分页器
使用方法：
# 导入
from django.core.paginator import Paginator
# 在视图函数中
def test(request):
book_list = Book.objects.all() # 所有书籍对象
# 实例化出一个对象，第一个参数是要分页的书籍对象，第二个参数是每页多少条数据
paginator = Paginator(book_list，10)
# -----------------------------对象内的属性----------------------------
# 数据总条数--100条
print(paginator.count)
# 总页数--10页
print(paginator.num_pages)
# 页码数的列表
print(paginator.page_range)
# 取到第 x 页 ,返回一个Page对象
current_page=paginator.page(5)
# 当前页码内所有的数据
print(current_page.object_list)
# 是否有下一页
print(current_page.has_next())
# 是否有上一页
print(current_page.has_previous())
# 下一页页码数
print(current_page.next_page_number())
# 上一页的页码数
print(current_page.previous_page_number())
简单小案例：
视图函数页面
# views.py
def test(request):
book_list = models.Book.objects.all()
paginator = Paginator(book_list, 5)
try:
# 通过GET请求方式取出当前页码数
current_page_num = int(request.GET.get('page'))
# 通过当前页码数，返回一个page对象
current_page = paginator.page(current_page_num)
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
except Exception as e:
current_page_num = 1
return render(request, 'test.html', locals())
html页面
<!-- html页面 -->
<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8">
<script src="/static/jquery-3.3.1.js"></script>
<link rel="stylesheet" href="/static/bootstrap-3.3.7-dist/css/bootstrap.css">
<title>图书</title>
</head>
<body>
<div class="container-fluid">
<div class="row">
<div class="col-md-6 col-md-offset-3">
<nav aria-label="Page navigation">
<ul class="pagination">
{% if current_page.has_previous %}
<li>
<a href="/test/?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 foo in page_range %}
{% if current_page_num == foo %}
<li class="active"><a href="/test/?page={{ foo }}">{{ foo }}</a></li>
{% else %}
<li><a href="/test/?page={{ foo }}">{{ foo }}</a></li>
{% endif %}
{% endfor %}
{% if current_page.has_next %}
<li>
<a href="/test/?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="Next">
<span aria-hidden="true">下一页</span>
</a>
</li>
{% endif %}
</ul>
</nav>
<table class="table table-striped">
<thead>
<tr>
<th>书籍名</th>
<th>书籍价格</th>
</tr>
</thead>
<tbody>
{% for book in current_page %}
<tr>
<td>{{ book.name }}</td>
<td>{{ book.price }}</td>
</tr>
{% endfor %}
</tbody>
</table>
</div>
</div>
</div>
</body>
</html>
HTML页面讲解：
<table class="table table-striped">
<thead>
<tr>
<th>书籍名</th>
<th>书籍价格</th>
</tr>
</thead>
<tbody>
<!-- current_page 是当前页所包含的书籍对象，从后台传过来 -->
{% for book in current_page %}
<tr>
<td>{{ book.name }}</td>
<td>{{ book.price }}</td>
</tr>
{% endfor %}
</tbody>
</table>
上下页：
<!-- 下一页与上一页相同，判断是否有下一页 -->
<!-- 判断是否有上一页，如果没有，禁用上一页，并且将 a标签 里的 href 清空 -->
{% if current_page.has_previous %}
<li>
<a href="/test/?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 %}
<!-- page_range指的是显示区间，比如当前页为9，显示左5右5，显示区间就是range(4,15)，顾头不顾尾 -->
{% for foo in page_range %}
<!-- 如果当前页数与遍历出的页数相等，则该页数为活跃状态，添加 active -->
{% if current_page_num == foo %}
<li class="active"><a href="/test/?page={{ foo }}">{{ foo }}</a></li>
{% else %}
<li><a href="/test/?page={{ foo }}">{{ foo }}</a></li>
{% endif %}
{% endfor %}
==================================================================
分页器模板
<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 foo in page_range %}
{% if current_page_num == foo %}
<li class="active"><a href="/?page={{ foo }}">{{ foo }}</a></li>
{% else %}
<li><a href="/?page={{ foo }}">{{ foo }}</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="Next">
<span aria-hidden="true">下一页</span>
</a>
</li>
{% endif %}
</ul>
</nav>
后台代码
# 分页器
paginator = Paginator(article_list, 3)
try:
current_page_num = int(request.GET.get('page'))
current_page = paginator.page(current_page_num)
except Exception as e:
current_page_num = 1
current_page = paginator.page(current_page_num)
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
