Can't resolve all parameters for Storage: (?)

Question

I am getting values from a modal and I want to store and get it using local storage in ionic2 angular2 project. My code is given below. It gives following error:

Answer 1

You need to move the code where you are accessing the values from a resolved promise into the .then() of that promise. Since, it is async operation, by the time you use it, it might not be available.

E.g. this could work:

presentModal() {
    this.storage.get('distUnit').then((val) => {
        console.log('Your distUnit is', val);
        this.DistanceUnit = val;
        this.storage.get('SetRadious').then((val) => {
            console.log('Your SetRadious is', val);
            this.selectedRadious = val;

            this.modalCreator();
        })
        .catch(err=>{
            console.log('Your SetRadious dont exist: ' + JSON.stringify(err));
            this.selectedRadious = 500;
            this.modalCreator();
        });
    })
    .catch(err=>{
        console.log('Your distUnit dont exist: ' + JSON.stringify(err));
        this.DistanceUnit = 'Meters';

        this.storage.get('SetRadious').then((val) => {
            console.log('Your SetRadious is', val);
            this.selectedRadious = val;

            this.modalCreator();
        })
        .catch(err=>{
            console.log('Your SetRadious dont exist: ' + JSON.stringify(err));
            this.selectedRadious = 500;
            this.modalCreator();
        });
    });
}

modalCreator(){
    let obj = {selectedRadious: this.selectedRadious, DistanceUnit: this.DistanceUnit};
    let myModal = this.modalCtrl.create(SettingModalPage, obj);

    myModal.onDidDismiss(data => {
        console.log('modal value: '+data.DistanceUnit)
        this.DistanceUnit = data.DistanceUnit;
        this.selectedRadious = data.selectedRadious;

        this.storage.set('distUnit', this.DistanceUnit);
        this.storage.set('SetRadious', this.selectedRadious);
    });
    myModal.present();
}

If you read the code carefully, you will get to know that I have handled all the cases for getting both the parameters and if one of them fails. Check it out and let me know.