---
title: Listing location pin markers to google map with stimulus js - clearbnb - Part 18
slug: listing-location-pin-markers-to-google-map-with-stimulus-js-clearbnb-part-18
published_at: 2022-03-21 10:00:31 +0000
updated_at: 2026-03-04 20:13:39 +0000
summary: 
description: In this episode, you'll see how to add pins to a google map using a stimulus.js controller. We embed the lat/lng with data-attributes, then create markers for those listings on a new google map. #rails #rubyonrails
tags: [cjav_dev, web development tutorials, web development for beginners, vim, ruby, rails, javascript, google maps, map markers, map pins, pins, markers, stimulus, stimulus.js, stimulusjs, @cjav_dev]
views: 997
author: CJ Avilla
url: https://www.cjav.dev/videos/listing-location-pin-markers-to-google-map-with-stimulus-js-clearbnb-part-18
youtube_url: https://www.youtube.com/watch?v=lNRLQih8a-c
youtube_id: lNRLQih8a-c
embed_url: https://www.youtube.com/embed/lNRLQih8a-c
thumbnail_url: https://i.ytimg.com/vi/lNRLQih8a-c/hqdefault.jpg
type: video
---

# Listing location pin markers to google map with stimulus js - clearbnb - Part 18

*Published: March 21, 2022*
*Views: 997*

## Watch

[Watch on YouTube](https://www.youtube.com/watch?v=lNRLQih8a-c)

[![Listing location pin markers to google map with stimulus js - clearbnb - Part 18](https://i.ytimg.com/vi/lNRLQih8a-c/hqdefault.jpg)](https://www.youtube.com/watch?v=lNRLQih8a-c)

## Description

In this episode, you'll see how to add pins to a google map using a stimulus.js controller. We embed the lat/lng with data-attributes, then create markers for those listings on a new google map.
#rails #rubyonrails

## Transcript

hey what's up welcome back this is part 18 of clearbnb in this episode we're going to be working on adding a google map to our listings list view and attempting to at least render some pins for where those listings are on the map um and we'll see how far we get i don't know how this is going to go we have this is uh we're going in cold so we're going to try we're going to try and add this we're going to be using stimulus.js today as a reminder in the last episode we built out the pagination so that we can page through our listings and in this episode again we're going to just drop in a map so i think the way that we want to do this is by using stimulus so i'm going to do another stimulus controller so rails g stimulus and we'll call this like listing listing map i don't know what the um if we if we call it listing underscore map that names the file correctly and totally as expected um but we'll see if that if that causes any trouble in the future i think that underscore i think in practice maybe this is going to be like listing dash map if i recall correctly so we'll just say console.log when this is connected and then we'll go to our listing index again and i actually want to wrap up almost the entire thing instead inside of a stimulus controller because what i want to do is i'm actually going to embed the listings lat long inside of the data for each of these sort of lis um and then we'll we'll create the map on sort of a inside of this whole thing so i'll show you what i'm talking about so data controller is listing map and then we are going to have this thing is actually going to be a grid a two column grid so we're going to call this grid grid calls 2 and then call span one so the list is going to be call span one and then we're going to have the map appear over here as a second div so this is going to be like div id or i guess like div data target data listing map target is map and it's going to have the class of call span one also call span one who's spam and who are we calling okay so there should be a div here oops there should be a div here that has uh okay yep so i don't know if you can see that so we've got a div with call span one that's we're going to try to drop in our map and uh the way that we're going to do that is by listening for the same sort of trigger that we did for the address autocomplete so if you recall in our address controller we're using the google maps api on the client already for autocomplete when we create a new listing so if we go to add new listing here we can enter an address like i don't know 123 main street in whatever watertown massachusetts um so we're already we're already using the google maps api it's going to be the same sort of api or the the same javascript client it's just going to be a little bit different api to set up a map and everything so we'll use a similar pattern where we will initialize google and again if we look back at our our application pack we have this little helper this window helper that i stole from chris oliver around waiting for the google maps api to be completely loaded so if we look at application controller here or application html when we're loading up google maps at the very end we specify um which function to call like the callback and that callback is a knit map which is this function on the window when that function is called it emits a custom event that custom event we're listening to on the listing new page down here so we're saying listen for the map loaded event on the window and when that fires call the address um stimulus controllers init google function so we actually want basically this whole data action and we're going to reuse that inside of our listings index but here instead of initializing the autocomplete we're going to initialize a new map so go back to our listing map controller and we want to call that same knit google function so if windowed google then we're going to call this.init google and down here we'll define init google as some stimulus controller function thing that we're going to do so this is the code from the documentation on the google maps site and it works like this so this is our lat long this is supposed to be sort of like where our current location is and we'll ultimately try to derive that from either someone typing in an address that they want to search for where they want to go or based on where they currently are all right the next part of this is that we want to initialize a new instance of the map so we're going to initialize a new instance of the map it has a specific zoom this is like how far in or out of this zoomed in or out of the map you are i want to say the furthest you can zoom in is 11 but i might be wrong zoom 4 is pretty pretty zoomed out so i think you can see like an entire country that way and the way that this google maps constructor function works is it takes in a reference to the map object so we're actually going to use this dot map target and we need to specify our targets as the map and that is how this is wired up as the sort of element that we want to target when we're initializing and mounting that map all right so if we come back over here when we initialize google let's go back to our listings page here oh look at that we've already got a map holy moly okay so we we totally have a map showing up that's great um it's got we have like a little bit of it's too close to our list of listings so we have some styling to do um so let's give this sort of like a uh actually we can use the gap on the on the class here so we can say gap four that's usually pretty good all right that gives us some breathing room and then we do want to drop a pin on the map so let's see how we can do that if we go back over here this is how you create a pin it's called a marker and it takes in a position which is a lat long and we'll look at what this hello world title gives us so that's like if you hover over it notice that it says hello world there so what we want to do now is go through all of our listings and drop each or drop pins for each of those listings on the map somewhere so if we inspect these and take a look we have each listing is an li and we have some data inside of that li there's a couple different ways we could do this if we were using react or another front end framework we might approach it differently by passing some json to the front end or doing some other things like that but what i want to do is i'm actually going to just take the data from the listing and just put it into the html as data dash attributes so let's do that now so let's grab our here in this li and i think we can say data lat is listing dot lat and data long is listing.long this is really going to be just kind of like a basic way to pass along the lat and long for each of these listings and now inside of our well that one doesn't have a lot long but each of these other listings do so now we have a lat and we have a long for fsda fs fdsa so we want to take these lat longs create pins out of them and drop them on the map in order to access all of these data dash attributes we want to iterate over some list of things and so in order to get that list instead of trying to like embed the listing id into the data dash attributes what we're going to do is we're going to add a data listing map target to the ul called listings and that will allow us to add a new target that we can use to access sort of the top level listing and then we'll like sort of iterate over all of those children lis and use them to look at their their their data dash attributes so i'm going to call a new create a new method called add markers and what we're going to do is we're going to um we're going to iterate over all of the children for that listing target so we're going to say something like this dot listings target dot children and that gives us back an html collection so we can say array.from that thing dot four each and then we're going to iterate over all these this is going to give us a listing sort of li and for each of those lis we will create new map markers that we're going to drop onto the map now the lat long in this case is going to be lat is listing.dataset.lat and the long is going to be listingdataset.long we're going to pass in the same map now we don't actually have access to the map at this point so what we're going to do is need to we'll need to pass that down as an argument to the add markers function and then for the title we actually probably want the title to be the uh the actual title of the um of the listing now i'm not sure what's going on here why it sometimes isn't loading okay let's see so uh lat is not number so let's say let's just say like um if listing.dataset.lat like only if we actually have a latitude will we attempt to drop a pin for that otherwise we'll just skip over it um okay so it's not always it doesn't seem like it's always loading set position lat long or lat long literal lat is not a number so let's try um console.log listing.dataset.lat we might need to like parse it or something like um yeah why isn't that always going okay uh okay so let's let's call this um purse float because i think it might be a string i'm not sure if that matters and we'll refresh the page and okay let's see oh look at that there's there's listings okay there there are pins being dropped on the map it seems like there are not okay there's not six but that's because some of these listings don't actually have pins um and then also we're being reset okay cool we're being reset back to australia because that's sort of the search position that we're passing in as the initial position but at least we're able to drop the pins on the map let's also add the title as a data dash attribute so listing.title and then we can just add that here as the title and just say listing.dataset.title and now when we refresh the page let's go to page one and see if we can find our listing so that's preferendus this is fds okay all right um cabin in the woods how come you don't have oh you know what cabin in the woods doesn't have a lat long that's why so if we go to my listings let's try to add a new one and we're going to say like find me on the map in california and test and we'll say i don't know 200 towns in san francisco california whoops 200 towns and san francisco california and then we need to add a nightly price 9 900 and a cleaning fee of 200 and then we will say create listing all right so now we have this lat long 37 and 122 and that should be somewhere in san francisco so if we go back to our listings and let's see i guess it's going to be on oh you know what we need to do is publish it so we need to find that one we just created and edit the details and mark it as published go back to our listings view and okay here we go find me on the map listing 25 if we go to san francisco look at that find me on the map boom okay so this should bring us to townsend street in san francisco okay look at that townsend oh nice townsend street and i don't know fremont bank okay who knows uh but that at least we are on the right track of being able to drop listings onto the map we can see them on the map um and if we what's cool is if we change as we change around the page we can see the new listings that are appearing on the map now one thing that might be really cool is as we drag the map and drop it if we would update the list of listings that's on the left similarly like notice that when i click on page two the map resets to that new location so it's almost like as we're moving around the map we want to update our query string params so that when we make a full page reload with pg here uh it maintains the last position on the map even better would be to do this all sort of like with javascript but i'm actually pretty happy with where this is landing right now because we have listings and they are showing up on a map so yeah i think that's where we will stop today and yeah if this was useful or helpful i would really appreciate a subscribe thumbs up thanks so much for watching and we'll see in the next one [Music]

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