I am trying to modify the Title component, as per my client requirement, i have to keep the Headline & introduction of title components is mandatory for few templates. and not mandatory info page & info page-wide components,
If your page component is different for each templates then you can find out pageResource in js and add validation on dialog submit
If your page component is same for mandatory and non-mandatory templates, the you can check template type using servlet and based on response add validation on dialog submit.
you can find page location in js using Granite.author.pageInfoHelper.json.status.path