view层
def fenye(request):
all_data = models.AuthorDetail.objects.all()
current_page = request.GET.get('page',1)
count = all_data.count()
page_obj = Pagination(current_page=current_page,all_count=count)
data = all_data[page_obj.start:page_obj.end]
return render(request,'fenye.html',locals())模板层
{% for a in data %}
<p>{{ a.addr }}</p>
{% endfor %}
{{ page_obj.page_html|safe }}自定义分页器
class Pagination(object):
def __init__(self, current_page, all_count, per_page_num=10, 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('''
<nav aria-label='Page navigation>'
<ul class='pagination'>
''')
first_page = '<li><a href="?page=%s">首页</a></li>' % (1)
page_html_list.append(first_page)
if self.current_page <= 1:
prev_page = '<li class="disabled"><a href="#">上一页</a></li>'
else:
prev_page = '<li><a href="?page=%s">上一页</a></li>' % (self.current_page - 1,)
page_html_list.append(prev_page)
for i in range(pager_start, pager_end):
if i == self.current_page:
temp = '<li class="active"><a href="?page=%s">%s</a></li>' % (i, i,)
else:
temp = '<li><a href="?page=%s">%s</a></li>' % (i, i,)
page_html_list.append(temp)
if self.current_page >= self.all_pager:
next_page = '<li class="disabled"><a href="#">下一页</a></li>'
else:
next_page = '<li><a href="?page=%s">下一页</a></li>' % (self.current_page + 1,)
page_html_list.append(next_page)
last_page = '<li><a href="?page=%s">尾页</a></li>' % (self.all_pager,)
page_html_list.append(last_page)
# 尾部添加标签
page_html_list.append('''
</nav>
</ul>
''')
return ''.join(page_html_list)由于校验的安全性，前端可以没有校验，但是后端必须校验
username = forms.CharField(min_length=3, max_length=8, label='用户名',
error_messages={
'min_length': '用户名最短三位',
'max_length': '用户名最长八位',
'required': '用户名不能为空'
}, initial='我是初始值', required=False)
password = forms.CharField(min_length=3, max_length=8, label='密码',
error_messages={
'min_length': '密码最短三位',
'max_length': '密码最长八位',
'required': '密码不能为空'
})
email = forms.EmailField(label='邮箱',
error_messages={
'required': '邮箱不能为空',
'invalid': '邮箱格式不正确'
}, required=False)#可以为空
def fenye(request):
from_obj = MyForm()
if request.method == 'POST':
from_obj = MyForm(request.POST)
print(from_obj.errors)
if from_obj.is_valid():
return HttpResponse("数据没有问题")
return render(request, 'fenye.html', locals())
注意这些函数都要写在form类中
局部钩子函数
给部分字段加强校验
def clean_username(self):
username = self.cleaned_data.get('username')
if '88' in username:
self.add_error('username','名字不能包含88')
return username全局钩子函数
针对多个字段校验使用全局钩子函数
def clean(self):
password = self.cleaned_data.get('password')
re_password = self.cleaned_data.get('re_password')
if not password == re_password:
self.add_error('re_password','密码不相等啊')
return self.cleaned_data#
# phone = forms.CharField(label='手机号',validators=[RegexValidator(r'^[0-9]+$', '请输入数字'), RegexValidator(r'^159[0-9]+$', '数字必须以159开头')])
#
#
#
# """下面的是了解知识点 你只需要整理到你的博客中 到时候需要用 直接来拷贝即可"""
#
# gender = forms.ChoiceField(
# choices=((1, "男"), (2, "女"), (3, "保密")),
# label="性别",
# initial=3,
# widget=widgets.RadioSelect()
# )
#
#
#
#
# hobby = forms.ChoiceField(
# choices=((1, "篮球"), (2, "足球"), (3, "双色球"),),
# label="爱好",
# initial=3,
# widget=widgets.Select()
# )
#
# hobby1 = forms.MultipleChoiceField(
# choices=((1, "篮球"), (2, "足球"), (3, "双色球"),),
# label="爱好",
# initial=[1, 3],
# widget=widgets.SelectMultiple()
# )
#
# keep = forms.ChoiceField(
# label="是否记住密码",
# initial="checked",
# widget=forms.widgets.CheckboxInput()
# )
#
# hobby2 = forms.MultipleChoiceField(
# choices=((1, "篮球"), (2, "足球"), (3, "双色球"),),
# label="爱好",
# initial=[1, 3],
# widget=forms.widgets.CheckboxSelectMultiple()
# )
原文：https://www.cnblogs.com/zx125/p/11762296.html