Hi,

You can capture the layout select event and save the selected ids through javascript ,

<liferay-layout:select-layout
	itemSelectorSaveEvent='<%= liferayPortletResponse.getNamespace() + "selectLayout" %>'
	....	
/>
<aui:script>	
		Liferay.on('<portlet:namespace />selectLayout', function (event) {
			console.log(event.data)
		});
</aui:script>