On Oct 30, 2017 4:46 PM, "fábio andrews rocha marques" <
fabioandrewsrochamarq...@gmail.com> 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
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