You are correct that you cannot use synchronous GlideAjax (getXMLWait()) in the Service Portal.
Use the below code:
function onSubmit() {
if (!g_form.ajaxComplete) {
ajaxCall();
return false;
}
}
function ajaxCall() {
var ga = new GlideAjax(script_include);
ga.addParam("sysparm_name", function_name);
ga.getXMLAnswer(function(a){
// Do whatever you want to with the answer
// Once you've handle the answer, run these two lines:
g_form.ajaxComplete = true;
g_form.submit();
});
}
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