"""
使用流程
分頁元件應用：
1. 在檢視函式中
queryset = models.issues.objects.filter(project_id=project_id)
page_object = pagination(
current_page=request.get.get('page'),
all_count=queryset.count(),
base_url=request.path_info,
query_params=request.get
)issues_object_list = queryset[page_object.start:page_object.end]
context =
return render(request, 'issues.html', context)
2. 前端
}"""
class pagination(object):
def __init__(self, current_page, all_count, base_url, query_params, per_page=30, pager_page_count=11):
"""分頁初始化
:param current_page: 當前頁碼
:param per_page: 每頁顯示資料條數
:param all_count: 資料庫中總條數
:param base_url: 基礎url
:param query_params: querydict物件，內部含所有當前url的原條件
:param pager_page_count: 頁面上最多顯示的頁碼數量
"""self.base_url = base_url
try:
self.current_page = int(current_page)
if self.current_page <= 0:
self.current_page = 1
except exception as e:
self.current_page = 1
query_params = query_params.copy()
query_params._mutable = true
self.query_params = query_params
self.per_page = per_page
self.all_count = all_count
self.pager_page_count = pager_page_count
pager_count, b = divmod(all_count, per_page)
if b != 0:
pager_count += 1
self.pager_count = pager_count
half_pager_page_count = int(pager_page_count / 2)
self.half_pager_page_count = half_pager_page_count
@property
def start(self):
"""資料獲取值起始索引
:return:
"""return (self.current_page - 1) * self.per_page
@property
def end(self):
"""資料獲取值結束索引
:return:
"""return self.current_page * self.per_page
def page_html(self):
"""生成html頁碼
:return:
"""if self.all_count == 0:
return ""
# 如果資料總頁碼pager_count<11 pager_page_count
if self.pager_count < self.pager_page_count:
pager_start = 1
pager_end = self.pager_count
else:
# 資料頁碼已經超過11
# 判斷： 如果當前頁 <= 5 half_pager_page_count
if self.current_page <= self.half_pager_page_count:
pager_start = 1
pager_end = self.pager_page_count
else:
# 如果： 當前頁+5 > 總頁碼
if (self.current_page + self.half_pager_page_count) > self.pager_count:
pager_end = self.pager_count
pager_start = self.pager_count - self.pager_page_count + 1
else:
pager_start = self.current_page - self.half_pager_page_count
pager_end = self.current_page + self.half_pager_page_count
page_list =
if self.current_page <= 1:
' else:
self.query_params['page'] = self.current_page - 1
' % (self.base_url, self.query_params.urlencode())
for i in range(pager_start, pager_end + 1):
self.query_params['page'] = i
if self.current_page == i:
tpl = '%s
' % (
self.base_url, self.query_params.urlencode(), i,)
else:
tpl = '%s
' % (self.base_url, self.query_params.urlencode(), i,)
if self.current_page >= self.pager_count:
' else:
self.query_params['page'] = self.current_page + 1
' % (self.base_url, self.query_params.urlencode(),)
if self.all_count:
tpl = "共%s條資料，頁碼%s/%s頁
" % (
self.all_count, self.current_page, self.pager_count,)
page_str = "".join(page_list)
return page_str
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