How to enable/disable an Ionic >=2 alert button if there are no input selections

I have an Ionic alert with radio button options, and would like to disable an OK button until the user has made a selection. Very similar to this post, except I want to do it on an action from the alert itself and be able to update the button "enabledness", so my setup would be like the following

import { AlertController } from 'ionic-angular';

export class MessageService {
constructor(private alertCtrl: AlertController) {
}

presentAlert() {
let alert = this.alertCtrl.create();

alert.addInput({
type: 'radio',
label: 'Option 1',
value: 'value1',
checked : false
});

alert.addInput({
type: 'radio',
label: 'Option 2',
value: 'value2',
checked : false
});

alert.addButton('Cancel');
alert.addButton({
text: 'Ok',

handler: data => {

}
});
alert.present();
}
}


I would like the OK button to be initially disabled, but then enabled as soon as the user makes a selection. Since the ion-select also uses the alert, it would be good to be able to use the same thing there.

Is this possible / is there an easy way to do this?

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