How to Store Object in State from Input Field in React?

Описание: Learn how to effectively store multiple values from input fields in React state using hooks. This guide offers solutions and examples for handling complex state management.
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This video is based on the question https://stackoverflow.com/q/62217449/ asked by the user 'Akhi21' ( https://stackoverflow.com/u/13315314/ ) and on the answer https://stackoverflow.com/a/62217618/ provided by the user 'Hagai Harari' ( https://stackoverflow.com/u/11360669/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Store Object in State from Input Field in React?

Managing state is a fundamental part of developing React applications. However, many developers encounter challenges when trying to store values from multiple input fields in the state. In this article, we will tackle a common problem: how to store an object in the state while taking input from fields.

The Problem

Imagine you have a form with multiple input fields, like first name (fname) and last name (lname). You want to capture both values and store them in an object in your component's state. However, you've noticed that when you log the state, only the last value you input is being stored.

Here's the issue outlined in simple terms:

Your input fields are capturing the values, but the state is only saving the last one you entered.

You might be handling the event incorrectly, resulting in only one value being retained.

Here’s a simplified version of the code that is causing trouble:

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

The Solution

To effectively store both the first and last names in the state, you need to make a small adjustment to the handleChange function. The solution lies in ensuring that the existing values are retained in your object while you're updating them.

Step-by-Step Breakdown

Spread Operator: Ensure you're using the spread operator correctly to maintain the current state while updating only the specific field that has changed.

Instead of just targeting [name]: value, you should include the existing properties of the object you're updating. This means you need to use ...rows[idx] alongside it.

Updated Code Implementation: Here’s the corrected version of your handleChange function:

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

Key Changes Made

Use of Spread Operator Correctly: By placing { ...rows[idx] } before adding the new value, you ensure that all previous values in that object are preserved.

Dynamic Property Names: Using [name]: value allows you to dynamically update the specific property in your object based on the input's name attribute.

Conclusion

Keeping track of multiple inputs in state can seem tricky, but with the right approach, it becomes manageable. By utilizing the spread operator properly, you can ensure that all field values are accurately stored in the state. Now, when you check your state using console.log(state), you should see both fname and lname stored correctly.

Additional Tips

Always verify the state object after making updates, especially in forms with multiple inputs.

Consider using controlled components to maintain form input state consistently.

Feel free to apply these techniques in your own React projects whenever you need to handle multiple inputs in the state!