Google maps zoom animation


  • See the Pen Google Maps JS API example by SitePoint ( @SitePoint ) on CodePen. Firstly, we pass our lang variable as the language parameter to instruct Google on which language we want the map to be in. The first thing we need to do is set up a simple front-end framework for building the mapping application. Now that our JSON file is set up, we need to make use of it when initializing our map. Google Maps JS API will still work without a valid key parameter. However, we would be issued with a JavaScript error console warning message. So we should make sure we get ourselves a free API key by following Google's guide. Google Maps is an online mapping service providing up-to-date road maps, business listings, directions, street-level photos and more. If you're interested in building on the functionality already provided in this article, a good starting point would be to look at customizing the icons plotted on the map. This can be done by simply passing a URL as the icon parameter to the new marker object. element. This will allow us to include the Google Maps JS in the correct language for our user. This is especially useful for multilingual (i18n) websites that include the same script.js file across all languages. The complete source code for this article can be found on our GitHub repo. If you have any other improvements or suggestions, please feel free to add them in the comments. If you're interested in taking it further, the next logical step would be to implement InfoWindows, which appear when a marker is clicked. Next, we pass the key parameter with our API key (more on that shortly). Notice how we've used the defer attribute for our script. This tells the browser to download the specified scripts as soon as possible, but to wait until HTML parsing has finished before executing them. It's important to use defer whenever possible, as it will prevent the rendering of the page from halting before it's finished in order to execute JavaScript code— providing a janky loading experience for the user. The eagle-eyed reader may notice how we haven't included Google Maps' JavaScript: this is deliberate, and will be explained shortly! Finally, and most importantly, we specify our callback function using the callback parameter. This tells Google which of our functions it should trigger once the file has been fetched successfully. var js_file = document.createElement('script'); js_file.type = 'text/javascript'; js_file.src = ' + lang; document.getElementsByTagName('head')[0].appendTEEN(js_file); There are lots of tutorials and examples already out there for this, but too often without a focus on the best way of achieving the desired result. They get things done quickly, but without a considered approach or explanation of why certain steps have been taken. tag in the HTML, is to prevent unnecessary code bloat in pages that don't have a map canvas. To load in the file, we create a new. In this article, I'd like to show you how to make the most of the Maps JavaScript API— using it the right way. We should now have a working app that can display a full-screen Google Maps canvas, and plot markers on that map from a JSON file. Once we've got a basic map canvas displayed, the most common next task is to plot markers on the map. One piece of advice I always give in most programming contexts is to separate data from logic whenever possible. In this case this is illustrated by storing your marker details in a separate JSON file. Inside the plotMarkers function, the first things we need to do are set our markers variable to an empty array, and set our bounds variable to an empty Google LatLngBounds object. We'll use the LatLngBounds object to keep track of the area that needs to be viewable on our canvas to fit all of our markers on.

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