Create and delete form fields

Question

Colleagues.

I have a system developed this time with PHP of which I register in BD the number of participants of a given event. With these amounts, I create the form fields. See:

    <?php
    ....
    while($jm = mysqli_fetch_object($sqlCampos)){
    ?>

    <input type="text" name="NomePessoas[]" class="form-control" maxlenght="100">

    <?php } // Fim do while($jm = mysqli_fetch_object($sqlCampos)) 
?>

So far all right, but I need to make the user delete or add fields and when adding/deleting, change in BD the amount registered.

How I would do this in Ajax/Jquery?

Thank you!