标签：formdata form 告诉 function control art except sda bre
MTV模型(django):
M:模型层(models.py)
T:templates
V:views
MVC模型:
M:模型层(models.py)
V:视图层views.py
C:控制器(Controller) urls.py
本质:django的MTV也是MVC
class Book(models.Model): name = models.CharField(max_length=32) authors = models.ManyToManyField(to=‘Author‘) class Author(models.Model): name = models.CharField(max_length=32)
class Book(models.Model): name = models.CharField(max_length=32) class Author(models.Model): name = models.CharField(max_length=32) class Book2Author(models.Model): book = models.ForeignKey(to=‘Book‘) author = models.ForeignKey(to=‘Author‘) info = models.CharField(max_length=32)
class Book(models.Model): name = models.CharField(max_length=32) authors = models.ManyToManyField( to=‘Author‘,through=‘Book2Author‘,through_fields=(‘book‘,‘author‘)) class Author(models.Model): name = models.CharField(max_length=32) # book = models.ManyToManyField( # to=‘Book‘,through=‘Book2Author‘,through_fields=(‘author‘,‘book‘)) class Book2Author(models.Model): book = models.ForeignKey(to=‘Book‘) author = models.ForeignKey(to=‘Author‘) info = models.CharField(max_length=32)
对应的数据格式:name=jason&password=666
后端获取数据:request.POST
django会将urlencoded编码的数据解析自动放到request.POST
form表单传输文件的编码格式
后端获取文件格式数据:request.FILES
后端获取普通键值对数据:request.POST
ajax发送json格式数据
注意：编码与数据格式要一致
AJAX = Asynchronous JavaScript and XML(异步的 JavaScript 和 XML)
AJAX 不是新的编程语言，而是一种使用现有标准的新方法。
AJAX 最大的优点是在不重新加载整个页面的情况下，可以与服务器交换数据并更新部分网页内容。
<script> //ajax传输json格式数据 $(‘#d1‘).click(function () { $.ajax({ url:‘‘, // url参数可以不写，默认就是当前页面打开的地址 type:‘post‘, contentType:‘application/json‘, //数据与编码要对应 data:JSON.stringify({‘name‘:‘jason‘,‘hobby‘:‘study‘}), success:function (data) {} }) }); </script>
<script> $(‘#d1‘).click(function () { let formdata = new FormData(); // FormData对象不仅仅可以传文件还可以传普通的键值对 formdata.append(‘name‘,‘jason‘); // 获取input框存放的文件 //$(‘#i1‘)[0].files[0] formdata.append(‘myfile‘,$(‘#i1‘)[0].files[0]); $.ajax({ url:‘‘, type:‘post‘, data:formdata, // ajax发送文件需要修改两个固定的参数 processData:false, // 告诉浏览器不要处理数据 contentType:false, // 不要用任何的编码，就用formdata自带的编码格式，django能够自动识别改formdata对象 // 回调函数 success:function (data) { alert(data) } }) }); </script>
form表单不支持异步提交局部刷新
form表单不支持传输json格式数据
form表单与ajax默认传输数据的编码格式都是urlencoded
l = [] for i in range(10000): l.append(models.Book2(name=‘第%s本书‘%i)) models.Book2.objects.bulk_create(l) # 批量插入数据
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)
#后端: def booklist（request）： book_list = models.Book2.objects.all() # 数据总条数 all_count = book_list.count() # 当前页 current_page = request.GET.get(‘page‘,1) # 示例一个分页器对象 page_obj = my_page.Pagination(current_page=current_page,all_count=all_count) # 对总数据进行切片 page_queryset = book_list[page_obj.start:page_obj.end] return render(request，‘booklist.html‘,locals())
前端
//前端 <div class="col-md-8 col-md-offset-2"> <table class="table table-hover table-bordered table-striped"> <thead> <tr> <th>id</th> <th>name</th> </tr> </thead> <tbody> {% for book in page_queryset %} <tr> <td>{{ book.pk }}</td> <td>{{ book.name }}</td> </tr> {% endfor %} </tbody> </table> {{ page_obj.page_html|safe }} //帮你渲染的是带有bootstrap样式的分页器 </div>
标签：formdata form 告诉 function control art except sda bre
原文地址：https://www.cnblogs.com/yuanlianghong/p/11025144.html
