How to set an event handler in a Django form input field

How to set a JavaScript function as handler in the event onclick in a given field of a Django Form. Is this possible?

Any clue would be appreciated.

What is form Is_valid () in Django?

The is_valid() method is used to perform validation for each field of the form, it is defined in Django Form class. It returns True if data is valid and place all data into a cleaned_data attribute.

What is form AS_P in Django?

Django forms are an advanced set of HTML forms that can be created using python and support all features of HTML forms in a pythonic way.

What I do for that is :

class MyForm(forms.Form):
    stuff = forms.ChoiceField(
        [('a','A'),('b','B')],
        widget = forms.Select(attrs = {
            'onclick' : "alert('foo !');",
            }
        )