Скачать или смотреть How to Reset the Selected Value of a Picker in React Native

Learn how to reset the selected value of a Picker in React Native after form submission, making sure your app behaves as expected when users navigate back to the form.
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This video is based on the question https://stackoverflow.com/q/65774064/ asked by the user 'Furrukh Jamal' ( https://stackoverflow.com/u/7825262/ ) and on the answer https://stackoverflow.com/a/65788537/ provided by the user 'Furrukh Jamal' ( https://stackoverflow.com/u/7825262/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Reset the Selected Value of a Picker in React Native

When building mobile applications with React Native, you may encounter a situation where a user navigates away from a form screen and then returns, only to find that the Picker (a dropdown select input) still displays the previously selected value instead of resetting to its default state. This can be puzzling and may lead to user confusion. Fortunately, there’s a way to easily reset your Picker component upon returning to the screen.

The Problem: Retaining Picker State

In the scenario we’re addressing, there is a custom component using React Native's Picker that allows users to select a job type. When the user submits the form and navigates away, upon returning, the Picker continues to show the last selected value. This creates a less than optimal user experience.

Let’s explore how to address this issue effectively.

The Solution: Listen to Navigation Focus

To reset the Picker value when the screen is focused (i.e., when a user returns to it), we can leverage the React Navigation library. By adding a navigation listener, we can execute a function that resets the Picker whenever the screen becomes active again.

Step-by-Step Implementation

1. Passing the Navigation Prop

In your screen component where the Picker is used, make sure to pass the navigation prop to the SelectList component:

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

This enables the SelectList component to access the navigation object.

2. Updating the SelectList Component

Next, you need to modify the SelectList component to incorporate navigation listeners. Specifically, you will want to reset the Picker value when the component joins the focus:

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

Complete Code Example

Now, let’s put this all together in your SelectList component:

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

Conclusion

By implementing navigation listeners in your React Native application, you can easily reset the selected value of a Picker when the screen reappears. This not only enhances the user experience but also makes your app more intuitive. Remember to unsubscribe from the listener in the componentWillUnmount method to prevent memory leaks. With these strategies, you can improve the overall functionality of your forms. Happy coding!