django之分页

一、导入

from django.core.paginator import Paginator, InvalidPage

二、使用

def list_article(request):
    username = request.session.get("username")
    if username:
        # articles = Article.objects.filter(author__username=username)
        categorys = Category.objects.filter(author__username=username)
        # 自定义文章列表
        articles = []
        # 生成1000篇文章
        for i in range(1000):
            article = dict(id=i, title="Python从入门到放弃", category="Python",
                           author="Will Smith", created_time="2019-12-21",
                           latest_edit="2020-02-23")
            articles.append(article)
        # 获取请求页码
        page_num = int(request.GET.get("p", 1))
        # 用文章列表和每页显示的文章数初始化分页器，获取一个分页器对象
        paginator = Paginator(articles, 10)
        # 分页器的四个主要属性:count(传入的对象数量)、num_pages(分的页数)、page_range(页码的范围)、per_page(每页显示的对象数量)
        print(paginator.count, paginator.per_page, paginator.num_pages)
        try:
            # 分页器的一个主要方法get_page(传入页码,获取对应的页对象)
            # 考虑几种情形：1、页码不为整数即无效页码 2、页码小于或超出实际页码范围
            page_articles = paginator.page(number=page_num)
        except InvalidPage as e:
            page_articles = paginator.page(1)
        # 将页对象传递给模板进行渲染，页对象是一个可以迭代的对象，获取的是该页对象列表
        # 页对象有几个主要的方法和属性：
        # object_list 当前页的内容，元素
        # number 当前页的页码
        # paginator 分页器对象
        # has_next 有没有下一页
        # next_page_number 下一页的页码
        # has_previous 有没有上一页
        # previous_page_number 上一页页码
        # has_other_page 当前页有没有上一个或者下一页
        # start_index 当前页第一个对象的索引
        # end_index 当前页最后一个对象的索引
        return render(request, "article/list-article.html", {"articles": page_articles, "categorys": categorys})

<div id="list-article">
        <table class="table table-bordered table-striped table-hover table-condensed text-center">
            <tr>
                <th class="text-center">文章ID</th>
                <th class="text-center">文章标题</th>
                <th class="text-center">所属分类</th>
                <th class="text-center">作者</th>
                <th class="text-center">创建时间</th>
                <th class="text-center">修改时间</th>
                <th class="text-center">操作</th>
            </tr>
            {% for article in articles %}
            <tr>
                <td>{{ article.id }}</td>
                <td>{{ article.title }}</td>
                <td>{{ article.category}}</td>
                <td>{{ article.author }}</td>
                <td>{{ article.created_time }}</td>
                <td>{{ article.latest_edit }}</td>
                <td><a href="{% url 'article:edit' article.id %}">编辑</a>&nbsp;&nbsp;
                    &nbsp;
                    &nbsp;<a href="{% url 'article:delete' article.id %}">删除</a></td>
            </tr>
            {% endfor %}
        </table>

        <nav>
            <ul class="pagination pagination pull-right">
                {% if articles.has_previous %}
                    <li><a href="{% url 'article:list' %}?p={{ articles.previous_page_number }}"><span>&laquo;</span></a></li>
                {% else %}
                    <li class="disabled"><a href="{% url 'article:list' %}?p=1"><span>&laquo;</span></a></li>
                {% endif %}
                {% for page in articles.paginator.page_range %}
                    {% if page > articles.number|add:-5 and page < articles.number|add:5 %}
                        {% if page == articles.number %}
                            <li class="active"><a href="{% url 'article:list' %}?p={{ page }}">{{ page }}</a></li>
                        {% else %}
                            <li><a href="{% url 'article:list' %}?p={{ page }}">{{ page }}</a></li>
                        {% endif %}

                    {% endif %}
                {% endfor %}
                {% if articles.has_next %}
                    <li><a href="{% url 'article:list' %}?p={{ articles.next_page_number }}"><span>&raquo;</span></a></li>
                {% else %}
                    <li class="disabled"><a href="{% url 'article:list' %}?p={{ articles.number }}"><span>&raquo;</span></a></li>
                {% endif %}
            </ul>
        </nav>
    </div>