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dart2js document.hidden returns null in firefox #13411

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DartBot opened this issue Sep 18, 2013 · 9 comments
Closed

dart2js document.hidden returns null in firefox #13411

DartBot opened this issue Sep 18, 2013 · 9 comments
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area-core-library SDK core library issues (core, async, ...); use area-vm or area-web for platform specific libraries. closed-obsolete Closed as the reported issue is no longer relevant 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)

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@DartBot
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DartBot commented Sep 18, 2013

This issue was originally filed by everton.marqu...@gmail.com

What steps will reproduce the problem?

  1. create a web app with the attached hidden.dart
  2. compile with dart2js -c
  3. open with firefox

What is the expected output?
document.hidden : true OR false (non-null)

What do you see instead?
document.hidden : null

What version of the product are you using?
Dart Editor version 0.7.3_r27487
Dart SDK version 0.7.3.1_r27487
Firefox 24

On what operating system?
64-bit Windows 7

Please provide any additional information below.

I see the following output from hidden.dart:

Dartium:

document.hidden : false

hidden : false
hidden == null : false
hidden is bool : true

dart2js + Chrome:

document.hidden : false

hidden : false
hidden == null : false
hidden is bool : true

dart2js + Firefox:

document.hidden : null

hidden : null
hidden == null : true
hidden is bool : false

Attachment:
hidden.dart (488 Bytes)
@floitschG
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Added Area-HTML, Triaged labels.

@efortuna
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efortuna commented Oct 3, 2013

Added html-api label.

@blois
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blois commented Oct 3, 2013

Added this to the Later milestone.
Removed html-api label.

@DartBot
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DartBot commented Oct 4, 2013

This comment was originally written by everton.mar...@gmail.com

This issue affects the Page Visibility API for Dart:

http://www.w3.org/TR/2011/WD-page-visibility-20110602/

@kevmoo
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kevmoo commented Apr 7, 2014

Removed Area-HTML label.
Added Area-Library, Library-Html labels.

@kasperl
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kasperl commented Jul 10, 2014

Removed this from the Later milestone.
Added Oldschool-Milestone-Later label.

@kasperl
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kasperl commented Aug 4, 2014

Removed Oldschool-Milestone-Later label.

@DartBot
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DartBot commented Nov 7, 2014

This comment was originally written by matthew1...@gmail.com

The issue also impacts Safari.

I am, however, able to check document.visibilityState and receive either: 'visible' or 'hidden'

The Page Visibility API, in the current spec as of this writing (http://www.w3.org/TR/page-visibility/), also specifies the vendor optional: 'prerender' and 'unload'

'prerender' and 'unload' is implied to be correspond to hidden == true.

As such I can work around this by wrapping the document.visibilityState for now.

@alan-knight
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Still true in 1.8 with Safari and Firefox.

Removed Priority-Unassigned label.
Added Priority-Medium, Accepted labels.

@DartBot DartBot added Type-Defect area-core-library SDK core library issues (core, async, ...); use area-vm or area-web for platform specific libraries. library-html labels Jan 23, 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 accepted labels Feb 29, 2016
@matanlurey matanlurey added the closed-obsolete Closed as the reported issue is no longer relevant label Jun 19, 2018
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area-core-library SDK core library issues (core, async, ...); use area-vm or area-web for platform specific libraries. closed-obsolete Closed as the reported issue is no longer relevant 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)
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@kevmoo @matanlurey @efortuna @blois @kasperl @alan-knight @floitschG @DartBot