Скачать или смотреть How to Dynamically Add Values to an Array Object in React with Button Clicks

In this guide, you'll learn how to effectively add values to an array object in React when buttons are clicked. We'll simplify your data structure and improve your functionality using best practices in React.
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This video is based on the question https://stackoverflow.com/q/77934782/ asked by the user 's.kuznetsov' ( https://stackoverflow.com/u/13573444/ ) and on the answer https://stackoverflow.com/a/77934847/ provided by the user 'adsy' ( https://stackoverflow.com/u/1086398/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Adding Values to an Array Object in React Dynamically

Are you looking to add values to an array object key in your React application simply by clicking buttons? If so, you've come to the right place! In this post, we'll tackle the problem of dynamically appending values based on user interaction—specifically when they click buttons.

Let's break down this functionality step-by-step, keeping in mind best practices for managing state in React.

Problem Overview

You have an initial state defined by an array of object entries, each containing a value key, which holds an array, and a current key, determining if that entry is currently selected. When users click on specific buttons, you want the associated values from these buttons to be added to the value array of the currently selected object.

Example Setup

Assuming you have a state structure like this:

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

And buttons defined as:

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

Desired Functionality

If button A is clicked when the first object is current, A should be added to its value array.

If button B is clicked after, it should add B to the same array, resulting in values like AB.

Solution Breakdown

Step 1: Simplifying the Data Structure

To avoid unnecessary complexity, we'll modify the state to keep track of only the values and the current index. This leads to a cleaner and more maintainable code.

Here's how you can define your state:

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

Step 2: Handle Button Clicks

We will create a function that appends the button value to the value array of the current field based on the currentIndex state.

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

Step 3: Updating Button Clicks

Every button will call this function when clicked, passing the button's value directly:

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

Step 4: Displaying the Current Values

Finally, we need to render the value arrays for each field, allowing users to see the accumulated values:

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

Complete Code Example

Putting it all together, here’s how your complete code might look:

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

Conclusion

By refactoring your code to utilize an indexed approach rather than relying heavily on object keys, we have not only simplified the solution but also made it cleaner and easier to maintain. Using button clicks to dynamically add values has never been simpler! This strategy can make managing state in your React application much more straightforward.

Happy coding!