The login prefix will end with a forward slash. This login prefix should be followed by the page suffix for the page that should be displayed after login. For example, if the external URL prefix of the resource is http://www.ensemble.com/app/ and the desired page after login is http://www.ensemble.com/app/pages/mainpage.html, then the full login link would be made by adding pages/mainpage.html to the login link prefix.

<pt:ensemble.loginlink pt:level="4" pt:key="loginurlprefix"/>
var loginLink = "<pt:logic.value pt:value="$loginurlprefix"/>" + "pages/mainpage.html";