Скачать или смотреть How to Transfer Value from Hook to text Rotate Parameter in React

Struggling to transfer a rotating value in a React component? Learn how to effectively manage state with hooks to control your text rotation based on dynamic values!
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This video is based on the question https://stackoverflow.com/q/64921791/ asked by the user 'Andrew Stark' ( https://stackoverflow.com/u/9439477/ ) and on the answer https://stackoverflow.com/a/64921814/ provided by the user 'Khaled Ahmed' ( https://stackoverflow.com/u/7437349/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Managing Text Rotation in React with Hooks

React has revolutionized how developers build user interfaces by promoting the use of hooks and state management to create dynamic applications. One common challenge when working with SVG components in React is how to pass a value from a hook (like useEffect) to a text rotation parameter. In this post, we'll explore how to effectively manage this process by using React's state hooks properly.

The Problem: Transferring the Rotate Value

In the given code snippet, we want to set a rotation value for an SVG text element based on the width of the text and some optimal width that is determined dynamically:

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

Here, rotateValue is defined as a normal variable that is updated inside the useEffect hook. However, simply updating a variable won't rerender the component with the new value. This is where we face a common pitfall in React: changes to normal variables do not trigger updates to the UI.

The Solution: Utilize State with useState

To properly manage and reflect the rotation value in the UI, we should utilize React's state management system. Here’s how to do that step-by-step:

Step 1: Declare the State

Instead of using a regular variable for rotateValue, let's define it as a state variable using the useState hook:

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

This change will allow React to track the rotateValue and trigger re-renders whenever it changes.

Step 2: Update the State in the useEffect

Next, we need to modify our useEffect function so that it updates the state whenever the necessary calculations are made. Replace the current rotation logic with the following:

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

By using setRotateValue, we now ensure that the rotation value is properly stored in the component’s state.

Step 3: Apply the Rotate Value to Your Component

Finally, update the transform attribute of the SVG <text> element to utilize the rotateValue state:

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

Complete Example

Here’s a complete example that combines all these steps together:

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

Conclusion

By using React's useState hook and managing our components' state effectively, we can easily pass values from hooks to control properties like rotation in an SVG text element. This approach not only solves our problem but also ensures better performance and reliability in our React applications.

Now you can confidently manage dynamic values in your components, making your applications more interactive and responsive to data changes.