React Js Format Number Example

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <script src="https://unpkg.com/react@17.0.2/umd/react.development.js"></script>
    <script src="https://unpkg.com/react-dom@17.0.2/umd/react-dom.development.js"></script>
    <script src="https://unpkg.com/@babel/standalone@7.14.7/babel.min.js"></script>
  </head>

<body>
    <div id="app"></div>
    <script type="text/babel">
      const { useState } = React;

function PhoneNumberFormatter() {
        const [phoneNumber, setPhoneNumber] = useState("1234567890");

const formatPhoneNumber = (number) => {
          const cleanNumber = number.replace(/\D/g, "");

if (cleanNumber === "" || cleanNumber.length < 10) {
            return number;
          }

const formattedNumber = cleanNumber.replace(
            /(\d{3})(\d{3})(\d{4})/,
            "$1-$2-$3"
          );

return formattedNumber;
        };

const handleInputChange = (event) => {
          setPhoneNumber(event.target.value);
        };

const formattedPhoneNumber = formatPhoneNumber(phoneNumber);

return (
          <div className="container">
            <h3>React Js Format Number</h3>
            <label>Phone Number:</label>
            <input
              type="text"
              value={phoneNumber}
              onChange={handleInputChange}
            />
            <p>Formatted Number: {formattedPhoneNumber}</p>
          </div>
        );
      }

ReactDOM.render(<PhoneNumberFormatter />, document.getElementById("app"));
    </script>