user interface - HTML file in UiApp Google Apps Script -

i working on small google apps script , right stuck because made google picker in html file can't access in uiapp application.

i tried this...

var ebutton = app.createhtml(htmlservice.createtemplatefromfile('googlepicker.html').evaluate()); 

...but it's not working. there way build html within uiapp?

function doget() {   var app = uiapp.createapplication().settitle('blueturbo');    var ebutton = app.createhtml(htmlservice.createtemplatefromfile('googlepicker.html').evaluate());    // create grid 3 text boxes , corresponding labels   var grid = app.creategrid(3, 3);    // text entered in text box passed in id   grid.setwidget(0, 0, app.createlabel('folder id : '));   grid.setwidget(0, 1, app.createtextbox().setname('id'));   grid.setwidget(0, 2, ebutton);    // text entered in text box passed in name.   grid.setwidget(2, 0, app.createlabel('nom : '));   grid.setwidget(2, 1, app.createtextbox().setname('name'));    // text entered in text box passed in emails   grid.setwidget(1, 0, app.createlabel('emails : '));   grid.setwidget(1, 1, app.createtextbox().setname('emails'));    [...] //more code    return app; } 

you can't mix uiapp , html service in same script.

you can use drive showdocspicker() described here instead.

in doc can read :

using uiapp's html widget it's possible add custom html markup application. there restrictions on type of content can added widget however, , following set of html tags can used: b, blockquote, body, br, center, caption, cite, code, div, em, h1, h2, h3, h4, h5, h6, hr, i, label, legend, li, ol, p, span, strong, sub, sup, table, tbody, td, thead, title, tr, tt, ul take advantage of full set of html features, consider using html service build user interface instead of uiapp.