Ionic confirmation alert: await click on alert before continuing

Question

I have a function that runs some arbitrary code, called calculate(). I have an if condition and if it is true I present an ionic confirm alert.

I can get the confirm alert to popup, however, I am trying to use async/await to wait for a response in the confirmation, but my understanding of async/await must be wrong. Here is basically what I am doing:

import { AlertController } from '@ionic/angular';

export class Calculator {
  private cancelResults:boolean = false;

  constructor(private alertController:AlertController) {}

  async calculate() {
    // If my condition is true.
    if (true) {
      // show the user a confirm alert.
      await this.warn();

      // break out of function since they hit cancel.
      if (this.cancelResults) return;
    }

    // The user hit Okay, continue with this function.
  }

  async warn() {
    const alert = await this.alertController.create({
      header: 'confirm',
      message: 'my message',
      buttons: [
        {
          text: 'Cancel',
          role: 'cancel',
          handler: (blah) => {
            console.log('they hit cancel');
            this.cancelResults = true;
            return new Promise(resolve => setTimeout(resolve, 2000));
          }
        }, {
          text: 'Okay',
          handler: () => {
            console.log('they hit ok');
            return new Promise(resolve => setTimeout(resolve, 2000));
          }
        }
      ]
    });

    await alert.present();
  }
}

When the confirmation pops up, the remainder of the calculate() fn continues. I want it to wait for the confirmation response.

Any ideas of how to achieve this?

Answer 1

I figured it out! I needed to first set the await to a constant and then wrap the dialog in a promise rather than return an individual promise per response.

import { AlertController } from '@ionic/angular';

export class Calculator {
  constructor(private alertController:AlertController) {}

  async calculate() {
    // If my condition is true.
    if (true) {
      // show the user a confirm alert.
      const confirmation = await this.warn();
      // break out of function since they hit cancel.
      if (!confirmation) return;
    }

    // The user hit Okay, continue with this function.
  }

  async warn() {
    return new Promise(async (resolve) => {
      const confirm = await this.alertController.create({
        header: 'confirm',
        message: 'my message',
        buttons: [
          {
            text: 'Cancel',
            role: 'cancel',
            handler: () => {
              return resolve(false);
            },
          },
          {
            text: 'OK',
            handler: () => {
              return resolve(true);
            },
          },
        ],
      });

      await confirm.present();
    });
  }
}