如何在ajax发布后启用或触发提交事件

Question

How can I enable or trigger the submit event after ajax post?

For instance I have this form I don't want to submit it yet,

<form action="https://www.sandbox.paypal.com/cgi-bin/webscr" method="post">

<input type="hidden" name="item_name_1" value="Book 1" />

...

<input type="submit" name="pay" value="Check Out" />

</form>

until this page is called - session_end.php,

unset($_SESSION[SESSION_CART]);
unset($cart);

jquery,

$("input[name=pay]").click(function(){
    $("#form-paypal").submit(function(){

        $.post('re_post.php', {}, function() {

                        // I get eternal loop if I use either of these lines below,
            //$("#form-paypal").trigger('submit');
            //$("#form-paypal").submit();

        });


        return false;
    })
}); 

I will get the eternal loop on this page re_post.php but the form is not submitted.

Answer 1

You don't really need the $("input[name=pay]").click handler. A simple .submit() event handler registration should be sufficient.

As far as your infinite loop problem is concerned you could append .data() to the form to track status and avoid the infinite loop:

$(function() {
    $('#form-paypal').submit(function() {
        if (!$(this).data('valid')) {
            // we are entering here the first time we try to submit
            $.post('re_post.php', { }, function() {
                // we set the data so that when we trigger the submission we 
                // don't perform any more AJAX requests and avoid the infinite loop
                $('#form-paypal').data('valid', true).submit();
            });
            return false;
        }
        return true;
    });
});