adds adds - 11 months ago 119
Javascript Question

rails 5 turbolinks 5 and google maps how to?

I'm using rails 5 with turbolinks 5 and trying to get google places autocomplete address form to work using the example from google's website found here

I only want to load the javascript and google maps library on this page.

What would be the correct way to get the following javascript to work with rails 5 and turbolinks 5.

// This example displays an address form, using the autocomplete feature
// of the Google Places API to help users fill in the information.

// This example requires the Places library. Include the libraries=places
// parameter when you first load the API. For example:
// <script src="">

var placeSearch, autocomplete;
var componentForm = {
street_number: 'short_name',
route: 'long_name',
locality: 'long_name',
administrative_area_level_1: 'short_name',
country: 'long_name',
postal_code: 'short_name'

function initAutocomplete() {
// Create the autocomplete object, restricting the search to geographical
// location types.
autocomplete = new google.maps.places.Autocomplete(
/** @type {!HTMLInputElement} */(document.getElementById('autocomplete')),
{types: ['geocode']});

// When the user selects an address from the dropdown, populate the address
// fields in the form.
autocomplete.addListener('place_changed', fillInAddress);

function fillInAddress() {
// Get the place details from the autocomplete object.
var place = autocomplete.getPlace();

for (var component in componentForm) {
document.getElementById(component).value = '';
document.getElementById(component).disabled = false;

// Get each component of the address from the place details
// and fill the corresponding field on the form.
for (var i = 0; i < place.address_components.length; i++) {
var addressType = place.address_components[i].types[0];
if (componentForm[addressType]) {
var val = place.address_components[i][componentForm[addressType]];
document.getElementById(addressType).value = val;

// Bias the autocomplete object to the user's geographical location,
// as supplied by the browser's 'navigator.geolocation' object.
function geolocate() {
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(function(position) {
var geolocation = {
lat: position.coords.latitude,
lng: position.coords.longitude
var circle = new google.maps.Circle({
center: geolocation,
radius: position.coords.accuracy

<script src=""
async defer></script>

Answer Source

As per the documentation:

Turbolinks evaluates script elements in a page’s body each time it renders the page. You can use inline body scripts to set up per-page JavaScript state or bootstrap client-side models. To install behavior, or to perform more complex operations when the page changes, avoid script elements and use the turbolinks:load event instead.

But the reason it wasn't working for me was because in layouts/application.html.erb I had:

<%= javascript_include_tag "application", 'data-turbolinks-track' => true %>

when it should be:

<%= javascript_include_tag "application", 'data-turbolinks-track': 'reload' %>