Currently learning about integrating stripe elements with Angular and I'm intrigued by the use of the onChange method that calls detectChanges() at the end. The onChange function acts as an event listener for the stripe card, checking for errors upon change in input.
onChange({ error }) {
if (error) {
this.error = error.message;
} else {
this.error = null;
}
this.cd.detectChanges();
}
It appears to be related to the Angular Change Detection Strategy.
The default strategy checks the view each time an event is triggered in the component (such as mouse clicks, inputs, XHR requests, etc). This strategy may not perform well in complex applications.
Alternatively, you can use the OnPush strategy. With this approach, the view will only be rerendered when there are changes to @Input properties or when change detection is explicitly triggered using
ChangeDetectorRef.detectChanges();When Stripe (and other 3rd party services) operate outside of Angular's zone, we need to utilize ChangeDetectorRef or NgZone. I found myself curious about how Stripe functions outside of the Angular zone, as there can be various reasons for this behavior. In the case of Stripe, it utilizes a hidden iframe for its API requests instead of relying on async APIs that are intercepted by zone.js, as mentioned in this source.
Angular Zones effectively intercept most asynchronous events and handle change detection in special cases. However, Stripe's use of a hidden iframe bypasses the APIs managed by zone.js.
For further insights into Angular zones, change detection, and the difference between NgZone and ChangeDetectorRef, consider exploring these resources.
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