Скачать или смотреть Modifying Redux State in React with Button Clicks

Learn how to effortlessly modify a `Redux` variable state from a `React` component using button clicks, complete with code examples and explanation.
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How to Modify Redux Variable State from React Component with a Button Click

Managing state consistently and efficiently in a React-Redux application can sometimes be tricky, especially when it comes to making changes based on user interactions. One common requirement is modifying a Redux variable state when a button is clicked. In this post, we'll explore how to achieve this with a practical example.

The Problem

Imagine you're working on a React-Redux project and have an id variable with an initial state of 0. You want to change this id state to 1 when one button is clicked (button1), and to 2 when another button is clicked (button2).

Let's take a look at the code you've provided for this task, and see how we can modify it to make clicking those buttons effective.

Understanding the Initial Code Structure

idReducer.js

This file contains the reducer that manages the state of the id. Initially, the reducer looks like this:

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

action.js

The action that is dispatched also doesn’t pass any useful information yet:

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

reducerAll.js

This file combines all your reducers. It includes the processReducer for the id state:

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

ChangeState.js

In the component where you want to change the state via button clicks:

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

The Solution: Modifying Your Redux Code

Step 1: Update the Reducer

You need to modify the processReducer function to handle the new state passed via the action's payload:

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

Step 2: Update the Action Creator

Next, we should update the action creator to accept an id as a payload. This allows the reducer to update the state based on the button clicked:

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

Step 3: Implement Button Click Handlers

Finally, modify the click handlers in your ChangeState component to dispatch the action with the appropriate payload:

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

Summary of Changes

Reducer: Updated the processReducer to return action.payload rather than the current state.

Action Creator: Modified to accept a parameter that can be passed as a payload.

Component: Implemented button handlers that dispatch the action with the correct value.

Conclusion

By following these steps, you can easily change the state of a Redux variable using button clicks in your React components. This pattern is essential in Redux for updating state based on user actions and ensuring your application responds dynamically to user input.

Feel free to experiment with this example and make enhancements as needed!