ajax event onClick for grid fields

In a grid I created an ajax on click event for a field.

The event is fired if I use SC macros inside the event, e.g. sc_ajax_message() or sc_field_display().

But it seems that any standard javascript command does not work.
I tried a simple alert() and nothing happens.

What am I doing wrong?

Because this ajax onClick event expects PHP code, not JS, for this reason alert don’t works.

I don’t get it: shouldn’t the onClick event be processed by the browser, hence run a JS function?

Anyway, I’m trying to have an onClick event on a field that retrieve data from the server transparently and then show the output in another field (same grid\row).

I think I need to write an onclick event that does what this example does:
AJAX - Send a Request To a Server

I created a blank application that just php prints what I need to show in the grid so that the XMLHttpRequest can run it and get the output.
But where in the grid can I write the XMLHttpRequest code?

Gotcha!

http://www.scriptcase.net/forum/showthread.php?7844-How-send-Javascript-client-var-value-to-php-server-global-variable

In the onHeader as php echo.