ServiceNow "Try in Portal" button

Documentation & Article

https://snprotips.com/blog/2018/3/15/service-catalog-try-in-portal-button

Try in Portal UI Action

function openPortalPageList() {
	var itemID = g_form.getUniqueValue();

	var gwPortals = new GlideDialogWindow('try_item_portal_page');
	gwPortals.setTitle('Try Portal Page (select portal)');
	gwPortals.setPreference('portal_page_id', 'sc_cat_item');
	gwPortals.setPreference('item_id', itemID);
	gwPortals.render();
}

try_item_portal_page UI Page (Client script)

function goThere(suffix, id, item) {
	var url = new GlideURL('/' + suffix);
	url.addParam('id', id);
	url.addParam('sys_id', item);
	var w = getTopWindow();
	GlideDialogWindow.get().destroy();
	w.popupOpenFocus(url.getURL(), 'try_portal_page', 950, 700, '', false, false);
}

try_item_portal_page UI Page (HTML)

<j:set var="jvar_page_id" value="${RP.getWindowProperties().get('portal_page_id')}"/>
<j:set var="jvar_item_id" value="${RP.getWindowProperties().get('item_id')}"/>
<g:evaluate var="jvar_gr" object="true" jelly="true">
	// find existing portals
	var grPortal = new GlideRecord("sp_portal");
	grPortal.query();
	grPortal;
</g:evaluate>

<j:while test="${grPortal.next()}">
	<div style="padding:4px;" onclick="goThere('${grPortal.url_suffix}', '${jvar_page_id}', '${jvar_item_id}')">${grPortal.title} (/${grPortal.url_suffix})</div>
</j:while>