How to pass props to {this.props.children} in ReactJS

I'm trying to find the proper way to define some components which could be used in a generic way:

<Parent>
  <Child value="1">
  <Child value="2">
</Parent>

There is a logic going on for rendering between parent and children components of course, you can imagine <select> and <option> as an example of this logic.

This is a dummy implementation for the purpose of the question:

var Parent = React.createClass({
  doSomething: function(value) {
  },
  render: function() {
    return (<div>{this.props.children}</div>);
  }
});

var Child = React.createClass({
  onClick: function() {
    this.props.doSomething(this.props.value); // doSomething is undefined
  },
  render: function() {
    return (<div onClick={this.onClick}></div>);
  }
});

The question is whenever you use {this.props.children} to define a wrapper component, how do you pass down some property to all its children?

Answers

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For a slightly cleaner way to do it, try:

<div>
    {React.cloneElement(this.props.children, { loggedIn: this.state.loggedIn })}
</div>

Edit: To use with multiple individual children (the child must itself be a component) you can do. Tested in 16.8.6

<div>
    {React.cloneElement(this.props.children[0], { loggedIn: true, testPropB: true })}
    {React.cloneElement(this.props.children[1], { loggedIn: true, testPropA: false })}
</div>

Revanth KDec 24, 2022, 05:22 AM

Replies

Nice answer! 👍

Kay 10Dec 26, 2022, 06:18 PM