如何在Django中使用消息？

Question

Below, I have this div that is responsible to show any error , warning and success message. But I figure out how to use it with the success case only.

This is my views.py

def registration(request):
    form = PersonForm(request.POST or None)

    if form.is_valid():
        save_it = form.save(commit=False)
        save_it.save()
        messages.success(request, 'Your form was saved') 

     <if checkbox not checked>  <<< is this possible ?
       messages.error(request, 'You must accept the terms to register')

    return render(request, 'provisioning/registration.html', {'form':form,})

And this is my registration.py

    <div>
        ...
        {% if messages %}
            {% for message in messages %}
            <div {% if message.tags %} class="alert alert-{{ message.tags }}" {% endif %} alert-danger fade in">
                <button data-dismiss="alert" class="close close-sm" type="button">
                    <i class="fa fa-times"></i>
                </button>
                <strong>{{ message.tags }} | </strong> {{message}}
            </div>
            {% endfor %}
        {% endif %}
    </div>

My question is: how can I validate my fields and show if everything went fine or not in my html page ?

For example, there is a checkbox for the agreement of terms of use, right ? How can I use the messages to tell to the user that he need to accept the terms of use to register in case if wasn't checked by the user.

Answer 1

How about using clean method?

def clean_agreement(self):
        data = self.cleaned_data
        if not data['agreement']:
            msg = u"You have to agree with the terms and conditions."
            self._errors["agreement"] = self.error_class([msg])
            return False
        return True

Answer 2

Why you don't use JavaScript for show your messages ? its very elegant and have more performance ! you can use a function like this :

var showMessage = function(element, msg, where) {
    var div = $('<div class="your_classname"><h3>' +msg+ '</h3>(' +
    gettext('click to close') + ')</div>');
    div.click(function(event) {
        $(".your_class_name").fadeOut("fast", function() { $(this).remove(); });
    });

    var where = where || 'parent';

    if (where == 'parent'){
        element.parent().append(div);
    }
    else {
        element.after(div);
    }

    div.fadeIn("fast");
};

but about your question for validating forms read THIS good recipe ! also you can use THIS ONE from Django tutorial !