Скачать или смотреть How to Pass TextInput Values from Child to Parent in React Native?

Learn how to easily pass values from a child component (TextInput) to a parent component in React Native. We’ll walk through an example that makes it simple!
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Passing TextInput Values from Child to Parent in React Native

React Native is a popular framework that allows you to build mobile applications using JavaScript and React. One common requirement when building apps is to pass data from child components to parent components. In this guide, we’ll explore how to effectively pass the value of a TextInput from a child component to its parent component. We will break this down into an easy-to-follow guide, so you can implement it in your own applications.

Problem Overview

Imagine you have a simple app that requires users to input their names. You need a way to capture input from a TextInput in a child component, and then send that input value back to the parent component. Here’s how we can do this effectively.

Component Structure

In our scenario, we have two components:

Parent Component (LandingScreen.js): This is a class-based component that will manage the state and hold the values entered by the user.

Child Component (EmailInput.js): A functional component designed for the TextInput field, which captures the user input.

The relationship is: the child (EmailInput) will send the data to the parent (LandingScreen).

Step-by-Step Solution

Let’s explore the steps to achieve this functionality.

1. Setting Up Your Child Component

The first step is to create the child component, which will contain the TextInput. Here’s how we can set it up:

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

2. Setting Up Your Parent Component

Next, we’ll create the parent component that will utilize the EmailInput child component. Here’s the full setup for the parent part of our application:

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

3. Understanding the Flow

Passing the Function: The key part here is passing the onTextChange function from the parent component to the child (EmailInput component). This function is triggered when the onChangeText event occurs in the TextInput of the child component.

Updating State: When the child component calls this function with the new input text, it updates the parent's state, which holds the value inputted by the user.

4. Styling Your Components

Remember to add styles in your StyleSheet.create method to make your components visually appealing. Here’s a basic example of how to style your TextInput:

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

Feel free to customize the styles according to your app’s design.

Conclusion

Passing data between child and parent components in React Native is a fundamental skill that you will frequently use in your applications. By following the steps above, you will be able to efficiently handle user input and update your parent component's state accordingly. We hope this guide simplifies your development process and encourages you to explore more complex interactions between components.

Now it's your turn! Try implementing this in your React Native applications and see how easy it can be to manage state across your components.