Django checkbox do not return nothing

Question

I mading a project and i need to get checkbox values in sequence, but django do not return anything when that checkbox are unchecked. how can i do that return False instead of nothing?

forms.py

class myFormExemple(forms.Form):
    checkbox = forms.BooleanField(required=False)

views.py

def MyViewExemple(request):
    if request.method == 'POST':
        print(request.POST.getlist('checkbox'))
    context = {
        'form': myFormExemple
    }
    return render(request, "cadastro/myHTMLTemplate.html", context)

and myHTMLTemplate.html:

<form method="post" id='form'>
    {% csrf_token %}
    {{form.checkbox}}          
    <button type="submit">save</button>
</form>

Answer 1

If the checkbox is not checked, the POST request will indeed not contain the name of that checkbox, that is how the HTML form works.

You can however validate and clean the data with your form, and transform this into a boolean with:

def MyViewExemple(request):
    if request.method == 'POST':
        form = myFormExemple(request.POST)
        if form.is_valid():
            print(form.cleaned_data['checkbox'])
    context = {
        'form': myFormExemple()
    }
    return render(request, "cadastro/myHTMLTemplate.html", context)

We thus construct a form with request.POST as data source, and then if the form is valid, we can obtain a boolean with form.cleaned_data['checkbox'].

Django's forms are thus not only used to render a form, but also to process data of a form, validate that data, and convert the data to another type.