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01 forms组件补充1
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02 forms组件补充2
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03 ModelForm回顾
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04 浏览器的历史
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05 jsonop实现跨域请求
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06 jsonop实现跨域请求2
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07 jsonop实现跨域请求的应用
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08 基于cors实现跨域请求
01 forms组件补充1
1.1 jsonp跨域;
1.2 cors跨域;
1.3 admin配置;
1.4 会议室预定作业;
1.5 上节回顾
1.5.1 forms.ChoiceField(FIeld)
1.5.2 forms.ModelChoiceField(ChoiceField)
1.5.3 forms.ModelMultiField(ModelChoiceField)
1.6 Django的请求流程;
02 forms组件补充2
- 基于render的渲染;
- 基于自行编写模板的展示;
views.py;
from django.shortcuts import render
# Create your views here.
from django import forms
class BookForm(forms.Form):
title = forms.CharField()
price = forms.FloatField()
def addbook(request):
if request.method == "POST":
form = BookForm(request.POST)
if form.is_valid():
print(form.cleaned_data)
else:
print(form.errors)
form = BookForm()
return render(request, "addbook.html", locals())
addbook.html;
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
<h1>添加书籍</h1>
<form action="" method="post">
{% csrf_token %}
<p>名称<input type="text" name="title"></p>
<p>价格<input type="text" name="price"></p>
<input type="submit">
</form>
<br>
<hr>
<form action="" method="post">
{% csrf_token %}
{{ form.as_p }}
<input type="submit">
</form>
</body>
</html>
03 ModelForm回顾
3.1 基于ModelForm进行错误信息的判断;
views.py;
from django.shortcuts import render, redirect
# Create your views here.
from .models import *
from django import forms
from django.forms import widgets
from django.forms import ModelForm
from django.forms import widgets as wid
'''
class BookForm(forms.Form):
title = forms.CharField(max_length=32, label="书籍名称")
price = forms.DecimalField(max_digits=8, decimal_places=2, label="价格") # 999999.99
date = forms.DateField(label="日期",
widget=widgets.TextInput(attrs={"type": "date"})
)
# gender = forms.ChoiceField(choices=((1, "男"), (2, "女"), (3, "其他"),))
# publish = forms.ChoiceField(choices=Publish.objects.all().values_list("pk", "name"))
publish = forms.ModelChoiceField(queryset=Publish.objects.all())
authors = forms.ModelMultipleChoiceField(queryset=Author.objects.all())
'''
class BookForm(ModelForm):
class Meta:
model = Book
fields = "__all__"
# fields = ["title", "price"]
labels = {
"title": "书籍名称",
"price": "价格",
"date": "书籍日期",
"publish": "出版社",
"authors": "作者",
}
widgets = {
"title": wid.TextInput(attrs={"class": "form-control"}),
"price": wid.TextInput(attrs={"class": "form-control"}),
"date": wid.TextInput(attrs={"class": "form-control", "type": "date"}),
"publish": wid.Select(attrs={"class": "form-control"}),
"authors": wid.SelectMultiple(attrs={"class": "form-control"}),
}
error_messages = {
"title": {"required": "不能为空"},
"price": {"required": "不能为空"},
"date": {"required": "不能为空"},
"publish": {"required": "不能为空"},
"authors": {"required": "不能为空"},
}
def books(request):
book_list = Book.objects.all()
return render(request, "books.html", locals())
def add_book(request):
if request.method == "POST":
form = BookForm(request.POST)
if form.is_valid():
form.save() # 等价于,form.model.objects.create(request.POST)
return redirect("/books/")
else:
return render(request, "add.html", locals())
form = BookForm()
return render(request, "add.html", locals())
def edit_book(request, edit_book_id):
edit_book = Book.objects.filter(pk=edit_book_id).first()
if request.method == "POST":
form = BookForm(request.POST, instance=edit_book)
form.save() # edit_book.update(xxx===xxx)
return redirect("/books/")
form = BookForm(instance=edit_book)
return render(request, "edit.html", locals())
04 浏览器的历史
4.1 什么叫做域?什么叫做跨域?
4.2 同源策略;
同源策略(Same origin policy)是一种约定,它是浏览器最核心也最基本的安全功能,如果缺少了同源策略,则浏览器的正常功能可能都会受到影响。可以说Web是构建在同源策略基础之上的,浏览器只是针对同源策略的一种实现。
同源策略,它是由Netscape提出的一个著名的安全策略。现在所有支持JavaScript 的浏览器都会使用这个策略。所谓同源是指,域名,协议,端口相同。当一个浏览器的两个tab页中分别打开来 百度和谷歌的页面当浏览器的百度tab页执行一个脚本的时候会检查这个脚本是属于哪个页面的,即检查是否同源,只有和百度同源的脚本才会被执行。如果非同源,那么在请求数据时,浏览器会在控制台中报一个异常,提示拒绝访问。
4.3 IE浏览器兼容性不好,比较好的浏览器Chrome、FireFox、Safari;
4.4 qishiye单位,不思进取,使用IE6,人家只要能用即可,社会的毒瘤,国家的诟病;
4.5 JavaScript与Java没有半毛钱关系,只是名称相似;
4.6 ECMA,规定了浏览器的标准;
05 jsonop实现跨域请求
5.1 比如tab标签网页之间不能进行通信;
5.2 同源,即相同的服务器发送请求;即协议+域名+端口相同;
06 jsonop实现跨域请求2
07 jsonop实现跨域请求的应用
08 基于cors实现跨域请求