Prevent multiple submissions with jquery

You can keep your code exactly as it is in the question, just by changing the click event on the #btn-true button to avoid multiple requests using the . one of jQuery. This method causes the event to be run only 1 time when a btn-delete[] button is clicked.

Just change from:

$('#btn-true').click(function () {

To:

$('#btn-true').one("click", function () {

This is more advantageous because it avoids having to create global variables as the first response reported.

Your code is badly strutted You're setting every time your body or see a click it will add an EventListener to your $ button ("# btn-true") ie if you execute action 3 times it will add 3 events on the same button and so on.

You have two options to work around this problem, the first is simply to change the trigger of the button by inserting only the <button id="btn-true" click="NomeDafuncao()"> or changing your code up by something like this.

<script>
var codigo = null;
var action = null;

$('document').ready(function(){
    $('body').on('click', 'button[name="btn-delete[]"]', function (e) {
            e.preventDefault();
            action = $(this).data("function");
            var nameType = $(this).data("name");
            codigo = $(this).val();
            var Name = $('.user-name-' + codigo).html();
            var element = $(this).parent().parent().parent();

            $('.header-modal-box h4').text('Deletar');
            $('.row-f label').text('Deseja remover o ' + nameType + ' ' + Name + '?');

            Modal();
    });
    $('#btn-true').click(function () {
        if ($('.trigger_notify').length) {
            $('.trigger_notify').remove();
        }
        $.ajax({
            url: '_models/Data.php?action=' + action,
            method: 'POST',
            data: {codigo: codigo},
            dataType: 'json',
            success: function (data) {
                if (data.erro === true) {
                    trigger(data.notify);
                    element.remove();
                } else {
                    trigger(data.notify);
                }
            }
        });
    });
});