I am building a web app with Angular 2 framework and I want to use an external template (https://freehtml5.co/preview/?item=splash-free-html5-bootstrap-template-for-any-webs
Script tags are not allowed in component templates. Including scripts in your index.html should make them globally accessible. It isn't clear what you mean when you say you're browsing to another page, but if you use the angular router with router-outlet all scripts you import should be accessible.