django----Sweetalert bulk_create批量插入数据 自定义分页器

目录

• 一.Sweetalert使用AJAX操作
• 二.bulk_create
• 三.分页器
  • divmod
  • 分页器组件
  • 自定义分页器的使用

一.Sweetalert使用AJAX操作

​ sweetalert下载地址 Sweetalert

$("#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")
                            }
                        }
                    })
                });
    		})

​ 页面刷新复习 location.reload

// 利用Dom操作
$(this).parent().parent().remove()
// function里的this 和 之前的this不一样 所以我们需要 之前就定义好this
$btn = $(this)

二.bulk_create

def index(request):
    for i in range(1000):
        models.Book.objects.create(title='%s'%i)
    book_queryset = models.Book.objects.all()
   	return render('xxx.html',locals())

​ 使用bulk_create 来批量插入数据

def index(request):
    book_list = []
    for i in range(10000):
        book_list.append(models.Book(title='第%s本书'%i))
    # 批量插入数据 建议orm建议你使用bulk_create
    models.Book.objects.bulk_create(book_list)
    book_queryset = models.Book.objects.all()
    return render('xxx.html', locals())

两者差距很大

三.分页器

divmod

>>> divmod(100,10)
(10, 0)
>>> divmod(101,10)
(10, 1)
>>> divmod(99,10)
(9, 9)

分页器组件

​ 通常 我们使用到外部的功能 都会放入 文件名为 utils

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)

自定义分页器的使用

 # 一页展示多少条
    per_page_num = 10
    # 用户想看的页码 但是拿到的字符串我们强转 默认为1
    current_page_str = request.GET.get('page',1)
    current_page_num = int(current_page_str)
    """
    per_page_num = 10
    current_page        start_page          end_page
        1                   0                   10
        2                   10                  20
        3                   20                  30
    """

    # 开始条数
    start_page = (current_page_num - 1) * per_page_num
    end_page = current_page_num * per_page_num

    # 一共分多少页展示给用户看
    book_count_num = models.AuthDetail.objects.count()
    all_count, more = divmod(book_count_num, per_page_num)
    if more:
        all_count += 1

    # 可以切分渲染给前端页面了
    book_queryset = models.AuthDetail.objects.all()

    xxx = current_page_num
    # 判断他是否是前6页
    if current_page_num < 6:
        xxx = 6

    if current_page_num > all_count - 5:
        xxx = all_count - 5

    # for循环自造数据给前端
    html = ''
    for i in range(xxx-5, xxx+6):
        # 判断如果循环的时候 current_page_num == i 说明当前页
        if current_page_num == i:
            html += '<li class="active"><a href="?page=%s">%s</a></li>'%(i,i)

        else:
            html += '<li><a href="?page=%s">%s</a></li>' % (i, i)

    # 安全返回
    from django.utils.safestring import mark_safe
    html = mark_safe(html)

    book_queryset = book_queryset[start_page:end_page]
    return render(request, 'test.html', locals())

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)
# 需要将原来的 book_queryset 替换成 page_queryset
page_queryset = book_queryset[page_obj.start:page_obj.end]  
# book_queryset = book_queryset[start_page:end_page]
return render(request,'index.html',locals())  # 第二种

最后 渲染分页器 <p>{{ page_ojb.page_html|safe }}</p>