1. What is a view?
View function, referred to as a view, Python is a simple function that accepts a response back to the Web and Web requests. The response may be a page's HTML content, a redirect, a 404 error, an XML document, or a picture... Anything is possible. No matter what the view itself contains logic, it must return a response. Write the code where it does not matter, as long as it is in your Python directory. In addition there is no more requirement - and you can say, "There's nothing magical place." In order to put the code somewhere, will view the agreement is placed in the project or application directory named views.py file.
As shown in FIG view function:
from django.shortcuts import render, HttpResponse, redirect # Create your views here. def index(request): import datetime now = datetime.datetime.now() ctime = now.strftime('%y-%m-%d,%X') return render(request, "index.html", {"ctime": ctime})
As shown, index function is a function of view, his argument must have a request, you must return an HttpResponse object. The function name of the view function does not need unity, we can only express the function function.
2, HttpRequest request object
Common methods:
request.method: output request mode
request.path: output path
request.POST:POST request data
request.GET: get the requested data
request.META: request header
request.get_full_path () to get the path parameter also takes
3, HttpResponse response object
There are three main forms of response object:
HttpResponse（）
render()
redirect()
HttpResponse is the string to add in parenthesis that require a response, said two other major here.
4、render()
Binding template and a given context dictionary, returns after a HttpResponse object rendering.
There are two functions: 1, read the file string
def index(request): return render(request, 'index.html'）
2, embedded variables
code as shown in views:
DEF index (Request): shangping_list = [ ' apple ' , ' banana ' , ' watermelon ' ] name = ' QQQ ' return the render (Request, " index.html " , { ' SP ' : shangping_list, ' name ' : name} )
That is followed by the dictionary with a
As shown in FIG template:
<body> 用户：{{ name }} <h2>商品信息</h2> <ul> {% for foo in sp %} <li>{{ foo }}</li> {% endfor %} </ul> </body>
This can be through a dictionary of key data will pass up on the page. And a method of extraction elements in the sequence loop.
Page is shown below:
User: qqq
product information
apple
banana
watermelon