Develop Reference

Use Reverse Geocoding in Vue.js

I'm working on a project which track GPS locations and should display in Google map as points. Therefore I use Reverse Geocoding.
I just put below code inside methods: in my Component.
initMap() {
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 8,
center: {lat: 40.731, lng: -73.997}
});
var geocoder = new google.maps.Geocoder;
var infowindow = new google.maps.InfoWindow;
document.getElementById('submit').addEventListener('click', function() {
this.geocodeLatLng(geocoder, map, infowindow);
});
},
geocodeLatLng(geocoder, map, infowindow) {
var input = document.getElementById('latlng').value;
var latlngStr = input.split(',', 2);
var latlng = {lat: parseFloat(latlngStr[0]), lng: parseFloat(latlngStr[1])};
geocoder.geocode({'location': latlng}, function(results, status) {
if (status === 'OK') {
if (results[0]) {
map.setZoom(11);
var marker = new google.maps.Marker({
position: latlng,
map: map
});
infowindow.setContent(results[0].formatted_address);
infowindow.open(map, marker);
} else {
alert('No results found');
}
} else {
alert('Geocoder failed due to: ' + status);
}
});
}
Also I put below code in app.blade.php
<script async defer
src="https://maps.googleapis.com/maps/api/js?key=MY_API_KEY&callback=initMap">
</script>
My problem is when I use callback in parameter the initMap function is not identified. Therefore map is not loading on my view. How should I use it? and also should I need to use axios.get(my_url_here) to do this? I'm stuck in this case. If anyone can consider and help me for this matter would be grateful.

Does Reverse Geocoder Google maps API for Android always return postal code?

I am trying to understand if Google maps Reverse geocoder API will always give me the postal code? If not of the exact latLng but at least the nearest one?
The following JavaScript API works just good & returns Postal Code for all the valid LatLng combinations.
Could someone tell me if it will always return postal code for latLng in Android?
<script>
function initMap() {
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 8,
center: {lat: 40.731, lng: -73.997}
});
var geocoder = new google.maps.Geocoder;
var infowindow = new google.maps.InfoWindow;
document.getElementById('submit').addEventListener('click', function() {
geocodeLatLng(geocoder, map, infowindow);
});
}
function geocodeLatLng(geocoder, map, infowindow) {
var input = document.getElementById('latlng').value;
var latlngStr = input.split(',', 2);
var latlng = {lat: parseFloat(latlngStr[0]), lng: parseFloat(latlngStr[1])};
geocoder.geocode({'location': latlng}, function(results, status) {
if (status === google.maps.GeocoderStatus.OK) {
if (results[1]) {
map.setZoom(11);
var marker = new google.maps.Marker({
position: latlng,
map: map
});
console.log(results[1].address_components);// Accessing Postal code
infowindow.setContent(results[1].formatted_address);
infowindow.open(map, marker);
} else {
window.alert('No results found');
}
} else {
window.alert('Geocoder failed due to: ' + status);
}
});
}
</script>

Google Maps - get address of the current map position

I'm building a website that uses Google Maps. There is a div conatinint the map that can be moved about with the pointer.
I need to get the nearest street address of the currently centred view in the map. How do I do it?
Thanks

According to gmap geocoding, you can find the json array of coordinate by directly pass it to url, for example
location: lat:40.714224, lng:-73.961452

Use Google Map's GeoCoding:
https://developers.google.com/maps/documentation/javascript/examples/geocoding-reverse
function initMap() {
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 8,
center: {lat: 40.731, lng: -73.997}
});
var geocoder = new google.maps.Geocoder;
var infowindow = new google.maps.InfoWindow;
document.getElementById('submit').addEventListener('click', function() {
geocodeLatLng(geocoder, map, infowindow);
});
}
function geocodeLatLng(geocoder, map, infowindow) {
var input = document.getElementById('latlng').value;
var latlngStr = input.split(',', 2);
var latlng = {lat: parseFloat(latlngStr[0]), lng: parseFloat(latlngStr[1])};
geocoder.geocode({'location': latlng}, function(results, status) {
if (status === 'OK') {
if (results[0]) {
map.setZoom(11);
var marker = new google.maps.Marker({
position: latlng,
map: map
});
infowindow.setContent(results[0].formatted_address);
infowindow.open(map, marker);
} else {
window.alert('No results found');
}
} else {
window.alert('Geocoder failed due to: ' + status);
}
});
}

Google Maps Apiv3 - Geocode function to get latitude longtitude not working

I modified the javascript from https://google-developers.appspot.com/maps/documentation/javascript/examples/geocoding-simple to
var geocoder;
var postalArr = [];
postalArr.push(249586);
postalArr.push(266751);
var map;
function initialize(){
var myLatlng = new google.maps.LatLng(1.3667, 103.7500);
var myOptions = {
zoom: 13,
center: myLatlng,
mapTypeId: google.maps.MapTypeId.ROADMAP,
};
if (postalArr) {
for (var i = 0; i < postalArr.length; i++ ) {
codeAddress(postalArr[i]);
}
}
map = new google.maps.Map(document.getElementById('map_canvas'),
myOptions);
}
function codeAddress(postal) {
geocoder.geocode( { 'postal': postal}, function(results, status) {
if (status == google.maps.GeocoderStatus.OK) {
map.setCenter(results[0].geometry.location);
var markerE = new google.maps.Marker({
map: map,
position: results[0].geometry.location,
});
} else {
alert("Geocode was not successful for the following reason: " + status);
}
});
The script goes within the for loop but doesn't run the codeAddress function.
I'm not sure why.

Two things.
(1) need to define geocoder somewhere, I put it in the initialize
function initialize(){
geocoder = new google.maps.Geocoder();
(2) there's no such thing as a postal property to feed the geocoder. Valid requests are for a latlng or an address as explained here.
So at least you must specify a country. I'm not sure what country 249586 is for, in my demo I used two California zip codes, and added ", United States" to the address.
geocoder.geocode( { 'address': postal + ", United States"},

placing multiple markers on google map from array

I'm trying to place multiple markers on a map that are provided from an array. Right now only my initial point loads (NYC).
var geocoder;
var map;
var markersArray = [];
//plot initial point using geocode instead of coordinates (works just fine)
function initialize() {
geocoder = new google.maps.Geocoder();
latlang = geocoder.geocode( { 'address': 'New York City'}, function(results, status) { //use latlang to enter city instead of coordinates
if (status == google.maps.GeocoderStatus.OK) {
map.setCenter(results[0].geometry.location);
marker = new google.maps.Marker({
map: map,
position: results[0].geometry.location
});
markersArray.push(marker);
}
else{
alert("Geocode was not successful for the following reason: " + status);
}
});
var myOptions = {
center: latlang, zoom: 5, mapTypeId: google.maps.MapTypeId.SATELLITE,
navigationControlOptions: {
style: google.maps.NavigationControlStyle.SMALL
}
};
map = new google.maps.Map(document.getElementById("map_canvas"),
myOptions);
}
///////////////////////////////////////////////////////////
//Everything below this line is for attempting to plot the markers
var locationsArray = ['Pittsburgh','Chicago', 'Atlanta'];
function plotMarkers(){
for(var i = 0; i < locationsArray.length; i++){
codeAddresses(locationsArray[i]);
}
}
function codeAddresses(address){
geocoder.geocode( { 'address': address}, function(results, status) {
if (status == google.maps.GeocoderStatus.OK) {
map.setCenter(results[0].geometry.location);
marker = new google.maps.Marker({
map: map,
position: results[0].geometry.location
});
//markersArray.push(marker);
}
else{
alert("Geocode was not successful for the following reason: " + status);
}
});
}

You're not actually calling plotMarkers anywhere in the snippet above! When I added into the end of initialize (after map is defined) it works great! http://jsfiddle.net/T5aKE/
...
map = new google.maps.Map...
plotMarkers();
...