Django中的分页
方法一：views
def books(request):
# url取page参数书
page_num = request.GET.get(‘page‘)
print(page_num, type(page_num))
# 总页码数
total_count = models.Book.objects.all().count()
# 每页显示多少条数据
per_page = 10
# 总共需要多少页码展示
total_page, m = divmod(total_count, per_page)
if m:
total_page += 1
try:
page_num = int(page_num)
if page_num > total_page:
page_num = total_page
except Exception as e:
# 页码不是数字,默认返回第一页
page_num = 1
# 定义两个变量保存数据从取到哪儿
data_start = (page_num - 1) * 10
data_end = page_num * 10
# 页面上最多展示多少个页码
max_page = 11
if total_page < max_page:
max_page = total_page
half_max_page = max_page // 2
# 页码上展示的页码从哪儿开始
page_start = page_num - half_max_page
# 页面展示到哪儿结束
page_end = page_num + half_max_page
# 如果当前页面减一半，比1还小
if page_start <= 1:
page_start = 1
page_end = max_page
# 如果当前页 加 一半 比总页码数还大
if page_end >= total_page:
page_end = total_page
page_start = total_page - max_page
all_book = models.Book.objects.all()[data_start:data_end]
# 自己拼接分页的代码
html_str_list = []
# 加上第一页(首页)
html_str_list.append(‘<li><a href="/books/?page=1">首页</a></li>‘)
# 判断一下，如果是第一页，就没有上一页
if page_num <= 1:
html_str_list.append(
‘<li class="disabled"><a href="#"> <span aria-hidden="true">«</span></a></li>‘.format(
page_num - 1))
else:
html_str_list.append(
‘<li><a href="/books/?page={}"> <span aria-hidden="true">«</span></a></li>‘.format(page_num - 1))
for i in range(page_start, page_end + 1):
tmp = ‘<li> <a href="/books/?page={0}">{0}</a></li>‘.format(i)
html_str_list.append(tmp)
# 加一个下一页的标签(下一页)
# 判断是否是最后一页
if page_num >= total_page:
html_str_list.append(
‘<li class="disabled" ><a href="#"> <span aria-hidden="true">»</span></a></li>‘)
else:
html_str_list.append(
‘<li><a href="/books/?page={}"> <span aria-hidden="true">»</span></a></li>‘.format(page_num + 1))
# 加上最后一页(尾页)
html_str_list.append(‘<li><a href="/books/?page={}">尾页</a></li>‘.format(total_page))
page_html = "".join(html_str_list)
return render(request, "books.html",
{‘books‘: all_book, "page_html": page_html})book.HTML
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>书籍列表</title>
<link rel="stylesheet" href="/static/bootstrap/css/bootstrap.min.css">
</head>
<body>
<div class="container">
<table class="table table-bordered">
<thead>
<tr>
<th>序号</th>
<th>ID</th>
<th>书名</th>
</tr>
</thead>
<tbody>
{% for book in books %}
<tr>
<td>{{ forloop.counter }}</td>
<td>{{ book.id }}</td>
<td>{{ book.title }}</td>
</tr>
{% endfor %}
</tbody>
</table>
<nav aria-label="Page navigation">
<ul class="pagination">
<li>
{{ page_html|safe }}
</li>
</ul>
</nav>
</div>
</body>
</html>方法二：利用封装
创建文件utils文件
mypage
class Page():
def __init__(self, page_num, total_count, url_prefix, per_page=10, max_page=11):
"""
:param page_num: 当前页码数
:param total_count: 数据总数
:param url_prefix: a标签href的前缀
:param per_page: 每页显示多少条数据
:param max_page: 页面上最多显示几个页码
"""
self.url_prefix = url_prefix
self.max_page = max_page
# 每一页显示多少条数据
# 总共需要多少页码来展示
total_page, m = divmod(total_count, per_page)
if m:
total_page += 1
self.total_page = total_page
try:
page_num = int(page_num)
# 如果输入的页码数超过了最大的页码数，默认返回最后一页
if page_num > total_page:
page_num = total_page
except Exception as e:
# 当输入的页码不是正经数字的时候 默认返回第一页的数据
page_num = 1
self.page_num = page_num
# 定义两个变量保存数据从哪儿取到哪儿
self.data_start = (page_num - 1) * 10
self.data_end = page_num * 10
# 页面上总共展示多少页码
if total_page < self.max_page:
self.max_page = total_page
half_max_page = self.max_page // 2
# 页面上展示的页码从哪儿开始
page_start = page_num - half_max_page
# 页面上展示的页码到哪儿结束
page_end = page_num + half_max_page
# 如果当前页减一半 比1还小
if page_start <= 1:
page_start = 1
page_end = self.max_page
# 如果 当前页 加 一半 比总页码数还大
if page_end >= total_page:
page_end = total_page
page_start = total_page - self.max_page + 1
self.page_start = page_start
self.page_end = page_end
@property
def start(self):
return self.data_start
@property
def end(self):
return self.data_end
def page_html(self):
# 自己拼接分页的HTML代码
html_str_list = []
# 加上第一页
html_str_list.append(‘<li><a href="{}?page=1">首页</a></li>‘.format( self.url_prefix))
# 判断一下 如果是第一页，就没有上一页
if self.page_num <= 1:
html_str_list.append(‘<li class="disabled"><a href="#"><span aria-hidden="true">«</span></a></li>‘.format(self.page_num-1))
else:
# 加一个上一页的标签
html_str_list.append(‘<li><a href="{}?page={}"><span aria-hidden="true">«</span></a></li>‘.format( self.url_prefix, self.page_num-1))
for i in range(self.page_start, self.page_end+1):
# 如果是当前页就加一个active样式类
if i == self.page_num:
tmp = ‘<li class="active"><a href="{0}?page={1}">{1}</a></li>‘.format(self.url_prefix, i)
else:
tmp = ‘<li><a href="{0}?page={1}">{1}</a></li>‘.format( self.url_prefix, i)
html_str_list.append(tmp)
# 加一个下一页的按钮
# 判断，如果是最后一页，就没有下一页
if self.page_num >= self.total_page:
html_str_list.append(‘<li class="disabled"><a href="#"><span aria-hidden="true">»</span></a></li>‘)
else:
html_str_list.append(‘<li><a href="{}?page={}"><span aria-hidden="true">»</span></a></li>‘.format( self.url_prefix, self.page_num+1))
# 加最后一页
html_str_list.append(‘<li><a href="{}?page={}">尾页</a></li>‘.format( self.url_prefix, self.total_page))
page_html = "".join(html_str_list)
return page_html封装代码
views
def depts(request):
page_num = request.GET.get(‘page‘)
print(page_num, type(page_num))
# 总页码
total_count = models.Dept.objects.all().count()
from utils.mypage import Page
page_obj = Page(page_num, total_count, per_page=10, url_prefix="/depts/", max_page=11, )
ret = models.Book.objects.all()[page_obj.start:page_obj.end]
print(ret)
page_html = page_obj.page_html()
return render(request,"dept.html",{‘dept‘:ret,‘page_html‘:page_html})视图
html代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>部门列表</title>
<link rel="stylesheet" href="/static/bootstrap/css/bootstrap.min.css">
</head>
<body>
<div class="container">
<table class="table table-bordered">
<thead>
<tr>
<th>序号</th>
<th>id</th>
<th>部门名</th>
</tr>
</thead>
<tbody>
{% for dept in depts %}
<tr>
<td>{{ forloop.counter }}</td>
<td>{{ dept.id }}</td>
<td>{{ dept.name }}</td>
</tr>
{% endfor %}
</tbody>
</table>
<nav aria-label="Page navigation">
<ul class="pagination">
{{ page_html|safe }}
</ul>
</nav>
</div>
</body>