How do I make a button inactive on radio button click?

I want to make a submit button inactive (not clickable) until one of form's radio buttons is checked.

This is what I have so far:

{% for answer in form.poll.answers.all %}
    <p class='field radio question'>
        <input id='{{ form.answer.auto_id }}_{{ answer.pk }}' type='radio' name='{{ form.answer.html_name }}' value='{{ answer.pk }}' />
        <label for='{{ form.answer.auto_id }}_{{ answer.pk }}'>
            <em>{{ answer }}</em>
        </label>
    </p>
{% endfor %}

<button class='buttons' type='submit' id='id_vote_button'>{% trans "Vote" %}</button>

<script src='{% static 'scripts/libs/jquery.js' %}'></script>

<script>
    $("input.radio").on('click', function () {
        console.log("click test");
        if ($('form.poll input.radio:checked')[0]) {
            console.log("true test");
            $("#id_vote_button").setAttribute('active', true);
        }
        else {
            console.log("false test");
            $("#id_vote_button").setAttribute('active', false);
        }
    });
</script>

The problem is the $("input.radio").on('click', function () does not cause any effect in console when I click on radio buttons.