Get `children` prop from component

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UPDATE:

For anyone learning and confused on this as I was, this page describes what’s going on — my confusion was between a React component vs React elements https://reactjs.org/docs/rendering-elements.html

ORIGINAL QUESTION:

The page linked below suggests the children prop is passed by default when using FunctionComponent, however it doesn’t seem to work for me. Given the following case, props.children is undefined. I’m still picking up React — what am I doing wrong?

import React, { FunctionComponent } from "react"

type Props = {
  myProp: string
}

const Nav: FunctionComponent<Props> = (props) => {
    console.log(props.myProp, props.children)
    return (
    <main>
        <nav>
        <a href="foo">FOO</a>
        <a href="bar" className="active">BAR</a>
      </nav>
    </main>
  )
}

// This component is rendered from within another component, e.g. `return (<div><Nav /></div>)

My end goal is to access a child attribute somehow. The active class, for example.

source: https://fettblog.eu/typescript-react/children/

Answer

props.children === undefined because you’re rendering

<div>
  <Nav />
</div>

and <Nav /> has no child element in it.

If you change it to something like

<Nav myProp="Hello">
  World!
</Nav>

then console.log(props.myProp, props.children) will print “Hello World!” in the console.



Source: stackoverflow