Polymer paper-dialog not showing up on click in chrome

Question

I'm using the newest polymer starter kit 2.0, I have this code down below, and trying to open the dialog but nothing happens in chrome (it's working in Firefox just fine):

<paper-fab icon="zoom-in" onclick="dialog.open()"></paper-fab>
<paper-dialog id="dialog">
   <h3>text</h3>
   <div class="buttons">
     <paper-button dialog-confirm>Close</paper-button>
   </div>
</paper-dialog>

I've imported

<link rel="import" href="../bower_components/paper-dialog/paper-dialog.html">
<link rel="import" href="../bower_components/paper-dialog-behavior/paper-dialog-behavior.html">

In "my-app.html"

And installed:

bower install --save PolymerElements/paper-dialog
bower install --save PolymerElements/paper-dialog-behavior

Any ideas on how to fix this problem?

Left - Firefox | Right - Chrome/opera

UPDATE:

I have the default polymer starter kit 2.0 project with some elements added to the pages.

I'm using polymer serve to cast the pages to localhost:8080

I've just created another page: src/my-testpage.html

And added <my-testpage name="testpage"></my-testpage> to iron pages in "my-app.html"

Initial code:

<!--
@license
Copyright (c) 2016 The Polymer Project Authors. All rights reserved.
This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
Code distributed by Google as part of the polymer project is also
subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
-->

<link rel="import" href="../bower_components/polymer/polymer.html">
<link rel="import" href="shared-styles.html">

<dom-module id="my-testpage">
  <template>
    <style include="shared-styles">
      :host {
        display: block;
        padding: 10%;
        padding-left: 20%;
        padding-right: 20%;
      }
    </style>

    <paper-fab icon="zoom-in" onclick="dialog.open()"></paper-fab>
    <paper-dialog id="dialog">
       <h3>text</h3>
       <div class="buttons">
         <paper-button dialog-confirm>Close</paper-button>
       </div>
    </paper-dialog>
  </template>

  <script>
    Polymer({
      is: 'my-testpage'
    });
  </script>
</dom-module>

RESULT: Works in Firefox and EDGE, doesn't work in chromium based browsers - Chrome/Opera:

Console shows:

testpage:1 
Uncaught ReferenceError: dialog is not defined
  onclick @ testpage:1

Suggested solution 1:

Use this instead: onclick="document.getElementById('dialog').open()

<!--
@license
Copyright (c) 2016 The Polymer Project Authors. All rights reserved.
This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
Code distributed by Google as part of the polymer project is also
subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
-->

<link rel="import" href="../bower_components/polymer/polymer.html">
<link rel="import" href="shared-styles.html">

<dom-module id="my-testpage">
  <template>
    <style include="shared-styles">
      :host {
        display: block;
        padding: 10%;
        padding-left: 20%;
        padding-right: 20%;
      }
    </style>

    <paper-fab icon="zoom-in" onclick="document.getElementById('dialog').open()"></paper-fab>
    <paper-dialog id="dialog">
       <h3>text</h3>
       <div class="buttons">
         <paper-button dialog-confirm>Close</paper-button>
       </div>
    </paper-dialog>
  </template>

  <script>
    Polymer({
      is: 'my-testpage'
    });
  </script>
</dom-module>

RESULT: Works in Firefox and EDGE, doesn't work in chromium based browsers - Chrome/Opera: Console shows:

testpage:1 
Uncaught TypeError: Cannot read property 'open' of null
  onclick @ 

Suggested solution 2:

<!--
@license
Copyright (c) 2016 The Polymer Project Authors. All rights reserved.
This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
Code distributed by Google as part of the polymer project is also
subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
-->

<link rel="import" href="../bower_components/polymer/polymer.html">
<link rel="import" href="shared-styles.html">

<dom-module id="my-testpage">
  <template is="dom-bind" id="t">
    <style include="shared-styles">
      :host {
        display: block;
        padding: 10%;
        padding-left: 20%;
        padding-right: 20%;
      }
    </style>
       <paper-fab icon="zoom-in" on-tap="openDialog"></paper-fab>
       <paper-dialog id="dialog">
          <h3>text</h3>
          <div class="buttons">
            <paper-button dialog-confirm>Close</paper-button>
          </div>
       </paper-dialog>
    <script>
       var t = document.getElementById('t');
       t.openDialog = function() {
         t.$.dialog.open();
       };
    </script>

  </template>

  <script>
    Polymer({
      is: 'my-testpage'
    });
  </script>
</dom-module>

result:

    .polymer-micro.html.js:265:1
    [my-testpage::_createEventHandler]: listener method `openDialog` not defined

Answer 1

It looks like you might be relying on named access on the Window object, which should be avoided.

Instead, use document.getElementById('dialog') as shown in this snippet:

<head>
  <base href="https://polygit.org/polymer+1.9.3/components/">
  <script src="webcomponentsjs/webcomponents-lite.js"></script>
  <link rel="import" href="polymer/polymer.html">
  <link rel="import" href="iron-icons/iron-icons.html">
  <link rel="import" href="paper-button/paper-button.html">
  <link rel="import" href="paper-fab/paper-fab.html">
  <link rel="import" href="paper-dialog/paper-dialog.html">
</head>
<body>
  <paper-fab icon="zoom-in" onclick="document.getElementById('dialog').open()"></paper-fab>
  <paper-dialog id="dialog">
     <h3>text</h3>
     <div class="buttons">
       <paper-button dialog-confirm>Close</paper-button>
     </div>
  </paper-dialog>
</body>

codepen

Alternatively, you could use a tap-handler as shown in this snippet:

<head>
  <base href="https://polygit.org/polymer+1.9.3/components/">
  <script src="webcomponentsjs/webcomponents-lite.js"></script>
  <link rel="import" href="polymer/polymer.html">
  <link rel="import" href="iron-icons/iron-icons.html">
  <link rel="import" href="paper-button/paper-button.html">
  <link rel="import" href="paper-fab/paper-fab.html">
  <link rel="import" href="paper-dialog/paper-dialog.html">
</head>
<body unresolved>
  <template is="dom-bind" id="t">
    <paper-fab icon="zoom-in" on-tap="openDialog"></paper-fab>
    <paper-dialog id="dialog">
       <h3>text</h3>
       <div class="buttons">
         <paper-button dialog-confirm>Close</paper-button>
       </div>
    </paper-dialog>
  </template>
  <script>
    var t = document.getElementById('t');
    t.openDialog = function() {
      t.$.dialog.open();
    };
  </script>
</body>

codepen

UPDATE Your Polymer element code should look like this:

<dom-module id="my-testpage">
  <template>
    ...
    <paper-fab icon="zoom-in" on-tap="openDialog"></paper-fab>
    <paper-dialog id="dialog">
        <h3>text</h3>
        <div class="buttons">
          <paper-button dialog-confirm>Close</paper-button>
        </div>
    </paper-dialog>
  </template>

  <script>
    Polymer({
      is: 'my-testpage',

      openDialog: function() {
        this.$.dialog.open();
      }
    });
  </script>
</dom-module>