Stop the controller from reloading when navigating in Angular2/Ionic2

Initially, I developed my app using tabs. When navigating to a page, the view would load for the first time (fetch data from API and display it), and upon returning to the same page, nothing would reload because the controller did not run again.

Recently, I switched to utilizing the Ionic2 side menu starter template, which seems to be set up correctly. However, when I visit the podcast page and play a track, then navigate away, the track continues playing (which is desired). But upon returning to the podcast page, it behaves as a new instance - the track shows as not playing, the progress bar resets, and I can start playing the track again, resulting in two instances playing simultaneously. It appears that the entire controller initializes a new instance each time. This also means that HTTP requests are sent every time I go back to the page, although this may not be an issue if caching is implemented. My primary concern is the inconsistency with the podcast progress/state.

Does anyone have any helpful tips or suggestions on how to address this issue?

Thank you!

Answer №1

In order to prevent certain issues from occurring, I would recommend utilizing a shared service. By integrating this service into the providers array of the App component, we can effectively store relevant information that will be accessible throughout the entire application, essentially creating a singleton.

Let's break this down step by step:

For instance, when you navigate to the podcast page and start playing a track, even if you navigate away, the track continues to play (which is acceptable).

In such scenarios, you can utilize the didLeave() method to halt the track. More details about this method can be found here. It would be beneficial not only to pause the track but also to store relevant data in our shared service about the current playback position and perhaps the track ID being listened to at that time.

However, upon returning to the podcast page, it seems like a completely new instance: the track appears as if it's not playing, the progress bar resets, and you're able to press play again resulting in two simultaneous instances of the same track playing. Essentially, the controller initializes a new instance.

If you revisit the page, you can utilize the willEnter() method to verify if the previously listened track's ID matches the current one. If they match, you can make use of the stored information to update the podcast state (such as setting the progress bar with the stored value, displaying a pause button instead of a play button, etc.).

Furthermore, it appears that HTTP requests are being made each time the page is navigated to (although implementing caching could mitigate this issue, my primary concern lies with the podcast progress/state problem).

You may also reduce the frequency of HTTP requests by referencing the song ID. If the desired podcast is the same as the last one played, you might be able to skip the unnecessary HTTP call.

I apologize if some of these suggestions seem irrelevant to your specific situation; they are simply ideas aimed at assisting you in resolving these challenges.

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