gistfile1.js

$('form#new_task').submit(function() {  
    $.ajax({
        type: "POST",
        url: $(this).attr('action'), //sumbits it to the given url of the form
        data: {
                data_1: value_1,
                data_2: value_2
        }, //input gui di
        dataType: "HTML", 
        success(function(result){
        // result la gia tri tra ve tu controller
       //do something
       });
    });
    return false; // dung cho muc dich ko chuyen trang
})