HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>digits only keypress</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 420px; }
    label { display: block; margin-bottom: 6px; font-weight: 600; }
    input { width: 100%; padding: 10px 12px; border: 2px solid #cbd5e1; border-radius: 6px; font-size: 16px; box-sizing: border-box; margin-bottom: 12px; }
    #warn { color: #dc2626; font-size: 14px; min-height: 20px; }
    #hint { color: #64748b; font-size: 14px; margin-top: 10px; }
  </style>
</head>
<body>
  <label for="phone">Phone (digits only)</label>
  <input type="text" id="phone" placeholder="Try typing letters or numbers">
  <p id="warn"></p>
  <p id="hint">Character codes 48–57 are digits 0–9.</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#phone").on("keypress", { min: 48, max: 57 }, function(event) {
      var code = event.which;
      if (code < event.data.min || code > event.data.max) {
        event.preventDefault();
        $("#warn").text("Digits 0-9 only.");
      } else {
        $("#warn").text("");
      }
    });
  </script>
</body>
</html>

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jQuery keypress — digits only filter (Try It)