When a user clicks or presses the F5 button on an HTML page, the page refreshes. However, before the refresh occurs, I want to execute a function or display a simple alert.
The user can trigger a refresh by clicking the refresh button, pressing F5, or using Ctrl + R.
This action should be achieved using Angular 2/4.
If you want to trigger the event handler attached to window:beforeunload when refreshing the page, check out this demonstration in StackBlitz. The example showcases how to set it up for the "Home" component using HostListener. You can try refreshing the page by accessing it in full page mode here.
import { Component, HostListener } from '@angular/core';
@Component({
...
})
export class HomeViewComponent {
@HostListener("window:beforeunload", ["$event"]) unloadHandler(event: Event) {
console.log("Processing beforeunload...");
// Do more processing...
event.returnValue = false;
}
...
}
Utilizing browser events is crucial in this scenario.
window.onbeforeunload = (ev) => {
this.executeFunction();
// OR
this.service.performAction().subscribe(() => {
alert('completed task before refreshing');
});
// OR
alert('preparing to refresh');
// finally send the message back to the browser API.
var dialogText = 'Any changes you made may be lost.';
ev.returnValue = dialogText;
return dialogText;
};
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