django之分页、cookie装饰器

时间:2022-09-07 09:54:44

一、分页代码如下

from django.utils.safestring import mark_safe

class Page:
def __init__(self, current_page, data_count, per_page_count=10, pager_num=7):
self.current_page = current_page
self.data_count = data_count
self.per_page_count = per_page_count
self.pager_num = pager_num @property
def start(self):
return (self.current_page - 1) * self.per_page_count @property
def end(self):
return self.current_page * self.per_page_count @property
def total_count(self):
v, y = divmod(self.data_count, self.per_page_count)
if y:
v += 1
return v def page_str(self, base_url):
page_list = [] if self.total_count < self.pager_num:
start_index = 1
end_index = self.total_count + 1
else:
if self.current_page <= (self.pager_num + 1) / 2:
start_index = 1
end_index = self.pager_num + 1
else:
start_index = self.current_page - (self.pager_num - 1) / 2
end_index = self.current_page + (self.pager_num + 1) / 2
if (self.current_page + (self.pager_num - 1) / 2) > self.total_count:
end_index = self.total_count + 1
start_index = self.total_count - self.pager_num + 1 if self.current_page == 1:
prev = '<a class="page" href="javascript:void(0);">上一页</a>'
else:
prev = '<a class="page" href="%s?p=%s">上一页</a>' % (base_url, self.current_page - 1,)
page_list.append(prev) for i in range(int(start_index), int(end_index)):
if i == self.current_page:
temp = '<a class="page active" href="%s?p=%s">%s</a>' % (base_url, i, i)
else:
temp = '<a class="page" href="%s?p=%s">%s</a>' % (base_url, i, i)
page_list.append(temp) if self.current_page == self.total_count:
nex = '<a class="page" href="javascript:void(0);">下一页</a>'
else:
nex = '<a class="page" href="%s?p=%s">下一页</a>' % (base_url, self.current_page + 1,)
page_list.append(nex) jump = """
<input type='text' /><a onclick='jumpTo(this, "%s?p=");'>GO</a>
<script>
function jumpTo(ths,base){
var val = ths.previousSibling.value;
location.href = base + val;
}
</script>
""" % (base_url,) page_list.append(jump) page_str = mark_safe("".join(page_list)) return page_str

django分页后台代码

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
<style>
.pagination .page{
display: inline-block;
padding: 5px;
background-color: cyan;
margin: 5px;
}
.pagination .page.active{
background-color: brown;
color: white;
}
</style>
</head>
<body>
<ul>
{% for item in li %}
{% include 'li.html' %}
{% endfor %}
</ul> <div>
<select id="ps" onchange="changePageSize(this)">
<option value="10">10</option>
<option value="30">30</option>
<option value="50">50</option>
<option value="100">100</option>
</select>
</div> <div class="pagination">
{{ page_str }}
</div>
<script src="/static/jquery-1.12.4.js"></script>
<script src="/static/jquery.cookie.js"></script>
<script> $(function(){
var v = $.cookie('per_page_count', {'path': "/user_list/`"});
$('#ps').val(v);
}); function changePageSize(ths){
var v = $(ths).val();
console.log(v);
$.cookie('per_page_count',v, {'path': "/user_list/"}); location.reload();
}
</script>
</body>
</html>

user_list.html

/* li.html */
<li>{{ item }}</li>

views.py文件

from  utils import pagination
LIST = []
for i in range(500):
LIST.append(i) def user_list(request):
current_page = request.GET.get('p', 1)
current_page = int(current_page) val = request.COOKIES.get('per_page_count',10)
val = int(val)
page_obj = pagination.Page(current_page,len(LIST),val) data = LIST[page_obj.start:page_obj.end] page_str = page_obj.page_str("/user_list/") return render(request, 'user_list.html', {'li': data,'page_str': page_str})

二、cookie使用

Cookie 是由 Web 服务器保存在用户浏览器(客户端)上的小文本文件,它可以包含有关用户的信息;cookie的内容主要包括:名字,值,过期时间,路径和域。

1、获取Cookie:

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request.COOKIES['key']
request.get_signed_cookie(key, default=RAISE_ERROR, salt='', max_age=None)
    参数:
        default: 默认值
           salt: 加密盐
        max_age: 后台控制过期时间

2、设置Cookie:

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rep = HttpResponse(...) 或 rep = render(request, ...)
 
rep.set_cookie(key,value,...)
rep.set_signed_cookie(key,value,salt='加密盐',...)
    参数:
        key,              键
        value='',         值
        max_age=None,     超时时间
        expires=None,     超时时间(IE requires expires, so set it if hasn't been already.)
        path='/',         Cookie生效的路径,/ 表示根路径,特殊的:跟路径的cookie可以被任何url的页面访问
        domain=None,      Cookie生效的域名
        secure=False,     https传输
        httponly=False    只能http协议传输,无法被JavaScript获取(不是绝对,底层抓包可以获取到也可以被覆盖)

由于cookie保存在客户端的电脑上,所以,JavaScript和jquery也可以操作cookie。

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<script src='/static/js/jquery.cookie.js'></script>
$.cookie("list_pager_num"30,{ path: '/' });

实例:

def auth(func):
''' 装饰登录判断是否存在cookie
'''
def inner(request, *args, **kwargs):
try:
#获取加盐cookie
v = request.get_signed_cookie('NID', salt='dwadwadwa')
if not v:
return redirect('/login/')
except Exception as e:
return redirect('/login/')
return func(request, *args, **kwargs)
return inner from django.utils.decorators import method_decorator
from django import views class Order1(views.View):
"""
方法一
CBV --> class Base view
"""
@method_decorator(auth)
def get(self,request):
redirect_to = settings.LOGIN_REDIRECT_URL
res = redirect(redirect_to)
res.set_signed_cookie('NID', 'user', salt="dwadwadwa")
return res
@method_decorator(auth)
def post(self,request):
redirect_to = settings.LOGIN_REDIRECT_URL
res = redirect(redirect_to)
res.set_signed_cookie('NID', 'user', salt="dwadwadwa")
return res
class Order2(views.View):
"""
方法二
CBV --> class Base view
"""
@method_decorator(auth)
def dispatch(self, request, *args, **kwargs):
return super(Order2,self).dispatch(request,*args,**kwargs) def get(self,request):
redirect_to = settings.LOGIN_REDIRECT_URL
res = redirect(redirect_to)
res.set_signed_cookie('NID', 'user', salt="dwadwadwa")
return res def post(self,request):
redirect_to = settings.LOGIN_REDIRECT_URL
res = redirect(redirect_to)
res.set_signed_cookie('NID', 'user', salt="dwadwadwa")
return res @method_decorator(auth,name='dispatch')
class Order3(views.View):
"""
推荐使用:方法三
CBV --> class Base view
""" def get(self,request):
redirect_to = settings.LOGIN_REDIRECT_URL
res = redirect(redirect_to)
res.set_signed_cookie('NID', 'user', salt="dwadwadwa")
return res def post(self,request):
redirect_to = settings.LOGIN_REDIRECT_URL
res = redirect(redirect_to)
res.set_signed_cookie('NID', 'user', salt="dwadwadwa")
return res def login(request):
"""
FBV --> func Base view
"""
redirect_to = settings.LOGIN_REDIRECT_URL
if request.method == "GET":
return render(request, 'login.html')
if request.method == "POST":
user = request.POST.get('username')
passwd = request.POST.get('password')
obj = models.Usertype.objects.filter(username=user,password=passwd).first()
if obj:
res = redirect(redirect_to)
"""
登录成功设置cookie
"""
res.set_signed_cookie('NID', user, salt="dwadwadwa")
return res
else:
return render(request, 'login.html', {'password_is_wrong': True})

django cookie FBV&CBV使用方法

三、模块继承

模板中也有自己的语言,该语言可以实现数据展示

    • {{ item }}
    • {% for item in item_list %}  <a>{{ item }}</a>  {% endfor %}
        forloop.counter
        forloop.first
        forloop.last
    • {% if ordered_warranty %}  {% else %} {% endif %}
    • 母板:{% block title %}{% endblock %}
      子板:{% extends "base.html" %}
         {% block title %}{% endblock %}

实例:

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>{% block title %} {% endblock %}</title>
<link rel="stylesheet" href="/static/commons.css" />
<style>
.pg-header{
height: 50px;
background-color: seashell;
color: green;
}
</style>
{% block css %} {% endblock %}
</head>
<body>
<div class="pg-header">小男孩管理</div>
<div>
<a>asdf</a>
<a id="">asdf</a>
<a>asdf</a>
<a>asdf</a>
<a>asdf</a>
</div>
<iframe src="/"></iframe>
</body>
</html>

master.html

{% extends 'master.html' %}

{% block title %}用户管理{% endblock %}

{% block content %}
<h1>用户管理</h1>
<ul>
{% for i in u %}
<li>{{ i }}</li>
{% endfor %}
</ul> {% for i in u %}
{% include 'tag.html' %}
{% endfor %} {% endblock %} {% block css %}
<style>
body{
background-color: red;
}
</style>
{% endblock %} {% block js %}
<script></script>
{% endblock %}

tp1.html

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