bootstrap-number-inputs/unremovable-postifx.html at main · mdbootstrap/bootstrap-number-inputs · GitHub

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no" />
    <meta http-equiv="x-ua-compatible" content="ie=edge" />
    <title>Material Design for Bootstrap</title>
    <!-- MDB icon -->
    <link rel="icon" href="img/mdb-favicon.ico" type="image/x-icon" />
    <!-- Font Awesome -->
    <link
      rel="stylesheet"
      href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.0.0/css/all.min.css"
    />
    <!-- Google Fonts Roboto -->
    <link
      rel="stylesheet"
      href="https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;700;900&display=swap"
    />
    <!-- MDB -->
    <link rel="stylesheet" href="css/mdb.min.css" />
  </head>
  <body>
    <!-- Start your project here-->
    <div class="container d-flex justify-content-center mt-5">
    <div class="form-outline" style="width: 22rem;">
      <input id="postfix" value="$" type="text" id="form2" class="form-control" />
      <label class="form-label" for="form2">Enter the amount</label>
  </div>
</div>
    <!-- End your project here-->

    <!-- MDB -->
    <script type="text/javascript" src="js/mdb.min.js"></script>
    <!-- Custom scripts -->
    <script type="text/javascript">
      const input2 = document.getElementById('postfix');

input2.addEventListener('input', (e) => {
  const {
    value
  } = e.target;

  const len = value.length;
  const dolarIndex = value.indexOf('$');
  const number = value.substring(0, len - 1);

  console.log(dolarIndex === -1);

  if (dolarIndex !== len - 1 || dolarIndex === -1 || isNaN(number)) {
    e.target.value = '$';
    e.target.setSelectionRange(dolarIndex, dolarIndex);
  }
});
    </script>
  </body>
</html>