本文基于類實現(xiàn)分頁功能，以下是詳細代碼：
class Page:
page_num = 0
total_count = 0
tartype = "" # 查詢路徑，默認為當前頁
total_page = 0 # 總頁數(shù)
per_page = 8 # 每頁顯示8篇文章
max_page = 11 # 每頁最大展示頁數(shù)選項
half_page = max_page // 2
searchParam = ""
# 標記該鏈接所屬分類ID，首頁默認為空
def __init__(self, page_num=1, total_count=0, per_page=8, max_page=11, tartype="", searchParam=""):
"""
初始化函數(shù)：接收頁碼數(shù)、總數(shù)據(jù)數(shù)，計算總頁碼數(shù)并過濾錯誤頁碼數(shù)據(jù)
:param page_num: 當前頁碼數(shù)
:param total_count: 總數(shù)據(jù)數(shù)
:param tartype: 分類值
:param searchParam: 查詢信息
"""
self.page_num = page_num
self.total_count = total_count
self.tartype = tartype
self.per_page = per_page
self.max_page = 11
self.total_page, m = divmod(self.total_count, self.per_page) # 總頁碼數(shù)，余數(shù)為m
if searchParam:
self.searchParam = searchParam
if m:
self.total_page += 1 # 余數(shù) 0 ， 加1
if self.total_page < self.max_page:
self.max_page = self.total_page
self.half_page = self.max_page // 2
# 過濾錯誤get數(shù)據(jù)
if self.page_num > self.total_page:
self.page_num = self.total_page
elif self.page_num < 1:
self.page_num = 1
def data_start(self):
return (self.page_num - 1) * self.per_page
def data_end(self):
return self.page_num * self.per_page
def page_html(self):
# 計算頁數(shù)選項
page_start = self.page_num - self.half_page
page_end = self.page_num + self.half_page
if page_start <= 1:
page_start = 1
page_end = self.max_page
if page_end >= self.total_page:
page_end = self.total_page
page_start = self.total_page - self.max_page + 1
# 計算上一頁下一頁選項
if self.page_num == 1:
last_page = self.page_num
next_page = self.page_num + 1
else:
if self.page_num == self.total_page:
last_page = self.page_num - 1
next_page = self.page_num
else:
last_page = self.page_num - 1
next_page = self.page_num + 1
print(self.searchParam)
html_str_list = []
html_str_list.append('<li><a href="{}?page={}{}" >?</a></li>'.format(self.tartype, last_page, self.searchParam))
for i in range(page_start, page_end + 1):
if i == self.page_num:
tmp = '<li><a class="active" href="{}?page={}{}" >{}</a></li>'.format(self.tartype, i, self.searchParam,
i)
html_str_list.append(tmp)
continue
tmp = '<li><a href="{}?page={}{}" >{}</a></li>'.format(self.tartype, i, self.searchParam, i)
html_str_list.append(tmp)
html_str_list.append(
'<li><a href="{}?page={}{}" >?</a></li>'.format(self.tartype, next_page, self.searchParam))
page_html = "".join(html_str_list)
return page_html通過修改per_page、max_page控制每頁展示的文章數(shù)和分頁模塊展示的最大頁碼數(shù)。
實現(xiàn)思路：創(chuàng)建page類對象，傳入參數(shù)為page_num（當前頁碼數(shù)）、total_count（總文章數(shù)）、tartype（分類值）、category（所屬分類ID）【注：tartpe用于區(qū)分index頁還是category頁，category為查詢的分類ID，index頁時值為空?？梢愿鶕?jù)自己要實現(xiàn)的功能進行修改】構造函數(shù)會計算出總頁碼數(shù)并過濾掉錯誤數(shù)據(jù)。需要實現(xiàn)某功能是直接調用類方法即可。
類方法：data_start（）計算出當前頁的文章的起始索引值
data_end（）計算出當前頁的文章的結束索引值
page_html（）返回分頁模塊的html代碼，可直接render到前端。
調用方法：
pages_str = Page(page_num = currentPage, total_count= total,per_page= pageSize,searchParam=search_parm).page_html()
