Скачать или смотреть Resolving TypeError in React Redux: Accessing URL Parameters in AddOrUpdateProduct Component

Learn how to retrieve URL parameters in a React Redux application using custom Higher Order Componnts to prevent common errors like Uncaught TypeError.
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This video is based on the question https://stackoverflow.com/q/71725652/ asked by the user 'İsmail Can Karataş' ( https://stackoverflow.com/u/17546497/ ) and on the answer https://stackoverflow.com/a/71728925/ provided by the user 'Drew Reese' ( https://stackoverflow.com/u/8690857/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Can't Get Parameters from URL with Redux ownProps

When developing applications with React and Redux, particularly when using React Router, one may encounter the error Uncaught TypeError: Cannot read properties of undefined (reading 'params'). This error typically arises when trying to access route parameters in components that are not naturally provided by updated versions of React Router.

In this guide, we’ll dissect this problem and provide a clear solution so that you can successfully access URL parameters, such as productId, within your Redux-connected components.

Understanding the Issue

With the advent of react-router-dom@ 6, there have been significant changes, particularly related to route props. Previously, components could access route props directly, but this is no longer the case. Instead, route parameters can be retrieved using built-in hooks.

To fix this issue, you will need to create a custom Higher Order Component (HOC) that utilizes the useParams hook from React Router. This HOC will allow you to inject the required route parameters as props in your class components.

Step-by-Step Guide to the Solution

Step 1: Create a Custom withRouter Component

To start, we will create a custom HOC named withRouter that makes use of the useParams hook. This hook provides the route parameters needed.

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

Step 2: Update the mapStateToProps Function

Next, modify the mapStateToProps function in your AddOrUpdateProduct component to use the injected params instead of ownProps.match.params.

Here’s how you can do it:

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

Step 3: Connect the Component to Redux

Finally, wrap your AddOrUpdateProduct component with the withRouter HOC and connect it to Redux:

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

Conclusion

By following these steps, you can effectively retrieve URL parameters in your Redux-connected components without running into errors. The key takeaway is understanding how to utilize React Router's hooks to extract parameters and properly implement Higher Order Components.

With this approach, you can seamlessly integrate React Router with Redux and avoid common pitfalls when managing route parameters. Happy coding!