Discover how to fetch JSON data from Google Maps using Angular 2

Question

Discover how to fetch JSON data from Google Maps using Angular 2

Click here to access JSON data from maps.googleapis.com containing latitude and longitude information.

I am looking to parse this JSON data using Typescript and Angular2.

I have attempted various solutions provided by Google as well as the code snippet recommended by Angular on this page:

private extractData(res: Response) {
    let body = res.json();
    return body.data || {};
}
// This function is triggered when clicking on the map and successfully captures latitude and longitude values
getLongLatClick($event: any) {
    this.lat = $event.coords.lat;
    this.lng = $event.coords.lng;
    this.url = 'https://maps.googleapis.com/maps/api/geocode/json?latlng='+this.lat+','+this.lng+'';

    console.log(this.http.get(this.url).map(this.extractData));

However, upon debugging in Chrome, it appears that the "extractData" method is not being executed. It seems like the googleapis link may not actually be providing JSON data for some reason.

What steps should I take in order to properly read the JSON data?

json angular typescript google-maps-api-3

Answer 1

Answer №1

A recommended approach would be to develop a service that executes an http.get request to fetch the data, similar to the following example:

import { Injectable } from '@angular/core';
import { Headers, Response, Http, RequestOptions } from "@angular/http";

import { Observable } from 'rxjs/Observable';
import 'rxjs/add/operator/catch';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/toPromise';

@Injectable()
export class DataService {

  private gmapsUrl: string = 'http://maps.googleapis.com/maps/api/geocode/json?latlng=52.48278022207823,6.15234375';

  constructor(private http: Http) {};

  getAll() {
    return this.http.get(this.gmapsUrl).map((response: Response) => response.json());
  }

}

With this service in place, you now have a way to retrieve data which can also be easily injected. You can utilize this service in any components of your choice to efficiently consume the data. Here is an example:

import { Component, OnInit, ElementRef } from '@angular/core';
import { DataService } from "path";

@Component ({
  moduleId: module.id,
  selector: 'custom',
  templateUrl: //your metadata,
  styleUrls: //your metadata
})

export class ConsumerComponent implements OnInit {

  gmapsData: any = [];      

  constructor(private dataService: DataService) {}

  ngOnInit(): void {}

  private loadAllUsers() {
    this.dataService.getAll().subscribe(response => {
      console.log(response.results); 
      this.gmapsData = response;
    });

  }

}

This explanation should serve as a solid foundation for your project.

One thing worth noting is ensuring the proper mapping between the response obtained from calling dataService.getAll() within the consumer component and storing it in the property gmapsData. You can refer to console.log(response); for guidance on how to manage this process effectively.

Answer 2

A recommended approach would be to develop a service that executes an http.get request to fetch the data, similar to the following example:

import { Injectable } from '@angular/core';
import { Headers, Response, Http, RequestOptions } from "@angular/http";

import { Observable } from 'rxjs/Observable';
import 'rxjs/add/operator/catch';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/toPromise';

@Injectable()
export class DataService {

  private gmapsUrl: string = 'http://maps.googleapis.com/maps/api/geocode/json?latlng=52.48278022207823,6.15234375';

  constructor(private http: Http) {};

  getAll() {
    return this.http.get(this.gmapsUrl).map((response: Response) => response.json());
  }

}

With this service in place, you now have a way to retrieve data which can also be easily injected. You can utilize this service in any components of your choice to efficiently consume the data. Here is an example:

import { Component, OnInit, ElementRef } from '@angular/core';
import { DataService } from "path";

@Component ({
  moduleId: module.id,
  selector: 'custom',
  templateUrl: //your metadata,
  styleUrls: //your metadata
})

export class ConsumerComponent implements OnInit {

  gmapsData: any = [];      

  constructor(private dataService: DataService) {}

  ngOnInit(): void {}

  private loadAllUsers() {
    this.dataService.getAll().subscribe(response => {
      console.log(response.results); 
      this.gmapsData = response;
    });

  }

}

This explanation should serve as a solid foundation for your project.

One thing worth noting is ensuring the proper mapping between the response obtained from calling dataService.getAll() within the consumer component and storing it in the property gmapsData. You can refer to console.log(response); for guidance on how to manage this process effectively.

Answer 3

Answer №2

You've got the incorrect code in your extractData function. Take a look at the JSON response below:

{
   "results" : [
      {
         "address_components" : [
            {
               "long_name" : "20",
               "short_name" : "20",
               "types" : [ "street_number" ]
            }
    .......

Instead of using data, make sure to use results.

Your function should look like this:

private extractData(res: Response) {
    let body = res.json();
    return body.results || {};
}

This should work correctly (using the static URL for demonstration):

this.http.get('http://maps.googleapis.com/maps/api/geocode/json?latlng=52.48278022207823,6.15234375')
  .map(this.extractData)
  .subscribe(data => console.log(data))

Always remember to subscribe to receive the response. Consider creating a service to handle HTTP calls and mapping data, then calling that service method in your component and subscribing to the results!

It's also helpful to check the network tab to view the response structure and confirm if you're receiving a response.

I hope this explanation is useful! :)

Answer 4

You've got the incorrect code in your extractData function. Take a look at the JSON response below:

{
   "results" : [
      {
         "address_components" : [
            {
               "long_name" : "20",
               "short_name" : "20",
               "types" : [ "street_number" ]
            }
    .......

Instead of using data, make sure to use results.

Your function should look like this:

private extractData(res: Response) {
    let body = res.json();
    return body.results || {};
}

This should work correctly (using the static URL for demonstration):

this.http.get('http://maps.googleapis.com/maps/api/geocode/json?latlng=52.48278022207823,6.15234375')
  .map(this.extractData)
  .subscribe(data => console.log(data))

Always remember to subscribe to receive the response. Consider creating a service to handle HTTP calls and mapping data, then calling that service method in your component and subscribing to the results!

It's also helpful to check the network tab to view the response structure and confirm if you're receiving a response.

I hope this explanation is useful! :)

Discover how to fetch JSON data from Google Maps using Angular 2

Answer №1

Answer №2

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