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Run part of controller code every time a page is navigated to in Ionic?


Run part of controller code every time a page is navigated to in Ionic?

By : Catographer
Date : November 21 2020, 09:01 AM
I hope this helps you . In my controller below, the datapoint seems to only load data from the service the first time this page is opened. The next time it doesn't. At least that's how I have concluded it works. , I found a great answer here:
code :
$scope.$on('$ionicView.beforeEnter', function() {
    //runs every time the page activates
});


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AngularJS $scope values from ng-model lost from page to page in same controller - Ionic Framework

AngularJS $scope values from ng-model lost from page to page in same controller - Ionic Framework


By : user3268395
Date : March 29 2020, 07:55 AM
seems to work fine Controllers are not shared between pages - a new instance is created each time the controller is used. You should not expect to be able to share data from a controller with anything outside the scope of that controller either. If you need to share data between pages or controllers, you should use a service or "value" object to maintain that state. Another option would be passing the data between the pages using the state params:
code :
ui-sref="tab.count({ input: input })"
Execute code whenever page is navigated

Execute code whenever page is navigated


By : 欧峻峰
Date : March 29 2020, 07:55 AM
wish helps you Here's an example, from the doc:
code :
class NavigationListener < Selenium::WebDriver::Support::AbstractEventListener
  def initialize(log)
    @log = log
  end

  def before_navigate_to(url, driver)
    @log.info "navigating to #{url}"
  end

  def after_navigate_to(url, driver)
    @log.info "done navigating to #{url}"
  end
end

listener = NavigationListener.new(logger)
driver = Selenium::WebDriver.for :firefox, :listener => listener
How can I access the main component's functions from a page navigated to in Ionic 2?

How can I access the main component's functions from a page navigated to in Ionic 2?


By : James I
Date : March 29 2020, 07:55 AM
hope this fix your issue With a shared service, you can communicate across the whole application.
Create a service class like
code :
@Injectable() 
class SharedService {
  // use any kind of observable to actively notify about new messages
  someEvent:Subject = new Subject(); 
}
@App({
  ...
  providers: [SharedService]
})
constructor(private sharedService:SharedService) {}

someEventHandler() {
  this.sharedService.someEvent.next('some new value');
}
constructor(sharedService:SharedService) {
  sharedService.someEvent.subscribe(event => {
    if(event == ...) {
      this.doSomething();
    }
  });
}
apiRTC with multi page Ionic 3 app not working when navigated away from page and coming back to call page

apiRTC with multi page Ionic 3 app not working when navigated away from page and coming back to call page


By : sky
Date : March 29 2020, 07:55 AM
it should still fix some issue I recommend You to initialize apirtc and all its components in a provider and call the initializer in app.componen.ts when the app starts and platform is ready, so that you will be able to access to the same client whenever you are navigating between views.
Ionic 4 ionViewDidEnter() didnt triggered after navigated from ion-back-button

Ionic 4 ionViewDidEnter() didnt triggered after navigated from ion-back-button


By : Rajat Sadh
Date : March 29 2020, 07:55 AM
I hope this helps you . After a couple of days, I found the root caused and the solution. Actually the problem is the child component won't refresh/reload... there is a child component from (home.page.ts) inside the which is can be seen inside the DOM elements.
The ionViewWillEnter() is not triggered in the child components (home.page.ts).
code :
async ionViewDidEnter() {
    // This will be called everytime the page become active
    console.log('UpdateHome');
    this.events.publish('UpdateHome');
    ...
}
ionViewWillEnter() {
  this.events.subscribe('UpdateHome', async () => {
      console.log('UpdateHome');
      // Update itself
      let loading = await this.loadctrl.create();
      await loading.present();
      await this.getUser();
      this.menuCtrl.enable(true);
      await loading.dismiss();
  });
}
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