Handle clicks, input and form submissions.
✍️ 3 exercises + code challenge in this lessonReact events are written in camelCase and receive a function:
onClick={handleClick} (pass the function, do not call it)onClick={() => remove(id)} to pass argumentsonChange, onSubmit, onMouseEnter, onKeyDowne.preventDefault() to stop default behaviour.Mastering React Events helps you write clean and reliable React code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.
<div id="root"></div>
<script src="https://unpkg.com/react@18.3.1/umd/react.development.js"></script>
<script src="https://unpkg.com/react-dom@18.3.1/umd/react-dom.development.js"></script>
<script src="https://unpkg.com/@babel/standalone@7.25.6/babel.min.js"></script>
<script type="text/babel">
const { useState, useEffect, useRef, useMemo, createContext, useContext } = React;
function App() {
function sayHello(name) {
alert("Hello, " + name + "!");
}
return (
<div>
<button onClick={() => sayHello("Ali")}>Greet Ali</button>{" "}
<button onDoubleClick={() => alert("Double clicked!")}>Double-click me</button>
<p onMouseEnter={(e) => (e.target.style.color = "#149ECA")}>Hover to colour me</p>
</div>
);
}
ReactDOM.createRoot(document.getElementById("root")).render(<App />);
</script>Check what you learned in “React Events”.
React event names are camelCase.
<button ={handle}>Save</button>
How do you pass an argument to an event handler?
Clicking the button should change the <p> text from "Off" to "On". (Use state; the check clicks the button.)
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