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Скачать или смотреть How to Close a Custom Dropdown from Outside the Component in React Native

  • vlogize
  • 2025-03-23
  • 2
How to Close a Custom Dropdown from Outside the Component in React Native
How to close the custom dropdown from outside the dropdown component?javascriptreact native
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Описание к видео How to Close a Custom Dropdown from Outside the Component in React Native

Discover how to manage dropdown states effectively in React Native, allowing users to close them when clicking outside the component.
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This video is based on the question https://stackoverflow.com/q/74204711/ asked by the user 'Nemesis' ( https://stackoverflow.com/u/16381365/ ) and on the answer https://stackoverflow.com/a/74213764/ provided by the user 'SoF' ( https://stackoverflow.com/u/16380621/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: How to close the custom dropdown from outside the dropdown component?

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
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.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
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How to Close a Custom Dropdown from Outside the Component in React Native

When developing mobile applications with React Native, you might encounter scenarios where you want a custom dropdown to open and close based on user interactions. Specifically, you may want the dropdown to close when the user clicks anywhere outside of it. In this guide, we will explore how to implement this feature effectively.

The Problem

Imagine you're using a dropdown component throughout your app. Each time a user clicks on the dropdown, it toggles between open and closed states. While you want the dropdown to be interactive, it's essential for better user experience to automatically close the dropdown when a user clicks outside of it, especially when it's currently open.

This raises a question: How can we achieve this?

The Solution

A highly effective solution to implement this functionality is by utilizing a modal. Using a modal allows us to create an overlay that can be used to detect clicks outside of the dropdown component.

Step-by-Step Implementation

Below is a breakdown of how to implement this solution:

1. Create a Dropdown Component

We will modify our existing dropdown component to incorporate the necessary functionality to measure its position and respond to outside clicks.

Here’s the code:

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

2. Explanation of the Code

References and States:

useRef is used to get a reference to the dropdown component.

isOpen keeps track of whether the dropdown is currently open.

dropdownFrame holds the measurements of the dropdown to position the modal directly below it.

Measuring the Component:

dropdownRef.current.measure() allows us to get the dimensions and position of the dropdown when it is clicked. This is essential to correctly position the dropdown content/modal that appears.

Modal for Outside Clicks:

The Modal is used to display the dropdown content over the rest of the application. It includes a TouchableWithoutFeedback that serves to close the dropdown when a user taps anywhere outside the modal.

3. Testing the Dropdown

Once implemented, you should test the dropdown within your application:

Tap the Dropdown Title to open it.

Click outside of the dropdown area to ensure it closes effectively.

Check if the positioning and appearance of the modal are accurate and user-friendly.

Conclusion

By utilizing a modal in combination with measuring the position of your dropdown component, you can effectively manage how the dropdown opens and closes. Implementing this feature not only enhances user experience but also aligns with common UI practices.

Feel free to adapt and expand upon this component for your specific applications!

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