I am using Dart SDK 1.5.3 | polymer 0.11.0+5 | Windows x64. When I create a created a polymer application using the template 'Sample web application using the polymer library (mobile friendly) option' and run the application it works as expected with the counter incrementing when the button is clicked.
Assuming the page with the
<script type="application/dart">
export 'package:polymer/init.dart';
</script>
is index.html, attempting to refactor the application by removing the following lines from index.html
<click-counter count="5"></click-counter>
<link rel="import" href="clickcounter.html">
results in the following error:
Exception: NoSuchMethodError: method not found: 'whenPolymerReady'
Receiver: Instance of 'JsFunction'
Arguments: [Closure: () => dynamic] (package:polymer/src/loader.dart:115)
Breaking on exception: NoSuchMethodError: method not found: 'whenPolymerReady'
I have used the mechanism all the time in creating any polymer app, but has never seen such exception although I have seen documentation on the web involving Dart https://www.google.com.jm/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0CBwQFjAA&url=http%3A%2F%2Fcode.google.com%2Fp%2Fdart%2Fissues%2Fdetail%3Fid%3D19161&ei=MZq8U_nlK42KyASBkYHgCw&usg=AFQjCNHOc6MD-mhzPbDOmg8Hp5NeqVufqQ&bvm=bv.70138588,d.aWw
The documentation suggested that this problem had resolved but it certainly is present in the current polymer I am using.
Each of your components (each file containing a <polymer-element> tag) must import polymer.html.
Make sure your clickcounter.html contains the line:
<link rel="import" href="packages/polymer/polymer.html" />
at the top. (It was breaking change in 0.11).
I'm clueless about these things, but for me I seemed to solve it by moving the following code:
<!-- after the Polymer elements imports -->
<script type="application/dart">export 'package:polymer/init.dart';</script>
<script async src="packages/browser/dart.js"></script>
from the end of the <head>er, to just before the </body>.
Only my index.html now contains these lines. Lastly I also moved my custom element import above core-elements/paper-elements imports.
My dummy application created from the polymer template starts fine, but once I move the clickcounter to another directory, I start getting this error (I have updated references accordingly). My new folder structure is the following:
/lib
/src
/test
clickcounter.dart
clickcounter.html
/web
polytest.html
This is how the modified line looks:
<link rel="import" href="../lib/src/test/clickcounter.html">
I think I found the solution.
The clickcounter.html |imports link rel="import" href="packages/polymer/polymer.html|". In the entry-point file, there is no such import. When a component is imported into the entry-point, it seems that the polymer.html condition is satisfied. In the absence of a component the import has to placed directly in the file.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Sample app</title>
<!-- <script src="packages/web_components/platform.js"></script>
not necessary anymore with Polymer > 0.14.0 -->
<script src="packages/web_components/dart_support.js"></script>
<link rel="import" href="packages/polymer/polymer.html">
<script type="application/dart">export 'package:polymer/init.dart';</script>
<script src="packages/browser/dart.js"></script>
<link rel="stylesheet" href="epimss_material_design.css">
</head>
<body>
<h1>Epimss material design</h1>
<p>Hello world from Dart!</p>
<div id="sample_container_id">
</div>
</body>
</html>
After that everything worked fine.
The same problem actually resurfaced in Dart SDK 1.6.0-dev.1.2 and was similarly solved. Still, I cannot say if its a bug or not. It simply works by adding this import. I suppose if a legitimate component is used that imports would allow the removal of the same import from the entry-point file. One of Dart or Dart-polymer expert might be able to explain what actually is happening. Looking forward to the in-depth explanation since this is the first time I have observed this issue.
I just ran into the same issue.
Are you sure your polymer imports are underneath your javascript imports?
<!-- <script src="packages/web_components/platform.js"></script>
not necessary anymore with Polymer 0.14.0 -->
<script src="packages/web_components/dart_support.js"></script>
<!-- import the click-counter -->
<link rel="import" href="clickcounter.html">
instead of:
<!-- import the click-counter -->
<link rel="import" href="clickcounter.html">
<script src="packages/web_components/platform.js"></script>
<script src="packages/web_components/dart_support.js"></script>
I'm not in that development, but it seems like your problem is API or dependencies used in application.
I think your transformer settings is missing the entry page
transformers:
- polymer:
entry_points:
- example/index.html
Otherwise look closely at the output if there is any other warning or error that points to the root causel
I've just had exactly the same issue. It looked like the code stopped working without any change performed by me.
Root cause of the issue was, that there appeared a new version of polymer package.
So you should probably play with dependencies in your pubspec.yaml. I just explicitly changed the version of Polymer to some older one.
Related
core-icons contains different iconsets like
icons
av-icons
communication-icons
device-icons
hardware-icons
image-icons
maps-icons
notification-icons
png-icons
social-icons
It's not obvious how to use them.
Here is an overview of the icons contained in paper-elements http://polymer.github.io/core-icons/components/core-icons/demo.html
I created an example that demonstrates how to use them.
<!DOCTYPE html>
<html>
<head>
<title>core-icons</title>
<!-- <script src="packages/web_components/platform.js"></script>
not necessary anymore with Polymer >= 0.14.0 -->
<script src="packages/web_components/dart_support.js"></script>
<link rel="import" href="packages/paper_elements/paper_icon_button.html">
<!-- choose the name according to the set you want to load - "social-icons" -->
<!-- this is now accessible with a simpler path
<link rel="import" href="packages/core_elements/src/core-icons/iconsets/social-icons.html">
<link rel="import" href="packages/core_elements/core_icons/iconsets/social_icons.html">
this changed again with core-elements 0.2.0+1 -->
<link rel="import" href="packages/core_elements/social_icons.html">
</head>
<body>
<!-- use the icon by setting the `icon` attribute. The value consists of iconsset-id a colon followed by the icon name. -->
<paper-icon-button id="bookmark-button" icon="social:plus-one" style="fill:steelblue;"></paper-icon-button>
<script type="application/dart">export 'package:polymer/init.dart';</script>
</body>
</html>
EDIT
You can style the icons from Dart code like
($['bookmark-button'] as dom.Element).querySelector('* /deep/ #icon').style
..setProperty('fill', 'red')
..setProperty('stroke', 'blue')
..setProperty('stroke-with', '3px');
This turned out to be quite a bit tricky because the paper-icon-button has more than one shadowRoot (3 actually) and when I set the style on the <g> element (inside the <core-icon>) it was applied but reverted shortly afterwards for unknown reasons.
I just saw that this doesn't work in Firefox. The polyfill for /deep/ in querySelector() is work in Progress as far as I know. Maybe it will work better as soon as the current Polymer release has been integrated in Polymer.Dart.
This worked in both Dartium and Firefox:
($['bookmark-button'] as dom.Element).shadowRoot.olderShadowRoot.querySelector('#icon').style
..setProperty('fill', 'red')
..setProperty('stroke', 'blue')
..setProperty('stroke-with', '3px');
This solution might break when the implementation of <paper-icon-button> is changed but hopefully in a while the first attempt will work in all browsers soon.
EDIT
Polyfill support for /deep/ in querySelector is included in Polymer.js 0.4.0. Hopefully the next Polymer.dart update includes it as well.
I am working through the dart todo sample application. I haven't changed any code but I see lots of squiggles in the editor.
<polymer-element name="simple-router">
<script type="application/dart;component=1"
src="simple_router.dart"></script>
</polymer-element>
The error I'm seeing reads.
Wrong script type, expected
type="application/dart".
I don't understand what this means. When I strip off the ;component=1. It really breaks the application.
This is code that was valid in Polymer about ">= 0.10.5 <0.11.0" but there were several changes.
;component=1 Should be remove from all script tags.
The imports and script tags in the entry page should look like
<html>
<head>
<title>core-ajax-dart</title>
<!-- when the project uses polymer -->
<!-- <script src="packages/web_components/platform.js"></script>
not necessary anymore with Polymer >= 0.14.0 -->
<script src="packages/web_components/dart_support.js"></script>
<!-- import individual polymer elements -->
<link rel='import' href='packages/core_elements/core_ajax_dart.html'>
</head>
<body>
<core-ajax-dart
url="http://gdata.youtube.com/feeds/api/videos/"
params='{"alt":"json", "q":"chrome"}'
handleAs="json"
auto></core-ajax-dart>
<!-- if you have a custom script file that contains a main() method -->
<script type="application/dart" src="core_ajax_dart.dart"></script>
<!-- else if you don't have a custom script file with a main() method
<script type="application/dart">export 'package:polymer/init.dart';</script>
</body>
</html>
see here how to implement a custom main method.
how to implement a main function in polymer apps
i am using Dart 1.4.3, polymer 0.11.0-dev.6. now i have noticed that all my polymer-dart components give a warning about adding the link for polymer in the title above
to all polymer components. is this so. please also point me to some documentation about the changes of polymer version changes so i can keep abreast.
https://groups.google.com/a/dartlang.org/forum/#!topic/web/KIOlOvpr2-8
in each file where you define Polymer elements you should add as first import
<link rel="import" href="../../packages/polymer/polymer.html">
and in the entry page you add these script tags instead of importing polymer.html
<!-- <script src="packages/web_components/platform.js"></script>
not necessary anymore with Polymer >= 0.14.0 -->
<script src="packages/web_components/dart_support.js"></script>
The Dart editor currently supports only one dart polymer (/file) new project generation option. And this option sets up 4 files in the /web subdir without a main(), and arriving at a main requires some boiler-plate changes that were not totally obvious to me.
I was helped on the Dart Forum for this somewhat "howto" question by Guenter Zoeckbauer, so I want to share the results of those minimal changes to this nice minimal project, that has provided me with exactly the starting point need to re-base my outdated code and file structure on.
It seems to me it provides good starting point reference for re-building apps that have gotten out of date with all the rapid and IMPORTANT changes that have been made in the last few months.
Here are the 6 files as they must be modified (the app name is: app_with_main):
1 app_with_main.css NO CHANGE
2 clickcounter.dart NO CHANGE
3 clickcounter.html NO CHANGE
4 index.html:
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Sample app</title>
<!-- <script src="packages/web_components/platform.js"></script>
not necessary anymore with Polymer >= 0.14.0 -->
<script src="packages/web_components/dart_support.js"></script>
<link rel="import" href="clickcounter.html">
<!-- ORIGINAL SCRIPT
<script type="application/dart">export 'package:polymer/init.dart';</script>
<script src="packages/browser/dart.js"></script>
-->
<link rel="stylesheet" href="app_with_main.css">
</head>
<body>
<h1>App with main</h1>
<p>Hello world from Dart!</p>
<div id="sample_container_id">
<click-counter count="5"></click-counter>
</div>
<script type="application/dart">export 'init.dart';</script>
</body>
</html>
#5 . init.dart (new)
import "package:polymer/polymer.dart";
main() {
print("always before polymer initialization is complete");
initPolymer().run(() {
print('''Code here will be called almost immediately and cannot rely
on the polymer elements being instantiated.''');
Polymer.onReady.then((_) {
print('''at this point the onReady callback has been returned and thus the polymer
initialization process will be complete''');
});
});
6 The project yaml file must be modified to set the entry_point to index.html thus:
name: app_with_main
description: A sample Polymer application
dependencies:
polymer: ">=0.11.0-dev.2 <0.12.0"
transformers:
- polymer:
entry_points: web/index.html
And that should do it, you should be off and running with a code structure that can grow with your project for a long time....
Thanks again to Dart Super Hero Guenter Zoecchbauer!
For reference and comparison I think it is useful to also consider the skeleton Polymer Dart app that gets generated by the Chrome Dev Editor. It includes a Dart main().
Below I've posted index.html, and main.dart from the web folder of a freshly generated Polymer Dart Paper elements project (as of 2014-10-10).
Note that these reference a sample_app custom element which gets generated into the lib folder, but pasting that below as well would be too long.
1. Index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>HelloDartWebPaper</title>
<link rel="stylesheet" href="styles.css">
<script src="packages/web_components/platform.js"></script>
<script src="packages/web_components/dart_support.js"></script>
<link rel="import" href="packages/HelloDartWebPaper/sample_app.html">
</head>
<body unresolved>
<sample-app></sample-app>
<script src="main.dart" type="application/dart"></script>
<script src="packages/browser/dart.js"></script>
</body>
</html>
2. main.dart
import 'package:polymer/polymer.dart';
import 'package:paper_elements/paper_toast.dart';
import 'package:HelloDartWebPaper/sample_app.dart';
void main() {
// Init polymer.
initPolymer();
// Register Polymer components (ones that are actually used in the app).
registerWidgetsWithPolymer();
}
#initMethod
void postPolymerBoot() {
print('Polymer init complete.');
}
void registerWidgetsWithPolymer() {
upgradePaperToast();
Polymer.register('sample-app', SampleApp);
}
styles.css
omitted - not relevant
sample_app component in lib.
I'm trying to write a custom element in dart/polymer but nothing renders and no errors are displayed. Does anyone know what I'm doing wrong? All the details are in the following gist.
https://gist.github.com/heuristicat/7947755
Thanks.
I found the problem. The following line...
<link rel="import" src="hello-world.html">
should have been...
<link rel="import" href="hello-world.html">
It is so obvious but all the src attributes in the script tags played tricks on my mind.
Thanks.
For Polymer you need the following script tags within the <head> tag after any element imports
<script type='application/dart'>
export 'package:polymer/init.dart';
</script>
<script src="packages/browser/dart.js"></script>