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="%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：

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：

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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