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django之分页、cookie装饰器
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="http://www.mamicode.com/%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="http://www.mamicode.com/%s?p=%s">%s</a>‘ % (base_url, i, i) else: temp = ‘<a class="page" href="http://www.mamicode.com/%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="http://www.mamicode.com/%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 = http://www.mamicode.com/base + val;>""" % (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})
django之分页、cookie装饰器
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