Drag the edges to resize the window.

In Projects, you can keep track of your progress as you go throught the tasks. Check each item as you complete it!

Code Editor
Web Browser
Components and Advanced JSX

Use an Event Listener in a Component

Render functions often contain event listeners. Here's an example of an event listener in a render function:

render() { return ( <div onHover={myFunc}> </div> ); }

Recall that an event handler is a function that gets called in response to an event. In the above example, the event handler is myFunc().

In React, you define event handlers as methods on a component class. Like this:

class MyClass extends React.Component { myFunc() { alert('Stop it. Stop hovering.'); } render() { return ( <div onHover={this.myFunc}> </div>; ); } }

Notice that the component class has two methods: .myFunc() and .render(). .myFunc() is being used as an event handler. .myFunc() will be called any time that a user hovers over the rendered <div></div>.

Report a Bug
If you see a bug or any other issue with this page, please report it here.