django自定义分页器

一 django 的分页器

1 批量创建数据

    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)

2 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

3 view

from django.shortcuts import render,HttpResponse


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

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>

提高弹性显示页码

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())

二自定义分页器源码

import copy
class Paginator:
    def __init__(self,request,total_count,current_page=1,per_page_data_num=5,show_page_num=11):
        self.total_count=total_count #数据总数
        self.per_page_data_num=per_page_data_num  #每页的数据个数  5
        self.show_page_num=show_page_num  #显示页面个数 11
        self.request=request
        self.params=self.get_params
        try:
            current_page = int(current_page)
            if current_page < 1:
                self.current_page = 1
            elif current_page>self.get_page_num:
                self.current_page = 1
            else:
                self.current_page = current_page
        except Exception as e:
            self.current_page = 1
        self.half_num=self.show_page_num//2

    @property
    def get_params(self):
        params = copy.deepcopy(self.request.GET)
        return params

    @property
    def get_page_num(self):
        p_num,mod=divmod(self.total_count,self.per_page_data_num)
        if mod:
            p_num+=1
        return p_num

    @property
    def start(self):
        return self.per_page_data_num*(self.current_page-1)

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

    def html(self):
        page_num_list=[]
        # print(self.get_page_num)

        #页码四种情况配置
        if self.get_page_num<self.show_page_num:
            show_start=1
            show_end=self.get_page_num+1
        else:
            if self.current_page<=self.half_num:
                    show_start = 1
                    show_end = self.show_page_num+1
            elif self.current_page + self.half_num >= self.get_page_num:
                show_start = self.get_page_num - self.show_page_num + 1
                show_end = self.get_page_num + 1
            else:
                show_start=self.current_page-self.half_num
                show_end=self.current_page+self.half_num+1

        # 首页
        self.params['page']=1
        first_page = r'<nav aria-label="Page navigation"><ul class="pagination"><li><a href="?%s">首页</a></li>' %(self.params.urlencode(),)
        page_num_list.append(first_page)
        # 上一页
        if self.current_page == 1:
            previous_num = r'<li class="disabled"><a >上一页</a></li>'
        else:
            self.params['page'] = self.current_page-1
            previous_num = r'<li><a href="?%s">上一页</a></li>' % (self.params.urlencode(),)
        page_num_list.append(previous_num)

        #页码显示
        for i in range(show_start,show_end):
            self.params['page'] = i
            if i==self.current_page:
                li_num = '<li class="active"><a href="?%s">%s</a></li>' % (self.params.urlencode(), i,)
            else:
                li_num='<li><a href="?%s">%s</a></li>'%(self.params.urlencode(),i,)
            page_num_list.append(li_num)

        # 下一页
        if self.current_page == self.get_page_num:
            next_num = '<li class="disabled"><a >下一页</a></li>'
        else:
            self.params['page'] = self.current_page+1
            next_num = '<li><a href="?%s">下一页</a></li>' % (self.params.urlencode(),)
        page_num_list.append(next_num)

        # 尾页
        self.params['page'] = self.get_page_num
        last_page = '<li><a href="?%s">尾页</a></li></ul></nav>' % (self.params.urlencode(),)
        page_num_list.append(last_page)
        return "".join(page_num_list)

调用方式

from django.shortcuts import render
from app01.models import Book
from page import Paginator

def index(request):
    #批量创建数据
    # book_list=[]
    # for i in range(1,101):
    #     book=Book(title="书籍%s"%(i,),price=random.randint(50,300))
    #     book_list.append(book)
    # Book.objects.bulk_create(book_list)
    data_list=Book.objects.all()
    current_page=request.GET.get('page')
    paginator=Paginator(request,total_count=data_list.count(),current_page=current_page)
    data_list=data_list[paginator.start:paginator.end]
    return render(request,'index.html',{"data_list":data_list,"paginator":paginator})

index.html

<!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.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css"
          integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">

</head>
<body>
    <ul>
    {#数据显示#}
        {% for data in data_list %}
            <li>{{ data.title }}----{{ data.price }}</li>
        {% endfor %}
    </ul>
    {#页码显示#}
    {{ paginator.html|safe }}
</body>
</html>

django自定义分页器

一 django 的分页器

1 批量创建数据

2 分页器的使用

3 view

index.html

提高 弹性显示页码

二 自定义分页器源码

调用方式

index.html

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提高弹性显示页码

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