[Answer]-Do I need a form to POST data?

You might just perform a normal asynchronous post as you’d do with Javascript or jQuery for a certain URL with your data.

For doing so with javascript, just create a XMLHttpRequest with whatever you have and send it.
With jQuery is even simpler.

jQuery:

$.post('/your_url' {
    your_item: value
    other_item: value2,

},
success: function(data) {
    alert(data);
});

edit:
The answer is no. Just handle the result in a view anyway.