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Ajax运用与分页

2024-03-31 Web开发

django与ajax的分页处理 ajax + sweetAlert 实现再次确认:

下载插件 : https://github.com/lipis/bootstrap-sweetalert

二次确认的动态样式:

#样式: swal("删除成功!", "你可以准备跑路了!", "success"); #样式渲染 :基于bootstrap插件 缺陷: 创造者没有考虑中文,字体会被图标掩盖一部分,, 解决 : 调节字体的边距!! $("#b55").click(function () { swal({ title: "你确定要删除吗?", text: "删除可就找不回来了哦!", type: "warning", showCancelButton: true, // 是否显示取消按钮 confirmButtonClass: "btn-danger", // 确认按钮的样式类 confirmButtonText: "删除", // 确认按钮文本 cancelButtonText: "取消", // 取消按钮文本 closeOnConfirm: false, // 点击确认按钮不关闭弹框 showLoaderOnConfirm: true // 显示正在删除的动画效果 }, function () { var deleteId = 2; $.ajax({ url: "/delete_book/", type: "post", data: {"id": deleteId}, success: function (data) { if (data.code === 0) { swal("删除成功!", "你可以准备跑路了!", "success"); } else { swal("删除失败", "你可以再尝试一下!", "error") } } }) }); }) 批量数据插入 bulk_create : 批量数据插入 数据插入 : 缺陷 : 手动写操作日志存库,每次都需要访问一次数据库,性能较差 改进 : 先存到缓存文件(对象),特定条件触发/定时写入数据库, #样式 : add_record_list=[] f=utils.open_txt(cache_file_name) for line in f.readlines(): record_line = json.loads(line) #创建一个对象 obj =record( user_name=record_line['user_name'],#操作人 operate_old_record=record_line['old_content'],#具体操作的内容(旧) operate_now_record=record_line['new_content'],#具体操作的内容(新) ) add_record_list.append(obj) #批量写入数据 record.objects.bulk_create(add_record_list) record 对象 / 文件 add_record_list : 数据(对象) 分页: 分页思路推导: 提高了用户体验,还是减轻数据库读取数据的压力 # 分页器组件 class Pagination(object): def __init__(self,current_page,all_count,per_page_num=2,pager_count=11): """ 封装分页相关数据 :param current_page: 当前页 :param all_count: 数据库中的数据总条数 :param per_page_num: 每页显示的数据条数 :param pager_count: 最多显示的页码个数 用法: queryset = model.objects.all() page_obj = Pagination(current_page,all_count) page_data = queryset[page_obj.start:page_obj.end] 获取数据用page_data而不再使用原始的queryset 获取前端分页样式用page_obj.page_html """ try: current_page = int(current_page) except Exception as e: current_page = 1 if current_page <1: current_page = 1 self.current_page = current_page self.all_count = all_count self.per_page_num = per_page_num # 总页码 all_pager, tmp = divmod(all_count, per_page_num) if tmp: all_pager += 1 self.all_pager = all_pager self.pager_count = pager_count self.pager_count_half = int((pager_count - 1) / 2) @property def start(self): return (self.current_page - 1) * self.per_page_num @property def end(self): return self.current_page * self.per_page_num def page_html(self): # 如果总页码 < 11个: if self.all_pager <= self.pager_count: pager_start = 1 pager_end = self.all_pager + 1 # 总页码 > 11 else: # 当前页如果<=页面上最多显示11/2个页码 if self.current_page <= self.pager_count_half: pager_start = 1 pager_end = self.pager_count + 1 # 当前页大于5 else: # 页码翻到最后 if (self.current_page + self.pager_count_half) > self.all_pager: pager_end = self.all_pager + 1 pager_start = self.all_pager - self.pager_count + 1 else: pager_start = self.current_page - self.pager_count_half pager_end = self.current_page + self.pager_count_half + 1 page_html_list = [] # 添加前面的nav和ul标签 page_html_list.append(''' <nav aria-label='Page navigation>' <ul class='pagination'> ''') first_page = '<li><a href="?page=%s">首页</a></li>' % (1) page_html_list.append(first_page) if self.current_page <= 1: prev_page = '<li class="disabled"><a href="#">上一页</a></li>' else: prev_page = '<li><a href="?page=%s">上一页</a></li>' % (self.current_page - 1,) page_html_list.append(prev_page) for i in range(pager_start, pager_end): if i == self.current_page: temp = '<li class="active"><a href="?page=%s">%s</a></li>' % (i, i,) else: temp = '<li><a href="?page=%s">%s</a></li>' % (i, i,) page_html_list.append(temp) if self.current_page >= self.all_pager: next_page = '<li class="disabled"><a href="#">下一页</a></li>' else: next_page = '<li><a href="?page=%s">下一页</a></li>' % (self.current_page + 1,) page_html_list.append(next_page) last_page = '<li><a href="?page=%s">尾页</a></li>' % (self.all_pager,) page_html_list.append(last_page) # 尾部添加标签 page_html_list.append(''' </nav> </ul> ''') return ''.join(page_html_list) # views 视图 from app01.utils.mypage import Pagination def index(request): book_queryset = models.Book.objects.all() current_page = request.GET.get('page',1) all_count = book_queryset.count() page_obj = Pagination(current_page=current_page,all_count=all_count,per_page_num=10,pager_count=5) page_queryset = book_queryset[page_obj.start:page_obj.end] # book_queryset = book_queryset[start_page:end_page] return render(request,'index.html',locals()) #html 视图 #导入插件 : <link rel="stylesheet" href=http://www.mamicode.com/"{% static 'bootstrap-3.3.7-dist/css/bootstrap.min.css' %}"> <link rel="stylesheet" href=http://www.mamicode.com/"{% static 'dist/sweetalert.css' %}"> <script src=http://www.mamicode.com/"{% static 'bootstrap-3.3.7-dist/js/bootstrap.min.js' %}"></script> <script src=http://www.mamicode.com/"{% static 'dist/sweetalert.min.js' %}"></script> div class="container-fluid"> <div class="row"> <div class="col-md-8 col-md-offset-2"> {% for book in page_queryset %} <!--将页面上原本的queryset数据全部换成切片之后的queryset即可--> <p>{{ book }}</p> {% endfor %} {{ page_obj.page_html|safe }} <!---让前后端进行交互--->

Ajax运用与分页

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