Retrieve information from Firebase outside of the .on() method

As a newcomer to Typescript, I am struggling to understand how to access the variables latitude1 and latitude2 outside of the this.ref.on('value', (snapshot) function in order to add their values to the locations array. Can anyone provide some guidance on this? Thank you in advance!

this.map = new google.maps.Map(this.mapElement.nativeElement, mapOptions);

  this.ref.on('value', (snapshot) => {
    //console.log(firebaseToArray(snapshot)[0].latitude);
  var latitude1 = firebaseToArray(snapshot)[0].latitude;
  var latitude2 = firebaseToArray(snapshot)[1].latitude;

});


  var locations = [
    ['3/4', latitude1, 2.1743558],
    ['1/6', latitude2, 2.1843558]
  ];

Answer №1

Perhaps it could be done like this

this.mapInstance = new google.maps.Map(this.mapElement.nativeElement, mapOptions);

let points

this.ref.on('value', (snapshot) => {
    let latitude1 = firebaseToArray(snapshot)[0].latitude;
    let latitude2 = firebaseToArray(snapshot)[1].latitude;

    points = [
        ['3/4', latitude1, 2.1743558],
        ['1/6', latitude2, 2.1843558]
    ];
});

// use points here

However, the approach may vary based on the context. The variable points is only accessible after the asynchronous event (this.ref.on). Thus, the structure of the remaining code needs to be carefully considered.

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