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Posted to issues@cordova.apache.org by "Cedric Reichenbach (JIRA)" <ji...@apache.org> on 2018/03/03 18:47:00 UTC
[jira] [Updated] (CB-13947) Back button behavior doesn't revert to
default when removing listeners
[ https://issues.apache.org/jira/browse/CB-13947?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Cedric Reichenbach updated CB-13947:
------------------------------------
Description:
When adding a `backbutton` event listener to `document`, Cordova disables default back button behavior (which is usually closing the app).
Later, when removing the last event listener, it should re-enable default behavior, but does not.
h2. Technical details
Internally, cordova seems to use a channel to handle document event listener registrations, which should update the override state on every listener addition/removal: [https://github.com/apache/cordova-android/blob/eddad666ff60129bf716cee61c24d3d65741640f/bin/templates/project/assets/www/cordova.js#L1664]
However, debugging indicates that `onHasSubscribersChange` is only triggered once, when adding a listener for the first time, but never on removal.
was:
When adding a `backbutton` event listener to `document`, Cordova disables default back button behavior (which is usually closing the app).
Later, when removing the last event listener, it should re-enable default behavior, but does not.
## Technical background
Internally, cordova seems to use a channel to handle document event listener registrations, which should update the override state on every listener addition/removal: [https://github.com/apache/cordova-android/blob/eddad666ff60129bf716cee61c24d3d65741640f/bin/templates/project/assets/www/cordova.js#L1664]
However, debugging indicates that `onHasSubscribersChange` is only triggered once, when adding a listener for the first time, but never on removal.
> Back button behavior doesn't revert to default when removing listeners
> ----------------------------------------------------------------------
>
> Key: CB-13947
> URL: https://issues.apache.org/jira/browse/CB-13947
> Project: Apache Cordova
> Issue Type: Bug
> Components: cordova-android
> Affects Versions: cordova-android-7.0.0
> Reporter: Cedric Reichenbach
> Assignee: Joe Bowser
> Priority: Major
>
> When adding a `backbutton` event listener to `document`, Cordova disables default back button behavior (which is usually closing the app).
> Later, when removing the last event listener, it should re-enable default behavior, but does not.
> h2. Technical details
> Internally, cordova seems to use a channel to handle document event listener registrations, which should update the override state on every listener addition/removal: [https://github.com/apache/cordova-android/blob/eddad666ff60129bf716cee61c24d3d65741640f/bin/templates/project/assets/www/cordova.js#L1664]
> However, debugging indicates that `onHasSubscribersChange` is only triggered once, when adding a listener for the first time, but never on removal.
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