分页
自定义分页
稳扎稳打版
def book(request): # 从URL取参数（访问的页码） page_num = request.GET.get("page") try: # 将取出的page转换为int类型 page_num = int(page_num) except Exception as e: # 当输入的页码不是正经数字的时候 默认返回第一页的数据 page_num = 1 # 数据库总数据是多少条 total_count = models.Book.objects.all().count() # 每一页显示多少条数据 per_page = 10 # 总共需要多少页码来展示 total_page, m = divmod(total_count, per_page) if m: total_page += 1 # 如果输入的页码数超过了最大的页码数，默认返回最后一页 if page_num > total_page: page_num = total_page # 定义两个变量从哪里开始到哪里结束 data_start = (page_num - 1) * 10 data_end = page_num * 10 # 页面上总共展示多少页码 max_page = 11 if total_page < max_page: max_page = total_page # 把从URL中获取的page_num 当做是显示页面的中间值， 那么展示的便是当前page_num 的前五页和后后五页 half_max_page = max_page // 2 # 根据展示的总页码算出页面上展示的页码从哪儿开始 page_start = page_num - half_max_page # 根据展示的总页码算出页面上展示的页码到哪儿结束 page_end = page_num + half_max_page # 如果当前页减一半 比1还小, 不然页面上会显示负数的页码 if page_start <= 1: page_start = 1 page_end = max_page # 如果 当前页 加 一半 比总页码数还大， 不然页面上会显示比总页码还大的多余页码 if page_end >= total_page: page_end = total_page page_start = total_page - max_page + 1 # 从数据库取值， 并按照起始数据到结束数据展示 all_book = models.Book.objects.all()[data_start:data_end] # 自己拼接分页的HTML代码 html_str_list = [] # # 加上首页 html_str_list.append('<li><a href="/book/?page=1">首页</a></li>') # 断一下 如果是第一页，就没有上一页 if page_num <= 1: html_str_list.append('<li class="disabled"><a href="#"><span aria-hidden="true">«</span></a></li>') else: # 不是第一页，就加一个上一页的标签 html_str_list.append('<li><a href="/book/?page={}"><span aria-hidden="true">«</span></a></li>'.format(page_num - 1)) for i in range(page_start, page_end + 1): # 如果是当前页就加一个active样式类 if i == page_num: tmp = '<li class="active"><a href="/book/?page={0}">{0}</a></li>'.format(i) else: tmp = '<li><a href="/book/?page={0}">{0}</a></li>'.format(i) html_str_list.append(tmp) # 判断，如果是最后一页，就没有下一页 if page_num >= total_page: html_str_list.append('<li class="disabled"><a href="#"><span aria-hidden="true">»</span></a></li>') else: # 不是最后一页， 就加一个下一页标签 html_str_list.append('<li><a href="/book/?page={}"><span aria-hidden="true">»</span></a></li>'.format(page_num + 1)) # 加上尾页 html_str_list.append('<li><a href="/book/?page={}">尾页</a></li>'.format(total_page)) page_html = "".join(html_str_list) return render(request, "book.html", {"all_book":all_book, "page_html":page_html})
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>书籍列表</title> <link rel="stylesheet" href="/static/bootstrap/css/bootstrap.min.css"> </head> <body> <div class="container"> <table class="table table-bordered"> <thead> <tr> <th>序列号</th> <th>ID值</th> <th>书名</th> <th>时间</th> </tr> {% for book in all_book %} <tr> <td>{{ forloop.counter }}</td> <td>{{ book.id }}</td> <td>{{ book.name }}</td> <td>{{ book.date }}</td> </tr> {% endfor %} </thead> </table> <nav aria-label="Page navigation"> <ul class="pagination"> {{ page_html|safe }} </ul> </nav> </div> </body> </html>
封装保存版
class Page(object): def __init__(self, page_num, total_count, url_prefix, per_page=10, max_page=11): """ :param page_num: 当前页码数 :param total_count: 数据总数 :param url_prefix: a标签href的前缀 :param per_page: 每页显示多少条数据 :param max_page: 页面上最多显示几个页码 """ self.url_prefix = url_prefix self.max_page = max_page # 总共需要多少页码来展示 total_page, m = divmod(total_count, per_page) if m: total_page += 1 self.total_page = total_page try: # 将取出的page转换为int类型 page_num = int(page_num) except Exception as e: # 当输入的页码不是正经数字的时候 默认返回第一页的数据 page_num = 1 # 如果输入的页码数超过了最大的页码数，默认返回最后一页 if page_num > total_page: page_num = total_page self.page_num = page_num # 定义两个变量保存数据从哪儿取到哪儿 self.data_start = (page_num - 1) * 10 self.data_end = page_num * 10 # 页面上总共展示多少页码 if total_page < self.max_page: self.max_page = total_page half_max_page = self.max_page // 2 # 页面上展示的页码从哪儿开始 page_start = page_num - half_max_page # 页面上展示的页码到哪儿结束 page_end = page_num + half_max_page # 如果当前页减一半 比1还小, 不然页面上会显示负数的页码 if page_start <= 1: page_start = 1 page_end = self.max_page # 如果 当前页 加 一半 比总页码数还大， 不然页面上会显示比总页码还大的多余页码 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): # 自己拼接分页的HTML代码 html_str_list = [] # # 加上首页 html_str_list.append('<li><a href="{}?page=1">首页</a></li>'.format(self.url_prefix)) # 断一下 如果是第一页，就没有上一页 if self.page_num <= 1: html_str_list.append('<li class="disabled"><a href="#"><span aria-hidden="true">«</span></a></li>') else: # 不是第一页，就加一个上一页的标签 html_str_list.append('<li><a href="{}?page={}"><span aria-hidden="true">«</span></a></li>'.format(self.url_prefix, self.page_num - 1)) for i in range(self.page_start, self.page_end + 1): # 如果是当前页就加一个active样式类 if i == self.page_num: tmp = '<li class="active"><a href="{0}?page={1}">{1}</a></li>'.format(self.url_prefix, i) else: tmp = '<li><a href="{0}?page={1}">{1}</a></li>'.format(self.url_prefix, i) html_str_list.append(tmp) # 判断，如果是最后一页，就没有下一页 if self.page_num >= self.total_page: html_str_list.append('<li class="disabled"><a href="#"><span aria-hidden="true">»</span></a></li>') else: # 不是最后一页， 就加一个下一页标签 html_str_list.append('<li><a href="{}?page={}"><span aria-hidden="true">»</span></a></li>'.format(self.url_prefix, self.page_num + 1)) # 加上尾页 html_str_list.append('<li><a href="{}?page={}">尾页</a></li>'.format(self.url_prefix, self.total_page)) page_html = "".join(html_str_list) return page_html
def publisher(request): page_num = request.GET.get("page") total_count = models.Publisher.objects.all().count() # 调用封装的Page类，传入相应的参数 page_obj = Page(page_num, total_count, url_prefix="/publisher/", per_page=10, max_page=11) all_publisher = models.Publisher.objects.all()[page_obj.start:page_obj.end] page_html = page_obj.page_html() return render(request, "publisher.html", {"publisher": all_publisher, "page_html": page_html})
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>图书列表</title> <link rel="stylesheet" href="/static/bootstrap/css/bootstrap.min.css"> </head> <body> <div class="container"> <table class="table table-bordered"> <thead> <tr> <td>序列号</td> <td>ID值</td> <td>出版社</td> <td>时间</td> </tr> </thead> <tbody> {% for pub in publisher %} <tr> <th>{{ forloop.counter }}</th> <th>{{ pub.id }}</th> <th>{{ pub.name }}</th> <th>{{ pub.date }}</th> </tr> {% endfor %} </tbody> </table> <nav aria-label="Page navigation"> <ul class="pagination"> {{ page_html|safe }} </ul> </nav> </div> </body> </html>
效果图如下：
