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Home Forums How to prevent a user from adding same character over and over in HTML input box using JavaScript? – MindStick
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1 Answers

Aryan Kumar
Aryan Kumar 06 Apr 2023
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To prevent a user from adding the same character repeatedly in an HTML input box, you can use JavaScript to check for the last entered character and block the user from entering the same character again.

const input = document.getElementById('myInput');
let lastChar = '';
input.addEventListener('input', (event) => {
  const value = event.target.value;
  const currentChar = value.charAt(value.length - 1);
  if (currentChar === lastChar) {
    event.target.value = value.slice(0, value.length - 1);
  }
  lastChar = currentChar;
});
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