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Polymer elements not working after pub build – Did I forget something?

Asked By: Anonymous

so my Polymer.Dart project is running fine in Chromium (running on Dart code) but when I pub upgrade and pub build the sampler-scaffold keeps working but paper-button, paper-dialog, paper-progress… elements are just not showing up!

My HTML file looks like this

    <link href='|Open+Sans:400,700' rel='stylesheet' type='text/css'>

    <link rel="import" href="packages/paper_elements/paper_button.html">
    <link rel="import" href="packages/paper_elements/paper_dialog_transition.html">
    <link rel="import" href="packages/paper_elements/paper_dialog.html">

    <link rel="stylesheet" href="css/reset.css"> <!-- CSS reset -->
    <link rel="stylesheet" href="css/style.css"> <!-- Resource style -->


    <paper-button id="infoUPC" class="cd-read-more" raised>Read more</paper-button>
    <a href="http://education.dart">http://education.dart</a>
    <a href=""></a>
    <a href="http://js/main.js">http://js/main.js</a> <!-- Resource jQuery -->
    <a href="http://js/modernizr.js">http://js/modernizr.js</a> <!-- Modernizr -->


import 'package:polymer/polymer.dart';
import 'dart:html';
import 'package:paper_elements/paper_dialog.dart';

main() {
  initPolymer().run(() {
    Polymer.onReady.then((_) {

              (_) => toggleDialog('fhv'));
              (_) => toggleDialog('upc'));

              (_) => toggleDialog('tu'));

toggleDialog(language) =>
(querySelector('paper-dialog[edu=$language]') as PaperDialog)


name: polydart_resume
version: 0.0.1
author: Shady
description: Test app
  core_elements: '>=0.3.2 <0.5.0'
  custom_element_apigen: ">= 0.1.1 <0.2.0"
  polymer: ">=0.14.0 <0.16.0"
  web_components: ">=0.9.0 <0.10.0"
  paper_elements: ">=0.5.0 <0.6.0"
- polymer:
    - web/index.html

pub build does not give me any warnings or errors on these files, but I’m surely missing something right?


Answered By: Anonymous

You have two entry pages index.html and languages.html. Only languages.html calls your custom main() but only index.html is in your pubspec.yaml transformer configuration.

index.html will invoke the default main() method provided by Polymer but not your custom main() because of this script tag

<script type="application/dart">export 'package:polymer/init.dart';</script>

languages.html has the correct script tag

<a href="http://languages.dart">http://languages.dart</a>

but this doesn’t work as expected because languages.html is not listed in your Polymer transformer entry_points configuration

- polymer:
#    - web/index.html
    - web/languages.html

From the comments:

Q: Do you load languages.html from a link in drawer.html (<core-item label="Languages" url="chapters/languages.html"></core-item>)? – Günter Zöchbauer 25 mins ago

A: Yessir thats exactly what I’m doing.

This isn’t how one usually develops applications in Dart. You can, but Dart is for SPA (

If you load another page from a Dart application this is like launching an entirly different application. Each page (app) loaded this way needs all parts of a Polymer application to work.

Usually in Dart you have only one entry page (entry_point) and when you want to change what is shown to the user (a new view) you replace the content in the current page instead of loading another one (this is for example where Polymer elements are handy for, you just remove one element (view) and add another one).

Dart also has a rather large boilerplate code size which has to be loaded each time you load another page which is rather inefficient.

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