Django-自定義分頁
阿新 • • 發佈：2018-07-27
isa 變量 range 代碼 imp lencod django mat 多少 封裝好的自定義分頁器
class Page(): def __init__(self, page_num, total_count, base_url, params, per_page=10, max_page=11): """ page_num: 當前頁碼數 total_count: 數據總數 base_url: a標簽href的前綴 params: request對象，是QueryDict類型 per_page: 每頁顯示多少條數據 max_page: 單一頁面上最多顯示幾個頁碼 """ self.page_num = page_num self.total_count = total_count self.base_url = base_url self.params = params self.per_page = per_page self.max_page = max_page # 總頁碼 total_page, m = divmod(self.total_count, self.per_page) if m: total_page += 1 self.total_page = total_page try: self.page_num = int(self.page_num) # 如果輸入的頁碼數大於最大的頁碼數，默認返回第一頁 if self.page_num > self.total_page: self.page_num = self.total_page elif self.page_num <= 0: self.page_num = 1 except Exception as e: # 當輸入的頁碼不是數字時，返回第一頁 self.page_num = 1 # 定義兩個變量保存數據從哪取到哪 self.data_start = (self.page_num - 1) * 10 self.data_end = self.page_num * 10 #頁面上總共展示多少頁碼 #如果總頁數小於設定的單頁顯示頁碼數 if self.total_page < self.max_page: self.max_page = self.total_page # 讓選定頁碼取中，計算左右兩邊長度 self.half_max_page = self.max_page // 2 # 頁面上展示的頁碼從哪開始 self.page_start = self.page_num - self.half_max_page # 頁面上展示的頁碼從哪結束 self.page_end = self.page_num + self.half_max_page # 如果開始頁數小於1 if self.page_start <= 1: self.page_start = 1 self.page_end = self.max_page # 如果結束頁面大於最大頁碼數 elif self.page_end >= self.total_page: self.page_start = self.total_page - self.max_page + 1 self.page_end = self.total_page #拷貝一份request對象，是個QueryDict形式，後面會用於獲取及修改url import copy self.params = copy.deepcopy(self.params) #{"page":"12","title_startwith":"py","id_gt":"5"} @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代碼 html_str_list = [] # 加上上一頁標簽 #判斷一下如果是第一頁就沒有上一頁了 if self.page_num <= 1: html_str_list.append(‘<li class="disabled"><a href="#"><span aria-hidden="true">?</span></a></li>‘) #否則加上上一頁 else: self.params["page"] = self.page_num - 1 html_str_list.append(‘<li><a href="{0}?{1}"><span aria-hidden="true">?</span></a></li>‘.format(self.base_url ,self.params.urlencode())) # 加上首頁 self.params["page"] = 1 html_str_list.append(‘<li><a href="{0}?{1}">首頁</a></li>‘.format(self.base_url, self.params.urlencode())) for i in range(self.page_start, self.page_end + 1): #把QueryDict中的page修改為當前循環的頁碼 self.params["page"] = i # 如果i等於當前頁就加一個樣式類 if i == self.page_num: tmp = ‘<li class="active"><a href="{0}?page={1}">{2}</a></li>‘.format(self.base_url, self.params.urlencode(), i) else: tmp = ‘<li><a href="{0}?{1}">{2}</a></li>‘.format(self.base_url, self.params.urlencode(), i) html_str_list.append(tmp) # 加上尾頁 self.params["page"] = self.total_page html_str_list.append(‘<li><a href="{0}?{1}">尾頁</a></li>‘.format(self.base_url, self.params.urlencode())) # 加上下一頁標簽 #判斷，如果是最後一頁，就沒有下一頁 if self.page_num >= self.total_page: html_str_list.append(‘<li class="disabled"><a href="#"><span aria-hidden="true">?</span></a></li>‘) else: self.params["page"] = self.page_num + 1 html_str_list.append(‘<li><a href="{0}?{1}"><span aria-hidden="true">?</span></a></li>‘.format(self.base_url, self.params.urlencode())) page_html = "".join(html_str_list) return page_html
使用指南
def books(request): #從url取當前頁數 page_num = request.GET.get("page", 1) #總數據量 total_count = models.Book.objects.all().count() #獲取當前訪問url base_url = request.path #引入分頁器並實例化一個對象 from utils.mypage import Page page_obj = Page(page_num, total_count, base_url, request.GET, per_page=10, max_page=9) ret = models.Book.objects.all()[page_obj.start:page_obj.end] page_html = page_obj.page_html() return render(request, "books.html", {"books": ret, "page_html": page_html})
Django-自定義分頁