dart-js-interop | 易学教程

How to use javascript from Dart inside a polymer element

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I am trying to modify sample-google-maps to work inside a polymer element. On running following code I don't see anything except the title and there are no errors.Please advise how can I make this work. In longer run I want to define additional components using google-chart api and Polymer dart. Can someone point me to a worked out example. index.html <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>DEMO</title> <script type="text/javascript" src="packages/web_components/platform.js"></script> <link rel="import"

Issue with chrome.runtime.onConnect when building chrome extension in dart

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I have the following problem when running dart2js compiled version of my chrome extension: Uncaught TypeError: undefined is not a function when executing context['chrome']['runtime']['onConnect'].callMethod('addListener', [(port) { ... }]); I have created an example which possibly points to the cause: background.dart import 'dart:js'; void main() { print("main(): context['chrome']['runtime']['onConnect'] (${context['chrome']['runtime']['onConnect'].runtimeType}): ${context['chrome']['runtime']['onConnect']}"); } prints in Dartium: main(): context['chrome']['runtime']['onConnect'] (JsObject):

How to map a Dart class to a JS “class” with the new js 0.6.0 package?

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index.html <!doctype html> <html> <head> </head> <script> var Apple = function(type) { this.type = type; this.color = "red"; }; Apple.prototype.getInfo = function() { return this.color + ' ' + this.type + ' apple'; }; </script> <body> <script type="application/dart" src="index.dart"></script> <script src="packages/browser/dart.js"></script> </body> </html> index.dart import 'dart:js' as js; import 'dart:html' as dom; import 'package:js/js.dart'; main() { // this works fine var apple = new js.JsObject(js.context['Apple'], ['Macintosh']); print(apple.callMethod('getInfo', [])); print(new Apple()

How to embed a jquery ui widget into a polymer-dart webcomponent

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I try to embed a jquery ui widget, f.e. a datepicker into a polymer-dart webcomponent. The Webcomponent is defined like that: <polymer-element name="my-datepicker"> <template> <div id="datepicker"></div> </template> <script type="application/dart" src="clickcounter.dart"></script> </polymer-element> The initialisation of this widget is done in JS like that <script> $(function() { $( "#datepicker" ).datepicker();}); </script> How can I initialize that widget in dart in my polymer.dart webcomponent. I tried with 'dart:js' to call that method, but I cannot access the shadow dom with dart:js. With

How do I create an anonymous JavaScript function/callback with Dart's JS interop?

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问题 I am using Dart and its JS interop. I need to convert the following JavaScript code to Dart: ID3.loadTags("filename.mp3", function() { var tags = ID3.getAllTags("filename.mp3"); if (tags.artist) artist.textContent = tags.artist; if (tags.title) track.textContent = tags.title; }, { dataReader: FileAPIReader(file) }); Note the anonymous callback as the second parameter to loadTags . How do I create that with Dart and the dart:js library? The closest I got was creating a named function with: js

What is a difference between dart:js and js package?

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问题 Everywhere in Dart documentation it is recommended to use js package for javascript interoperability. However, I have recently found that dart:js package exists in SDK that seems to have similar (but not same) interface. Are there any differences between these packages? Are they feature equivalent? Which one is recommended? 回答1: Js interop started with package:js. It was built with with window.postMessage. Later dart:js has been added to provide better performance and reduce the size of the

Google Dart Only Show Specific DropDown Child Elements

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问题 I'm attempting to get only certain values from a drop-down by hiding a select few. Apparently I cannot go over an array index of 3 or nothing shows up and obviously not below an index of 0. I'm trying to hide the first three choices in the drop-down. Any ideas would be appreciated. Please let me know if you need more information. The printout: Select a choice --disabled Choice 1 Choice 2 Choice 3 Choice 4 Choice 5 Code: List<Map> _predefinedFilterList; _predefinedFilterList = jsonObject[

How do you interact with js from dart?

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问题 No, this isn't the same as the other question of the same name. There are seemingly identical packages which seem to do this, but with different apis. http://dart-lang.github.io/js-interop/docs/js.html https://api.dartlang.org/docs/channels/stable/latest/dart_js.html Why are there two? Which one are we supposed to use? The interop one looks newer and has a better api, but doesn't actually work. According to the documentation, you should be able to convert this javascript: var stage = new PIXI

Google Dart Only Show Specific DropDown Child Elements

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I'm attempting to get only certain values from a drop-down by hiding a select few. Apparently I cannot go over an array index of 3 or nothing shows up and obviously not below an index of 0. I'm trying to hide the first three choices in the drop-down. Any ideas would be appreciated. Please let me know if you need more information. The printout: Select a choice --disabled Choice 1 Choice 2 Choice 3 Choice 4 Choice 5 Code: List<Map> _predefinedFilterList; _predefinedFilterList = jsonObject["jsonResponse"] as List<Map>; for (Map filterMap in _predefinedFilterList) { dropDownEl.children.add(new

How do you interact with js from dart?

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No, this isn't the same as the other question of the same name. There are seemingly identical packages which seem to do this, but with different apis. http://dart-lang.github.io/js-interop/docs/js.html https://api.dartlang.org/docs/channels/stable/latest/dart_js.html Why are there two? Which one are we supposed to use? The interop one looks newer and has a better api, but doesn't actually work. According to the documentation, you should be able to convert this javascript: var stage = new PIXI.Stage(0xFFFFFF);; renderer = PIXI.autoDetectRenderer(800, 600); document.body.appendChild(renderer