Ways to enhance the functionality of an input component

Within my React app, I have an input component that triggers an onChange event when connected to another component:

<input type="text" onChange={onChange} />

Now, I am looking to enhance this input component by incorporating a prop from another component that restricts it to only accept alphabets.

Here's a hypothetical implementation:

<input type="text" onKeyPress={ /* return true or false */ } />

However, the challenge lies in combining these two functionalities seamlessly. How can I achieve this?

const InputComponent = ({ onchange, value, alphabetOnly }) => {
  const handleKeyPress = e => {
    let alphabet =
      (e.charCode > 64 && e.charCode < 91) ||
      (e.charCode > 96 && e.charCode < 123);

    if (alphabet) {
      return true;
    }

    console.log("stop user from entering that char");

    return false;
  };

  return (
    <input
      onKeyPress={handleKeyPress}
      onChange={onchange}
      value={value}
    />
  );
};

export default function App() {
  const [value, setValue] = useState("");

  const handleChange = e => setValue(e.target.value);

  return (
    <div className="App">
      <InputComponent onchange={handleChange} value={value} />
    </div>
  );
}

You can find this code on CodeSandbox: https://codesandbox.io/s/distracted-cannon-6ueko

Answer №1

To enhance user experience, consider adding a validation condition within the onChange event instead of relying solely on onKeyPress. Update the state value only if the input consists of alphabetic characters and the alphabetOnly prop is set to true. You can utilize the string.charCodeAt function to verify if the input is an alphabet.

See a working demo here

Code Snippet

const InputComponent = ({ onchange, value, alphabetOnly }) => {
  const handleChange = e => {
    const val = e.target.value;
    if (alphabetOnly) {
      let alphabet =
        (val.charCodeAt(val.length - 1) > 64 &&
          val.charCodeAt(val.length - 1) < 91) ||
        (val.charCodeAt(val.length - 1) > 96 &&
          val.charCodeAt(val.length - 1) < 123) ||
        val === "";
      if (alphabet) {
        onchange(val);
      }
    } else {
      onchange(val);
    }
  };

  return <input onChange={handleChange} value={value} />;
};

export default function App() {
  const [value, setValue] = useState("");

  const handleChange = val => setValue(val);

  return (
    <div className="App">
      <InputComponent alphabetOnly onchange={handleChange} value={value} />
    </div>
  );
}

Answer №2

If you're looking to extract the first character from user input and get the corresponding keyCode, using event.target.value.charCodeAt(0) could be a viable solution.

Remember that users might paste their input as well. In such cases, ensure that only the initial character of the input string is considered by utilizing event.target.value[0].

Answer №3

One way to ensure input validation is by utilizing the 'onChange' function

onChange(event){
  .....
  validateInput(event.charCode)// incorporating your custom input validation logic here
  .....
}

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