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问题:

I'm trying to disable the back button on my Cordova app. I'm using AngularJS + Ionic Framework. I found topics about this and tried the code bellow, but it has absolutely no effect. Any idea? Thanks!

index.html

<head>
    <script>
      document.addEventListener("deviceready", onDeviceReady, false);
        function onDeviceReady() {
            document.addEventListener("backbutton", function (e) {
                e.preventDefault();
                console.log("hello");
            }, false );
        }
    </script>
</head>

Note that when I push back button, I have "hello" displayed in my console.

回答1:

Finally found the answer on this Ionic Forum thread:

$ionicPlatform.registerBackButtonAction(function () {
  if (condition) {
    navigator.app.exitApp();
  } else {
    handle back action!
  }
}, 100);

$ionicPlatform.registerBackButtonAction allows to completly overwrite back button behavior. First param is a callback function and the secondone a priority (only the callback with the highest priority gets executed).

回答2:

$ionicPlatform.registerBackButtonAction(function (event) {
    event.preventDefault();
}, 100);

this will prevent back button functionality.

回答3:

To expand upon David D's answer I have included the go back implementation.

Put this in your applications .run function:

$ionicPlatform.registerBackButtonAction(function (event) {
  if ($ionicHistory.currentStateName() === 'someStateName'){
    event.preventDefault();
  } else {
    $ionicHistory.goBack();
  }
}, 100);

This will not work in controllers, it is application wide.

回答4:

Its simple trick prevent go back to single page:

  `.controller('DashCtrl', function($scope,$ionicHistory) {
                $ionicHistory.clearCache();
                $ionicHistory.clearHistory();

       })`

回答5:

The example in the docs shows the event listeners — even the deviceready — being attached after the document onload event has fired.

Using your code:

function onDeviceReady() {
  document.addEventListener("backbutton", function (e) {
    e.preventDefault();
    console.log("hello");
  }, false);
}

document.onload = function () {
  document.addEventListener("deviceready", onDeviceReady, false);
};

回答6:

To prevent App from device back button functionality use,

      $ionicPlatform.registerBackButtonAction(function (event) {
           event.preventDefault();
      }, 100);

If you want to prevent the particular page use,

       $ionicPlatform.registerBackButtonAction(function (event) {
           event.preventDefault();
           if ($location.path() === "/pagename" || $location.path() === "pagename") {
             navigator.app.exitApp();
           } else {
             $ionicHistory.goBack();
           }
        }, 100);

回答7:

To disable hardware back button in Ionic application for controller (or controller of component), you can make the following workaround, but first it is actually not for controller itself, but it combination between controllers and state, in your controller, add your normal code:

  var deRegisterHardBack = $ionicPlatform.registerBackButtonAction(
      function (event) {
        if (youConditionHere) {
          event.preventDefault();
          // do something
        } else {
          $ionicHistory.goBack();
        }
      }, 100);

But in your $stateProvider add disableHardwareBackButton like the following:

$stateProvider
      .state('app.stateB', {
        url: '/page-b/:id',
        template: '<ion-view><ion-nav-title>Sub Page </ion-nav-title>Hello</ion-view>',
        disableHardwareBackButton : true
      });

Inside your module('app').run function:

$ionicPlatform.registerBackButtonAction(function(event){
   if ($state.current.disableHardwareBackButton){
      event.preventDefault();
   } else {
      $ionicHistory.goBack();
   }
}

In this way you get around the issue with "sub section" or "inside controller"

回答8:

For Ionic 3:

// root component
export class MyApp {

  constructor(platform: Platform) {
    platform.ready().then(() => {
      platform.registerBackButtonAction(() => {
        this.customBackButtonHandler();
      }, 100)
    });
  }

  customBackButtonHandler() {
    ...
  }

}