The event listener for the hardware back button in $ionicPlatform is being triggered repeatedly

Encountering a glitch with the back button being triggered multiple times.

While I'm in the "messages" $state, everything functions normally when hitting the back button.

var messageIsClosed = true;

$ionicPlatform.onHardwareBackButton(function(event){
  event.stopPropagation();
  handleBackButton();
})

var handleBackButton = function(){
  if(messageIsClosed){
    $state.go("dash");
  } else {
    messageIsClosed = false;
  }
}

However, upon navigating to another $state (e.g., "dash") and then returning to "messages", pressing the back button causes the code above to execute twice. Subsequent returns to "messages" lead to an increasing number of runs - 3 times, then 4, and so on. The back button script adds one execution each time the "messages" view/controller is revisited.

This unexpected behavior has me puzzled.

javascriptangularjscordovaionic-framework

Answer №1

If you find that the onHardwareBackButton function is running multiple times, don't worry, this behavior is expected in your scenario. Each time you visit the messages state, the event registration occurs again.

To prevent this repeated registration of the event, you can utilize the offHardwareBackButton() method to de-register the event when transitioning away from the current state.

Here's an example of how you can handle this:

Define the callback function:

var hardwareBackButtonHandler = function() {
  // Insert your custom back button logic here
  console.log('Hardware back button pressed');
}

Register the back button event like this:

$ionicPlatform.onHardwareBackButton(hardwareBackButtonHandler);

Then, when leaving the current state, unregister the event as follows:

$ionicPlatform.offHardwareBackButton(hardwareBackButtonHandler);

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