I would create 2 functions, like
if (result == 'validation succeeded') {
someSuccessFunction();
return;
}
someFailFunction();
return;
}
On 3/31/07, tawm <[EMAIL PROTECTED]> wrote:
Hello people,
I'm in a situation right now in which I do an AJAX call, supplying it
a callback function (for success). In this callback function I do some
operations which determine what happens after the AJAX call. Normally
you would solve this by calling yet another callback function at the
end of the success-callback. But now this is not possible because the
function that did the original AJAX call is called from inside a
plugin and should return a certain value (true or false) to instruct
the plugin's consequent behaviour.
The plugin I'm talking about is the jQuery form plugin, so the
situation is as follows:
--- begin example code ---
// Activate the form plugin to enable AJAX submission of a form.
$("#aForm").ajaxForm({beforeSubmit: validateForm});
// validateForm is called before the form is actually submitted.
// It should return true if the form should be submitted after all
(f.e. because all data is valid),
// false in case it should stop (f.e. there is some invalid data in
the form).
function validateForm()
{
$.ajax({url: '/validateSomething.php', data: 'something', success:
function(result) {
// Here our validation call is done, so here we know whether we
want validateForm() to return
// true or false. Problem is: we are in a callback function and we
cannot reach the function
// from which we originate (validateForm). Any value that we
return here is simply lost in
// jQuery's $.ajax() function.
if (result == 'validation succeeded') {
return true; // This doesn't work because the return value is
dropped by $.ajax().
}
return false; // This doesn't work because the return value is
dropped by $.ajax().
});
return; // Here we want to return true or false, depending on the
behaviour that we expect from
// the form plugin after this callback finishes. Problem
is, here we don't know this value,
// since it is determined in $.ajax()'s success callback
function.
}
--- end example code ---
Since I'm not very experienced with asynchronous stuff in Javascript I
don't know whether this is a flaw in jQuery or an inevitable result of
the way AJAX works. In the latter case, I guess that the architecture
of the jQuery form plugin is flawed. Or I must be overlooking a
possibility to return a value based on the outcome of a AJAX call done
in the same function.
I hope all is a bit clear. Thanks in advance.
Tim Molendijk
