django之分页cookie装饰器
Posted patrick-py
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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
<!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); $.cookie(\'per_page_count\',v, {\'path\': "/user_list/"}); location.reload(); } </script> </body> </html>
/* li.html */
<li>{{ item }}</li>
views.py文件
from utils import pagination LIST = [] for i in range(500): LIST.append(i) def user_list(request): current_page = request.GET.get(\'p\', 1) current_page = int(current_page) val = request.COOKIES.get(\'per_page_count\',10) val = int(val) page_obj = pagination.Page(current_page,len(LIST),val) data = LIST[page_obj.start:page_obj.end] page_str = page_obj.page_str("/user_list/") return render(request, \'user_list.html\', {\'li\': data,\'page_str\': page_str})
二、cookie使用
Cookie 是由 Web 服务器保存在用户浏览器（客户端）上的小文本文件，它可以包含有关用户的信息;cookie的内容主要包括：名字，值，过期时间，路径和域。
1、获取Cookie：
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request.COOKIES[\'key\']request.get_signed_cookie(key, default=RAISE_ERROR, salt=\'\', max_age=None) 参数： default: 默认值 salt: 加密盐 max_age: 后台控制过期时间 |
2、设置Cookie：
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rep = HttpResponse(...) 或 rep ＝ render(request, ...)rep.set_cookie(key,value,...)rep.set_signed_cookie(key,value,salt=\'加密盐\',...) 参数： key, 键 value=\'\', 值 max_age=None, 超时时间 expires=None, 超时时间(IE requires expires, so set it if hasn\'t been already.) path=\'/\', Cookie生效的路径，/ 表示根路径，特殊的：跟路径的cookie可以被任何url的页面访问 domain=None, Cookie生效的域名 secure=False, https传输 httponly=False 只能http协议传输，无法被JavaScript获取（不是绝对，底层抓包可以获取到也可以被覆盖） |
由于cookie保存在客户端的电脑上，所以，JavaScript和jquery也可以操作cookie。
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<script src=\'/static/js/jquery.cookie.js\'></script>$.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})
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>
{% 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 %}
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