ServiceNow Animated "Loading" field message during GlideAjax call

animated_msg_example_2.js

var gaSlowGlideAjaxCall = new GlideAjax('{some_glideajax_script_include');
//todo: Set the second argument to the method you want to execute from your GlideAjax Script Include
gaSlowGlideAjaxCall.addParam('sysparm_name', '{some_slow_glideajax_script_method');
//todo: Add whatever other GlideAjax parameters you need to add below, such as:
gaSlowGlideAjaxCall.addParam('record_sys_id', g_form.getUniqueValue());
gaSlowGlideAjaxCall.addParam('some_field_value', g_form.getValue('{field_name}'));

//Show animated form message: "Processing request..."
//This will continue to show and animate until we call stopAnimatedLoadingFieldMessage(),
// which we'll do in the callback function
//todo: Update message from "Processing request" to whatever is appropriate to your situation.
showAnimatedLoadingFieldMessage(
	'{field_name}', //todo: Replace with name of field on which to show message
	'Processing request', //todo: Replace with loading message text
	'info' //todo: Set message type (info/warning/error)
);

//The below callback function (which clears the animated form message) will only execute
// when the slow GlideAjax call is complete. Until then, the animated message will continue.
gaSlowGlideAjaxCall.getXMLAnswer(function (answer) {
	//todo: Do something with the answer here...
	//Clear the animated "Processing request" field message and add a new one.
	stopAnimatedLoadingFieldMessage(); //Clears the existing message after stopping the animation.
	//todo: Replace the below message with something appropriate to your situation.
	if (answer) { //todo: Update condition or behavior to suit your situation.
		g_form.showFieldMsg(
			'{field_name}', //todo: update
			'Processing complete!', //todo: update
			'info'
		);
	} else {
		g_form.showFieldMsg(
			'{field_name}', //todo: update
			'Unable to process request!', //todo: update
			'error'
		);
	}
});