path_info
# 计算有多少条数据
page_num_count = app04.models.Customer.objects.all().count()
#settings中封装的页码数和每页显示多少条数据
per_page_num = settings.PER_PAGE_NUM # 每页显示多少条数据
page_num_show = settings.PAGE_NUM_SHOW # 显示的页码数
#封装的分页组件
page_obj = MyPage(page_num,page_num_count,req_path,per_page_num,page_num_show)
page_html = page_obj.page_html()
# 获取所有的数据
index_obj = app04.models.Index.objects.all()[page_obj.start_data_num:page_obj.end_data_num]
return render(request, 'crm/index.html', {'index_obj': index_obj,'page_html':page_html})
直接拿去用就行…