分页
Django的分页器（paginator）
view
1 def index(request):
2 # 创建数据
3 # book_list = [Book(title=‘Hello Python‘,price=price) for price in range(100)]
4 # res = Book.objects.bulk_create(book_list) # 批量创建，效率高
5 # print(res)
6 book_list = Book.objects.all()
7 # return HttpResponse(‘ok‘)
8
9 paginator = Paginator(book_list, 5)
10
11 # 打印
12 print(‘数据总数：‘, paginator.count) # 100
13 print(‘总页数：‘, paginator.num_pages) # 10
14 print(‘页码列表：‘, paginator.page_range) # range(1, 11)
15
16 current_page_num = int(request.GET.get(‘page‘, 1))
17 if paginator.num_pages > 11:
18 if current_page_num - 5 < 1:
19 p1 = 1
20 p2 = 11
21 elif current_page_num + 5 > paginator.num_pages:
22 p1 = paginator.num_pages - 10
23 p2 = paginator.num_pages + 1
24 else:
25 p1 = current_page_num - 5
26 p2 = current_page_num + 6
27 page_range = range(p1, p2)
28 else:
29 page_range = paginator.page_range
30 try:
31 current_page = paginator.page(current_page_num) # 第几页的数据
32 except EmptyPage as e:
33 current_page = paginator.page(1)
34 return render(request, ‘book_list.html‘, locals())
<!DOCTYPE html>
<html lang="zh_CN">
<head>
<meta charset="UTF-8">
<meta http-equiv="x-ua-compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>书籍列表</title>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css"
integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
</head>
<body>
<ul>
{% for book in current_page %}
<li>名称：{{ book.title }}----价格：{{ book.price }}</li>
<br>
{% 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 num in page_range %}
{% if current_page_num == num %}
<li class="active"><a href="?page={{ num }}">{{ num }}</a></li>
{% else %}
<li><a href="?page={{ num }}">{{ num }}</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></li>
{% else %}
<li class="disabled">
<a href="" aria-label="Previous"><span aria-hidden="true">上一页</span></a>
</li>
{% endif %}
</ul>
</nav>
</body>
</html>
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>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
"""
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)
