Angular 10 Leave Browser Beforeunload Event: Warn Users Leaving your App
In this post we will give you information about Angular 10 Leave Browser Beforeunload Event: Warn Users Leaving your App. Hear we will give you detail about Angular 10 Leave Browser Beforeunload Event: Warn Users Leaving your AppAnd how to use it also give you demo for it if it is necessary.
In this article, we’ll learn about the beforeunload
event which is a browser event that’s used to prompt or warn users that they’re about to leave a page or in our case the Angular app.
How to Use beforeunload in JavaScript
You can use the browser’s beforeunload
event in JavaScript to prompt users that they’re going to close the page as follows:
window.addEventListener('beforeunload',(event)=>{event.returnValue='Youhaveunsavedchanges,leaveanyway?';});
How to Use beforeunload
in Angular
In Angular, you can either use the CanDeactivate
route guard to warn users when they are about to leave the current route/page to another page in the app but you need to use the beforeunload
event if you need to watch for the tab closing or the whole app refreshing
Just like plain JavaScript, you’ll need to add a listener to the beforeunload
window event using either JavaScript’ addEventListener
method (Not very recommended) or the Angular APIs such as HostListener
. For example, you can add the following code in a component:
@HostListener('window:beforeunload',['$event'])unloadHandler(event:Event){// Your logic on beforeunload}
You can also bind a method to the window:beforeunload
event of a DOM element inside your page as follows:
<div(window:beforeunload)="onBeforeUnload()"></div>
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