Django自定制分页功能

时间：2023-02-07 00:25:13

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"""django_paginner URL Configuration

The `urlpatterns` list routes URLs to views. For more information please see:

    https://docs.djangoproject.com/en/2.1/topics/http/urls/

Examples:

Function views

    1. Add an import:  from my_app import views

    2. Add a URL to urlpatterns:  path('', views.home, name='home')

Class-based views

    1. Add an import:  from other_app.views import Home

    2. Add a URL to urlpatterns:  path('', Home.as_view(), name='home')

Including another URLconf

    1. Import the include() function: from django.urls import include, path

    2. Add a URL to urlpatterns:  path('blog/', include('blog.urls'))

"""

from django.contrib import admin

from django.urls import path

from app01 import views

urlpatterns = [

    path('admin/', admin.site.urls),

    path('index/', views.index),

    path('index1/', views.index1),

]

views:

from django.shortcuts import render, HttpResponse

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

# Create your views here.

USER_LIST = []

for i in range(1, 659):

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

    USER_LIST.append(temp)

def index(request):

    # 当前的页数

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

    # 每页显示10个

    per_page_count = 10

    # 第一页(0,10)索引是0到9

    # 第二页(10,20)索引是10到19

    current_page = int(current_page)

    # 开始:当前页-1*每页显示10个

    # 第二页

    # (2-1)*10

    start = (current_page - 1) * per_page_count

    # 2*10

    end = current_page * per_page_count

    data = USER_LIST[start:end]

    if current_page <= 1:

        prev_page = 1

    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})

class CustomPaginator(Paginator):

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

        # 当前页

        self.current_page = int(current_page)

        # 每页最多显示页码数量

        self.per_page_num = int(per_pager_num)

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

    def pager_num_range(self):

        # 当前页

        # self.current_page

        # 每页最多能显示的页码数量,漂亮最好取奇数 11

        # self.per_page_num

        # 总页数

        # self.num_pages

        # 总页数是django分页功能根据数据大小自动分配好的

        # 如果总页数小于每页最多能显示的页码数量

        # 那么就返回range(第一页到总页数+1),因为range取值是取(开头,结尾-1)

        if self.num_pages < self.per_page_num:

            return range(1, self.num_pages + 1)

        # 总页数特别多

        # 当你的当前页 小于或等于,最多显示的页数的一半时,显示前五个,后五个

        part = int(self.per_page_num / 2)

        if self.current_page <= part:

            # return range(1, part + 1)

            return range(1, self.per_page_num + 1)

        # 极限值:如果当前页+最多显示页数一半>总页数(超出了显示的范围)

        # 返回range(总页数-最多显示的页数,总页数+1)

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

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

        # if self.current_page > part:

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

def index1(request):

    # 全部数据:USER_LIST=得出共有多少条数据

    # 10,

    # 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(是否具有下一页;是否有上一页)

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

    paginator = CustomPaginator(current_page, 7, USER_LIST, 10)

    try:

        posts = paginator.page(current_page)

        # 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

        # number                当前页

        # paginator             paginator对象

    except PageNotAnInteger:

        posts = paginator.page(1)

    except EmptyPage:

        posts = paginator.page(paginator.num_pages)

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

templates-index.html

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <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>

pager.html

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Title</title>

</head>

<body>

{% if posts.has_previous %}

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

{% else %}

    <a href="#">上一页</a>

{% endif %}

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

    {% if i == posts.number %}

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

    {% else %}

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

    {% endif %}

{% endfor %}

{% if posts.has_next %}

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

{% else %}

    <a href="#">下一页</a>

{% endif %}

<span>

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

        </span>

</body>

</html>

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