自定义分页器

推导

current_page = request.GET.get("page",1)  # 获取用户访问的页码，没有则默认展示第一页
try:  # 由于后端接收到的前端数据是字符串类型所以做类型转换处理加异常捕获
	current_page = int(current_page)
except Exception as e:
	current_page = 1
per_page_num = 10 # 定义页面展示10条数据
start_page = (current_page - 1) * per_page_num  # 需要对总数据进行切片操作，需要确定切片起始位置和终止位置
end_page =  current_page* per_page_num
# 确定需要多少页来展示数据
book_queryset = models.Book.objects.all()
all_count = book_queryset.count()  # 数据总条数
page_num, more = divmod(all_count, per_page_num)
if more:  # 有余数则总页数加一
	page_num += 1
book_list = models.Book.objects.all()[start_page:end_page]  # 对总数据进行切片操作
# 在后端生成bootstrap分页器代码传递给前端
html = ''
xxx = current_page
if current_page < 6:
	xxx = 6
for i in range(xxx-5,xxx+6):
	if i == current_page:
		html += '<li class="active"><a href="?page=%s" >%s</a></li>'% (i, i)
	else:
		html += '<li><a href="?page=%s">%s</a></li>' % (i, i)
return render(request,'booklist.html',locals())

前端代码

{% for book in book_list %}
	<p>{{ book.title }}</p>
{% endfor %}
{{ html|safe }}

自定义分页器封装代码

# app01下新建一个utils文件夹下新建mypager.py
class Pagination(object):
    def __init__(self, current_page, all_count, 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 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
 
        # 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 = []
        # 添加前面的nav和ul标签
        page_html_list.append('''
                    <nav aria-label='Page navigation>'
                    <ul class='pagination'>
                ''')
        first_page = '<li><a href="?page=%s">首页</a></li>' % (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="?page=%s">上一页</a></li>' % (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="?page=%s">%s</a></li>' % (i, i,)
            else:
                temp = '<li><a href="?page=%s">%s</a></li>' % (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="?page=%s">下一页</a></li>' % (self.current_page + 1,)
        page_html_list.append(next_page)
 
        last_page = '<li><a href="?page=%s">尾页</a></li>' % (self.all_pager,)
        page_html_list.append(last_page)
        # 尾部添加标签
        page_html_list.append('''
                                           </nav>
                                           </ul>
                                       ''')
        return ''.join(page_html_list)

自定义分页器使用

后端

from app01.utils.mypager import Pagination
def get_book(request):
	book_list = models.Book.objects.all()
	current_page = request.GET.get("page",1)
	all_count = book_list.count()
	page_obj = Pagination(current_page=current_page,all_count=all_count,per_page_num=10,pager_count=9)
 	page_queryset = book_list[page_obj.start:page_obj.end]
	return render(request,'booklist.html',locals())

前端

<div class="container">
    <div class="row">
        <div class="col-md-8 col-md-offset-2">
            {% for book in page_queryset %}
            <p>{{ book.title }}</p>
            {% endfor %}
            {{ page_obj.page_html|safe }}
        </div>
    </div>
</div>