分頁器

時間 2019-12-10

標籤分頁简体版

原文原文鏈接

class Pagination(object):
    def __init__(self, current_page, all_count, per_page_num=10, pager_count=11):
        """
        封裝分頁相關數據
        :param current_page: 當前頁
        :param all_count:    數據庫中的數據總條數
        :param per_page_num: 每頁顯示的數據條數
        :param pager_count:  最多顯示的頁碼個數

        用法:
        queryset = model.objects.all()
        page_obj = Pagination(current_page,all_count)
        page_data = queryset[page_obj.start:page_obj.end]
        獲取數據用page_data而再也不使用原始的queryset
        獲取前端分頁樣式用page_obj.page_html
        """
        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

        # 總頁碼
        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):
        # 若是總頁碼 < 11個：
        if self.all_pager <= self.pager_count:
            pager_start = 1
            pager_end = self.all_pager + 1
        # 總頁碼  > 11
        else:
            # 當前頁若是<=頁面上最多顯示11/2個頁碼
            if self.current_page <= self.pager_count_half:
                pager_start = 1
                pager_end = self.pager_count + 1

            # 當前頁大於5
            else:
                # 頁碼翻到最後
                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標籤
        page_html_list.append('''
                    <nav aria-label='Page navigation>'
                    <ul class='pagination'>
                ''')
        first_page = '<li><a href="?page=%s">首頁</a></li>' % (1)
        page_html_list.append(first_page)

        if self.current_page <= 1:
            prev_page = '<li class="disabled"><a href="#">上一頁</a></li>'
        else:
            prev_page = '<li><a href="?page=%s">上一頁</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="#">下一頁</a></li>'
        else:
            next_page = '<li><a href="?page=%s">下一頁</a></li>' % (self.current_page + 1,)
        page_html_list.append(next_page)

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

View Code

視圖層調用方法css

from django.contrib.auth.decorators import login_required
from app01.utils.my_page import Pagination
@login_required
def backend(request):
    article_list = models.Article.objects.filter(blog=request.user.blog)
    # 用戶想訪問的當前頁面
    current_page = request.GET.get('page',1)
    # 用戶總條數
    all_count = article_list.count()
    page_obj = Pagination(current_page=current_page,all_count=all_count)
    # 對數據進行切分
    page_queryset = article_list[page_obj.start:page_obj.end]
    return render(request,'backend/backend.html',locals())

前端調用方法html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link href="https://cdn.bootcss.com/twitter-bootstrap/3.4.1/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.bootcss.com/sweetalert/2.1.2/sweetalert.min.js"></script>
    <link href="//netdna.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet">
    <script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.min.js"></script>
    <script src="https://cdn.bootcss.com/twitter-bootstrap/3.4.1/js/bootstrap.js"></script>
</head>
<body>
<nav class="navbar navbar-inverse">
    <div class="container-fluid">
        <!-- Brand and toggle get grouped for better mobile display -->
        <div class="navbar-header">
            <button type="button" class="navbar-toggle collapsed" data-toggle="collapse"
                    data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
                <span class="sr-only">Toggle navigation</span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
            </button>
            <a class="navbar-brand" href="#">後臺管理</a>
        </div>
        <!-- Collect the nav links, forms, and other content for toggling -->
        <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
            <ul class="nav navbar-nav navbar-right">
                {% if request.user.is_authenticated %}
                    <li><a href="">{{ request.user.username }}</a></li>
                    <li class="dropdown">
                        <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true"
                           aria-expanded="false">更多操做 <span class="caret"></span></a>
                        <ul class="dropdown-menu">
                            <li><a href="{% url 'edit_password' %}">修改密碼</a></li>
                            <li><a href="#">修改頭像</a></li>
                            <li role="separator" class="divider"></li>
                            <li><a href="{% url 'logout' %}">註銷</a></li>
                        </ul>
                    </li>

                {% endif %}

            </ul>
        </div><!-- /.navbar-collapse -->
    </div><!-- /.container-fluid -->
</nav>
<div class="container-fluid">
    <div class="row">
        <div class="col-md-3">
            <div class="panel-group" id="accordion" role="tablist" aria-multiselectable="true">
                <div class="panel panel-default">
                    <div class="panel-heading" role="tab" id="headingOne">
                        <h4 class="panel-title">
                            <a role="button" data-toggle="collapse" data-parent="#accordion" href="#collapseOne"
                               aria-expanded="true" aria-controls="collapseOne">
                                操做
                            </a>
                        </h4>
                    </div>
                    <div id="collapseOne" class="panel-collapse collapse in" role="tabpanel"
                         aria-labelledby="headingOne">
                        <div class="panel-body">
                            <a href="//">添加文章</a>
                        </div>
                    </div>
                    <div id="collapseOne" class="panel-collapse collapse in" role="tabpanel"
                         aria-labelledby="headingOne">
                        <div class="panel-body">
                            <a href="">添加隨筆</a>
                        </div>
                    </div>
                    <div id="collapseOne" class="panel-collapse collapse in" role="tabpanel"
                         aria-labelledby="headingOne">
                        <div class="panel-body">
                            <a href="">垃圾箱</a>
                        </div>
                    </div>
                </div>
            </div>

        </div>
         <div class="col-md-9">
                <div>
                    <!-- Nav tabs -->
                    <ul class="nav nav-tabs" role="tablist">
                        <li role="presentation" class="active"><a href="#home" aria-controls="home" role="tab"
                                                                  data-toggle="tab">文章</a></li>
                        <li role="presentation"><a href="#profile" aria-controls="profile" role="tab" data-toggle="tab">隨筆</a>
                        </li>
                        <li role="presentation"><a href="#messages" aria-controls="messages" role="tab"
                                                   data-toggle="tab">設置</a></li>
                        <li role="presentation"><a href="#settings" aria-controls="settings" role="tab"
                                                   data-toggle="tab">更多</a></li>
                    </ul>

                    <!-- Tab panes -->
                    <div class="tab-content">
                        <div role="tabpanel" class="tab-pane active" id="home">

                              <table class="table table-hover table-striped">
                                <thead>
                                    <tr>
                                        <th>標題</th>
                                        <th>發佈時間</th>
                                        <th>評論數</th>
                                        <th>點贊數</th>
                                        <th>操做</th>
                                    </tr>
                                </thead>
                                <tbody>
                                {% for article in page_queryset %}
                                    <tr>
                                        <td><a href="/{{ article.blog.userinfo.username }}/article/{{ article.pk }}">{{ article.title }}</a></td>
                                        <td>{{ article.create_time|date:'Y年m月d日' }}</td>
                                        <td>{{ article.common_num }}</td>
                                        <td>{{ article.up_num }}</td>
                                        <td></td>
                                    </tr>
                                {% endfor %}
                                </tbody>
                            </table>
                {{ page_obj.page_html|safe }}
                            
                          
                        </div>
                        <div role="tabpanel" class="tab-pane" id="profile">...</div>
                        <div role="tabpanel" class="tab-pane" id="messages">...</div>
                        <div role="tabpanel" class="tab-pane" id="settings">...</div>
                    </div>

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

</div>
</body>
</html>

View Code

1 循環打印對象替換爲 page_queryset 前端

2 在分頁位置插入 {{page_obj.page_html | safe }} 引用分頁器jquery

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