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[next] (web midi) window.navigator.requestMidiAccess() returns null #20082

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DartBot opened this issue Jul 17, 2014 · 8 comments
Closed

[next] (web midi) window.navigator.requestMidiAccess() returns null #20082

DartBot opened this issue Jul 17, 2014 · 8 comments
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area-core-library SDK core library issues (core, async, ...); use area-vm or area-web for platform specific libraries. area-web Use area-web for Dart web related issues, including the DDC and dart2js compilers and JS interop. library-html P2 A bug or feature request we're likely to work on type-bug Incorrect behavior (everything from a crash to more subtle misbehavior) web-libraries Issues impacting dart:html, etc., libraries

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@DartBot
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DartBot commented Jul 17, 2014

This issue was originally filed by dorbo...@gmail.com

What steps will reproduce the problem?

  1. Use Dartium Version 36.0.1985.97 (282401), Dart SDK version 1.6.0-dev.3.0

  2. Enable browser switch --enable-web-midi

  3. Try and run the following code in dartium

import 'dart:html';
void main() {

   window.navigator.requestMidiAccess().then( (a,b) => print("access"), (c) => print("error"));
}

What is the expected output?
The console should display either "access" or "error" text messages

What do you see instead?

Exception: The null object does not have a method 'then'.

NoSuchMethodError: method not found: 'then'
Receiver: null
Arguments: [Closure: (dynamic, dynamic) => dynamic, Closure: (dynamic) => dynamic]

What version of the product are you using?
1.6.0-dev.3.0

On what operating system?
Win7

What browser (if applicable)?
NA

Please provide any additional information below.

I'm able to use navigator.requestMidiAccess() successfully in javascript on the same dartium browser... so I know Midi works with this dartium browser.

I'm was tring to port http://webaudiodemos.appspot.com/monosynth/index.html
from javascript to dart. A similar example from the Dart Team would be really helpful.
@sethladd
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Removed Priority-Unassigned label.
Added Priority-Medium, Library-Html, Area-Library, Triaged labels.

@anders-sandholm
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Issue #21805 has been merged into this issue.

@anders-sandholm
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This issue came up again on misc (https://groups.google.com/a/dartlang.org/forum/#!topic/misc/FuLyWDlPoYc) and as a duplicate in issue #21805.

As rms notes a workaround exists:
    final js.JsObject w = new js.JsObject.fromBrowserObject(html.window);
    final js.JsObject n = w['navigator'];
    if (n.hasProperty('requestMIDIAccess')) {
      n.callMethod('requestMIDIAccess').callMethod('then',
          [(js.JsObject midiAccess) {
        // ...
      }]);
    }

But this seems like a giant hack.

Let's see if we can fix this?

@alan-knight
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Hoping this will get fixed with Terry's work on the next rev of html.

Changed the title to: "[next](web midi) window.navigator.requestMidiAccess() returns null".

@DartBot DartBot added Type-Defect library-html area-core-library SDK core library issues (core, async, ...); use area-vm or area-web for platform specific libraries. labels Jan 13, 2015
@kevmoo kevmoo added P2 A bug or feature request we're likely to work on type-bug Incorrect behavior (everything from a crash to more subtle misbehavior) and removed triaged labels Mar 1, 2016
@DanTup
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DanTup commented Jan 17, 2018

It's been three years since the comment above - my guess is that this didn't get fixed? (Still seems broken in current DartPad).

I might be interested in using this soon, is it something an outsider might be able to fix? Could anyone point me in the right direction to look?

@matanlurey matanlurey added closed-obsolete Closed as the reported issue is no longer relevant and removed closed-obsolete Closed as the reported issue is no longer relevant labels Jun 19, 2018
@vsmenon vsmenon added the area-web Use area-web for Dart web related issues, including the DDC and dart2js compilers and JS interop. label Jul 20, 2019
@xow xow mentioned this issue Aug 11, 2021
Closed
13 tasks
@sigmundch sigmundch added the web-libraries Issues impacting dart:html, etc., libraries label Oct 25, 2021
@maks
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maks commented Jan 2, 2022

I know this is the older issue, but should it be closed in favour of #33248 which seems to be more active and has more up to date?

@maks
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maks commented Feb 8, 2022 •
edited

@DanTup not sure if you are still interested in this topic, but I think I've finally tracked down what it takes to get Webmidi working with Dart (guess after almost 8 years, better late than never? 🙂 ) in my latest comment over on #33248 #33248 (comment)

But in debugging this I also found that DartPad seems to set a http policy header that also prevents use of Webmidi with Dartpad as I note your comment mentioned that you saw it not working there.

@DanTup
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DanTup commented Feb 8, 2022

@maks ah, interesting! I might be interested in this again in the future, but right now my drum kit (which this was a project for) is boxed up in the garage due to lack of space, so not likely something I'll look at in the near-term.

I think you're right that this is a dupe of #33248 though, so I'll subscribe there and close this one. Thanks!

@DanTup DanTup closed this as completed Feb 8, 2022
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area-core-library SDK core library issues (core, async, ...); use area-vm or area-web for platform specific libraries. area-web Use area-web for Dart web related issues, including the DDC and dart2js compilers and JS interop. library-html P2 A bug or feature request we're likely to work on type-bug Incorrect behavior (everything from a crash to more subtle misbehavior) web-libraries Issues impacting dart:html, etc., libraries
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@sethladd @kevmoo @maks @matanlurey @DanTup @sigmundch @vsmenon @anders-sandholm @alan-knight @DartBot