Half the time, the Paypal button fails to load on Angular

My page has a recurring issue with a PayPal button that fails to load half the time. I recently experienced this problem when refreshing the page 30 times in a row – it alternated working properly for 9 times, then failed to load for 11 consecutive times, and finally loaded successfully for 10 straight times. This inconsistency is leaving me completely perplexed, as the same issue occurs both in the testing environment and in the live version.

The following error is displayed when the button fails to load:

deposittest.component.ts:224  TypeError: Cannot read properties of undefined (reading 'nativeElement')
    at deposittest.component.ts:218:36
    at _ZoneDelegate.invoke (zone.js:368:26)
    at Object.onInvoke (core.mjs:26321:33)
    at _ZoneDelegate.invoke (zone.js:367:52)
    at Zone.run (zone.js:129:43)
    at zone.js:1257:36
    at _ZoneDelegate.invokeTask (zone.js:402:31)
    at core.mjs:25998:55
    at AsyncStackTaggingZoneSpec.onInvokeTask (core.mjs:25998:36)
    at _ZoneDelegate.invokeTask (zone.js:401:60)

Below is a snippet of the TypeScript file with certain code portions removed:

import { Component, ElementRef, OnInit, ViewChild } from '@angular/core';
import { loadScript, PayPalNamespace } from "@paypal/paypal-js";

@Component({
  selector: 'app-deposittest',
  templateUrl: './deposittest.component.html',
  styleUrls: ['./deposittest.component.css']
})
export class DeposittestComponent implements OnInit {
  // TypeScript code goes here
}

This is a segment from the HTML file associated with the TypeScript code:


// HTML code goes here

Any insights or suggestions regarding this issue would be greatly appreciated. Thank you.

javascriptangulartypescriptpaypalrxjs

Answer №1

A race condition is occurring where you are waiting for the depositState$ to load and render the page, while the renderPaypalButton() method is being called simultaneously. If the state loads quickly, the paypal buttons will render correctly. However, if the state does not load in time, the template will not be available when trying to render the buttons.

To address this issue, you should implement a tap function to check if the state is defined and the template is ready before calling renderPaypalButton().

this.userService.depositInit$()
    .pipe(
      // ...other code
      tap((pageLoaded) => {
       if (pageLoaded) this.renderPaypalButtons()
      })
    )

It is also important to note that placing renderPaypalButtons() in ngAfterViewInit will not make a difference since the entire page depends on the initial *ngIf condition.

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