Django中的分页
Posted zhwang1216
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方法一：
views
1 def books(request): 2 # url取page参数书 3 page_num = request.GET.get(‘page‘) 4 print(page_num, type(page_num)) 5 # 总页码数 6 total_count = models.Book.objects.all().count() 7 # 每页显示多少条数据 8 per_page = 10 9 # 总共需要多少页码展示 10 total_page, m = divmod(total_count, per_page) 11 if m: 12 total_page += 1 13 14 try: 15 page_num = int(page_num) 16 if page_num > total_page: 17 page_num = total_page 18 except Exception as e: 19 # 页码不是数字,默认返回第一页 20 page_num = 1 21 22 # 定义两个变量保存数据从取到哪儿 23 data_start = (page_num - 1) * 10 24 data_end = page_num * 10 25 26 # 页面上最多展示多少个页码 27 max_page = 11 28 if total_page < max_page: 29 max_page = total_page 30 31 half_max_page = max_page // 2 32 # 页码上展示的页码从哪儿开始 33 page_start = page_num - half_max_page 34 # 页面展示到哪儿结束 35 page_end = page_num + half_max_page 36 # 如果当前页面减一半，比1还小 37 if page_start <= 1: 38 page_start = 1 39 page_end = max_page 40 # 如果当前页 加 一半 比总页码数还大 41 if page_end >= total_page: 42 page_end = total_page 43 page_start = total_page - max_page 44 45 all_book = models.Book.objects.all()[data_start:data_end] 46 # 自己拼接分页的代码 47 html_str_list = [] 48 # 加上第一页(首页) 49 html_str_list.append(‘<li><a href="/books/?page=1">首页</a></li>‘) 50 51 # 判断一下，如果是第一页，就没有上一页 52 if page_num <= 1: 53 html_str_list.append( 54 ‘<li class="disabled"><a href="#"> <span aria-hidden="true">«</span></a></li>‘.format( 55 page_num - 1)) 56 else: 57 html_str_list.append( 58 ‘<li><a href="/books/?page={}"> <span aria-hidden="true">«</span></a></li>‘.format(page_num - 1)) 59 60 for i in range(page_start, page_end + 1): 61 tmp = ‘<li> <a href="/books/?page={0}">{0}</a></li>‘.format(i) 62 html_str_list.append(tmp) 63 # 加一个下一页的标签(下一页) 64 # 判断是否是最后一页 65 if page_num >= total_page: 66 html_str_list.append( 67 ‘<li class="disabled" ><a href="#"> <span aria-hidden="true">»</span></a></li>‘) 68 else: 69 html_str_list.append( 70 ‘<li><a href="/books/?page={}"> <span aria-hidden="true">»</span></a></li>‘.format(page_num + 1)) 71 72 # 加上最后一页(尾页) 73 html_str_list.append(‘<li><a href="/books/?page={}">尾页</a></li>‘.format(total_page)) 74 75 page_html = "".join(html_str_list) 76 return render(request, "books.html", 77 {‘books‘: all_book, "page_html": page_html})
book.HTML
1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4 <meta charset="UTF-8"> 5 <title>书籍列表</title> 6 <link rel="stylesheet" href="/static/bootstrap/css/bootstrap.min.css"> 7 8 </head> 9 <body> 10 <div class="container"> 11 <table class="table table-bordered"> 12 <thead> 13 <tr> 14 <th>序号</th> 15 <th>ID</th> 16 <th>书名</th> 17 </tr> 18 </thead> 19 <tbody> 20 {% for book in books %} 21 <tr> 22 <td>{{ forloop.counter }}</td> 23 <td>{{ book.id }}</td> 24 <td>{{ book.title }}</td> 25 </tr> 26 {% endfor %} 27 </tbody> 28 </table> 29 <nav aria-label="Page navigation"> 30 <ul class="pagination"> 31 <li> 32 {{ page_html|safe }} 33 </li> 34 </ul> 35 </nav> 36 </div> 37 </body> 38 </html>
方法二：利用封装
创建文件utils文件
mypage
1 class Page(): 2 3 def __init__(self, page_num, total_count, url_prefix, per_page=10, max_page=11): 4 """ 5 6 :param page_num: 当前页码数 7 :param total_count: 数据总数 8 :param url_prefix: a标签href的前缀 9 :param per_page: 每页显示多少条数据 10 :param max_page: 页面上最多显示几个页码 11 """ 12 self.url_prefix = url_prefix 13 self.max_page = max_page 14 # 每一页显示多少条数据 15 # 总共需要多少页码来展示 16 total_page, m = divmod(total_count, per_page) 17 if m: 18 total_page += 1 19 self.total_page = total_page 20 21 try: 22 page_num = int(page_num) 23 # 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 24 if page_num > total_page: 25 page_num = total_page 26 except Exception as e: 27 # 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 28 page_num = 1 29 self.page_num = page_num 30 31 # 定义两个变量保存数据从哪儿取到哪儿 32 self.data_start = (page_num - 1) * 10 33 self.data_end = page_num * 10 34 35 # 页面上总共展示多少页码 36 if total_page < self.max_page: 37 self.max_page = total_page 38 39 half_max_page = self.max_page // 2 40 # 页面上展示的页码从哪儿开始 41 page_start = page_num - half_max_page 42 # 页面上展示的页码到哪儿结束 43 page_end = page_num + half_max_page 44 # 如果当前页减一半 比1还小 45 if page_start <= 1: 46 page_start = 1 47 page_end = self.max_page 48 # 如果 当前页 加 一半 比总页码数还大 49 if page_end >= total_page: 50 page_end = total_page 51 page_start = total_page - self.max_page + 1 52 self.page_start = page_start 53 self.page_end = page_end 54 55 @property 56 def start(self): 57 return self.data_start 58 59 @property 60 def end(self): 61 return self.data_end 62 63 64 def page_html(self): 65 # 自己拼接分页的HTML代码 66 html_str_list = [] 67 # 加上第一页 68 html_str_list.append(‘<li><a href="{}?page=1">首页</a></li>‘.format( self.url_prefix)) 69 70 # 判断一下 如果是第一页，就没有上一页 71 if self.page_num <= 1: 72 html_str_list.append(‘<li class="disabled"><a href="#"><span aria-hidden="true">«</span></a></li>‘.format(self.page_num-1)) 73 else: 74 # 加一个上一页的标签 75 html_str_list.append(‘<li><a href="{}?page={}"><span aria-hidden="true">«</span></a></li>‘.format( self.url_prefix, self.page_num-1)) 76 77 for i in range(self.page_start, self.page_end+1): 78 # 如果是当前页就加一个active样式类 79 if i == self.page_num: 80 tmp = ‘<li class="active"><a href="{0}?page={1}">{1}</a></li>‘.format(self.url_prefix, i) 81 else: 82 tmp = ‘<li><a href="{0}?page={1}">{1}</a></li>‘.format( self.url_prefix, i) 83 84 html_str_list.append(tmp) 85 86 # 加一个下一页的按钮 87 # 判断，如果是最后一页，就没有下一页 88 if self.page_num >= self.total_page: 89 html_str_list.append(‘<li class="disabled"><a href="#"><span aria-hidden="true">»</span></a></li>‘) 90 else: 91 html_str_list.append(‘<li><a href="{}?page={}"><span aria-hidden="true">»</span></a></li>‘.format( self.url_prefix, self.page_num+1)) 92 # 加最后一页 93 html_str_list.append(‘<li><a href="{}?page={}">尾页</a></li>‘.format( self.url_prefix, self.total_page)) 94 95 page_html = "".join(html_str_list) 96 return page_html
views
1 def depts(request): 2 page_num = request.GET.get(‘page‘) 3 print(page_num, type(page_num)) 4 # 总页码 5 total_count = models.Dept.objects.all().count() 6 from utils.mypage import Page 7 page_obj = Page(page_num, total_count, per_page=10, url_prefix="/depts/", max_page=11, ) 8 ret = models.Book.objects.all()[page_obj.start:page_obj.end] 9 print(ret) 10 page_html = page_obj.page_html() 11 return render(request,"dept.html",{‘dept‘:ret,‘page_html‘:page_html})
html代码
1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4 <meta charset="UTF-8"> 5 <title>部门列表</title> 6 <link rel="stylesheet" href="/static/bootstrap/css/bootstrap.min.css"> 7 </head> 8 <body> 9 10 <div class="container"> 11 <table class="table table-bordered"> 12 <thead> 13 <tr> 14 <th>序号</th> 15 <th>id</th> 16 <th>部门名</th> 17 </tr> 18 </thead> 19 <tbody> 20 {% for dept in depts %} 21 <tr> 22 <td>{{ forloop.counter }}</td> 23 <td>{{ dept.id }}</td> 24 <td>{{ dept.name }}</td> 25 </tr> 26 {% endfor %} 27 28 </tbody> 29 </table> 30 <nav aria-label="Page navigation"> 31 <ul class="pagination"> 32 {{ page_html|safe }} 33 </ul> 34 </nav> 35 </div> 36 </body>
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