(see examples in “script tests”)

• this example shows how to add content from an html interface. In the example they add rows based on input fields in html
• read google sheet to get dropdown options andand here is the code
• there's a good book on this and here is thecode for the book
  

make layouts here

it appears (?) you need https to load external files?

before </head>: <link rel=“stylesheet” href=“https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css”>

before </body>:

• <script src=“https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js”></script>
• <script src=“https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/js/bootstrap.min.js”></script>
  

</body>

reference: http://stackoverflow.com/questions/27863416/can-bootstrap-js-be-used-in-gas-google-apps-script