实现分页代码的封装,方便以后其他代码的调用
在project/app01/目录新建utils文件夹
文件夹下新建pagination.py文件
pagination.py
"""
自定义分页组件
以后如果想要使用这个分页组件，需要做：
在视图函数中：
from app01.utils.pagination import Pagination
def prettynum_list(request):
#1.根据自己的情况去筛选自己的数据
queryset = models.PrettyNum.objects.all()
#2.实例化分页对象
page_object = Pagination(request, queryset)
context = {
"search_data": search_data,
'queryset': page_object.page_queryset, #分完页的数据
"page_string": page_object.html() #生成的页码
}
#返回到前端页面
return render(request, 'prettynum_list.html', context)
在HTML页面中：
{% for obj in queryset %}
<tr>
<th>{{ obj.id }}</th>
<td>{{ obj.mobile }}</td>
<td>{{ obj.price }}</td>
<td>{{ obj.get_level_display }}</td>
<td>{{ obj.get_status_display }}</td>
<td>
<a class="btn btn-primary btn-xs" href="/prettynum/{{ obj.id }}/edit/">编辑</a>
<a class="btn btn-danger btn-xs" href="/prettynum/{{ obj.id }}/delete/">删除</a>
</td>
</tr>
{% endfor %}
<ul class="pagination" >
{{ page_string }}
</ul>
"""
from django.utils.safestring import mark_safe
class Pagination(object):
def __init__(self, request,queryset,page_size = 10, page_param="page", plus = 5):
"""
:param request:请求的对象
:param queryset:符合条件的数据(根据此数据进行分页处理)
:param page_size:每页显示多少条数据
:param page_param:获取在URL中传递的分页参数, 例如: /pretty/list/?page=21
:param plus:页码显示当前页的前几页后几页
"""
page = int(request.GET.get(page_param, 1))
# 如果不是整数
if type(page) != int:
# 强制让页码为1
page = 1
# if page.isdecimal():
# page = int(page)
# else:
# page = 1
self.page = page
self.page_size = page_size
self.start = (page - 1) * page_size
self.end = page * page_size
self.page_queryset = queryset[self.start:self.end]
# 获取到符合条件的数据的总条数
total_count = queryset.count()
total_page_count, div = divmod(total_count, page_size)
if div:
total_page_count += 1
self.total_page_count = total_page_count
self.plus = plus
def html(self):
# 计算出显示当前页的前5页、后5页
if self.total_page_count <= 2 * self.plus + 1:
# 数据库中的数据比较少，都没有达到11项
start_page = 1
end_page = self.total_page_count
else:
# 数据库中的数据比较多 大于11项
# 当前页小于5时, （小极值）
if self.page <= self.plus:
start_page = 1
end_page = 2 * self.plus + 1
else:
# 当前页>5
# 当前页+5>总页面
if (self.page + self.plus) > self.total_page_count:
start_page = self.total_page_count - 2 * self.plus
end_page = self.total_page_count
else:
start_page = self.page - self.plus
end_page = self.page + self.plus
# 页码
page_str_list = []
# 首页
page_str_list.append('<li><a href="/prettynum/list/?page={}">首页</a></li>'.format(1))
# 上一页
if self.page > 1:
prev = '<li><a href="/prettynum/list/?page={}">上一页</a></li>'.format(self.page - 1)
else:
prev = '<li><a href="/prettynum/list/?page={}">上一页</a></li>'.format(1)
page_str_list.append(prev)
# 页面
# range前取后不取，所以total_page_count+1
for i in range(start_page, end_page + 1):
# 给当前页加一个样式
if i == self.page:
ele = '<li class="active"><a href="/prettynum/list/?page={}">{}</a></li>'.format(i, i)
else:
ele = '<li><a href="/prettynum/list/?page={}">{}</a></li>'.format(i, i)
page_str_list.append(ele)
# 下一页
if self.page < self.total_page_count:
prev = '<li><a href="/prettynum/list/?page={}">下一页</a></li>'.format(self.page + 1)
else:
prev = '<li><a href="/prettynum/list/?page={}">下一页</a></li>'.format(self.total_page_count)
page_str_list.append(prev)
# 尾页
page_str_list.append('<li><a href="/prettynum/list/?page={}">尾页</a></li>'.format(self.total_page_count))
search_string = """
<li>
<form style="float: left; margin-left: -1px" method="get">
<input type="text" name="page"
style="position: relative; float: left; display: inline-block; width: 80px; border-radius: 0;"
class="form-control" placeholder="页码">
<button style="border-radius: 0" class="btn btn-default" type="submit">跳转</button>
</form>
</li>
"""
page_str_list.append(search_string)
page_string = mark_safe("".join(page_str_list))
return page_string
views.py
#实例化一个pagination
from app01.utils.pagination import Pagination
def prettynum_list(request):
"""靓号列表"""
data_dict = {}
search_data = request.GET.get('q', "")
if search_data:
data_dict[ "mobile__contains"] = search_data
queryset = models.PrettyNum.objects.filter(**data_dict).order_by("-level")
page_object = Pagination(request, queryset)
context = {
"search_data": search_data,
'queryset': page_object.page_queryset, #分完页的数据
"page_string": page_object.html() #生成的页码
}
return render(request, 'prettynum_list.html', context)
解决小BUG
在搜索 + 分页情况下
当我们进行搜索时,可以展示出搜索的对应数据
但是如果此时我们进行翻页,搜索条件将清空,重新展示所有的数据
这样是不符合逻辑的分页时，应保留原来的搜索条件
http://127.0.0.1:8000/prettynum/list/?q=88 #搜索http://127.0.0.1:8000/prettynum/list/?page=30 #分页http://127.0.0.1:8000/prettynum/list/?q=88&page=30 #搜索+分页
pagination.py
"""
自定义分页组件
以后如果想要使用这个分页组件，需要做：
在视图函数中：
from app01.utils.pagination import Pagination
def prettynum_list(request):
#1.根据自己的情况去筛选自己的数据
queryset = models.PrettyNum.objects.all()
#2.实例化分页对象
page_object = Pagination(request, queryset)
context = {
"search_data": search_data,
'queryset': page_object.page_queryset, #分完页的数据
"page_string": page_object.html() #生成的页码
}
#返回到前端页面
return render(request, 'prettynum_list.html', context)
在HTML页面中：
{% for obj in queryset %}
<tr>
<th>{{ obj.id }}</th>
<td>{{ obj.mobile }}</td>
<td>{{ obj.price }}</td>
<td>{{ obj.get_level_display }}</td>
<td>{{ obj.get_status_display }}</td>
<td>
<a class="btn btn-primary btn-xs" href="/prettynum/{{ obj.id }}/edit/">编辑</a>
<a class="btn btn-danger btn-xs" href="/prettynum/{{ obj.id }}/delete/">删除</a>
</td>
</tr>
{% endfor %}
<ul class="pagination" >
{{ page_string }}
</ul>
"""
from django.utils.safestring import mark_safe
class Pagination(object):
def __init__(self, request,queryset,page_size = 10, page_param="page", plus = 5):
"""
:param request:请求的对象
:param queryset:符合条件的数据(根据此数据进行分页处理)
:param page_size:每页显示多少条数据
:param page_param:获取在URL中传递的分页参数, 例如: /pretty/list/?page=21
:param plus:页码显示当前页的前几页后几页
"""
import copy
query_dict = copy.deepcopy(request.GET)
query_dict._mutable = True
self.query_dict = query_dict
self.page_param = page_param
page = request.GET.get(page_param, 1)
# 如果不是整数
if type(page) != int:
# 强制让页码为1
page = 1
# if page.isdecimal():
# page = int(page)
# else:
# page = 1
self.page = page
self.page_size = page_size
self.start = (page - 1) * page_size
self.end = page * page_size
self.page_queryset = queryset[self.start:self.end]
# 获取到符合条件的数据的总条数
total_count = queryset.count()
total_page_count, div = divmod(total_count, page_size)
if div:
total_page_count += 1
self.total_page_count = total_page_count
self.plus = plus
def html(self):
# 计算出显示当前页的前5页、后5页
if self.total_page_count <= 2 * self.plus + 1:
# 数据库中的数据比较少，都没有达到11项
start_page = 1
end_page = self.total_page_count
else:
# 数据库中的数据比较多 大于11项
# 当前页小于5时, （小极值）
if self.page <= self.plus:
start_page = 1
end_page = 2 * self.plus + 1
else:
# 当前页>5
# 当前页+5>总页面
if (self.page + self.plus) > self.total_page_count:
start_page = self.total_page_count - 2 * self.plus
end_page = self.total_page_count
else:
start_page = self.page - self.plus
end_page = self.page + self.plus
# 页码
page_str_list = []
self.query_dict.setlist(self.page_param, [1])
# 首页
page_str_list.append('<li><a href="?{}">首页</a></li>'.format(self.query_dict.urlencode()))
# 上一页
if self.page > 1:
self.query_dict.setlist(self.page_param, [self.page - 1])
prev = '<li><a href="?{}">上一页</a></li>'.format(self.query_dict.urlencode())
else:
self.query_dict.setlist(self.page_param, [1])
prev = '<li><a href="?{}">上一页</a></li>'.format(self.query_dict.urlencode())
page_str_list.append(prev)
# 页面
# range前取后不取，所以total_page_count+1
for i in range(start_page, end_page + 1):
self.query_dict.setlist(self.page_param, [i])
# 给当前页加一个样式
if i == self.page:
ele = '<li class="active"><a href="?{}">{}</a></li>'.format(self.query_dict.urlencode(), i)
else:
ele = '<li><a href="?{}">{}</a></li>'.format(self.query_dict.urlencode(), i)
page_str_list.append(ele)
# 下一页
if self.page < self.total_page_count:
self.query_dict.setlist(self.page_param, [self.page + 1])
prev = '<li><a href="?{}">下一页</a></li>'.format(self.query_dict.urlencode())
else:
self.query_dict.setlist(self.page_param, [self.total_page_count])
prev = '<li><a href="?{}">下一页</a></li>'.format(self.query_dict.urlencode())
page_str_list.append(prev)
# 尾页
self.query_dict.setlist(self.page_param, [self.total_page_count])
page_str_list.append('<li><a href="?{}">尾页</a></li>'.format(self.query_dict.urlencode()))
search_string = """
<li>
<form style="float: left; margin-left: -1px" method="get">
<input type="text" name="page"
style="position: relative; float: left; display: inline-block; width: 80px; border-radius: 0;"
class="form-control" placeholder="页码">
<button style="border-radius: 0" class="btn btn-default" type="submit">跳转</button>
</form>
</li>
"""
page_str_list.append(search_string)
page_string = mark_safe("".join(page_str_list))
return page_string
浏览器访问测试
标签：count,封装,分页,self,list,param,total,page From： https://www.cnblogs.com/kekeeleven/p/17771778.html