To use django forms is to use the django Form class and it's components on a view? How will this solve the issue? If i use the components, don't i have to re-render the page when a user makes an error on the form?
On Tuesday, October 31, 2017 at 7:50:38 PM UTC-3, James Schneider wrote: > > > > On Oct 30, 2017 4:46 PM, "fábio andrews rocha marques" < > [email protected] <javascript:>> wrote: > > Let's say i have a "register a new user" View and on this page, when the > user forgets to inform a password or a username, i show a message to him on > the same page saying "you forgot the password". The way i do this is by > doing this(on my View.py in a function called cadastrarprofessor): > > nomeusuario = request.POST['usuario'] #username > nomesenha = request.POST['senha'] #password > nomeemail = request.POST['email'] #email > > if not nomeusuario: > return render(request,'cadastro.html',{'cadastrorealizadocomsucesso': > False, 'error_message': "informe um usuário", > 'nomeemailcadastro':nomeemail, 'nomesenhacadastro':nomesenha}) > elif not nomesenha: > return render(request,'cadastro.html',{'cadastrorealizadocomsucesso': > False, 'error_message': "informe uma senha", 'nomeemailcadastro':nomeemail, > 'nomeusuariocadastro':nomeusuario}) > elif not nomeemail: > return render(request,'cadastro.html',{'cadastrorealizadocomsucesso': > False, 'error_message': "informe um email", 'nomesenhacadastro':nomesenha, > 'nomeusuariocadastro':nomeusuario}) > > And my template for this page(cadastro.html) is like this: > <meta charset="utf-8"/> > <h1>Cadastro</h1> > <form action="{% url 'cadastrarprofessor' %}" method="post"> > {% csrf_token %} > <label for="usuario">Usuário: </label> > {% if nomeusuariocadastro %} > <input id="usuario" type="text" name="usuario" value={{ > nomeusuariocadastro }}> > {% else %} > <input id="usuario" type="text" name="usuario" value=""/> > {% endif %} > > > ... (DO THE SAME TO SENHA/PASSWORD AND EMAIL) > > <input type="submit" value="Cadastrar"/> > </form> > <form action="{% url 'index' %}" method="post"> > <input type="submit" value="Voltar"/> > {% csrf_token %} > </form> > {% if cadastrorealizadocomsucesso is True %}<b>cadastro realizado com > sucesso!</b>{% endif %} > {% if error_message %}<p><strong>{{ error_message }}</p></strong>{% endif > %} > > So, every time the user forgets to mention a username or email or password > in this screen, i use render to redirect the user to the same page but this > time displaying a error_message. Let's say he did forget to fill the > textfield with a username... he goes back to the same page and sees the > error message. After that, let's say everything is right and he finally > registers a new user, he sees "cadastro realizado com sucesso"(sucessfully > registered new user) and stays on the same page. But when he goes back a > page(pressing "back" on the browser), instead of going back to the page > before the cadastro.html, he goes back to the same page cadastro.html but > displaying the error message for the "you forgot to mention your username". > I don't want him to go back to the same page with error message, i want to > make him go back to my main menu. > > > There is very little that you can do to prevent this type of behavior when > the user presses the back button. > > After the user successfully authenticates, they should be redirected to > the proper landing page by using an HTTP 302 redirect. This is very common > and baked in to all of the generic form handling views provided by Django. > If the page is redirected, then the user will encounter a warning pop up > from the browser asking if they want to resubmit the data. Generally this > is enough to scare users away from using the back button, but even if they > do continue through the warning, they'll simply reauthenticate and be > redirected to the same landing page, again. > > If that is not happening, them your form processing workflow is incorrect. > > From your view, you aren't using Django forms at all. I would highly > encourage you to do so, especially to better understand how form data > should be processed and validated, and how to properly handle responses > back to the client. The Django tutorial covers this topic. > > -James > -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/django-users. To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/9875e51c-ede8-4a9b-890a-75da0e8c0183%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
