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Learn how to effectively target input values in React forms using onClick events by transforming controlled inputs into uncontrolled ones with the help of useRef.
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Mastering React Forms: How to Capture Input Values on Button Click

When developing applications with React, handling forms and user inputs can sometimes be confusing, especially for beginners. One common issue developers face is how to target and capture the value of an input field only when a button is clicked, rather than on every keystroke. In this guide, we will explore a solution to this problem by transitioning from controlled components to uncontrolled components using the useRef hook.

Understanding the Problem

You may be building a React application where users are required to input a specific value, like a company ID. Typically, you might set up your form input as a controlled component. This means that the input value is determined by the component’s state. It works fine, but the downside is that the component re-renders each time the user types a character, which can lead to performance issues and an unwanted user experience.

Here's a summary of the initial setup:

You are using useState to manage the input's value.

The onChange event updates this state with every keystroke.

You only want to capture the input value when the user clicks the search button.

The Solution: Using useRef for Uncontrolled Inputs

Instead of managing the input value via state, we can switch to using an uncontrolled input. This involves using the useRef hook to access the current value of the input field when the button is clicked, thus avoiding unnecessary re-renders. Here's how to do that:

Step 1: Set Up the Ref

First, you'll need to import the useRef hook from React and create a reference for your input element.

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

Step 2: Modify the Input Element

Replace your current controlled input with an uncontrolled one by removing the value attribute and instead attaching the ref.

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

Step 3: Handle the Button Click

The button's onClick event will trigger a function that can perform any action with the input value. Here, we're simply logging it to the console, but you can easily adapt this to your needs, such as fetching data based on the input.

Complete Code Example

Here’s a revised version of the component incorporating the changes:

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

Conclusion

By using the useRef hook, you can efficiently handle form inputs without unnecessary re-renders. This approach is particularly useful when you need to perform actions based on user input only after a button click, improving both performance and user experience in your React applications.

We hope this guide clarifies how to capture input values in React forms. Happy coding!