How to link to another html page using javascript in Google Apps Script?

Question

I have a Google Script project and I am trying to link through javascript to another HTML page that is included in the project. My code is the following:

function doGet(e) {
  if (e.parameters.page=="page2") 
      return HtmlService.createHtmlOutputFromFile("page2");
  else
      return HtmlService.createHtmlOutputFromFile("page1");
}

This is the command I'm now trying to open the other page with:

window.location.assign(window.location.href+"?page=page2");