Yesterday I decided to take a look at it to see what I needed to do to fix it up. Old Google Map. My first stop was the Google page about moving to v3 of the API. I also needed to consider whether or not I can use the maps on a commercial site. I decided to check it out again to see how they were doing. My how things change! My next thought was to look for a JavaScript library with a nice API to integrate and handle most of the heavy lifting. It looked pretty powerful, and has a ton of stuff in its API.

I downloaded it 10M? Then I found Leaflet. Exactly what I needed. Small, simple, great documentation , and some really straightforward examples.

The example consists of three files and two images:. The files used in this example are available on GitHub. Note that the version on GitHub might look different that what is outlined here since it has been updated to use more recent versions of the libraries. I recommend using it instead of copying the code on this page. In this example, we are linking to these files stored on a remote server using a CDN.

Another option would be to host these files ourselves, but the advantages of using these CDNs are:. This example uses cdn. You will need to add http: to the ajax.

I have updated the download to fix this. This is the div that is going to be filled in with our map when we create it in our JavaScript. If we do not specify a width, it will adjust the width of the map to the page dynamically.

The last part of this file is the key. This is where we load the JavaScript that does the work of setting up and displaying our map. The first script is a JSON file with our marker information and the second is the code to setup and display our map. Note that the second script has to come after the map div is created so the JavaScript has something to target.

Our initial JavaScript is pretty straightforward. All we are doing here is creating the map and adding a tile layer. The tile images are coming from the OpenStreetMap servers which are good for testing. Note that they say on their site:. Apart from very limited testing purposes, you should not use the tiles supplied by OpenStreetMap.

There are many other options you can set here to tweak the way you want your map displayed. This code adds a layer to the map telling it what set of tiles to display and where to get them. There are several different servers you can use — or you can host your own. Again, Leaflet has many options to use when creating a tileLayer. In our example, the first argument is the URL template so Leaflet knows how to fetch the tiles from the servers properly.

Next is the attribution — this is what shows up in the bottom-right corner of the map. It is important that you add the right info here for proper attribution of the tile set. Finally we have a list of subdomains. Note that this list depends on the tile servers you are using.

This option allows a browser to download from several servers at the same time remember I mentioned this when explaining CDNs above? One of the problems I had with the old Google solution is that it only used one server, so it was slow. This capability makes it much faster. OK, so now we have an interactive map we can drag around and zoom in and out. To read this data and add the markers to our map, I just loop over the array and call the Leaflet function to create markers:.

In our example, we are creating a marker at a specific location, binding a simple popup to it, and adding it to our map. The latitude and longitude and the data to display in the popup the country name and link to Wikipedia are read from our JSON file.

I found a free pin icon over at clker. I played around a bit with different sizes and settled on a height of 24 pixels. I created two versions: the regular version with a height of 24 pixels and a double-sized version for retina displays with a height of 48 pixels. And of course I ran these through ImageOptim to compress them as much as possible. Since we are going to add our own icon, the code we did in the last section needs to be changed a bit.

If you know of a better way, please contact me! The next line declares a var myIcon to hold our new icon. The iconUrl , iconRetinaUrl , and iconSize options are self-explanatory. The iconAnchor is the pixel location in the icon file that corresponds to the specific latitude and longitude.

The popupAnchor specifies where the popup should be located relative to the iconAnchor. One last thing to do with our new icon is actually apply it.

If you end up with too many markers on your map, consider using Leaflet. As always, if you have suggestions on how to improve my code or make things easier, please comment below or feel free to contact me. Project Files: The files used in this example are available on GitHub.

Note that these are useful only for testing. They say on their site:. Update 12 July : Updated example to use Leaflet 0. Hi Andy, First great job, very clean and easy. Works fine. But I like your way with the link and all. Is there a way to have your PopUp display another PopUp when the link is pressed?

I would like to stay on the same page and populate the new PopUp with my weather. Can you give an example of how to use an image like an ocean picture instead of a map as the base background? Thanks ahead Yasmin. See Non-geographical maps. Hi Andy, I am a Python Developer and I have been working on a project to visualize data on the leaflet map via folium and had a question regarding that. Is there a usage limit or performance limit in leaflet as I tried to plot k markers on the map according to the latitude longitude but the html generated did not open in any browser and just showed a blank page whereas when I reduced the markers to 14K I was able to view the map on the browser.

Is there a solution to plot millions of markers on the map?? Also, instead of the entire world map can I use the map for a single country. Will it reduce the load and help me plot millions of markers on my country map? Is there a solution? You could look at clustering to help reduce the number of items displayed and make it more usable for humans. Maybe look at the official Leaflet docs? StackOverflow might be a better place to ask these things since they are beyond the scope of this tutorial.

My recent project has 26, shape files in the database but only plots a few at a time. I of course have a question — in my use case I am trying to dynamically write the markers.

I can define a custom icon and call it directly in the for loop, but then all points have the same icon. Any suggestions? Thanks again! Then you need to map a string from the JSON to the variable somehow. The first thing that comes to mind would be to use a switch statement. Use that to call setIcon on the marker. Worked like a charm, it was the mapping a string to a variable that I was having trouble with before.

Thanks very much! Hi Andy, thanks for nice tutorial! Is there a way to read the markers. You could get more intelligent about it by keeping the old list and then updating only the changes. Hey Andy, great tutorial thanks. Do you know how I could add the markers from a mysql db? Are you sure this is free for commercial use, I tried to use openlayers with OSM, however that seem to hit OSM tiles, same is your case.

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