django分頁器和優化
django 自帶分頁器的使用
if request.method == 'get':
return render(request, 'all_crawl/show_all.html', )
# 每10頁進行分頁
# paginator 分頁器的例項化
else:
print('11111111', paginator)
page_num = request.get.get('page', 1) # 獲取get請求的內容，預設為1 獲取url的頁面引數(get請求)
print('222222222222', page_num)
page_of_blogs = paginator.get_page(page_num) # 將獲取的第幾頁的文章列表值給賦值,get方法會自動處理異常
print('33333333333', page_of_blogs)
current_page_num = page_of_blogs.number # 獲取當前頁碼
print('44444444', current_page_num)
# 頁面範圍 顯示 分頁時的 結果， 就是如果有多個分頁，不完全顯示，就顯示4個頁面
# 獲取當前頁碼和 當前頁碼的前後兩頁
page_range = list(range(max(current_page_num - 2, 1), current_page_num)) + \
list(range(current_page_num, min(current_page_num + 2, paginator.num_pages) + 1))
print('555555555', page_range)
# 加上省略頁碼
if page_range[0] - 1 >= 2:
page_range.insert(0, '...')
if paginator.num_pages - page_range[-1] >= 2:
# 加上首頁和尾頁
if page_range[0] != 1:
page_range.insert(0, 1)
if page_range[-1] != paginator.num_pages:
print('6666666', page_range)
return render(request, 'all_crawl/show_all.html',
context=)
# 封裝分頁
class page(object):
def __init__(self, page_num, total_count, url_prefix, per_page=10, max_page=11):
""":param page_num: 當前頁碼數
:param total_count: 資料總數
:param url_prefix: a標籤href的字首
:param per_page: 每頁顯示多少條資料
:param max_page: 頁面上最多顯示幾個頁碼
"""self.url_prefix = url_prefix
self.max_page = max_page
# 總共需要多少頁碼來展示
total_page, m = divmod(total_count, per_page)
if m:
total_page += 1
self.total_page = total_page
try:
# 將取出的page轉換為int型別
page_num = int(page_num)
except exception as e:
# 當輸入的頁碼不是正經數字的時候 預設返回第一頁的資料
page_num = 1
# 如果輸入的頁碼數超過了最大的頁碼數，預設返回最後一頁
if page_num > total_page:
page_num = total_page
self.page_num = page_num
# 定義兩個變數儲存資料從哪兒取到哪兒
self.data_start = (page_num - 1) * 10
self.data_end = page_num * 10
# 頁面上總共展示多少頁碼
if total_page < self.max_page:
self.max_page = total_page
half_max_page = self.max_page // 2
# 頁面上展示的頁碼從哪兒開始
page_start = page_num - half_max_page
# self.page_start = page_start
# 頁面上展示的頁碼到哪兒結束
page_end = page_num + half_max_page
# self.page_end = page_end
# 如果當前頁減一半 比1還小, 不然頁面上會顯示負數的頁碼
if page_start <= 1:
page_start = 1
page_end = self.max_page
# 如果 當前頁 加 一半 比總頁碼數還大， 不然頁面上會顯示比總頁碼還大的多餘頁碼
if page_end >= total_page:
page_end = total_page
page_start = total_page - self.max_page + 1
self.page_start = page_start
self.page_end = page_end
@property
def start(self):
return self.data_start
@property
def end(self):
return self.data_end
def page_html(self):
# 自己拼接分頁的html**
html_str_list =
# # 加上首頁
'.format(self.url_prefix))
if self.page_num <= 1:
') else:
'«'.format(self.url_prefix,
self.page_num - 1))
for i in range(self.page_start, self.page_end + 1):
# 如果是當前頁就加乙個active樣式類
if i == self.page_num:
tmp = '
'.format(self.url_prefix, i)
else:
tmp = '
'.format(self.url_prefix, i)
if self.page_num >= self.total_page:
') else:
'»'.format(self.url_prefix,
self.page_num + 1))
# 加上尾頁
'.format(self.url_prefix, self.total_page))
page_html = "".join(html_str_list)
return page_html
#呼叫方式 傳入相應的引數
def c_fenye(request):
page_num = request.get.get("page")
# 呼叫封裝的page類，傳入相應的引數
page_obj = page(page_num, total_count, url_prefix="", per_page=10, max_page=11)
page_html = page_obj.page_html()
return render(request, 'ceshifenye.html', )
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