Hi, creating a userevent script but I would like a popup based on specific conditions. Cannot make it a client script as they dont support n/https. any advise?

Be more specific. What condition? What kind of popup (alert,new window,toast notification)

You can play around with injecting HTML into a hidden field that’s added beforeLoad,

var objBanner = JSON.parse(stDisplayBanner);
						stInjectHtml = 'var myMessage = message.create({title: \'' + objBanner.title + '\', message: \'' + objBanner.message + '\', type: message.Type.' + objBanner.type + '});';
						stInjectHtml += 'myMessage.show({duration: ' + objBanner.duration + '});';
						objInjectionField.defaultValue = '<script>jQuery(function($) {require([\'N/ui/message\'], function(message){' + stInjectHtml + ';})})</script>';
						record.submitFields({
							type: 'customrecord_fa_asset',
							id: objAsset.id,
							values: {'custrecord_fa_ast_display_banner': ''},
							options: {enableSourcing: false, ignoreMandatoryFields: true}
						});

Serverside does not support popups because its serverside. The validation should be done prior to making a call or if not available, store the return values and do some kind of alert with that client side.

https is fully supported on the clientside... Promise also is. supported

Thanks, and Encode is also supported? Figured out HTTP error was s/t else.

N/encode isnt supported client side, but there are plenty of normal javascript libraries that will probably do what you want