目录
- ajax结合sweetalert使用
- bulk_create批量插入数据
- 自定义分页器
ajax结合sweetalert使用
点击下载Bootstrap-sweetalert
一通CV大法:
Title
{% load static %}
这里有个问题,发现汉字被挡住了。。。
通过谷歌浏览器的检查,查看html元素修改,加上样式即可:
最终的实例:
Title
{% load static %}
后端views.py
def home(request):
if request.is_ajax():
back_dic = {'code': 1000, 'msg': ''}
delete_id = request.POST.get('delete_id')
time.sleep(3)
models.User.objects.filter(pk=delete_id).delete()
back_dic['msg'] = '数据已经被我删掉了'
return JsonResponse(back_dic)
user_queryset = models.User.objects.all()
return render(request, 'home.html', locals())
bulk_create批量插入数据
在django向数据库插入多条数据, 按照原本最笨的方法:
def index(request):
for i in range(1000):
models.Book.objects.create(title=f'第{i}本书')
这种插入方式很耗时间,对数据库的压力也很大
使用bulk_create 方法 批量插入数据:
def index(request):
book_list = []
for i in range(10000):
book_list.append(models.Book(title=f'第{i}本书'))
models.Book.objects.bulk_create(book_list)
book_queryset = models.Book.objects.all()
return render(request, 'index.html', locals())
自定义分页器
分页器组件
class Pagination(object):
def __init__(self,current_page,all_count,per_page_num=2,pager_count=11):
"""
封装分页相关数据
:param current_page: 当前页
:param all_count: 数据库中的数据总条数
:param per_page_num: 每页显示的数据条数
:param pager_count: 最多显示的页码个数
用法:
queryset = model.objects.all()
page_obj = Pagination(current_page,all_count)
page_data = queryset[page_obj.start:page_obj.end]
获取数据用page_data而不再使用原始的queryset
获取前端分页样式用page_obj.page_html
"""
try:
current_page = int(current_page)
except Exception as e:
current_page = 1
if current_page <1:
current_page = 1
self.current_page = current_page
self.all_count = all_count
self.per_page_num = per_page_num
# 总页码
all_pager, tmp = divmod(all_count, per_page_num)
if tmp:
all_pager += 1
self.all_pager = all_pager
self.pager_count = pager_count
self.pager_count_half = int((pager_count - 1) / 2)
@property
def start(self):
return (self.current_page - 1) * self.per_page_num
@property
def end(self):
return self.current_page * self.per_page_num
def page_html(self):
# 如果总页码 < 11个:
if self.all_pager <= self.pager_count:
pager_start = 1
pager_end = self.all_pager + 1
# 总页码 > 11
else:
# 当前页如果<=页面上最多显示11/2个页码
if self.current_page <= self.pager_count_half:
pager_start = 1
pager_end = self.pager_count + 1
# 当前页大于5
else:
# 页码翻到最后
if (self.current_page + self.pager_count_half) > self.all_pager:
pager_end = self.all_pager + 1
pager_start = self.all_pager - self.pager_count + 1
else:
pager_start = self.current_page - self.pager_count_half
pager_end = self.current_page + self.pager_count_half + 1
page_html_list = []
# 添加前面的nav和ul标签
page_html_list.append('''
''')
return ''.join(page_html_list)
使用方法:
在app应用下先建utils文件夹,在utils下先建mypage.py
,复制上述的分页器代码
在views.py中:
from app01.utils.mypage import Pagination
def index(request):
book_queryset = models.Book.objects.all() # 你想要分页展示的数据
current_page = request.GET.get('page', 1) # 获取当前页
all_count = book_queryset.count() # 统计数据的总条数
page_obj = Pagination(current_page=current_page, all_count=all_count, per_page_num=10, pager_count=5) # 生成一个分页器对象
page_queryset = book_queryset[page_obj.start:page_obj.end]
return render(request, 'index.html', locals())
前端:
{% for book in book_queryset %}
{{ book }}
{% endfor %}
{{ page_obj.page_html|safe }}