"""分頁元件使用示例：
1) 先取出所有資料user_list
2) 例項化：
obj = pagination(request.get.get('page',1), len(user_list), request)
3) 對所有資料列表切片（即切出一頁資料）：
page_user_list = user_list[obj.start:obj.end]
4) 返回給頁面：
return render(request,'index.html',)
5) 模板頁面通過 } 渲染頁碼
"""
class
pagination(object):
#第一步 初始化頁面
def__init__(self,current_page_num,all_count,request,per_page_num=5,pager_count=11):
"""封裝分頁相關資料
:param current_page_num: 當前訪問頁的數字
:param all_count: 分頁資料中的資料總條數
:param per_page_num: 每頁顯示的資料條數
:param pager_count: 最多顯示的頁碼個數
"""try
: current_page_num =int(current_page_num)
except
exception as e:
current_page_num = 1
if current_page_num <1:
current_page_num = 1self.current_page_num =current_page_num
self.all_count =all_count
self.per_page_num =per_page_num
#第二步 實際總頁碼
all_pager, tmp =divmod(all_count, per_page_num)
iftmp:
all_pager += 1self.all_pager =all_pager
self.pager_count =pager_count
self.pager_count_half = int((pager_count - 1) / 2) #5#
儲存搜尋條件
import
copy
self.params=copy.deepcopy(request.get) #
@property
#屬性方法 在外部views裡 切片的時候不用加括號 直接呼叫 start就可以
defstart(self):
return (self.current_page_num - 1) *self.per_page_num
@property
defend(self):
return self.current_page_num *self.per_page_num
defpage_html(self):
#如果總頁碼 < 11個：
if self.all_pager <=self.pager_count:
pager_start = 1pager_end = self.all_pager + 1
#總頁碼 > 11
else
:
#當前頁如果<=頁面上最多顯示11/2個頁碼
if self.current_page_num <=self.pager_count_half:
pager_start = 1pager_end = self.pager_count + 1
#當前頁大於5
else
:
#頁碼翻到最後
if (self.current_page_num + self.pager_count_half) >self.all_pager:
pager_start = self.all_pager - self.pager_count + 1pager_end = self.all_pager + 1
else
: pager_start = self.current_page_num -self.pager_count_half
pager_end = self.current_page_num + self.pager_count_half + 1page_html_list =
first_page = '
首頁' % (1,)
if self.current_page_num <= 1:
prev_page = '
'else
: prev_page = '
' % (self.current_page_num - 1,)
#self.params=copy.deepcopy(request.get) #
#主要的for迴圈
for i in
range(pager_start, pager_end):
self.params[
"page
"]=i
if i ==self.current_page_num:
temp = '
%s' %(self.params.urlencode(),i)
else
: temp = '
%s' %(self.params.urlencode(),i,)
if self.current_page_num >=self.all_pager:
next_page = '
'else
: next_page = '
' % (self.current_page_num + 1,)
last_page = '
尾頁' %(self.all_pager,)
return
''.join(page_html_list)
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