dart-html | 易学教程

How can I create a new subclass extends a ButtonElement

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问题 import dart:html , I can create a new subclass MyButton of ButtonElement with factory constructor ,and add some new function such as getButtonName(){} ... when it's running ,I get a instance MyButton btn=new MyButton() But the instance "btn" runtime type is still ButtonElement , and can't call the getButtonName() function. If I use btn as MyButton then I get this error Uncaught CastError: Casting value of type ButtonElement to incompatible type MyButton Here is the code class MyButton extends

dart upload file input type file

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问题 Using Dart and Golang for a small app and looking to upload a file to server. Found something like this and placed it in my .dart file: InputElement uploadInput = query('#file'); // my input type file uploadInput.on.change.add((e) { // read file content as dataURL final files = uploadInput.files; if (files.length == 1) { final file = files[0]; final reader = new FileReader(); reader.on.load.add((e) { sendDatas(reader.result); }); reader.readAsDataURL(file); } }); but getting the following

Mustache Template usage in Dart

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问题 Fairly recent to web programming and all apologies for asking a basic question. In the test.dart file, a template is created and populated as below import 'dart:html'; // IMPORT MUSTACHE FOR TEMPLATES import 'package:mustache/mustache.dart' as mustache; function loadData() { // some script ..... output = template.renderString({ 'data_cell': [ {'event_title': TitleOne,'event_desc' : Desc},]}); } In the test.html file, how can I insert the "output" in the below "data_cell" div. <body> <p id=

How to make HTTPS request using HttpClient in dart?

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问题 I'm using HttpClient from dart (dart:io package, NOT dart:http) and I'd like to send an HTTPS request. Is there a way to do that? I can't seem to find a method that would allow me that. 回答1: new HttpClient().getUrl(Uri.parse('https://www.somedomain.com')); 来源： https://stackoverflow.com/questions/21703406/how-to-make-https-request-using-httpclient-in-dart

Use DartAngular with dart:html

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问题 Is it possible to use default dart library html with angular dart? ie: class Test1Component implements OnInit{ @override void ngOnInit() { ButtonElement button = querySelector('button'); //Broken code, avoid button to be null. button.onClick.listen(onClick); } void onClick(Event e){ print('Button clicked'); } } How can I avoid to get a 'null' button without the using any timers? Basically I'm using only angular just for the Routes and but I'd like to stick with dart:html to control the DOM

Make picture from base64 on client-side

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问题 How to make a picture from a base64-string to send it to server by using HttpRequest.request? For example, I have the following base64-string: ' data:image/jpeg;base64 ,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg==' Instead of sending it I would like to post a jpeg to server? Is it possible? 回答1: Convert Base64 to bytes How to native convert string -> base64 and base64 -> string Upload binary as image Dart how to upload

Downloading a file using Dart GDrive api with authorized GET request

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问题 I'm coding in Dart and need to download a file (i.e. an image file) from google GDrive using OAuth2.0. I am at the point in my code where I have the downloadURL after having used the Dart drive_v2_api_browser client library. I tried directly passing this to the " src " attribute _image = new ImageElement(src: file.downloadUrl, width: file.imageMediaMetadata.width, height: file.imageMediaMetadata.height); _image.onLoad.listen(onData, onError: onError, onDone: onDone, cancelOnError: true); but

Dart: “Invalid argument(s): Illegal character in path” when building on Windows

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问题 The offending line in my index.html file reads <script src="main.dart" type="application/dart"></script> The error report is: Build error: Transform polymer (PolymerBootstrapTransformer) on myproj_frontend|web/index.html threw error: Invalid argument(s): Illegal character in path dart:core/uri.dart 855 Uri._checkWindowsPathReservedCharacters dart:core/uri.dart 956 Uri._makeWindowsFileUrl The entire path to the project is D:\Projects\MyProj\MyProj_Project I'm building from command line on

Dart login/logout example

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问题 I'm trying to find a simple example of user authentication with Dart. So far the closest I've found is https://github.com/dart-lang/bleeding_edge/blob/master/dart/tests/standalone/io/http_auth_test.dart. Can anyone direct or provide me to a working example of server side authentication using Dart. Thanks in advance. 回答1: Authentication is a vast topic and you didn't specify much what you want to achieve, but let me guide you to build a Facebook authentication for you Dart application, because

Dart SVG Translate an object

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问题 I'm trying to translate an ellipse in SVG with Dart. I haven't found any explanation on how to do that, other than the SetAttribute way ellipse.setAttribute('transform', 'translate($acx, $acy)'); I have found that the EllipseElement has a notation like this: ellipse.transform.baseVal[...].setTranslate(acx,acy); ..but it doesn't work. I'm totally not sure how setTranslate works and I suppose I have to tell which element to translate but I have no idea how. Is it better to use setATtribute