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django分页器

参考博文:https://www.cnblogs.com/yuanchenqi/articles/9036515.html

精华总结

1,批量导入:
    book_list=[]
    for i in range(100):
        book=Book(title="book_%s"%i,price=i*i)
        book_list.append(book)

    Book.objects.bulk_create(book_list)
2,分页器:
    paginator=Paginator(book_list,3)
    print("count:",paginator.count)           #数据总数
    print("num_pages",paginator.num_pages)    #总页数
    print("page_range",paginator.page_range)  #页码的列表
3,当前页
    current_page_num=int(request.GET.get("page",1))  # 1代表默认第一页
4,页面超出范围
    except EmptyPage as e:
         current_page=paginator.page(1)     # 显示第一页
5,下面点击数字         
    {% for item in page_range %}
        li><a href="?page={{ item }}">{{ item }}</a></li>  # ?page={{ item }} 跳转当前页面  
    {% endfor %}
6,当前页码变色
    {% if current_page_num == item %}
        <li class="active"><a href="?page={{ item }}">{{ item }}</a></li>
    {% else %}
        <li><a href="?page={{ item }}">{{ item }}</a></li>
    {% endif %}    
7,上一页
    页码:
        <li><a href="?page={{ current_page_num|add:-1 }}" aria-label="Previous"><span aria-hidden="true">上一页
    分页对象:
        <li><a href="?page={{ current_page.previous_page_number  }}" aria-label="Previous"><span aria-hidden="true">上一页
8,上下页
    print(page2.has_next())            #是否有下一页
    print(page2.next_page_number())    #下一页的页码
    print(page2.has_previous())        #是否有上一页
    print(page2.previous_page_number()) #上一页的页码
9,当前页有无下一页
    {% if current_page.has_previous %}
    <li><a href="?page={{ current_page.previous_page_number  }}" aria-label="Previous"><span aria-hidden="true">上一页</span></a></li>
    {% else %}
    <li class="disabled"><a href="" aria-label="Previous"><span aria-hidden="true">上一页</span></a></li>
    {% endif %}
10,显示11个页码
    view代码:
    if paginator.num_pages>11:  # 页码数超过11    

        if current_page_num-5<1:  # 小于1页
            page_range=range(1,12)
        elif current_page_num+5>paginator.num_pages:  # 大于最后一页    
            page_range=range(paginator.num_pages-10,paginator.num_pages+1)

        else:
            page_range=range(current_page_num-5,current_page_num+6)  # 当前页码,左边右边都是5页
    else:
        page_range=paginator.page_range
    页面代码:
    {% for item in page_range %}
View Code

精简示例

页面模板:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <!-- 最新版本的 Bootstrap 核心 CSS 文件 -->
    <link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
</head>
<body>



<ul>
    {% for book in current_page %}
    <li>{{ book.title }}:{{ book.price }}</li>
    {% endfor %}

</ul>


<nav aria-label="Page navigation">
  <ul class="pagination">
    {% if current_page.has_previous %}
    <li><a href="?page={{ current_page.previous_page_number  }}" aria-label="Previous"><span aria-hidden="true">上一页</span></a></li>
    {% else %}
    <li class="disabled"><a href="" aria-label="Previous"><span aria-hidden="true">上一页</span></a></li>
    {% endif %}



    {% for item in page_range %}

        {% if current_page_num == item %}
            <li class="active"><a href="?page={{ item }}">{{ item }}</a></li>
        {% else %}
            <li><a href="?page={{ item }}">{{ item }}</a></li>
        {% endif %}

    {% endfor %}



    {% if current_page.has_next %}
        <li><a href="?page={{ current_page.next_page_number  }}" aria-label="Next"><span aria-hidden="true">下一页</span></a>
    {% else %}
                <li class="disabled"><a href="" aria-label="Next"><span aria-hidden="true">下一页</span></a>
    {% endif %}
</li>
  </ul>
</nav>

</body>
</html>
View Code

视图代码:

from django.core.paginator import Paginator, EmptyPage


def index(request):
    # book_list = []
    # for i in range(100):
    #     book = BookPage(title="book_%s" % i, price=i * i)
    #     book_list.append(book)
    #
    #     BookPage.objects.bulk_create(book_list)
    # return HttpResponse("ok")
    book_list = BookPage.objects.all()

    # 分页器

    paginator = Paginator(book_list, 3)

    print("count:", paginator.count)  # 数据总数
    print("num_pages", paginator.num_pages)  # 总页数
    print("page_range", paginator.page_range)  # 页码的列表

    current_page_num = int(request.GET.get("page", 1))

    if paginator.num_pages > 11:

        if current_page_num - 5 < 1:
            page_range = range(1, 12)
        elif current_page_num + 5 > paginator.num_pages:
            page_range = range(paginator.num_pages - 10, paginator.num_pages + 1)

        else:
            page_range = range(current_page_num - 5, current_page_num + 6)
    else:
        page_range = paginator.page_range

    try:

        current_page = paginator.page(current_page_num)

        # 显示某一页具体数据的两种方式:
        print("object_list", current_page.object_list)
        for i in current_page:
            print(i)

    except EmptyPage as e:
        current_page = paginator.page(1)

    return render(request, "index_page.html", locals())
View Code

大佬视图:

from django.shortcuts import render,HttpResponse

# Create your views here.
from app01.models import *
from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger

def index(request):

    '''
    批量导入数据:

    Booklist=[]
    for i in range(100):
        Booklist.append(Book(title="book"+str(i),price=30+i*i))
    Book.objects.bulk_create(Booklist)
    '''

    '''
分页器的使用:

    book_list=Book.objects.all()

    paginator = Paginator(book_list, 10)

    print("count:",paginator.count)           #数据总数
    print("num_pages",paginator.num_pages)    #总页数
    print("page_range",paginator.page_range)  #页码的列表



    page1=paginator.page(1) #第1页的page对象
    for i in page1:         #遍历第1页的所有数据对象
        print(i)

    print(page1.object_list) #第1页的所有数据


    page2=paginator.page(2)

    print(page2.has_next())            #是否有下一页
    print(page2.next_page_number())    #下一页的页码
    print(page2.has_previous())        #是否有上一页
    print(page2.previous_page_number()) #上一页的页码



    # 抛错
    #page=paginator.page(12)   # error:EmptyPage

    #page=paginator.page("z")   # error:PageNotAnInteger

    '''


    book_list=Book.objects.all()

    paginator = Paginator(book_list, 10)
    page = request.GET.get('page',1)
    currentPage=int(page)


    try:
        print(page)
        book_list = paginator.page(page)
    except PageNotAnInteger:
        book_list = paginator.page(1)
    except EmptyPage:
        book_list = paginator.page(paginator.num_pages)


    return render(request,"index.html",{"book_list":book_list,"paginator":paginator,"currentPage":currentPage})
View Code

模型:

class BookPage(models.Model):
    title = models.CharField(max_length=32)
    price = models.DecimalField(decimal_places=2, max_digits=8)
View Code

Django的分页器(paginator)

基础知识

构造函数:

 Paginator(object_list, per_page, orphans=0, allow_empty_first_page=True) 

必传参数

object_list

 一个list,tuple,django的QuerySet,或者拥有``count()``或``__len__()``方法的 可分解对象 

per_page

每一页最大的对象个数。

可选参数

orphans

最后一页对象的最少数目,默认为0。 如果想避免最后一页显示太少。则可以使用这个值。 那么最后一页的数据,自动被前移一页。比如总共23个数据。每页显示 10. orphans=3 那么,第一页为10,第二页为13.

allow_empty_first_page

表示首页是否可以为空,如果是 False 而且``object_list`` 为空,那么会触发 EmptyPage 异常。

方法

 Paginator.page(number) 

根据索引number,返回一个’Page’对象,如果不存在,引起 InvalidPage异常

属性

 Paginator.count 

所有对象的总数, 尝试通过``object_list.count()``和``object_list.__len__()`` 取得

 Paginator.num_pages 

总共的页数

 Paginator.page_range 

页的范围,比如 [1, 2, 3, 4]

 

InvalidPage 异常

当页面不存在或者无效时,会引起``InvalidPage``异常,一般这个异常就够用,如果需要更 详细信息,还有``PageNotAnInteger``,``EmptyPage``可用:

PageNotAnInteger

page() 的参数非整数。

EmptyPage

page(x) ,第x页没数据。

上述两个都是 InvalidPage 的子类。 用一个简单的 except InvalidPage 就可以处理。

Page

Page(object_list, number, paginator):

一般不需用户自己构造,通过`Paginator.page` 生成。

方法

 Page.has_next() 

如果下一页存在,返回True。

 Page.has_previous() 

如果前一页存在返回 True

 Page.has_other_pages() 

如果上一页面或者下一页存在,返回``True``

 Page.next_page_number() 

返回下一页的索引,这个函数比较傻(不管下一页是否存在,都是简单的+1)

 Page.previous_page_number() 

返回上一页的索引,其他同上

 Page.start_index() 

返回当前页,第一个对象的索引。

 Page.end_index() 

道理同上。

属性

Page.object_list

当前页对象列表

Page.number

当前页的索引

Page.paginator

和page相关的分页类

示例代码:

view

from django.shortcuts import render,HttpResponse

# Create your views here.
from app01.models import *
from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger

def index(request):

    '''
    批量导入数据:

    Booklist=[]
    for i in range(100):
        Booklist.append(Book(title="book"+str(i),price=30+i*i))
    Book.objects.bulk_create(Booklist)
    '''

    '''
分页器的使用:

    book_list=Book.objects.all()

    paginator = Paginator(book_list, 10)

    print("count:",paginator.count)           #数据总数
    print("num_pages",paginator.num_pages)    #总页数
    print("page_range",paginator.page_range)  #页码的列表



    page1=paginator.page(1) #第1页的page对象
    for i in page1:         #遍历第1页的所有数据对象
        print(i)

    print(page1.object_list) #第1页的所有数据


    page2=paginator.page(2)

    print(page2.has_next())            #是否有下一页
    print(page2.next_page_number())    #下一页的页码
    print(page2.has_previous())        #是否有上一页
    print(page2.previous_page_number()) #上一页的页码



    # 抛错
    #page=paginator.page(12)   # error:EmptyPage

    #page=paginator.page("z")   # error:PageNotAnInteger

    '''


    book_list=Book.objects.all()

    paginator = Paginator(book_list, 10)
    page = request.GET.get('page',1)
    currentPage=int(page)


    try:
        print(page)
        book_list = paginator.page(page)
    except PageNotAnInteger:
        book_list = paginator.page(1)
    except EmptyPage:
        book_list = paginator.page(paginator.num_pages)


    return render(request,"index.html",{"book_list":book_list,"paginator":paginator,"currentPage":currentPage})
View Code

index.html:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" 
    integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
</head>
<body>

<div class="container">

    <h4>分页器</h4>
    <ul>

        {% for book in book_list %}
             <li>{{ book.title }} -----{{ book.price }}</li>
        {% endfor %}

     </ul>


    <ul class="pagination" id="pager">

                 {% if book_list.has_previous %}
                    <li class="previous"><a href="/index/?page={{ book_list.previous_page_number }}">上一页</a></li>
                 {% else %}
                    <li class="previous disabled"><a href="#">上一页</a></li>
                 {% endif %}


                 {% for num in paginator.page_range %}

                     {% if num == currentPage %}
                       <li class="item active"><a href="/index/?page={{ num }}">{{ num }}</a></li>
                     {% else %}
                       <li class="item"><a href="/index/?page={{ num }}">{{ num }}</a></li>

                     {% endif %}
                 {% endfor %}



                 {% if book_list.has_next %}
                    <li class="next"><a href="/index/?page={{ book_list.next_page_number }}">下一页</a></li>
                 {% else %}
                    <li class="next disabled"><a href="#">下一页</a></li>
                 {% endif %}

            </ul>
</div>



</body>
</html>
View Code

扩展

def index(request):


    book_list=Book.objects.all()

    paginator = Paginator(book_list, 15)
    page = request.GET.get('page',1)
    currentPage=int(page)

    #  如果页数十分多时,换另外一种显示方式
    if paginator.num_pages>11:

        if currentPage-5<1:
            pageRange=range(1,11)
        elif currentPage+5>paginator.num_pages:
            pageRange=range(currentPage-5,paginator.num_pages+1)

        else:
            pageRange=range(currentPage-5,currentPage+5)

    else:
        pageRange=paginator.page_range


    try:
        print(page)
        book_list = paginator.page(page)
    except PageNotAnInteger:
        book_list = paginator.page(1)
    except EmptyPage:
        book_list = paginator.page(paginator.num_pages)


    return render(request,"index.html",locals())
View Code

 

posted on 2018-08-20 14:34  风-fmgao  阅读(156)  评论(0编辑  收藏  举报