Django 分页器

2022 年 3 月 8 日
筆記
django, Django 分页器

Django 分页器

Django 分页器

在页面显示分页数据，需要用到Django分页器组件

先看效果图：

使用分页器需要导入模块

导入：from django.core.paginator import Paginator

方法介绍

Paginator对象：    
paginator = Paginator(user_list, 10)  # 传入分页数据，和展示的条数
# 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    

page对象：page=paginator.page(1)
# 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

示例

'''urls.py'''
from django.contrib import admin
from django.urls import path
from app01 import views


urlpatterns = [
    path('admin/', admin.site.urls),
    path('user_list/',views.user_page),
    path('delete/',views.delete),
]

'''views.py'''
from django.core.paginator import Paginator
from django.shortcuts import render, redirect

from app01 import models


def user_page(request):
    user_page_num = int(request.GET.get('page_num', 1))  # 用户不传页码默认为1
    user_list = models.User.objects.all()  # 获取所有数据

    '''Paginator 对象'''
    # 实例化
    paginator = Paginator(user_list, 10)  # 分页的数据，每页显示十行
    # print(paginator.count)  # 总条数   500
    # print(paginator.num_pages)   # 总页数 50
    # print(paginator.per_page)  # 每页显示条数 10
    # print(paginator.page_range) # 生成器，next拿一页  range(1,51)
    # print(paginator.page(1))  # page(1)第一页，()内写几可以拿到的页
    # 判断页码数和11的关系，布局

    '''Page对象'''
    try:
        page = paginator.page(user_page_num)  # 获取当前页
        # print(page.has_next())  # 判断有没有下一页  True
        # print(page.next_page_number())  # 下一页页码数  3
        # print(page.has_previous())  # 判断有没有上一页 True
        # print(page.previous_page_number())  # 上一页页码 1
        # print(paginator.object_list)   # 获取该页的所有数据的对象
    except Exception as e:
        user_page_num = paginator.num_pages  # 如果没有搜索页设置默认数显示最后一页
        page = paginator.page(user_page_num)  # 没有搜索页显示最后一页
    # print(page.number)   # 获取当前页码 2

    if paginator.num_pages > 11:
        # 开头的判断，如果当前页-5小于1，那么显示1，12
        if user_page_num - 5 < 1:
            page_range = range(1, 12)
        # 末尾的判断，如果当前页+5大于总页码数，回退11
        elif user_page_num + 5 > paginator.num_pages:
            page_range = range(paginator.num_pages - 10, paginator.num_pages + 1)
        # 中间当前页-5，+6
        else:
            page_range = range(user_page_num - 5, user_page_num + 6)
    else:
        page_range = paginator.page_range  # 如果小于11那么就显示少有的对象
    return render(request, 'user_page.html', locals())


def delete(request):
    del_id = request.GET.get('del_id')
    # is_delete = 0
    models.User.objects.filter(pk=del_id).delete()
    # models.User.objects.filter(pk=del_id).update(is_delete=1)
    import time
    time.sleep(3)
    return redirect('/user_list/')

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="//cdn.bootcdn.net/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
    <link href="//cdn.bootcdn.net/ajax/libs/twitter-bootstrap/3.4.1/css/bootstrap.min.css" rel="stylesheet">
    <script src="//cdn.bootcdn.net/ajax/libs/twitter-bootstrap/3.4.1/js/bootstrap.min.js"></script>
    <script src="//unpkg.com/sweetalert/dist/sweetalert.min.js"></script>
</head>
<body>

{#数据#}
<div class="container">
<h1  style="text-align: center">Uesr-Info</h1>
    <div class="row">
        <div class="col-md-8 col-md-offset-2">

            <div>

                <table class="table table-striped table-hover">
                    <thead>
                    <tr>
                        <th>id</th>
                        <th>name</th>
                        <th>phone</th>
                        <th>address</th>
                        <th>action</th>
                    </tr>
                    </thead>
                    <tbody>
                    {#   获取当前页的所有对象  #}
                    {% for user in page.object_list %}
                        <tr>
                            <td>{{ user.id }}</td>
                            <td>{{ user.name }}</td>
                            <td>{{ user.phone }}</td>
                            <td>{{ user.address }}</td>
                            <td class="btn btn-danger btn-xs"><a href="/delete/?del_id={{ user.id }}" id="del">删除</a>
                            </td>
                        </tr>
                    {% endfor %}

                    </tbody>
                </table>
            </div>

        </div>
    </div>
</div>

{#分页#}
<nav aria-label="Page navigation" class="text-center">
    <ul class="pagination">
        {# 判断是否有上一页 #}
        {% if page.has_previous %}
            <li>
                <a href="/user_list/?page_num={{ page.previous_page_number }}" aria-label="Previous">
                    <span aria-hidden="true">&laquo;</span>
                </a>
            </li>
        {% else %}
            <li class="disabled">
                <a href="" aria-label="Previous">
                    <span aria-hidden="true">&laquo;</span>
                </a>
            </li>
        {% endif %}


        {#   for循环拿到页码数   #}
        {% for foo in page_range %}
            {% if user_page_num == foo %}
                <li class="active"><a href="/user_list/?page_num={{ foo }}">{{ foo }}</a></li>
            {% else %}
                <li><a href="/user_list/?page_num={{ foo }}">{{ foo }}</a></li>
            {% endif %}
        {% endfor %}


        {#   判断是否有下一页   #}
        {% if page.has_next %}
            <li>

                <a href="/user_list/?page_num={{ page.next_page_number }}" aria-label="Next">
                    <span aria-hidden="true">&raquo;</span>
                </a>
            </li>
        {% else %}
            <li class="disabled">

                <a href="" aria-label="Next">
                    <span aria-hidden="true">&raquo;</span>
                </a>
            </li>
        {% endif %}

    </ul>
</nav>


</body>
<script>
    $('#del').click(function () {

        swal({
            title: "确定要删除吗?",
            text: "删除一条数据",
            icon: "warning",
            buttons: true,
            dangerMode: true,
        })
            .then((willDelete) => {
                if (willDelete) {
                    swal("删除成功", {
                        icon: "success",
                    });
                } else {
                    swal("取消删除");
                }
            });
    })
</script>
</html>

分页器模板


class Pagination(object):
    def __init__(self, current_page, all_count, per_page_num=2, pager_count=5):
        """
        封装分页相关数据
        :param current_page: 当前页
        :param all_count:    数据库中的数据总条数
        :param per_page_num: 每页显示的数据条数
        :param pager_count:  最多显示的页码个数
        """
        try:
            current_page = int(current_page)
        except Exception as e:
            current_page = 1

        if current_page < 1:
            current_page = 1

        self.current_page = current_page

        self.all_count = all_count
        self.per_page_num = per_page_num

        # 总页码
        all_pager, tmp = divmod(all_count, per_page_num)
        if tmp:
            all_pager += 1
        self.all_pager = all_pager

        self.pager_count = pager_count
        self.pager_count_half = int((pager_count - 1) / 2)
    @property
    def start(self):
        return (self.current_page - 1) * self.per_page_num

    @property
    def end(self):
        return self.current_page * self.per_page_num

    def page_html(self):
        # 如果总页码 < 11个：
        if self.all_pager <= self.pager_count:
            pager_start = 1
            pager_end = self.all_pager + 1
        # 总页码  > 11
        else:
            # 当前页如果<=页面上最多显示11/2个页码
            if self.current_page <= self.pager_count_half:
                pager_start = 1
                pager_end = self.pager_count + 1

            # 当前页大于5
            else:
                # 页码翻到最后
                if (self.current_page + self.pager_count_half) > self.all_pager:
                    pager_end = self.all_pager + 1
                    pager_start = self.all_pager - self.pager_count + 1
                else:
                    pager_start = self.current_page - self.pager_count_half
                    pager_end = self.current_page + self.pager_count_half + 1

        page_html_list = []
        # 添加前面的nav和ul标签
        page_html_list.append('''
                    <nav aria-label='Page navigation>'
                    <ul class='pagination'>
                ''')
        first_page = '<li><a href="?page=%s">首页</a></li>' % (1)
        page_html_list.append(first_page)

        if self.current_page <= 1:
            prev_page = '<li class="disabled"><a href="#">上一页</a></li>'
        else:
            prev_page = '<li><a href="?page=%s">上一页</a></li>' % (self.current_page - 1,)

        page_html_list.append(prev_page)

        for i in range(pager_start, pager_end):
            if i == self.current_page:
                temp = '<li class="active"><a href="?page=%s">%s</a></li>' % (i, i,)
            else:
                temp = '<li><a href="?page=%s">%s</a></li>' % (i, i,)
            page_html_list.append(temp)

        if self.current_page >= self.all_pager:
            next_page = '<li class="disabled"><a href="#">下一页</a></li>'
        else:
            next_page = '<li><a href="?page=%s">下一页</a></li>' % (self.current_page + 1,)
        page_html_list.append(next_page)

        last_page = '<li><a href="?page=%s">尾页</a></li>' % (self.all_pager,)
        page_html_list.append(last_page)
        # 尾部添加标签
        page_html_list.append('''
                                           </nav>
                                           </ul>
                                       ''')
        return ''.join(page_html_list)

Tags: django Django 分页器

Previous post

MySQL [ERROR] [MY-013183]

Next post

苹果官网开始维护！iPhone SE3凌晨2点登场