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Ajax运用与分页

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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="{% static 'bootstrap-3.3.7-dist/css/bootstrap.min.css' %}">
    <link rel="stylesheet" href="{% static 'dist/sweetalert.css' %}">
    <script src="{% static 'bootstrap-3.3.7-dist/js/bootstrap.min.js' %}"></script>
    <script src="{% 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

标签:pre   close   标签   turn   contain   exce   ==   cancel   property   

原文地址:https://www.cnblogs.com/shaozheng/p/11973718.html

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