django之分页、cookie装饰器

一、分页代码如下

from django.utils.safestring importmark_safeclassPage:def __init__(self, current_page, data_count, per_page_count=10, pager_num=7):self.current_page=current_pageself.data_count=data_countself.per_page_count=per_page_countself.pager_num=pager_num@propertydefstart(self):return (self.current_page - 1) *self.per_page_count@propertydefend(self):return self.current_page *self.per_page_count@propertydeftotal_count(self):v, y=divmod(self.data_count, self.per_page_count)ify:v+= 1returnvdefpage_str(self, base_url):page_list=[]if self.total_count <self.pager_num:start_index= 1end_index= self.total_count + 1else:if self.current_page <= (self.pager_num + 1) / 2:start_index= 1end_index= self.pager_num + 1else:start_index= self.current_page - (self.pager_num - 1) / 2end_index= self.current_page + (self.pager_num + 1) / 2if (self.current_page + (self.pager_num - 1) / 2) >self.total_count:end_index= self.total_count + 1start_index= self.total_count - self.pager_num + 1if 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 inrange(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 οnclick='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>
<htmllang="en">
<head><metacharset="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><selectid="ps"onchange="changePageSize(this)"><optionvalue="10">10</option><optionvalue="30">30</option><optionvalue="50">50</option><optionvalue="100">100</option></select></div><divclass="pagination">{{ page_str }}</div><scriptsrc="/static/jquery-1.12.4.js"></script><scriptsrc="/static/jquery.cookie.js"></script><script>$(function(){varv=$.cookie('per_page_count', {'path':"/user_list/`"});$('#ps').val(v);});functionchangePageSize(ths){varv=$(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 importpagination
LIST=[]for i in range(500):LIST.append(i)defuser_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：

                                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：

                                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。

1 2	`<script src='/static/js/jquery.cookie.js'></script>` `$.cookie("list_pager_num",` `30,{ path:` `'/'` `});`

实例：

defauth(func):'''装饰登录判断是否存在cookie'''def inner(request, *args, **kwargs):try:#获取加盐cookiev = request.get_signed_cookie('NID', salt='dwadwadwa')if notv:return redirect('/login/')exceptException as e:return redirect('/login/')return func(request, *args, **kwargs)returninnerfrom django.utils.decorators importmethod_decoratorfrom django importviewsclassOrder1(views.View):"""方法一CBV --> class Base view"""@method_decorator(auth)defget(self,request):redirect_to=settings.LOGIN_REDIRECT_URLres=redirect(redirect_to)res.set_signed_cookie('NID', 'user', salt="dwadwadwa")returnres@method_decorator(auth)defpost(self,request):redirect_to=settings.LOGIN_REDIRECT_URLres=redirect(redirect_to)res.set_signed_cookie('NID', 'user', salt="dwadwadwa")returnresclassOrder2(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)defget(self,request):redirect_to=settings.LOGIN_REDIRECT_URLres=redirect(redirect_to)res.set_signed_cookie('NID', 'user', salt="dwadwadwa")returnresdefpost(self,request):redirect_to=settings.LOGIN_REDIRECT_URLres=redirect(redirect_to)res.set_signed_cookie('NID', 'user', salt="dwadwadwa")returnres@method_decorator(auth,name='dispatch')classOrder3(views.View):"""推荐使用:方法三CBV --> class Base view"""defget(self,request):redirect_to=settings.LOGIN_REDIRECT_URLres=redirect(redirect_to)res.set_signed_cookie('NID', 'user', salt="dwadwadwa")returnresdefpost(self,request):redirect_to=settings.LOGIN_REDIRECT_URLres=redirect(redirect_to)res.set_signed_cookie('NID', 'user', salt="dwadwadwa")returnresdeflogin(request):"""FBV --> func Base view"""redirect_to=settings.LOGIN_REDIRECT_URLif 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()ifobj:res=redirect(redirect_to)"""登录成功设置cookie"""res.set_signed_cookie('NID', user, salt="dwadwadwa")returnreselse: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>
<htmllang="en">
<head><metacharset="UTF-8"><title>{% block title %} {% endblock %}</title><linkrel="stylesheet"href="/static/commons.css" /><style>.pg-header{height:50px;background-color:seashell;color:green;}</style>{% block css %} {% endblock %}</head>
<body><divclass="pg-header">小男孩管理</div><div><a>asdf</a><aid="">asdf</a><a>asdf</a><a>asdf</a><a>asdf</a></div><iframesrc="/"></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

转载于:https://www.cnblogs.com/patrick0715/p/6252695.html

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django之分页、cookie装饰器

实例：

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