Django中封装分页组件
(1) 定义Paginator类
from django.utils.safestring import mark_safe
class Paginator(object):
"""
初始化参数说明:
request:请求对象
data:查询到的符合条件的数据
search_data:搜索框收索的关键字,解决收索情况下分页的BUG
page_parm:分页请求的参数名称,例如:http://127.0.0.1:8000/phonenum/list/?page=2&q=
page_size:每页显示的数据量
plus:当前页分页按钮的两边显示的按钮数量
"""
def __init__(self, request, data, search_data, page_parm="page", page_size=15, plus=5):
page = request.GET.get(page_parm, "")
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.data = data[self.start:self.end]
total_count = data.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
self.search_data = search_data
self.page_parm = page_parm
# 生成html标签
def Html(self):
if self.total_page_count <= 2 * self.plus + 1:
start_page = 1
end_page = self.total_page_count
else:
if self.page < self.plus:
start_page = 1
end_page = 2 * self.plus
else:
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
# 分页按钮
page_str_list = []
# 首页
first_page = '<li><a href="?{}={}&q={}">首页</a></li>'.format(self.page_parm, 1, self.search_data)
page_str_list.append(first_page)
# 上一页
if self.page > 1:
pre = '<li><a href="?{}={}&q={}">上一页</a></li>'.format(self.page_parm, self.page - 1, self.search_data)
else:
pre = '<li><a href="?{}={}&q={}">上一页</a></li>'.format(self.page_parm, 1, self.search_data)
page_str_list.append(pre)
for i in range(start_page, end_page + 1):
if i == self.page:
ele = '<li class="active"><a href="?{}={}&q={}">{}</a></li>'.format(self.page_parm, i, self.search_data,
i)
else:
ele = '<li><a href="?{}={}&q={}">{}</a></li>'.format(self.page_parm, i, self.search_data, i)
page_str_list.append(ele)
# 下一页
if self.page < self.total_page_count:
next = '<li><a href="?{}={}&q={}">下一页</a></li>'.format(self.page_parm, self.page + 1, self.search_data)
else:
next = '<li><a href="?{}={}&q={}">下一页</a></li>'.format(self.page_parm, self.total_page_count,
self.search_data)
page_str_list.append(next)
# 尾页
last_page = '<li><a href="?{}={}&q={}">尾页</a></li>'.format(self.page_parm, self.total_page_count,
self.search_data)
page_str_list.append(last_page)
search_string = """
<div style="width: 150px;margin-bottom: 20px;display: inline-block">
<form method="get">
<div class="input-group">
<input type="text" class="form-control" placeholder="请输入页码" name="{}">
<span class="input-group-btn">
<button class="btn btn-primary" type="submit">跳转</button>
</span>
</div>
</form>
</div>
""".format(self.page_parm)
page_str_list.append(search_string)
page_string = mark_safe("".join(page_str_list))
return page_string
(2) 导入Paginator类,传入参数如下所示
def phoneNum_list(request):
"""靓号列表"""
data_dict={}
search_data=request.GET.get("q","")
if search_data:
data_dict["phone_num__contains"]=search_data
# 分页
data = PrettyPhoneNum.objects.filter(**data_dict).order_by("level")
page_object=Paginator(request,data,search_data) # 其他三个参数根据需求调整
context={
"data": page_object.data,
"search_data": search_data,
"page_string": page_object.Html()
}
return render(request,"phonenum_list.html",context)
data为查询到的分页后的数据,search_data为收索的关键字,返回用于搜索框保留上次搜索的内容,page_string为分页按钮
(3) 在前端显示分页按钮
<nav aria-label="...">
<ul class="pagination">
{{ page_string }}
</ul>
</nav>
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