Q:

React event delegation from parent to child

I have a Gatsby Link element inside of an <li> and I want the Link element to be triggered if the <li> is clicked with cursor or hit with the enter key.
export default class Search extends Component {
    ...Constructor...
    render() {
        ...DOM elements...
        <input type="text" value={this.state.query} onChange={this.search} placeholder={'Search'} />
        {this.state.results.map((page, index) => (
            <li tabIndex={index} key={page.id} >
               <Link to={"/" + page.path}>{page.title}</Link>
            </li>
        ))}
        ...DOM elements...
    }
    ...More functions...
}

The above code is inside of a render block, which is inside of a class which extends Component.
I've tried adding an onClickHandler to the <li>, but don't know of any object I can pass to it which contains a reference to its child...
The main reason I need the event delegation to the child is because the tabIndex (which receives focus from the input element above it) only works on the <li>, so once the <li> has focus, I want the user to be able to hit enter and have that event propogate to the child <Link> element (which is a special link element using Gatsby's internal routing).

A:

You can pass the current page.path as well as the event directly to your handler, onKeyPress={e => this.goTo(e, page.path)}.
Example.
import { navigate } from "gatsby"

export default class Search extends Component {
  ... redacted for brevity ...

  goTo = (e, path) => {
    if (e.Key === "Enter") {
      navigate(`/${path}`);
    }
  };

  render() {
    ... redacted for brevity ...
    {
      this.state.results.map((page, index) => (
        <li tabIndex={index} key={page.id} onKeyPress={e => this.goTo(e, page.path)}>
          <Link to={"/" + page.path}>{page.title}</Link>
        </li>
      ));
    }
    ... redacted for brevity ...
  }
}

