Which of the following code will correctly handle an event inside a function component? JavaScript function App() { const handleClick = () => { console.log("Button clicked!"); }; return <button onClick={handleClick}>Click Me</button>; }

this.handleClick = handleClick.bind(this) should be added inside the function

handleClick() should be used in the return statement

handleClick should be passed as this.handleClick

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Event Handling in React

Test your understanding of event handling in React with this quiz, exploring topics like handling events, binding functions, and React's synthetic events!

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Question 1

Which of the following is true about handling events in React?

You use HTML event names like onclick in JSX
React uses addEventListener to bind events
React uses camelCase for event handler names
Event handlers in React are written in JavaScript only

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Question 2

In React, how do you pass an argument to an event handler?

Using an anonymous function
By using an arrow function in JSX
Using the bind() method inside the render function
By passing arguments directly to the event handler

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Question 3

What is the purpose of synthetic events in React?

To enhance event handling speed
To add custom events to the DOM
To normalize browser-specific event behavior
To improve the performance of JavaScript code

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Question 4

How do you bind an event handler to a specific context in React?

By using this.handleEvent()
By using bind() inside the constructor
By defining the handler as an arrow function
By passing the event handler as a prop

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Question 5

In the code snippet below, how can you pass an argument to the handleClick function?

JavaScript

function MyButton() {
    const handleClick = (name) => {
        alert(name);
    };
    return <button onClick={handleClick}>Click Me</button>;
}

onClick={handleClick('John')}
onClick={() => handleClick('John')}
onClick={handleClick, 'John'}
onClick={handleClick}

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Question 6

What will be the output of the following code?

JavaScript

class App extends React.Component {
    handleClick = (event, message) => {
        console.log(message);
    };

    render() {
        return (
            <button onClick={(e) => this.handleClick(e, "Hello World")}>
                Click Me
            </button>
        );
    }
}

undefined
Hello World
e
null

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Question 7

What is the correct way to bind this to the handleClick method inside the constructor?

JavaScript

class App extends React.Component {
    constructor() {
        super();
        // Complete the binding statement here
    }

    handleClick() {
        console.log("Button clicked!");
    }

    render() {
        return <button onClick={this.handleClick}>Click Me</button>;
    }
}

this.handleClick = handleClick.bind(this)
this.handleClick = this.handleClick()
this.handleClick = this.handleClick.bind(this)
this.handleClick = handleClick

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Question 8

Which of the following code will correctly handle an event inside a function component?

JavaScript

function App() {
    const handleClick = () => {
        console.log("Button clicked!");
    };

    return <button onClick={handleClick}>Click Me</button>;
}

The code is correct as it is
this.handleClick = handleClick.bind(this) should be added inside the function
handleClick() should be used in the return statement
handleClick should be passed as this.handleClick

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Question 9

Which event handler is fired when a key is pressed in React?

onKeyPress
onKeyDown
onKeyUp
onFocus

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Question 10

Which of the following React event handlers is used to handle mouse click events?

onClick
onMouseDown
onMouseUp
onFocus

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ReactJS

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