How to do async validation in an onsubmit client script.

The GlideAjax (Asynchronous) does not work on onSubmit Client Script. This is because of the fundamental behavior of Asynchronous scripts which are non-blocking by nature.

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To mitigate this fundamental behavior, the form should be submitted again and this should be handled in the callback function of the getXML.

function onSubmit() {
if (g_scratchpad.isFormValid){
	return true;
}
var actionName = g_form.getActionName();
var ga = new GlideAjax("SOMEFUNCTION");
ga.addParam(.....);
ga.getXML(function() {
	g_scratchpad.isFormValid = true;
	g_form.submit(actionName);
});
	return false;
}