Enhancing Your Google Autocomplete with Location-Based Logic

Learn how to implement intelligent Google Autocomplete inputs for pickup and drop-off locations in Berlin. This guide will walk you through the process step-by-step!
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This video is based on the question https://stackoverflow.com/q/66815183/ asked by the user 'DragusPatrick' ( https://stackoverflow.com/u/15013750/ ) and on the answer https://stackoverflow.com/a/66823165/ provided by the user 'Professor Abronsius' ( https://stackoverflow.com/u/3603681/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Enhance Your Google Autocomplete with Location-Based Logic

As a backend developer, venturing into frontend challenges can feel daunting, especially when it comes to dynamic user interactions like Google’s Autocomplete feature. In this guide, we’ll address how to create two autocomplete inputs—pickup and drop-off addresses—that adapt based on the area you define: Berlin. We'll ensure that if a user inputs a pickup address in Berlin, the drop-off can be set anywhere globally, while a pickup address outside Berlin restricts the drop-off locations to Berlin only. Let's dive into the solution step-by-step!

Understanding the Problem

You want to implement two input fields using Google Autocomplete API. Specifically, the requirements are:

Pickup Address: If the address is within Berlin, the user can drop off anywhere.

Drop Address: If the pickup address is outside Berlin, the user should only be allowed to pick an address within Berlin.

This means we need some logic to determine whether the entered pickup address lies within the designated area and react accordingly.

Implementing the Solution

Step 1: Define the Area of Interest

First, let’s define the geographical boundary of Berlin using coordinates to create a polygon on the map. This will help us check if a location falls within the Berlin area.

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Initialize the Map

Create a basic map using the Google Maps API. This map will visually indicate the Berlin region where your pickup and drop-off addresses will be validated.

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Setting Up Autocomplete for Inputs

Here’s where the magic happens. We will set up listeners for both the pickup and drop-off inputs using google.maps.places.Autocomplete. This will allow us to check whether the entered locations are valid.

[[See Video to Reveal this Text or Code Snippet]]

Step 4: Validating Addresses and Indicating Results

Now, let's create a function to validate and indicate the result of the address checks. Depending on the pickup input, we’ll either allow global address inputs or restrict them to Berlin.

[[See Video to Reveal this Text or Code Snippet]]

Final Thoughts

With this setup, you improve the user experience by dynamically validating location data based on their inputs. This simple yet effective enhancement allows users to interact more intuitively with your application.

Feel free to adapt and modify the provided code to fit your specific needs. As you grow more comfortable with frontend development, building visually engaging maps and interactive features will become second nature.

Happy coding!

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