Today I Learned

A Hashrocket project

Dynamically Add Props To A Child Component

If your component has an element nested in it, then it will receive a children prop. There are a number of things you can do beyond simply including the children as part of the rendered output of the component. One thing you can do is put additional props on the child.

const ParentWithClick = ({ children }) => {
  return (
    <children.type
      {...children.props}
      onClick={() => alert("You clicked me!")}
    />
  );
};

This ParentWithClick component will reconstitute its child component with its given props and a new onClick prop.

Here is how it can be used:

const App = () => {
  return (
    <ParentWithClick>
      <span>Hello!</span>
    </ParentWithClick>
  );
};

Click on Hello! and you’ll see the alert.

Minor caveat: multiple children and a string child will need to be handled differently.

See a live example here.