分页

1.简单分页

from django.conf.urls import url

from django.contrib import admin

from app01 import views

urlpatterns = [

    url(r'^index.html$', views.index),

]

project/urls.py

from django.shortcuts import render,HttpResponse,redirect

USER_LIST = []

for i in range(1,999):

    temp = {'name':'root'+str(i),'age':i}

    USER_LIST.append(temp)

def index(request):

    per_page_count = 10

    current_page = request.GET.get('p')

    current_page = int(current_page)

    #p=1  索引 0，10    0-9

    #p=2  索引10，20   10-19

    start = (current_page-1) * per_page_count

    end = (current_page) * per_page_count

    data = USER_LIST[start:end]

    prev_page = current_page -1

    next_page = current_page +1

    return render(request,'index.html',{'user_list':data,'prev_page':prev_page,'next_page':next_page})

app01/views.py

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Title</title>

</head>

<body>

    <ul>

        {% for row in user_list %}

            <li>{{ row.name }}-{{ row.age }}</li>

        {% endfor %}

    </ul>

    <a href="/index.html?p={{ prev_page }}">上一页</a>

    <a href="/index.html?p={{ next_page }}">下一页</a>

</body>

</html>

templates/index.html

展示效果：

2.django内置分页

传入：
- 所有数据
- 当前页
- 每页显示10条
- 最多页面11个

from django.conf.urls import url

from django.contrib import admin

from app01 import views

urlpatterns = [

    url(r'^index1.html$', views.index1),

]

project/urls.py

from django.shortcuts import render,HttpResponse,redirect

from django.core.paginator import EmptyPage, Paginator,PageNotAnInteger

USER_LIST = []

for i in range(1,999):

    temp = {'name':'root'+str(i),'age':i}

    USER_LIST.append(temp)

#django内置分页

def index1(request):

    # per_page: 每页显示条目数量

    # count:    数据总个数

    # num_pages:总页数

    # page_range:总页数的索引范围，如: (1,10),(1,200)

    # page:     page对象

    current_page = request.GET.get('p')

    #paginator对象

    paginator = Paginator(current_page,11,USER_LIST,10)  #每页10条数据

    try:

        posts = paginator.page(current_page)

        #age对象

        # has_next              是否有下一页

        # next_page_number      下一页页码

        # has_previous          是否有上一页

        # previous_page_number  上一页页码

        # object_list           分页之后的数据列表，已经切片好的数据

        # number                当前页

        # paginator             paginator对象

    except PageNotAnInteger:   #不是整数

        posts = paginator.page(1)

    except EmptyPage:     #空页

        posts = paginator.page(paginator.num_pages) #超出总页数，内容显示总页数

    return render(request,'index1.html',{'posts':posts})

app01/views.py

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Title</title>

</head>

<body>

    <ul>

        {% for row in posts.object_list %}

            <li>{{ row.name }}-{{ row.age }}</li>

        {% endfor %}

    </ul>

    {% include 'include/pager.html' %}

</body>

</html>

templates/index1.html

{% if posts.has_previous %}

    <a href="/index1.html?p={{ posts.previous_page_number }}">上一页</a>

{% else %}

    <a href="#">上一页</a>

{% endif %}

{% if posts.has_next %}

    <a href="/index1.html?p={{ posts.next_page_number }}">下一页</a>

{% else %}

    <a href="#">下一页</a>

{% endif %}

<apan>

    {{ posts.number }}/{{ posts.paginator.num_pages }}

</apan>

temlplates/include/pager.html

展示效果：

扩展内置分页：

from django.shortcuts import render,HttpResponse,redirect

from django.core.paginator import EmptyPage, Paginator,PageNotAnInteger

USER_LIST = []

for i in range(1,999):

    temp = {'name':'root'+str(i),'age':i}

    USER_LIST.append(temp)

class CustomPaginator(Paginator):

    def __init__(self, current_page,per_page_number,*args, **kwargs):

        #当前页

        self.current_page = int(current_page)

        #最多显示页码数11

        self.per_page_number = int(per_page_number)

        super(CustomPaginator, self).__init__(*args, **kwargs)

    def page_num_range(self):

        #  self.current_page     当前页

        #  self.per_page_number  最多显示页码数11

        #  self.num_pages        总页数

        if self.num_pages < self.per_page_number:  #   总页数<11

            return range(1,self.num_pages+1)    #   遍历（1，总页数+1）

        part = int(self.per_page_number/2)

        if self.current_page <= part:             # 当前页 <=  5

            return range(1,self.per_page_number+1)   # 遍历（1，11+1）

        if (self.current_page+part) >= self.num_pages:  #当前页+5 >=总页数

            return range(self.num_pages-self.per_page_number,self.num_pages+1)          # 遍历（总页数-11，总页数+1）

        return range(self.current_page-part,self.current_page+part+1)

#django内置分页

def index1(request):

    # per_page: 每页显示条目数量

    # count:    数据总个数

    # num_pages:总页数

    # page_range:总页数的索引范围，如: (1,10),(1,200)

    # page:     page对象

    current_page = request.GET.get('p')

    #paginator对象

    paginator = CustomPaginator(current_page,11,USER_LIST,10)  #每页10条数据

    try:

        posts = paginator.page(current_page)

        #age对象

        # has_next              是否有下一页

        # next_page_number      下一页页码

        # has_previous          是否有上一页

        # previous_page_number  上一页页码

        # object_list           分页之后的数据列表，已经切片好的数据

        # number                当前页

        # paginator             paginator对象

    except PageNotAnInteger:   #不是整数

        posts = paginator.page(1)

    except EmptyPage:     #空页

        posts = paginator.page(paginator.num_pages) #超出总页数，内容显示总页数

    return render(request,'index1.html',{'posts':posts})

app01/views.py #扩展

{% if posts.has_previous %}

    <a href="/index1.html?p={{ posts.previous_page_number }}">上一页</a>

{% else %}

    <a href="#">上一页</a>

{% endif %}

{% for i in posts.paginator.page_num_range %}

    {% if i == posts.number %}

        <a style="font-size: 30px" href="/index1.html?p={{ i }}">{{ i }}</a>

    {% else %}

        <a href="/index1.html?p={{ i }}">{{ i }}</a>

    {% endif %}

{% endfor %}

{% if posts.has_next %}

    <a href="/index1.html?p={{ posts.next_page_number }}">下一页</a>

{% else %}

    <a href="#">下一页</a>

{% endif %}

<apan>

    {{ posts.number }}/{{ posts.paginator.num_pages }}

</apan>

temlplates/include/pager.html #扩展

效果展示：

3,自定制分页

传入：
- 所有数据个数
- 当前页
- 每页显示10条
- 最多页面11个

from django.conf.urls import url

from django.contrib import admin

from app01 import views

urlpatterns = [

    url(r'^index2.html$', views.index2),

]

project/views.py

def index2(request):

    from app01.pager import Pagination

    # 传入：

    # - 所有数据的个数

    # - 当前页

    # - 每页显示30条

    # - 最多页面7个

    current_page = request.GET.get('p')

    page_obj = Pagination(666, current_page)

    data_list = USER_LIST[page_obj.start():page_obj.end()]

    return render(request, 'index2.html', {'data': data_list, 'page_obj': page_obj})

app01/views.py

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Title</title>

    <link rel="stylesheet" href="/static/bootstrap-3.3.7-dist/css/bootstrap.css"/>

</head>

<body>

    <ul>

        {% for row in data %}

            <li>{{ row.name }}-{{ row.age }}</li>

        {% endfor %}

    </ul>

    {% for i in page_obj.page_num_range %}

        <a href="/index2.html?p={{ i}}">{{ i }}</a>

    {% endfor %}

    <hr/>

    <ul class="pagination pagination-sm">

        {{ page_obj.page_str|safe }}

    </ul>

    <div style="height: 300px"></div>

</body>

</html>

templates/index2.html

# !/usr/bin/env python

# -*- coding: utf-8 -*-

# Author:daly

class Pagination(object):

    def __init__(self,totalCount,currentPage,perPageItemNum=10,maxPageNum=7):

        self.total_count= totalCount    #数据总个数

        try:

            v = int(currentPage)    #当前页

            if v <= 0:

                v = 1

            self.current_page = v

        except Exception as e:

            self.current_page = 1

        self.per_page_item_num = perPageItemNum    #每页显示个数

        self.max_page_num = maxPageNum      #最多显示页数

    def start(self):

        return (self.current_page-1) * self.per_page_item_num

    def end(self):

        return self.current_page * self.per_page_item_num

    @property

    def num_pages(self):

        #总页数

        a,b = divmod(self.total_count,self.per_page_item_num)

        if b == 0:

            return a

        return a + 1

    def page_num_range(self):

        #  self.current_page     当前页

        #  self.max_page_num     最多显示页码数

        #  self.num_pages        总页数

        if self.num_pages < self.max_page_num:

            return range(1,self.num_pages+1)

        part = int(self.max_page_num/2)

        if self.current_page <= part:

            return range(1,self.max_page_num+1)

        if (self.current_page+part) >= self.num_pages:

            return range(self.num_pages-self.max_page_num,self.num_pages+1)

        return range(self.current_page-part,self.current_page+part+1)

    def page_str(self):

        page_list = []

        first = "<li><a href='/index2.html?p=1'>首页</a></li>"

        page_list.append(first)

        if self.current_page == 1:

            perv = "<li><a href='#'>上一页</a></li>"

        else:

            perv = "<li><a href='/index2.html?p=%s'>上一页</a></li>" %(self.current_page-1,)

        page_list.append(perv)

        for i in self.page_num_range():

            if i == self.current_page:

                temp = "<li class='active'><a href='/index2.html?p=%s'>%s</a></li>"%(i,i)

            else:

                temp = "<li><a href='/index2.html?p=%s'>%s</a></li>" % (i, i)

            page_list.append(temp)

        if self.current_page == self.num_pages:

            nex = "<li><a href='#'>下一页</a></li>"

        else:

            nex = "<li><a href='/index2.html?p=%s'>下一页</a></li>" % (self.current_page + 1,)

        page_list.append(nex)

        last = "<li><a href='/index2.html?p=%s'>尾页</a></li>"%(self.num_pages,)

        page_list.append(last)

        return ''.join(page_list)

app01/pager.py

展示效果：

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