Inappbrowser how to figure out the launching app is in the background?

Ionic Framework ionic-v3
1

so i have a app which has a button. on clicking the button a url is opened using the inappbroswer plugin.

my requirement is to change the button text only once the user switch back to my app that launched the url.

i want to do it for better user experience. so want to do it only once the user returns back to app from the launched browser.

2

Does the user have to manually go back from the InAppBrowser to your app? Any implementations automatically close the browser if the user hits a certain URL - then it is easy to also just change a button.