Django学习-14-分页功能实例

首先创建一个制作page的工具类

                    utils

                        --page_make.py

                                class Page():

                                    ...

class Page:
def __init__(self,request_page,all_count,path_info,every_page_count=10,every_page_num=7):
self.request_page = request_page #用户请求页号
self.all_count = all_count #展示列表总长度
self.path_info = path_info #请求页面URL
self.every_page_count = every_page_count #默认每页显示的列表长度
self.every_page_num = every_page_num #默认一页有几个跳转页
self.page_list = []
def start(self):
#返回展示列表的首索引
return (self.request_page-1)* self.every_page_count
def end(self):
# 返回展示列表的尾索引
return self.request_page * self.every_page_count
def total_count(self):
#返回列表分页显示后的总页数，长度为100的列表，每夜显示10行，可以分的页数总共为10页
count, y = divmod(self.all_count,self.every_page_count)
if y:
count += 1
return count

def index(self):
#返回当前请求页号在列表中的索引值范围
start_index = self.request_page - self.every_page_num // 2
end_index = self.request_page + self.every_page_num // 2 +1
count = self.total_count()
if count < self.every_page_num:
start_index = 1
end_index = count + 1
else:
if self.request_page <= (self.every_page_num // 2 + 1):
start_index = 1
end_index = self.every_page_num + 1
elif (self.request_page + self.every_page_num // 2) > count:
start_index = count - self.every_page_num + 1
end_index = count + 1
return start_index,end_index


def page_str(self):
#返回生成的HTML标签
start_index, end_index = self.index()
count = self.total_count()
first_page = "<a href='%s?pid=1'>首页</a>"%self.path_info
self.page_list.append(first_page)
if self.request_page == 1:
prev_page = "<a href='javascript:void(0);'>上一页</a>"
else:
prev_page = "<a href='%s?pid=%s'>上一页</a>" % (self.path_info,self.request_page - 1)
self.page_list.append(prev_page)
for i in range(start_index, end_index):
if i == self.request_page:
temp = "<a class='active' href='%s?pid=%s'>%s</a>" % (self.path_info,i, i)
else:
temp = "<a href='%s?pid=%s'>%s</a>" % (self.path_info,i, i)
self.page_list.append(temp)
if self.request_page == count:
next_page = "<a href='javascript:void(0);'>下一页</a>"
else:
next_page = "<a href='%s?pid=%s'>下一页</a>" % (self.path_info,self.request_page + 1)
self.page_list.append(next_page)
last_page = "<a href='%s?pid=%s'>尾页</a>" % (self.path_info,count)
self.page_list.append(last_page)
jump_page = """
<input id='jump_page' type='text' /><a onclick='jumpPage(this,"%s?pid=");'>跳转</a>
<script>
function jumpPage(ths,url){
var val = parseInt(ths.previousSibling.value);
if( val>0 && val<%s+1){
location.href = url + ths.previousSibling.value;
}
else{
ths.previousSibling.value = '';
return false;
}
}
</script>
""" % (self.path_info,count)
self.page_list.append(jump_page)
page_str = "".join(self.page_list)
page_str = mark_safe(page_str)
return page_str

from django.utils.safestring import mark_safe    将字符串标记为安全HTML代码

默认情况所有前端后台代码都是不安全的，想使用代码就标记安全，避免XSS

 

page_str = mark_safe(page_str)

return render(request,'page.html',{ 'list':list,'page_str':page_str })

HTML页面代码

<ol>
        {% for i in list %}
            <li>{{ i }}</li>
        {% endfor %}
</ol>
<div class="page">
        {{  page_str  }}
</div>