Django入门到放弃之分页器

简介: Django入门到放弃之分页器

1.属性和方法

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#######1 Paginator对象的属性和方法

    book_list=models.Book.objects.all() # 注意all操作实际是分批次获取数据,当前版本为limit 21

    # 实例化得到对象

    # 第一个参数:要分页的数据,book_list

    # 第二个参数:没有条数

    paginator=Paginator(book_list,10# 分页的数据  每页展示的数据个数

    # Paginator对象的属性和方法

    print(paginator.per_page) # 每页显示的条数

    print(paginator.count) # 总条数,总共要分页多少条数据

    print(paginator.num_pages) # 总页码数

    print(paginator.page_range) # 页码数生成器 rang(1,总页数+1)

    

    

######3 Page对象的属性和方法

    # Page类 的对象 

    page=paginator.page(2)   #  第一页的对象

    

    # 每一页的对象,属性和方法

    print(page.count())      # 每一页的页码数

    print(page.has_next())      # 有没有下一页

    print(page.next_page_number()) # 下一页页码

    print(page.has_previous())  # 是否有上一页

    print(page.previous_page_number()) # 上一页页面 (当前页如果是第一页,没有上一页)

    print(page.object_list)            # 当前页的所有数据

    print(page.number)           # 当前页的页码数

2.示例:  

urls.py

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from app01 import views

urlpatterns = [

    path('admin/', admin.site.urls),

    path('', views.index,name='index'),

    path('test', views.test,name='test'),

]

view.py

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from django.shortcuts import render, HttpResponse, reverse, redirect

from django.core.paginator import Paginator

from app01 import models

 

 

# Create your views here.

 

def index(request):

    # 设置跳转的页面,default=1为直接访问首页时初始化的值

    page_num_int = int(request.GET.get('page',default=1)) 

    book_list = models.Book.objects.all()  # 注意all操作实际是分批次获取数据,当前版本为limit 21

 

    # 实例化对象

    # 设置每页展示的数据个数,默认为10

    per_page = int(request.GET.get('per_page',default=10))

    paginator = Paginator(book_list, per_page)  # 分页的数据  每页展示的数据个数

 

    # 如果总页数大于 展示个数+1 情况下,如果跳转的页面小于5则直接显示 1-10页,如果跳转的页面+5大于总页数则显示最后10页,否则显示当前页前5后5页

    # 如果总页数小于 展示个数+1 情况下,则展示全部页数

    if paginator.num_pages > 11:

        if (page_num_int - 5) < 1:

            page_range = range(1,11)

        elif page_num_int + 5 > paginator.num_pages:

            page_range = range(paginator.num_pages - 10,paginator.num_pages + 1)

        else:

            page_range = range(page_num_int - 5, page_num_int + 5# 页码数生成器 rang(1,总页数+1)

    else:

        page_range = paginator.page_range

    page_obj = paginator.page(page_num_int)

 

 

    return render(request, 'index.html'locals())

index.html

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<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Title</title>

    <script src="/static/jquery-3.3.1/jquery-3.3.1.min.js"></script>

    <link rel="stylesheet" href="/static/bootstrap/css/bootstrap.min.css">

    <style>

        # 设置placeholder字体颜色

        input::-webkit-input-placeholder{

            color:rgb(51122183);

        }

        input::-moz-placeholder{   /* Mozilla Firefox 19+ */

            color:rgb(51122183);

        }

        input:-moz-placeholder{    /* Mozilla Firefox 4 to 18 */

            color:rgb(51122183);

        }

        input:-ms-input-placeholder{  /* Internet Explorer 10-11 */

            color:rgb(51122183);

        }

 

        .pg {

            line-height: 26px;

        }

 

        #jump,#per_page_num {

            padding: -1px;

            margin: -1px;

            border: 1px solid rgb(221221221);

            width: 70px;

            line-height: 30px;

            font-size: 14px;

            color: rgb(51122183);

        }

 

        #x1,#x2 {

            padding: 0;

        }

 

    </style>

</head>

<body>

<div class="container-fluid">

    <div class="row">

        <div class="col-md-8 col-md-offset-2">

            <table class="table">

                <thead>

                <tr>

                    <th>ID</th>

                    <th>名称</th>

                    <th>价格</th>

                </tr>

                </thead>

                <tbody>

                

                # 获取当前页所有数据,循环替换

                {% for page in page_obj.object_list %}

                    <tr>

                        <td>{{ page.id }}</td>

                        <td>{{ page.name }}</td>

                        <td>{{ page.price }}</td>

                    </tr>

                {% endfor %}

                </tbody>

            </table>

 

            <div class="text-center">

                <nav aria-label="Page navigation">

                    <ul class="pagination pg">

                    # 如果当前页有上一页(跳转到首页),则跳转否则禁止点击

                        {% if page_obj.has_previous %}

                            <li>

                                {#    <a href="/?page={{ page_obj.previous_page_number }}" aria-label="Previous">#}

                                <a href="/?page=1&per_page={{ per_page }}" aria-label="Previous">

                                    <span aria-hidden="true">«</span>

                                </a>

                            </li>

                        {% else %}

                            <li class="disabled">

                                <a href="" aria-label="Previous">

                                    <span aria-hidden="true">«</span>

                                </a>

                            </li>

                        {% endif %}

 

                    # 分页a标签添加跳转链接,当前页添加active属性

                        {% for page_num in page_range %}

                            {% if page_num_int == page_num %}

                                <li class="active"><a href="/?page={{ page_num }}">{{ page_num }}</a></li>

                            {% else %}

                                <li><a href="/?page={{ page_num }}&per_page={{ per_page }}">{{ page_num }}</a></li>

                            {% endif %}

                        {% endfor %}

 

                        #如果不是最后一页则展示,否则不展示

                        {% if page_num_int != paginator.num_pages  %}

                             <li><a href="/?page={{ paginator.num_pages }}&per_page={{ per_page }}">... {{ paginator.num_pages }}</a></li>

                        {% endif %}

 

                    # 如果有下一页则跳转,否则禁用

                        {% if page_obj.has_next %}

                            <li>

                                {#    <a href="/?page={{ page_obj.next_page_number }}" aria-label="Next">#}

                                <a href="/?page={{ paginator.num_pages }}&per_page={{ per_page }}" aria-label="Next">

                                    <span aria-hidden="true">»</span>

                                </a>

                            </li>

                        {% else %}

                            <li class="disabled">

                                <a href="" aria-label="Next">

                                    <span aria-hidden="true">»</span>

                                </a>

                            </li>

                        {% endif %}

 

                        # 设置跳转

                        <li>

                               <span id="x1"><input type="text"   id="jump" size="2" title="输入页码,按回车快速跳转"   placeholder="{{ page_num_int }}/ {{ paginator.num_pages }} 页"

                                       onkeydown="if(event.keyCode===13) {window.location='?page='+this.value+'&per_page={{ per_page }}'; doane(event);}">

                                     </span>

                        </li>

 

                        # 设置分页个数

                        <li>

                               <span id="x2">

                                   <input type="text" id="per_page_num" size="2" placeholder=" 条数:{{ per_page }}"

                                       onkeydown="if(event.keyCode===13) {window.location='?page='+ '{{ page_num_int }}&per_page=' + this.value; doane(event);}">

                               </span>

                        </li>

                    </ul>

                </nav>

 

            </div>

        </div>

    </div>

</div>

 

</body>

</html>


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