Django 入门之分页

Django 组件之分页 – LePeng

Django的分页器（paginator）

view

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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})

index.html:

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<!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>

扩展

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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>30:

        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())

自定义分页器

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"""
分页组件使用示例：
    obj = Pagination(request.GET.get('page',1),len(USER_LIST),request.path_info)
    page_user_list = USER_LIST[obj.start:obj.end]
    page_html = obj.page_html()

    return render(request,'index.html',{'users':page_user_list,'page_html':page_html})
"""

class Pagination(object):

    def __init__(self,current_page,all_count,base_url,per_page_num=2,pager_count=11):
        """
        封装分页相关数据
        :param current_page: 当前页
        :param all_count:    数据库中的数据总条数
        :param per_page_num: 每页显示的数据条数
        :param base_url:     分页中显示的URL前缀
        :param pager_count:  最多显示的页码个数
        """

        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

        self.base_url = base_url

        # 总页码
        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):
        # 如果总页码 < 11个：
        if self.all_pager <= self.pager_count:
            pager_start = 1
            pager_end = self.all_pager + 1
        # 总页码  > 11
        else:
            # 当前页如果<=页面上最多显示11/2个页码
            if self.current_page <= self.pager_count_half:
                pager_start = 1
                pager_end = self.pager_count + 1

            # 当前页大于5
            else:
                # 页码翻到最后
                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 = []

        first_page = '<li><a href="%s?page=%s">首页</a></li>' % (self.base_url,1,)
        page_html_list.append(first_page)

        if self.current_page <= 1:
            prev_page = '<li class="disabled"><a href="#">上一页</a></li>'
        else:
            prev_page = '<li><a href="%s?page=%s">上一页</a></li>' % (self.base_url,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="%s?page=%s">%s</a></li>' % (self.base_url,i, i,)
            else:
                temp = '<li><a href="%s?page=%s">%s</a></li>' % (self.base_url,i, i,)
            page_html_list.append(temp)

        if self.current_page >= self.all_pager:
            next_page = '<li class="disabled"><a href="#">下一页</a></li>'
        else:
            next_page = '<li><a href="%s?page=%s">下一页</a></li>' % (self.base_url,self.current_page + 1,)
        page_html_list.append(next_page)

        last_page = '<li><a href="%s?page=%s">尾页</a></li>' % (self.base_url,self.all_pager,)
        page_html_list.append(last_page)

        return ''.join(page_html_list)

我自己的分页器

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class Pagination(object):

    def __init__(self, request, data_num, per_page=3, max_show=3):
        """
        进行初始化. 
        :param request: 当前request对象
        :param data_num: 数据总数 
        :param current_page: 当前页 
        :param per_page: 每页显示多少条数据 
        :param max_show: 页面最多显示多少个页码 
        """
        self.data_num = data_num
        self.current_page = request.GET.get('page', 1)
        self.url_prefix = request.path
        self.params = request.GET
        self.per_page = per_page
        self.max_show = max_show

        # 把页码数算出来
        self.page_num, more = divmod(self.data_num, per_page)
        if more:
            self.page_num += 1

        # 如果数据库条数比最大页数小，用数据库的
        if self.page_num< self.max_show:
            self.max_show = self.page_num

        try:
            self.current_page = int(self.current_page)
        except Exception:
            self.current_page = 1
        # 如果URL传过来的页码数是负数
        if self.current_page <= 0:
            self.current_page = 1 # 如果URL传过来的页码数超过了最大页码数 
        elif self.current_page > self.page_num:
            self.current_page = self.page_num  # 默认展示最后一页

        # 页码数的一半 算出来
        self.half_show = max_show // 2

        # 页码最左边显示多少
        if self.current_page - self.half_show <= 1:
            self.page_start = 1 
            self.page_end = self.max_show 
        elif self.current_page + self.half_show >= self.page_num:  # 如果右边越界
            self.page_end = self.page_num
            self.page_start = self.page_num - self.max_show
            if self.page_start < 1:
                self.page_start = 1
        else:
            self.page_start = self.current_page - self.half_show
            # 页码最右边显示
            self.page_end = self.current_page + self.half_show

        # params{"page":"12","title_startwith":"py","id__gt":"5"}
        # params.urlencode-----> "page=12&title_startwith=py&id__gt=5"
        import copy
        self.params = copy.deepcopy(self.params)
        print(self.params.urlencode())

    @property
    def start(self):
        # 数据从哪儿开始切
        return (self.current_page - 1) * self.per_page

    @property
    def end(self):
        # 数据切片切到哪儿
        return self.current_page * self.per_page

    def page_html(self):
        # 生成页码
        l = []

        # 1.加一个首页
        self.params['page'] = 1
        l.append('<li><a href="{}?{}">首页</a></li>'.format(self.url_prefix, self.params.urlencode()))

        # 2.加一个上一页
        if self.current_page == 1:
            l.append('<li class="disabled" ><a href="#">«</a></li>'.format(self.current_page))
        else:
            self.params['page'] = self.current_page - 1
            l.append('<li><a href="{}?{}">«</a></li>'.format(self.url_prefix, self.params.urlencode()))

        # 3.中间页码
        for i in range(self.page_start, self.page_end + 1):
            self.params['page'] = i
            if i == self.current_page:
                tmp = '<li class="active"><a href="{0}?{1}">{2}</a></li>'.format(self.url_prefix,self.params.urlencode(), i)
            else:
                tmp = '<li><a href="{0}?{1}">{2}</a></li>'.format(self.url_prefix, self.params.urlencode(), i)
            l.append(tmp)

        # 4.加一个下一页
        if self.current_page == self.page_num:
            l.append('<li class="disabled"><a href="#">»</a></li>'.format(self.current_page))
        else:
            self.params['page'] = self.current_page + 1
            l.append('<li><a href="{}?{}">»</a></li>'.format(self.url_prefix, self.params.urlencode()))

        # 5.加一个尾页
        self.params['page'] = self.page_num
        l.append('<li><a href="{}?{}">尾页</a></li>'.format(self.url_prefix, self.params.urlencode()))
   return "".join(l)

Django内置分页

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# 内置分页view 部分
from django.shortcuts import render
from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger

L = []
for i in range(999):
    L.append(i)

def index(request):
    current_page = request.GET.get('p')

    paginator = Paginator(L, 10)
    # per_page: 每页显示条目数量
    # count:    数据总个数
    # num_pages:总页数
    # page_range:总页数的索引范围，如: (1,10),(1,200)
    # page:     page对象
    try:
        posts = paginator.page(current_page)
        # has_next              是否有下一页
        # next_page_number      下一页页码
        # has_previous          是否有上一页
        # previous_page_number  上一页页码
        # object_list           分页之后的数据列表
        # number                当前页
        # paginator             paginator对象
    except PageNotAnInteger:
        posts = paginator.page(1)
    except EmptyPage:
        posts = paginator.page(paginator.num_pages)
    return render(request, 'index.html', {'posts': posts})
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# 内置分页html部分
<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
</head>
<body>
<ul>
    {% for item in posts %}
        <li>{{ item }}</li>
    {% endfor %}
</ul>

<div class="pagination">
      <span class="step-links">
        {% if posts.has_previous %}
            <a href="?p={{ posts.previous_page_number }}">Previous</a>
        {% endif %}
          <span class="current">
            Page {{ posts.number }} of {{ posts.paginator.num_pages }}.
          </span>
          {% if posts.has_next %}
              <a href="?p={{ posts.next_page_number }}">Next</a>
          {% endif %}
      </span>

</div>
</body>
</html>
Python > Django
#Python #Django
Django 入门之分页
https://flepeng.github.io/021-Python-32-框架-Django-Django-入门之分页/
作者
Lepeng
发布于
2021年8月8日
许可协议