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content: hardware back button examples never unsubscribe page-scoped handlers

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
78/100
Issue type
Documentation
Clarity
Clearly specified
Activity status
Active
Tech stack
javascript, react
Domain
documentation

Research direction

Read the hardware back button page and its Angular, Vue, and React examples, then compare the Angular lifecycle guidance and the corresponding page in versioned_docs/version-v8/. Update both versions with page-scoped subscription cleanup, the AppComponent exception, and why ngOnDestroy alone is insufficient. Done when all framework examples explain and demonstrate cleanup consistently.

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Description

content
URL

https://ionicframework.com/docs/developing/hardware-back-button

Issue Description

The Angular examples on this page call platform.backButton.subscribeWithPriority in a constructor and never unsubscribe. That is fine in AppComponent, but on a routed page the handler outlives the page. A popped page that registered later wins presses over the page on screen, and a page still in the stack takes presses made on the page pushed over it, so navigation never pops. Reported in ionic-team/ionic-framework#31366.

Please add a section on page-scoped handlers that:

  • Subscribes in ionViewDidEnter and unsubscribes in ionViewWillLeave, matching the cleanup guidance on the Angular lifecycle page.
  • Notes that handlers registered in AppComponent need no cleanup.
  • Notes that unsubscribing in ngOnDestroy alone leaves the handler active while the page sits in the stack under another page.

The Vue and React tabs have the same gap: useBackButton returns unregister, and the React example adds a listener it never removes. Please update versioned_docs/version-v8/ as well.

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