django list类型数据分页

一、概述

有一个django项目,由于业务要求,自己构造了一个list数据类型。这是一个临时数据,不需要保存到表中,但是需要分页展示。

由于之前学习的Django的分页器(paginator),参考链接:

https://www.cnblogs.com/xiao987334176/p/9285629.html

它是针对于queryset类型做的分页,那么list类型是否也可以呢?答案是可以的!

 

二、项目测试

新建项目paging_demo

本文使用的django版本为2.x系列

 

paging_demo/urls.py

from django.contrib import admin
from django.urls import path
from application import views

urlpatterns = [
    path('admin/', admin.site.urls),
    path('', views.index),
]
View Code

 

paging_demo/settings.py ,最后一行增加

# 每一页显示几条
PAGE_SIZE = 10
# 分页数
PAGE_NUM_PAGES = 11

 

application/views.py

from django.shortcuts import render
from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger
from paging_demo import settings


# Create your views here.
def index(request):
    """
    首页
    :param request:
    :return:
    """
    host_list = []
    for i in range(100):
        dic = {"id":i,"ip":"192.168.1.%s"%i}
        host_list.append(dic)


    # 分页
    paginator = Paginator(host_list, settings.PAGE_SIZE)  # 每页显示指定的条数

    # 异常判断
    try:
        # 当前页码,如果取不到page参数,默认为1
        current_num = int(request.GET.get("page", 1))  # 当前页码
        host_list = paginator.page(current_num)  # 获取当前页码的数据
    except EmptyPage:  # 页码不存在时,报EmptyPage错误
        log_list = paginator.page(1)  # 强制更新为第一页

    #  如果页数十分多时,换另外一种显示方式
    if paginator.num_pages > settings.PAGE_NUM_PAGES:  # 一般网页展示11页,左5页,右5页,加上当前页,共11页
        if current_num - 5 < 1:  # 如果前5页小于1时
            pageRange = range(1, settings.PAGE_NUM_PAGES)  # 页码的列表:范围是初始状态
        elif current_num + 5 > paginator.num_pages:  # 如果后5页大于总页数时
            # 页码的列表:范围是(当前页-5,总页数+1)。因为range顾头不顾尾,需要加1
            pageRange = range(current_num - 5, paginator.num_pages + 1)
        else:
            # 页码的列表:后5页正常时,页码范围是(当前页-5,当前页+6)。注意不是+5,因为range顾头不顾尾!
            pageRange = range(current_num - 5, current_num + 6)
    else:
        pageRange = paginator.page_range  # 页码的列表

    data = {
        "paginator": paginator, "current_num": current_num, "pageRange": pageRange,
        "host_list": host_list
    }
    return render(request, "index.html", data)
View Code

 

templates/index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link href="https://cdn.bootcss.com/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.min.js"></script>
</head>
<body>

<div class="container">
    <div class="row">
        <div class="panel panel-success">
            <!-- Default panel contents -->
            <div class="panel-heading text-center">
                <span>主机列表</span>
            </div>
            <!-- Table -->
            <table class="table table-bordered">
                <thead>
                <tr>
                    <th>序号</th>
                    <th>ip地址</th>
{#                    <th>操作</th>#}
                </tr>
                </thead>
                <tbody>
                {% for item in host_list %}
                    <tr>
                        <th>
                            <span>{{ forloop.counter }}</span>
                        </th>
                        <td>{{ item.ip }}</td>
                    </tr>
                {% endfor %}

                </tbody>
            </table>

        </div>

        {#分页展示#}
        <nav aria-label="Page navigation">
            <ul class="pagination">
                <li><a href="?page=1" aria-label="Previous"><span aria-hidden="true">首页</span></a></li>

                {#has_previous 判断是否有上一页#}
                {% if host_list.has_previous %}
                    {#previous_page_number 上一页的页码#}
                    <li><a href="?page={{ host_list.previous_page_number }}" aria-label="Previous"><span
                            aria-hidden="true">上一页</span></a></li>
                {% else %}
                    {#class="disabled" 禁止用户点击#}
                    <li class="disabled"><a href="" aria-label="Previous"><span aria-hidden="true">上一页</span></a></li>
                {% endif %}

                {#遍历页码的列表#}
                {% for i in pageRange %}
                    {#判断当前页码数等于底部页码时#}
                    {% if current_num == i %}
                        {#增加class,加深按钮#}
                        <li class="active"><a href="?page={{ i }}">{{ i }}</a></li>
                    {% else %}
                        {#href参数为简写,它会自动获取当前路径,并拼接参数#}
                        <li><a href="?page={{ i }}">{{ i }}</a></li>
                    {% endif %}

                {% endfor %}

                {#has_next 判断是否有下一页#}
                {% if host_list.has_next %}
                    {#next_page_number 下一页的页码#}
                    <li><a href="?page={{ host_list.next_page_number }}" aria-label="Next"><span
                            aria-hidden="true">下一页</span></a></li>
                {% else %}
                    {#class="disabled" 禁止用户点击#}
                    <li class="disabled"><a href="" aria-label="Next"><span aria-hidden="true">下一页</span></a></li>
                {% endif %}

                <li><a href="?page={{ paginator.num_pages }}" aria-label="Next"><span aria-hidden="true">最后一页</span></a>
                </li>

            </ul>
        </nav>
    </div>
</div>

</body>
</html>
View Code

 

运行项目,访问页面:

http://127.0.0.1:8000/

 

效果如下:

 

posted @ 2020-03-31 12:18  肖祥  阅读(1035)  评论(0编辑  收藏  举报