CBV is called through the class method. We configure the following path in the URL:
url(r‘^cbv.html/‘, views.Cbv.as_view()),Function Format in viewsHere, CBV is a class. To use the CBV method, the path must be followed by an as_view (). This is a required fixed format.
To configure classes in views, You need to import a module
From Django. views. generic import view # This is the imported module. The original Django version is from Django. views can be directly imported into the view, but now you need to add a generic to the class CBV (View): # Here you must inherit the View class, only the as_view () that inherits the URL () this method def get (self, request): Return httpresponse ('cbv-get') def post (self, request): Return httpresponse ('cbv-post ')From Django. views. generic import viewclass CBV (View): def get (self, request): # Return httpresponse ('cbv-get') return render(request,'login.html ') sent to login.html def post (self, request ): return httpresponse ('cbv-post ')Page configuration code of login
<! Doctype HTML> <HTML lang = "en"> Browser access to view the results after clicking submit Click to submit
Here, by viewing the view source code, we can see that there are many submission methods.
http_method_names = [‘get‘, ‘post‘, ‘put‘, ‘patch‘, ‘delete‘, ‘head‘, ‘options‘, ‘trace‘]
These methods can be used when Ajax is used.
In addition, the inheritance class not only has a view, but also has a lot to do. You can view the source code.
My Django version is
C: \ Users \ Tony> python3-M Django -- version
1.9.13
CBV Matching Principle This more URL-based matching method is done through the reflection method (getattr. After the request comes, use the dispatch method. This method exists in the View class.
def dispatch(self, request, *args, **kwargs): # Try to dispatch to the right method; if a method doesn‘t exist, # defer to the error handler. Also defer to the error handler if the # request method isn‘t on the approved list. if request.method.lower() in self.http_method_names: handler = getattr(self, request.method.lower(), self.http_method_not_allowed) else: handler = self.http_method_not_allowed return handler(request, *args, **kwargs)
Customize dispatch If you need to Perform Batch operations on methods such as get and post, you can manually write a dispatch here, which is the same as that of the decorator. Because when requests come, they always go first by dispatch.
From Django. views. generic import viewclass CBV (View): def dispatch (self, request, * ARGs, ** kwargs): Print ('Operation before operation') OBJ = super (CBV, self ). dispatch (request, * ARGs, ** kwargs) print ('Operation code after the operation') return OBJ def get (self, request ): # Return httpresponse ('cbv-get') return render(request,'login.html ') def post (self, request): Return httpresponse ('cbv-post ')
When we access the service through a browser this time, we find that no matter whether the get or POST method is used, the print code is used,
Explanation of the CBV method of Django
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