ajax上传文件:
<h2>基于ajax上传文件</h2>
<p>名字 <input type="text" id="filename"></p>
<p>文件 <input type="file" id="file"></p>
<button id="filebtn">上传文件</button>
$('#filebtn').click(function () {
//js取到文件
var myfile=$('#file')[0].files[0]
//生成一个FormData对象
var formdata=new FormData
//放值 //放文件
formdata.append('name',$('#filename').val())
formdata.append('myfile',myfile)
$.ajax({
url:'/fileupload/',
type:'post',
//这两个要必须写
processData:false, //不预处理数据 因为FormData 已经做了
contentType:false, //我不指定编码了 因为FormData 已经做了
data:formdata,
success:function (data) {
console.log(data)
alert(data)
}
})
})
# ajax文件上传
def fileupload(request):
if request.method == 'GET':
return render(request, 'fileupload.html')
if request.is_ajax():
name = request.POST.get('name')
# 文件对象
myfile = request.FILES.get('myfile')
import os
path = os.path.join('media', name)
with open(path, 'wb') as f:
for line in myfile:
f.write(line)
return HttpResponse('success')
django自带序列化:
# ajax page,了解,django自带的序列化
def page(request):
if request.method == 'GET':
users = UserInfo.objects.all()
# json序列
# user_dic = [{'name': user.name, 'age': user.age, 'id': user.id} for user in users]
# return JsonResponse(user_dic, safe=False, json_dumps_params={'ensure_ascii': False})
# 显示结果[{"name": "abc1", "age": 11, "id": 1}, {"name": "ewe", "age": 12, "id": 2}]
# 了解,django自带的序列化
user_dic = serializers.serialize('json', users)
return HttpResponse(user_dic)
# 显示结果[{"model": "app01.userinfo", "pk": 1, "fields": {"name": "abc1", "age": 11}}, {"model": "app01.userinfo", "pk": 2, "fields": {"name": "ewe", "age": 12}}]
批量插入数据bulk_create
# 批量插入数据bulk_create
def pagemass(request):
# # objes:对象列表,batch_size 一次插入数据的量
li = []
for i in range(200):
# UserInfo.objects.create() #老大方式
li.append(UserInfo(name='abc%s' % i, age=i + 1))
ret = UserInfo.objects.bulk_create(li, 20)
return HttpResponse('ok')
分页器组件:
# 分页器
from django.core.paginator import Paginator
def paging(request):
users = UserInfo.objects.all().order_by('pk')
paginator = Paginator(users, 20)
try:
currentpage = int(request.GET.get('page', 1)) # 默认显示第一页
page = paginator.page(currentpage)
except Exception as e:
# 出错时显示第一页
currentpage = 1
page = paginator.page(currentpage)
# 传入页码数,拿到的就是当前页对象
page = paginator.page(currentpage)
# 1 总页数是否大于11,当总页码数大于11
if paginator.num_pages > 11:
# 1.1 当前页码数是否小于6
if currentpage <= 6:
# 1.1.1 当当前页码小于6的时候,就生成11个页码数
page_range = range(1, 12)
# 1.2 当当前页码+5 大于等于总页码数
elif currentpage + 5 >= paginator.num_pages:
# 1.2.1 往后推11个页码数
page_range = range(paginator.num_pages - 10, paginator.num_pages + 1)
# 1.3 生成一个左5 右5的区间
else:
page_range = range(currentpage - 5, currentpage + 6)
# 2 总页码数不大于11 ,有多少,显示多少
else:
page_range = paginator.page_range
return render(request, 'page.html', locals())
<table class="table">
<thead>
<tr>
<th>id</th>
<th>name</th>
<th>age</th>
</tr>
</thead>
<br>
<tbody>
{# 循环的时page不是users#}
{% for user in page %}
<tr>
<td>{{ forloop.counter }}</td>
<td>{{ user.name }}</td>
<td>{{ user.age }}</td>
</tr>
{% endfor %}
</tbody>
</table>
<nav aria-label="Page navigation">
<ul class="pagination">
{# 上一页判断#}
{% if page.has_previous %}
<li>
<a href="/paging/?page={{ page.previous_page_number }}" aria-label="Previous">
<span aria-hidden="true">上一页</span>
</a>
</li>
{% else %}
<li class="disabled">
<a href="" aria-label="Previous">
<span aria-hidden="true">上一页</span>
</a>
</li>
{% endif %}
{# 判断当前页面是否是循环到的页码,如果是,加active#}
{% for foo in page_range %}
{% if currentpage == foo %}
<li class="acitve"><a href="/paging/?page={{ foo }}">{{ foo }}</a></li>
{% else %}
<li><a href="/paging/?page={{ foo }}">{{ foo }}</a></li>
{% endif %}
{% endfor %}
{# 下一页判断#}
{% if page.has_next %}
<li>
<a href="/paging/?page={{ page.next_page_number }}" aria-label="Next">
<span aria-hidden="true">下一页</span>
</a>
</li>
{% else %}
<li class="disabled">
<a href="" aria-label="Next">
<span aria-hidden="true">下一页</span>
</a>
</li>
{% endif %}
</ul>
</nav>
forms组件:(数据校验功能)
<form action="">
<p>name <input type="text" name="name"></p>
<p>pwd <input type="password" name="pwd"></p>
<p>email <input type="email" name="email"></p>
<input type="submit">
</form>
<h1>forms的模板渲染之一(推荐)</h1>
<form action="" method="post" novalidate>
<p>name: {{ myform.name }}</p>
<p>pwd: {{ myform.pwd }}</p>
<p>email: {{ myform.email }}</p>
<input type="submit">
</form>
<h1>forms的模板渲染之二(推荐!!!!!)</h1>
<form action="" method="post" novalidate>
{% for item in myform %}
<p>{{ item.label }}:{{ item }}</p>
{% endfor %}
<input type="submit">
</form>
<h1>forms的模板渲染之三</h1>
<form action="" method="post" novalidate>
{{ myform.as_p }}
<input type="submit">
</form>
from django import forms
# 继承Form这个类
class MyForm(forms.Form):
# 限制name这个字段最长为8,最短为3
name=forms.CharField(min_length=3,max_length=8,label='用户名',required=True,error_messages={'min_length':'至少为3','max_length':'最长为8,您太长了'})
pwd=forms.CharField(min_length=3,max_length=8,label='密码',error_messages={'min_length':'至少为3','max_length':'最长为8,您太长了'})
email=forms.EmailField(label='邮箱',error_messages={'invalid':'邮箱格式不合法','required':'这个字段必填'})
# ajax register
def register(request):
if request.method == 'GET':
myform=MyForm()
return render(request, 'register.html',locals())
else:
# 生成对象,传参,传字典,要校验数据的字典
# myform=MyForm(request.POST)
# 自己写要校验的字典,数据多了,多的是不校验的,但是cleaned_data中也没有多出来的数据
# dic={'name':'lqz','pwd':'123','email':'22@qq.com','xx':'xxx'}
# dic={'name':'lqz','pwd':'123','email':'22'}
# dic = {'name': 'abc', 'pwd': '122', 'email': '5555'}
name=request.POST.get('name')
pwd=request.POST.get('pwd')
email=request.POST.get('email')
dic = {'name': name, 'pwd': pwd, 'email': email}
print(dic)
myform = MyForm(dic)
# 所有字典都校验通过,它就是True的
if myform.is_valid():
# 取出校验通过的数据
clean_data=myform.changed_data
print(clean_data)
# models.UserInfo.objects.create(**clean_data)
else:
# 所有的错误信息
# 只要是校验通过的值,都在cleaned_data中放着
print(myform.changed_data)
print(myform.errors.as_data())
# 字典类型
print(type(myform.errors))
print(myform.errors.get('name'))
from django.forms.utils import ErrorDict
return HttpResponse('OK')
ajax总结:
1 默认编码urlencode,后端按照原来form表单提交的形式取值就可以了()
2 上传文件,form-data编码,后端按照原来form表单提交的形式取值就可以了,取数据从POST中取,取文件从FILES中取
3 上传json格式,django不会处理数据,需要自己处理,自己从body体中取出数据处理
TTL:
