javascript alert - after submit in django - django

Question

I have an html form in my website it's using django, and I want show massage "javascript alert()" after submit successfully
this is the form:
<form action="{% url guestbook-post %}" method="POST">{% csrf_token %}
{% for field in form %}
{% if field.is_hidden %}
{{ field }}
{% else %}
<p
{% if field.errors %} class="error"{% endif %}
{% ifequal field.name "honeypot" %} style="display:none;"{% endifequal %}>
{% if field.errors %}{{ field.errors }}{% endif %}
{{ field.label_tag }} {{ field }}
</p>
{% endif %}
{% endfor %}
<p class="submit">
<input type="submit" name="submit" class="submit-post" value="Post" />
<input type="submit" name="submit" class="submit-preview" value="Preview" />
</p>
</form>

Answer 1

Use jQuery with a submit handler:
$('#myForm').submit( function () { alert('Form Submitted'); });
Not sure how Django handles posts, so you may need to do some further routing within the jQuery call...

Answer 2

You could add a javascript function to the submit handler of the form and have an alert in this function. Something like:
<form action="{% url guestbook-post %}" method="POST" onsubmit="return validate()">
<script>
function validate()
{
// do some validation here to decide whether the post is going to be successful or not.
if (valid)
{
alert("Going to post your data now!");
return true;
}
else
{
return false; // form won't post
}
}
</script>