Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

JavaScript React by Example Building the Application Changing Guest Name in State

oliverchou
oliverchou
20,886 Points

What does {props.children} mean in this case?

In the video, we can see that the value of <input> and return <span> are altered to {props.children}

Guest.js

  2 import React from 'react';
  1 import PropTypes from 'prop-types';
3   import GuestName from './GuestName';
  1
  2 const Guest = props => (
  3   <li>
  4   ¦ <GuestName
  5   ¦ ¦ isEditting={props.isEditting}
  6   ¦ ¦ handleNameEdits={e => props.setName(e.target.value)}>
  7   ¦ ¦ {props.name}
  8   ¦ </GuestName>
  9   ¦ <label>
 10   ¦ ¦ <input
 11   ¦ ¦ ¦ type="checkbox"
 12   ¦ ¦ ¦ checked={props.isConfirmed}
 13   ¦ ¦ ¦ onChange={props.handleConfirmation}
 14   ¦ ¦ />
 15   ¦ ¦ Confirmed
 16   ¦ </label>
 17     <button onClick={props.handleToggleEditting}>
 18       {props.isEditting? "save": "edit"}
 19     </button>
 20   ¦ <button>remove</button>
 21   </li>
 22 );
 23
 24 Guest.propTypes = {
 25   name: PropTypes.string,
 26   isConfirmed: PropTypes.bool.isRequired,

GuestName.js

1   import React from 'react';
  1 import PropTypes from 'prop-types';
  2
  3 const GuestName = props => {
  4   if (props.isEditting) {
  5   ¦ return (
  6   ¦ ¦ <input
  7   ¦ ¦ ¦ type="text"
  8   ¦ ¦ ¦ value={props.children}                    // here
  9   ¦ ¦ ¦ onChange={props.handleNameEdits}
 10   ¦ ¦ />
 11   ¦ );
 12   }
 13
 14   return <span>{props.children}</span>;                     // and here
 15 };
 16
 17 GuestName.propTypes = {
 18   isEditting: PropTypes.bool.isRequired,
 19   handleNameEdits: PropTypes.func.isRequired
 20 };
 21
 22 export default GuestName;

( ps. sorry about the line numbers though, I was using vim)

I'm wondering what does it mean in this case?

I'm so confused right now :(

oliverchou
oliverchou
20,886 Points

My guess is that it serves as a similar function to the 'super() in OOP classes'. I'm not sure

Steven Parker
Steven Parker
210,438 Points

In vim :point_right: ":set nonu" to turn line numbers off (":set nu" for back on).

oliverchou
oliverchou
20,886 Points

thanks~ that makes sense, I totally forgot to do that

1 Answer

Steven Parker
Steven Parker
210,438 Points

Apparently you're not the only one to find this concept challenging. Take a look at this blog article written by someone who also found this confusing but eventually came to understand it.

oliverchou
oliverchou
20,886 Points

I got it. The article is quite helpful, thanks~