目录

• Ajax结合sweetalert实现按钮动态效果
• bulk_create批量插入数据
  • 传统插入数据:
  • 使用djangoorm自带的bulk_create批量插入数据
• 低配版分页器推导
• 自定义分页器的使用

Ajax结合sweetalert实现按钮动态效果

​ 首先我们需要先到路由层做好对应的路由

from django.conf.urls import url
from django.contrib import admin
from day01 import views

urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'^$',views.home)
]

​ 然后在视图函数中返回对应的HTML页面

def home(request):
    user_queryset = models.User.objects.all()
    return render(request,'home.html',locals())

然后在models中将库建好

class User(models.Model):
    username = models.CharField(max_length=32)
    age = models.IntegerField()
    gender_choices = (
        (1, 'male'),
        (2, 'female'),
        (3, 'other'),
    )
    gender = models.IntegerField(choices=gender_choices)

然后将数据显示在HTML文件上
首先导入相关文件
将文件存在static文件中
然后在settings.py中写下STATICFILES_DIRS = [os.path.join(BASE_DIR,‘static’)]

<!--静态文件动态配置-->
{% load static %}
<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.js' %}"></script>
<script src="{% static 'jQuery/jQuery.js' %}"></script>

数据展示

<div class="container-fluid">
    <div class="row">
        <div class="col-md-8 col-md-offset-2">
            <h2 class="text-center">数据展示</h2>
            <br>
            <table class="table table-hover table-bordered table-striped">
                <thead>
                <tr>
                    <th>序号</th>
                    <th>用户名</th>
                    <th>年龄</th>
                    <th>性别</th>
                    <th class="text-center">操作</th>
                </tr>
                </thead>
                <tbody>
                {% for userObj in user_queryset %}
                    <tr>
                        <td>{{ forloop.counter }}</td>
                        <td>{{ userObj.username }}</td>
                        <td>{{ userObj.age }}</td>
                        <td>{{ userObj.get_gender_display }}</td>
                        <td class="text-center">
                            <a href="#" class="btn btn-success btn-sm">新增</a>
                            <a href="#" class="btn btn-danger btn-sm center user_id = {{ userObj.pk }}">删除</a>
                        </td>
                    </tr>
                {% endfor %}

                </tbody>

            </table>
        </div>
    </div>

添加点击事件(点击特效来自bootstrap)

<script>
    $('.center').click(function () {
        var $btn = $(this);
        swal({
                title: "你确认吗?",
                text: "这个文件将无法恢复!",
                type: "warning",
                showCancelButton: true,
                confirmButtonClass: "btn-danger",
                confirmButtonText: "给老子删了!",
                cancelButtonText: "别删,手滑了",
                closeOnConfirm: false,
                closeOnCancel: false
            },
            function (isConfirm) {
                if (isConfirm) {
                    //当点击确定时添加ajax请求
                    $.ajax({
                        url: '',
                        type: 'post',
                        data: {'delete_id': $btn.attr('user_id')},
                        success: function (data) {
                            if (data.code == 1000) {
                                swal('发生了未知的错误', '{{ data.msg }}', 'success');
                                $btn.parent().parent().remove()  // DOM操作删除按钮所在的tr
                            } else {
                                swal('有BUG', '发生了未知错误!', 'warning')
                            }
                        }
                    });

                    swal("删除成功!", "准备跑路吧!:)", "success");
                } else {
                    swal("返回", "数据安全了! :)", "error");
                }
            });
    })
</script>

后端处理Ajax请求

from django.http import JsonResponse  # 先导入模块传字典
def home(request):
    if request.is_ajax(): #判断请求是否为Ajax请求
        back_dic = {'code':1000,'msg':''}
        delete_id = request.POST.get('delete_id')
        models.User.objects.filter(pk=delete_id).delete()
        back_dic['msg']='数据已经被我删了'
        return JsonResponse(back_dic)

Ajax结合sweetalert参考代码即可 CV大法结合二次开发

bulk_create批量插入数据

传统插入数据:

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

直接给数据库干爆了

使用djangoorm自带的bulk_create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))
    models.Book.objects.bulk_create(book_list)
    
    book_queryset = models.Book.objects.all()
    return rander(request,'index.html',locals())

低配版分页器推导

queryset对象的切片操作

current_page = request.Get.get('page',1)
try:
current-page = int(current_page)    #转成int类型
except Exception as e:
    print(e)
per_page_num = 10  # 一次展示几条数据
start_page = (current_page - 1) * per_page_num  #起始页
end_page = current_page * per_page_num    #尾页
book_queryset = models.Book.objects.all()[start_page:end_page]

从bootcss拿到分页代码 并开发

{% for book in book_queryset %}
    <P>
        {{ book }}
</P>
{% endfor %}
<nav aria-label="Page navigation">
  <ul class="pagination">
    <li>
      <a href="#" aria-label="Previous">
        <span aria-hidden="true">&laquo;</span>
      </a>
    </li>
        {{ html|safe }}
    <li>
      <a href="#" aria-label="Next">
        <span aria-hidden="true">&raquo;</span>
      </a>
    </li>
  </ul>
</nav>

推导

book_queryset = models.Book.objects.all()
per_page_num = 10
all_count = book_queryset.count()
all_page_num,more = divmod(all_count,per_page_num)
if more:
    all_page_num += 1
    
html = ''
if current_page < 6:
    xxx = 6


for i in range(xxx-5,xxx+6):
    if current_page ==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)

自定义分页器的使用

拷自小袁添加到utils文件中的mypage.py

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)

需要掌握的使用方法:

后端

from app01.utils.mypage import Pagination
def index(request):
    current_page = request.GET.get('page',1)  # 你想要的分页展示的数据
    all_count = book_queryset.count()   # 获取当前页面
    page_obj = Pagination(current_page=current_page,all_count=all_count,per_page_num=10,pager_count=5)  # 生成一个分页器对象
page_queryset = book_queryset[page_obj.start:page_obj.end]

前端

{% for book in page_queryset %} 
    <P>
        {{ book }}
</P>
{% endfor %}
{{ page_obj.page_html|safe }}  # 自动渲染所有的页面及样式