I have a DrExplain help facility (css, js, htm files) that I want to use in a SharePoint 2013 custom web part via a popup window. This works well in .NET applications but not in SharePoint. The DrExplain folder is in a SharePoint SiteAssets folder.
When accessed by .NET applications, the DrExplain is in a server folder. That might work in SharePoint but I'm limited to SPA pages (html, css, JavaScript, no code-behind). Any ideas?
What I have tried:
Google a lot. Put the DrExplain in ControlTemplates but have not found how to reference it.