In Angular 2, the geological coordinates are not saved as variables. Currently, I am attempting to showcase the latitude and longitude values on an HTML page

let lat;
let lng;
getLocation() {
  if (navigator.geolocation) {
      navigator.geolocation.getCurrentPosition(this.showPosition);
  } else { 
      alert("Geolocation is not supported by this browser.");
  }
}
showPosition(position) {
console.log("Latitude: " + position.coords.latitude + 
"Longitude: " + position.coords.longitude);
  this.lat = position.coords.latitude;
  this.lng =  position.coords.longitude;
  console.log(this.lat);
}

I am attempting to retrieve the user's current location upon application launch using HTML5 geolocation functionality. Surprisingly, it works perfectly in JavaScript but encounters issues in Angular 2, which utilizes TypeScript.

angulartypescript

Answer №1

To achieve that goal, you must meet two requirements

  1. Firstly, ensure that you add "dom" in the "lib" section of your tsconfig.json file. This allows the TypeScript compiler to access features related to dom and bom such as 

    "navigator", "console", "window", "event", "document"
    , etc.

    {
  "compileOnSave": false,
  "compilerOptions": {
    "outDir": "./dist/out-tsc",
    "sourceMap": true,
    "declaration": false,
    "moduleResolution": "node",
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "target": "es5",
    "typeRoots": [
      "node_modules/@types"
    ],
    "lib": [
      "es2017",
      "dom"
    ]
  }
}

  2. Secondly, utilize Fat Arrow expressions instead of anonymous functions. Regular functions cannot access the 'this' keyword directly. In an anonymous function, 'this' refers to the function itself. The introduction of lambda expressions in JavaScript resolved this issue.

    lat: any;
lng: any;

ngOnInit() {
  this.getLocation();
}

getLocation() {
  if (navigator.geolocation) {
    navigator.geolocation.getCurrentPosition(position => {
      this.showPosition(position);
    });
  } else {
    alert("Geolocation is not supported by this browser.");
  }
}

showPosition(position) {
  console.log(
    "Latitude: " +
      position.coords.latitude +
      "Longitude: " +
      position.coords.longitude
  );
  this.lat = position.coords.latitude;
  this.lng = position.coords.longitude;
  console.log(this.lat);
}

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