I can’t get the value form using a method=”post...

the easiest way is to use AJAX and JSON . For example, in your “view” file, where you have your form:

<form id="foo" action="your_script.php" ...>
    <input type="text" name="bar" />
    ...
</form>

The jQuery / Ajax part (to put also in the view file):

$('#foo').submit(function(){
    var dataForm = $(this).serialize();
    var urlForm = $(this).attr('action');

    $.ajax({
        type: 'POST',
        url: urlForm,
        data: dataForm,
        dataType: 'json',
        success: function(msg) {
            if (msg.success)
                alert(msg.text);
            else
                alert("Something's wrong!");
        }
    });

    return false; // for not reload the page
});

Finally, you just have to complete your PHP script by something like that:

// For example, get a POST var:
$bar = $_POST['bar'];

// Do everything else (eg. add data to BDD, send email, etc...)

// Display the answer
$message = array(
    'text'         => 'Ok! Everything is allright!',
    'success'      => TRUE
);

echo json_encode($message);
exit;