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home / developersection / forums / how to prevent a user from adding same character over and over in html input box using javascript?
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How to prevent a user from adding same character over and over in HTML input box using JavaScript?

Revati S Misra 707 24 Jan 2023

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

html jqueryjavascripthtml
Updated 06 Apr 2023
Revati S Misra
Revati S Misra

Student

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
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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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