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WeAreDevelopers LIVE • Dec 1, 2023

Creating a routing app with Google Maps API from scratch

Germán Álvarez

Transform a simple HTML element into a robust location-aware application. Master the Google Maps API, asynchronous geolocation, and dynamic route rendering from scratch.

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#1 about 2 min

Overview of the three Google Maps routing applications

Three instructional applications demonstrate foundational API capabilities spanning custom visual styling, physical geolocation tracking, and algorithmic route generation.

#2 about 8 min

Setting up the HTML structure and external dependencies

Setting up the foundational HTML document requires injecting third-party scripts, obtaining authentication keys, and explicitly defining container heights.

#3 about 4 min

Rendering the map instance and adding location markers

Generating a basic map view relies on specifying baseline zoom levels and geographical coordinates prior to appending location markers.

#4 about 3 min

Applying custom JSON styles to the map components

Map visual aesthetics are entirely overwritten by supplying a comprehensive JSON configuration object to the internal settings.

#5 about 12 min

Fetching and implementing device geolocation data via API

The internal navigator API prompts browsers to supply local device coordinates which dynamically reposition the digital map center.

#6 about 7 min

Creating the user interface for the routing application

Expanding the foundational HTML introduces interactive input elements and event listeners capable of capturing destination data strings.

#7 about 10 min

Fetching route details using the Directions Service API

The programmatic Directions Service instance accepts precise origin and destination values to algorithmically calculate optimal travel paths.

#8 about 3 min

Drawing the calculated route with the Directions Renderer

Validated navigational data sequences are physically sketched across the map topology using dedicated Directions Renderer instances.

#9 about 10 min

Final code walk-through and audience Q&A session

A summarized architectural review precedes discussions on maintaining API rate limits, masking authentication credentials, and deployment safety.

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