How to useconstructor and bind method. in ReactJS

Approach 1: Binding a click event handler to a button in JSX:

This React class component named “App” includes a button with the label “Click Me!” and a header displaying “GeekforGeeks.” The button is linked to a “handleClick” method, which logs “Button clicked” to the console when the button is clicked.

Example: This example implements the above mentioned approach.

Javascript

import React from "react";
class App extends React.Component {
    constructor(props) {
        super(props);
        this.handleClick = this.handleClick.bind(this);
    }
 
    handleClick() {
        console.log("Button clicked");
    }
 
    render() {
        return (
            <div>
                <h1
                    style={{
                        color: "green",
                        fontSize: "3rem",
                        fontWeight: "bold",
                    }}
                >
                    GeekforGeeks
                </h1>
                <button
                    style={{
                        fontSize: "3rem",
                        fontWeight: "bold",
                        border: "2px solid black",
                    }}
                    onClick={this.handleClick}
                >
                    Click Me!
                </button>
            </div>
        );
    }
}
export default App;

Step to Run Application: Open the terminal and type the following command.

npm start

Output:

How to bind an event handler in JSX callback?

How to bind an event handler in JSX callback ?

ReactJS is a JavaScript library focused on building user interfaces. JSX callbacks in React are used to associate event handlers with elements in JSX code. Event handlers, like those for button clicks or form submissions, are functions triggered by events. In React, event handlers are bound to elements in JSX using the on syntax (e.g., onClick for click events), and a callback function is assigned to handle the event. This callback function is typically defined using bind() or the arrow function.

Syntax: