jquery ajax not working?

i have a jquery ajax post that for some reasons doesn't work:

<script>
var callback = function(data) {
    if (data['order_id']) {
        $.ajax({
            type: 'POST',
            url: '<?php echo $_SERVER['PHP_SELF']; ?>',
            data: { myid: 123456 },
            success: function(data) {
                alert("Transaction Completed!");
            }
        });
    }}
</script>
<?php if ($_POST['myid']) { echo $_POST['myid']; } ?>

the 'callback' functions works fine(i test it), just that it stops at the ajax post and i cant see my echo's

any ideas on what i am doing wrong?

thanks

edit: i edited 开发者_Python百科the script a bit at the point where the ajax is posting successfully but i cant get the php to echo anything

If the AJAX - Call is succeeding now, you can't just echo anything with PHP. The data is sent to the client, but PHP is interpreted at the server. You're not sending an HTTP - Request anymore (which is pretty much the point of an AJAX-Call), so PHP is not going to do anything at this point.

You have to add your new content to the DOM with JavaScript. Try this and see if you get the message shown on your page. I append it to the body, because I don't know how your Markup and your returned data looks like:

     $.ajax({
                type: 'POST',
                url: '<?php echo $_SERVER['PHP_SELF']; ?>',
                data: { myid: 123456 },
                success: function(data) {
                    alert("Transaction Completed!");
                    $('body').prepend('<p>Successful AJAX - Call</p>');
                }
            });

Then you can take a look at your data-variable with console.log(data), access the returned data and modify the DOM via JavaScript.

ok, for a start.

writeback("Transaction Completed!";

fix it to:

writeback("Transaction Completed!");

1. you have a trailing comma after 123456

   data: { myid: 123456, },
   

2. you're missing a closing } to your callback function