How Can I Pass Custom Props to Child Components in React Router v4?

Extending Router Components with Custom Props in React Router v4

When constructing multi-page React applications using React Router, it's often desirable to pass custom props to child components. By default, child components inherit the this.props.route object, but this may not always contain the intended props.

Issue: Undefined this.props.route for Child Components

The issue can be observed when accessing this.props.route in child components, which returns undefined. This is because the default render method of React Router does not support passing custom props.

Solution: Using the Render Prop

To pass custom props, leverage the render prop of the Route component. This involves inlining the component definition within the render prop:

<code class="javascript"><Route path="/home" render={(props) => <Home test="hi" {...props} />} /></code>

Accessing Custom Props in Child Components

In the child component, access the custom props through this.props:

<code class="javascript">console.log(this.props.test); // Outputs "hi"</code>

Propagating Default Router Props

When using the render prop, it's crucial to propagate default router props (location, history, match, etc.) to the child component. This is achieved by including {...props} in the render prop:

<code class="javascript"><Route path="/home" render={(props) => <Home test="hi" {...props} />} /></code>

Conclusion

By utilizing the render prop, you can easily pass custom props to router components in React Router v4. Remember to propagate default router props to ensure functionality of the child components.

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