Django

Posted 2020-11-24 samoo

目录

• Django(八)---sweetalert和分页器
  • sweetalert
  • 分页器

Django(八)---sweetalert和分页器

sweetalert

1. 导入sweetalert的js和css文件

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

2. 通过var $btn = $(this);获取到当前a标签所在的对象

3. 使用sweetalert渲染删除弹出框

   swal({
     title: "Are you sure?",
     text: "You will not be able to recover this imaginary file!",
     type: "warning",
     showCancelButton: true,
     confirmButtonClass: "btn-danger",
     confirmButtonText: "Yes, delete it!",
     cancelButtonText: "No, cancel plx!",
     closeOnConfirm: false,
     closeOnCancel: false
   },
   function(isConfirm) {
     if (isConfirm) {
       swal("Deleted!", "Your imaginary file has been deleted.", "success");
     } else {
       swal("Cancelled", "Your imaginary file is safe :)", "error");
     }
   });

4. 在function(isConfirm)函数中,进行删除操作

   if (isConfirm) {
       // 朝后端发送ajax请求
       $.ajax({
           url:'',
           type:'post',
           data:{'delete_id':$btn.attr('userId')},
           success:function (data) {
               if(data.code==1000){
                   swal("删除成功!", "数据已清除", "success");
                   // 通过DOM操作 来直接操作标签  不用重新刷新页面
                   $btn.parent().parent().remove()
               }else{
                   swal("未知错误!", "数据未删除", "error");
               }
           }
       });
   } else {
       swal("已取消!", "你的数据很安全 :)", "error");
   }

5. 后端通过url对应的方法,对删除数据进行数据库的操作

   import time
   def del_book(request):
       if request.is_ajax():
           back_dic = {'code':1000,'msg':''}
           book_id = request.POST.get('book_id')
           time.sleep(2)
   
           models.Book.objects.filter(pk=book_id).delete()
           back_dic['msg'] = '数据已经删除!'
           return JsonResponse(back_dic)
       _url = reverse('show_book')
       return redirect(_url)

分页器

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)