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How to prevent a user from adding same character over and over in HTML input box using JavaScript?

Revati S Misra33224-Jan-2023

How to prevent a user from adding same character over and over in HTML input box using JavaScript?

htmljquery javascript html 
Updated on 06-Apr-2023
Revati S Misra

Revati S Misra

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Skilled in SEO, content writing, and digital marketing. Completed several years of working in many organizations including multinational companies. I love to learn new things in life that keep me motivated.

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1 Answers

Aryan Kumar

Aryan Kumar

06-Apr-2023

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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