I have created two Dart app using Polymer. The two tags created are: weather-tag and qotd-tag.
In weather-tag, I am getting weather information from a remote service and in qotd-tag I am getting qotd from local machine. Both running fine in Dart and also in compiled JS.
I am now integrating these two Dart "widget" into my own index.html.
The HTML snippet is like following:
<html lang="zh-CN">
<head>
<script src="/packages/shadow_dom/shadow_dom.debug.js"></script>
<script src="/packages/custom_element/custom-elements.debug.js"></script>
<script src="/packages/browser/interop.js"></script>
<meta charset="utf-8">
<script src="/getqotd.html_bootstrap.dart.js"></script>
<script src="/getweather.html_bootstrap.dart.js"></script>
</head>
<body id="home">
<polymer-element name="qotd-tag">
<template>...
</template>
</polymer-element>
<polymer-element name="weather-tag">
<template>...
</template>
</polymer-element>
<weather-tag></weather-tag>
<qotd-tag></qotd-tag>
</body>
</html>
The problem is it only shows the qotd-tag.
If I took out all qotd-tag related reference (js, polymer-element, the tag), weather-tag can be displayed correctly.
If I change the sequence of the two js file (weather.js comes first and then qotd.js), now it shows only the weather-tag.
I think there must be some conflict in the js declaration.
I can solve this issue by building a new tag with the two tags' functions but is there a way to have two or more polymer-element in one HTML file?
This is how you can import and use two elements in a Dart app:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<link rel="import" href="foo_element.html">
<link rel="import" href="bar_element.html">
<script type="application/dart">export 'package:polymer/init.dart';</script>
<script src="packages/browser/dart.js"></script>
</head>
<body>
<foo-element></foo-element>
<bar-element></bar-element>
</body>
</html>
For the full code, look at this gist:
https://gist.github.com/shailen/8055849
Related
i downloaded the nicedit with mathtype js plugin files
but i cannot setup the editor
i get the window.opener is null error
second thing i cannot find the com.wiris.jsEditor class in any js files
<i><!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<textarea name="area"></textarea>
<div id="editorContainer">
</div>
<script src="../js/nicEdit.js"></script>
<script>
_wrs_currentPath = "/var/www/html/nicedit/"
nicedit_wiris_path = "nicedit_wiris"
</script>
<script src="../nicedit_wiris/core/WIRISplugins.js?viewer_image"></script>
<script src="../nicedit_wiris/nicedit_wiris.js"></script>
<script src="../nicedit_wiris/core/core.js"></script>
<script src="../nicedit_wiris/core/display.js"></script>
<script src="../nicedit_wiris/core/displaymathml.js"></script>
<script src="../nicedit_wiris/core/cas.js"></script>
<script src="../nicedit_wiris/core/editor.js"></script>
<script>
bkLib.onDomLoaded(function () {
nicEditors.allTextAreas()
// editor = new com.wiris.jsEditor.JsEditor('editor', null);
});
</script>
</body>
</html></i>
unfortunately, we do not give support to NicEdit anymore. The version of the MathType plugin that you have is 5 years old and does not work for the current version of NicEditor.
On the other hand, we do have MathType plugins implementations for the main HTML editors like TinyMCE, CKEditor or Froala.
In case you really need to use NicEdit, you could build your own implementation upon our Generic integration. In that case, we will give some assistance. Please, find some documentation below.
https://www.npmjs.com/package/#wiris/mathtype-generic
Best!
What imports and script tags are required to make an client app using Polymer.dart work properly?
<!DOCTYPE html>
<head>
<script src="packages/web_components/webcomponents-lite.min.js"></script>
<script src="packages/browser/dart.js"></script>
</head>
<body unresolved>
<my-element></my-element>
<script type="application/dart" src="index.dart"></script>
</body>
</html>
The webcomponents-lite.min.js script adds the Polymer polyfills.
The dart.js is necessary for every Dart browser application to run in browsers without Dart VM.
The index.dart contains your custom main(); and imports <my-element> using #HtmlImports(...)
where index.dart contains
import 'package:polymer/polymer.dart';
import 'my_element.dart';
/// Silence analyzer [MyElement]
main() async {
await initPolymer();
}
Without a custom main
import elements using <link rel="import" ...> (discouraged)
<!DOCTYPE html>
<head>
<script src="packages/web_components/webcomponents-lite.min.js"></script>
<link rel="import" href="my_element.html">
</head>
<body unresolved>
<my-element></my-element>
<script type="application/dart">export 'package:polymer/init.dart';</script>
<script src="packages/browser/dart.js"></script>
</body>
</html>
or using #HtmlImport(...) for importing elements
<!DOCTYPE html>
<head>
<script src="packages/web_components/webcomponents-lite.min.js"></script>
</head>
<body unresolved>
<my-element></my-element>
<script type="application/dart">
export 'package:polymer/init.dart';
import 'my_element.dart';
</script>
<script src="packages/browser/dart.js"></script>
</body>
</html>
Hint:
Without an explicit script tag for main it's more difficult to register the entry-point for the reflectable transformer. Some name for a generated file can be used instead but I don't know yet what this files name is.
I like to use my custom Polymer Element named content-page in my main-html.
Therefore I created a div with the id="contentcontainer" which contains my content-page.
For some reason it crashes, just after clicking on Run and the Dart Editor says: .
When I delete the line <link rel="import" href="content-page.html"> in main.html, the program isnt crashing, but there seems to be a Problem with the content of my main().
I unfortunately have no specific question, because I dont know where the error might be or where to start. Does someone see some suspicious parts in my code?
Thanks for helping!
main.dart:
import 'dart:html';
void main() {
var newElement = new Element.tag('content-page');
querySelector('#contentcontainer').children.add(newElement);
}
main.html:
<!DOCTYPE html>
<head>
<meta charset="utf-8" />
<link rel="stylesheet" type="text/css" href="style.css">
<script type="application/dart" src="main.dart"></script>
<script src="packages/web_components/dart_support.js"></script>
<link rel="import" href="content-page.html">
</head>
<body>
<div id="contentcontainer">
<content-page id="contentpage"></content-page>
</div>
<script type="application/dart">export 'package:polymer/init.dart';</script>
</body>
</html>
content-page.dart:
import 'package:polymer/polymer.dart';
import 'dart:html';
#CustomTag('content-page')
class ContentPage extends PolymerElement {
ContentPage.created() : super.created();
}
content-page.html:
<link rel="import" href="../packages/polymer/polymer.html">
<polymer-element name="content-page" >
<template>
<div>
ContentPage-Content
</div>
</template>
<script type="application/dart" src="content-page.dart"></script>
</polymer-element>
I tried your code and it's ok. Have you added the transformers to your pubspec.yaml?
name: sample
description: A sample web application
dependencies:
browser: any
polymer: any
transformers:
- polymer
You should have a look at this question/answer: how to implement a main function in polymer apps how to use a custom main method in a Polymer project.
This line should contain your file containing your main method (see also the answer in the linked question):
<script type="application/dart">export 'package:polymer/init.dart';</script>
this line is then redundant
<script type="application/dart" src="main.dart"></script>
the transformer configuration also needs a list of entry pages if you don't use the latest Polymer version
transformers:
- polymer:
entry_points:
- web/index.html
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 find a clean way to use twice a SVG element I've created. I want to learn using all technologies related to dart so I'm experimenting with Polymer. I've created a custom element where I then load another custom element twice.
This is the index.html
<link rel="import" href="da-imageTool.html">
</head>
<body>
<da-imageTool ></da-imageTool>
<script type="application/dart">export 'package:polymer/init.dart';</script>
<script src="packages/browser/dart.js"></script>
<script src="packages/browser/interop.js"></script>
</body>
da-imageTool.html
<polymer-element name="da-imageTool">
<template>
<div class="images" id="mainDiv"></div>
<div class="images" id="secondDiv"></div>
</template>
<script src="da-imageTool.dart" type="application/dart"></script>
</polymer-element>
da-imageTool.dart
#CustomTag('da-imageTool')
class ImageTool extends PolymerElement{
DivElement div1;
DivElement div2;
ImageEditor ime;
//ImageEditor ime2;
//ImageEditor _selectedEditor;
ImageTool.created(): super.created(){
int a = 1;
}
}
int a = 1 is just a line where I set a breakpoint to find out why all this does not work.
I don't understand why but the element isn't created. Here is the error I get:
Exception: The null object does not have a getter '_observe#0x29474386'.
NoSuchMethodError : method not found: '_observe#0x29474386'
Receiver: null
Arguments: []
HtmlElement&Polymer.observeProperties (package:polymer/src/instance.dart:514:34)
HtmlElement&Polymer.prepareElement (package:polymer/src/instance.dart:153:22)
HtmlElement&Polymer.polymerCreated (package:polymer/src/instance.dart:139:21)
PolymerElement.PolymerElement.created (package:polymer/src/instance.dart:1088:19)
ImageTool.ImageTool.created (http://localhost:3030/FigureSVG/web/da-imageTool.dart:17:24)
The script tags go into the head with Polymer
not sure about the interop.js script.
<head>
<link rel="import" href="da-imageTool.html">
<script type="application/dart">export 'package:polymer/init.dart';</script>
<script src="packages/browser/dart.js"></script>
</head>
<body>
<da-imageTool ></da-imageTool>
<script src="packages/browser/interop.js"></script>
</body>
I did several tests and right now my code is dead simple. The correction that made it working are:
Move the script tags
Rename the custom element all lowercase.
I remember having read about the compulsory hypen, but I've not seen anything about lowercase :( A warning might have been useful.