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Скачать или смотреть How to Use React Native Maps for Conditional Markers Based on User Blood Types

  • vlogize
  • 2025-05-26
  • 1
How to Use React Native Maps for Conditional Markers Based on User Blood Types
React native maps with conditional markersjavascriptfirebasereact nativereact native maps
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Описание к видео How to Use React Native Maps for Conditional Markers Based on User Blood Types

Learn how to display conditional markers on React Native maps based on user blood types. This step-by-step guide helps you enhance your app's functionality.
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This video is based on the question https://stackoverflow.com/q/66398047/ asked by the user 'Billy Ronaldo Chandra' ( https://stackoverflow.com/u/11366810/ ) and on the answer https://stackoverflow.com/a/66422028/ provided by the user 'Vanns35' ( https://stackoverflow.com/u/12085455/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

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Displaying Conditional Markers on React Native Maps Based on User Blood Types

In modern mobile app development, visualizing data effectively is key to providing a seamless user experience. If you're working with React Native and Firebase, you might encounter a scenario where you need to depict user locations on a map based on specific criteria. In this post, we'll address a common requirement: displaying markers on a map for users with certain blood types, specifically when the current user has a blood type of A, but you want to show not just A users, but also AB users.

The Problem at Hand

You have a React Native application using react-native-maps and Firebase to manage users. The goal is to show markers on the map for users whose blood types align with the current user's blood type. Here's a breakdown of the data structure you have:

currentUser: holds the name and blood type of the user currently logged in.

users: an array that contains other users' details (name and blood type, among other attributes).

Your initial approach allowed you to display markers exclusively for users with the same blood type as the current user. However, you would like to enhance this feature by including other compatible blood types. For example, if the currentUser has a blood type of A, you want to also show users with blood type AB.

Solution Overview

To implement this solution, you'll need to modify your filtering logic for the users on the map. The best approach is to create a function that checks if the blood type of each user in the users array meets the compatibility criteria based on the currentUser's blood type. Here’s how you can achieve that.

Step 1: Create the Blood Type Check Function

First, you'll want to define the blood type compatibility rules. Create a function that will take two blood types and return whether they are compatible. Here’s how you can structure that function:

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

Step 2: Update the Filtering Logic

Next, amend your filtering code in the MapView component to utilize this new function. This will allow you to check blood type compatibility when deciding which markers to display:

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

Conclusion

By creating a blood type compatibility check function and incorporating it into the filtering logic of your React Native map component, you can easily display markers for users with corresponding blood types specified in your criteria. This not only enhances the user experience but also makes your application more functional and valuable to its users. Happy coding!

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