Get the Query String from Page Configuration 'Advanced' option.

Set default query string without sending it in friendly URL. Can be useful in display templates.


 

You can configure the site page with above shown string and fetch it using below code :

ServiceContextThreadLocal.getServiceContext().getRequest().getParameter("srce")

or

ParamUtil.get(ServiceContextThreadLocal.getServiceContext().getRequest(), "srce", "")

You can also fetch this in velocity template :

#set ($serviceContext = $portal.getClass().forName("com.liferay.portal.service.ServiceContextThreadLocal").getServiceContext())

#set ($httpServletRequest = $serviceContext.getRequest())

#set($seminarId =$paramUtil.getLong($httpServletRequest, 'srce'))