Category: React Answers

Sometimes, we want to get URL parameters in component in React Router v4.

In this article, we’ll look at how to get URL parameters in component in React Router v4.

How to get URL parameters in component in React Router v4?

To get URL parameters in component in React Router v4, we can use the useParams hook.

For instance, we write

<Route path="/:id" children={<Child />} />

to add a Route with the children prop set to Child to render it if we go to /:id.

:id is the placeholder for the id route parameter.

Then in Child, we write

const { id } = useParams();

to call the useParams hook to return an object with the URL parameters.

And we can get the value of the :id with id.

Conclusion

To get URL parameters in component in React Router v4, we can use the useParams hook.

Sometimes, we want to check if a React Router path is active.

In this article, we’ll look at how to check if a React Router path is active.

How to check if a React Router path is active?

To check if a React Router path is active, we can use the matchPath function.

For instance, we write

import { matchPath } from "react-router";

const match = matchPath("/users/123", {
  path: "/users/:id",
  exact: true,
  strict: false,
});

to call matchPath with a URL and an object with the URL properties from the location object.

It returns true if it matches and false otherwise.

Conclusion

To check if a React Router path is active, we can use the matchPath function.

Sometimes, we want to fix the ‘Warning: Failed propType: Invalid prop component supplied to Route‘ error with React Router.

In this article, we’ll look at how to fix the ‘Warning: Failed propType: Invalid prop component supplied to Route‘ error with React Router.

How to fix the ‘Warning: Failed propType: Invalid prop component supplied to Route‘ error with React Router?

To fix the ‘Warning: Failed propType: Invalid prop component supplied to Route‘ error with React Router, we should replace the component prop with the render prop and set that to a function that renders the component we want.

For instance, we write

<Route path="/dashboard" render={(props) => <Dashboard {...props} />} />;

to add a Route component with the render prop set to a function that renders the Dashboard component with the props spread into it.

Conclusion

To fix the ‘Warning: Failed propType: Invalid prop component supplied to Route‘ error with React Router, we should replace the component prop with the render prop and set that to a function that renders the component we want.

Sometimes, we want to fix React Router not loading CSS for nested pages on refresh.

In this article, we’ll look at how to fix React Router not loading CSS for nested pages on refresh.

How to fix React Router not loading CSS for nested pages on refresh?

To fix React Router not loading CSS for nested pages on refresh, we should use absolute paths for the href attribute value of the link tag.

For instance, we write

<link rel="stylesheet" href="/style.css" />

to add a link tag with the absolute path /style.css as the value of href.

Conclusion

To fix React Router not loading CSS for nested pages on refresh, we should use absolute paths for the href attribute value of the link tag.

Sometimes, we want to use onClick event on React Router Link.

In this article, we’ll look at how to use onClick event on React Router Link.

How to use onClick event on React Router Link?

To use onClick event on React Router Link, we can put the states we want pass between routes in the URL parameter.

For instance, we write

<Link to={"/about/" + name}>{name}</Link>;

to add the name URL parameter to the /about route.

Then we can access the name URL parameter value in the component that renders when we go to /about by using

this.props.params.name

Conclusion

To use onClick event on React Router Link, we can put the states we want pass between routes in the URL parameter.