Django + Ajax update listbox (Template)

{% extends "base.html" %}
{% block head %}
<script type="text/javascript" src="http://code.jquery.com/jquery-1.7.1.min.js"></script>
<script type="text/javascript">
    (function() {
    $.get("/", function(data) {
            alert(data);
        });
    });
    (function() {
    $.post("/", function(data) {
            alert(data);
        });
    });
    function MySelectSubmit() {
        document.myform.submit();
    }
</script>
{% endblock %}

{% block content %}
    <form method="POST" name='myform' action='.'>
        {% csrf_token %}
        <!--<input type="submit" value="Click Here">-->
        <br>
        <select name="tipo" onchange="MySelectSubmit()">
            <option value="">-- Selcione o tipo --</option>
            <option value="hostname">Hostname</option>
            <option value="designacao">Designação</option>
        </select>
        <select name="auto" id="auto" onchange="">
            {% for key, value in listbox.items %}
                <option value="{{ value }}">{{ key }}</option>
            {% endfor %}
        </select>
    </form>
<br>
{% endblock %}